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Showing posts with label decision making. Show all posts
Showing posts with label decision making. Show all posts

Thursday 21 January 2016

Arguing the toss

Nathan Leamon in Cricinfo


Will awarding the toss to the away team even up the playing field and deliver more away Test wins, or is this yet another case of received cricketing wisdom not stacking up with the facts?


You will rarely be criticised for choosing to bat. Batting is the default setting; bowling first is seen as the gamble © Getty Images



On the first morning of the first Test between Pakistan and England in Abu Dhabi, three events came to mind. One current, one recent, one infamous. The first was the conversation between Michael Atherton and both captains at the toss and the unanimity of all concerned. The second, the recent proposal from Ricky Ponting and Michael Holding amongst others, that the toss be done away with in Test cricket and the choice given instead to the away captain. The other was Brisbane 2002, and Nasser Hussain choosing to bowl first on a day almost as hot as the one in Abu Dhabi.

Let's start with the second. The suggestion of awarding the toss to the away captain was made by Ponting as a possible solution to the perceived problem of home teams tailoring wickets to suit their strengths. And the resulting domination of home teams. "It has never been harder to win away from home", we are told repeatedly.

Ironically, the decline of away wins is one of those facts that is assumed to be true without often, it would seem, being checked. In fact, it has never been easier to win on the road. More Tests are won by the away team now than at any time in recent history.


AWAY WINS IN TESTS

Decade     Win%
2010s        28.8
2000s        28.4
1990s        23.1
1980s        21.1
1970s        22.7
1960s        21.5


This is largely down to the decline in the draw. There have been more and more results in Tests and although the proportion of them that have gone the way of the visitors has shifted slightly in favour of the home team, this has resulted in a significant rise in away wins.

That said, there are other factors that suggest the balance of power is shifting slightly towards the home team. The gap between averages at home and averages away is growing, for example. So let's assume for now that the premise is true, and that home teams are increasingly dominant.

Holding and Ponting have suggested giving the toss to the visiting captain to prevent home teams stacking the conditions in their favour. I don't know whether this is a good idea or not. But there are three reasons that we should question whether it would achieve its aims.

Firstly, it assumes groundsmen can reliably bake certain characteristics into a pitch. In practice, pitch preparation seems to be an inexact science. I have stood before Test matches around the world and listened to groundsmen describe how the pitch is going to play, only to watch it do something completely different half an hour later.

It also presupposes that the interests of groundsman and home team are aligned, which is often not the case. In England for example, venues are heavily incentivised to maximise revenues from the Tests they host by ensuring five full days' play. So groundsmen, understandably, often pay less attention to the needs of the visiting circus than to the people who pay their salary for the other 51 weeks of the year.

Secondly, there is a law of unintended consequences in sporting rule changes that can often produce the opposite result to the one intended. If a home captain had control over the pitch, the framers of this law are assuming he would back away from tilting it in his favour. Is it not just as likely that he would go the other way and seek to produce a pitch so favourable that the toss was taken out of the equation? This after all is what MS Dhoni openly sought to do when England and Australia each last toured, produce pitches that turn big from ball one, and so take the toss out of the equation. Equally, you could imagine England or Australia producing genuine green-tops that would be as helpful to the quicks on day four as day one.

But lastly, and most importantly, it assumes that captains are able to use the toss to their advantage. This is not in any way proven. In fact the evidence suggests it just isn't the case.

At the time of writing, 1,048 Tests have been played since January 1990. During that period, the side that won the toss has lost slightly more (377) matches than it has won (374). Winning the toss in the modern era appears to give a side no advantage at all.

It wasn't always so. On uncovered pitches, batting first in almost all instances was a robustly successful strategy. If it rained during the match, the pitch would deteriorate, affecting the side batting second disproportionately. Until 1970, the side batting first in a Test won 36 per cent of matches, and lost 28 per cent.

But in the modern era, the advantage of winning the toss seems to have disappeared. This is, of course, stunningly counterintuitive.
Test cricket is an asymmetric game. One team bats first, then the other. And the two teams' chances of winning are not equal. The team batting first has different requirements for victory to the team batting second, and the pitch changes over the course of the match, affecting the balance of power between bat and ball. Therefore, we would assume, teams that win the toss can choose the best conditions and so gain an advantage. But they don't. How can that possibly be?

Dropped catches and a sickening injury to Simon Jones didn't help Nasser Hussain after he chose to bowl in Brisbane in 2002 © Getty Images





Sometimes, a perfectly reasonable response to current circumstances becomes a habit, then a tradition, then an article of faith that outlives the circumstances that created it. We rarely question what we know to be self-evidently true. And so the bias towards batting first seems to have outlived the circumstances that created it by several decades.

"If you win the toss, nine times out of ten you should bat. On the tenth occasion you should think about bowling and then bat."

That was a very successful strategy to adopt for the first century of Test cricket. And one that is still the default setting for most captains. In the 700 Tests played since January 2000, nearly twice as many captains have batted first than have chosen to bowl. Is it still successful?

In a word, no. In that period, the side batting first has won 36 per cent of those Tests, the side bowling first 39 per cent. The bat-first bias at the toss would seem to be neutral at best, and probably counter-productive.


It is still hard to believe that captains aren't able to use the toss to their advantage. There are venues where the evidence is stark. Some pitches clearly favour the side batting first, some the side batting second. In the 40 Tests played in Lahore, the team batting first has won just three. Adelaide by contrast is a classic bat-first venue. It starts as a batsman's paradise, but by the fifth day can be very tricky to bat on, with considerable turn for the spinners. In the 74 Tests played at the ground the side batting first have won 35, the side batting second 19. Since 1990 averages in the first innings are 44.6, in the second 38.9, the third 30.1 and the fourth 27.1 and, as you would expect, in that period, 25 out of 26 captains have chosen to bat first, gaining a considerable advantage in doing so.

These are not isolated cases. Many pitches have similarly skewed characteristics. Galle and Old Trafford for example, both have similar records to Adelaide. Karachi is as bowl-first friendly as Lahore.



****



Captains' behaviour at the toss seems to be yet another example of received cricketing wisdom not concurring with the evidence. Where what teams do doesn't seem to maximise their chances of winning. Why is this the case?

Well, part of the story involves how our brains handle information. There has been a great deal of research into memory and perception, and the results are both surprising and illuminating when it comes to our decision-making in sport. For a start, our memories don't work as you might expect. They are not akin to a videotape; we don't record a series of events and then play them back as and when they are needed.

The disturbing truth is that our unaided recall is not very good. The human brain encodes less than 10 per cent of what we experience, the rest it simply makes up. Our minds construct a narrative around the coded memories we do have that fills in the gaps with a plausible story. Faced with a huge number of random or near random events (a cricket match, for instance) our brains pattern-spot, even when there is no pattern. Our minds look for those events that they can form into a pattern or story, and that becomes the meaning or lesson that we take away from the match. Even if the vast number of events that occurred didn't fit the pattern, we disproportionately remember the ones that did.

At their best then, our memories seem to work along the lines of Albert Camus's description of fiction, they are the lie through which we tell the truth. What we remember didn't actually happen, what we remember is a story that our brains have fabricated, but one that we hope contains the essential truth of what happened in a way that we can understand and retain.

Our fallible memories are only part of the reason captains and coaches behave the way they do. There is another, far more powerful reason to make the choices they make and one which is harder to argue against. For this we need to go back to Brisbane in 2002, and Nasser Hussain choosing to bowl.


"The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function."
- F. Scott Fitzgerald



It was the first Test of the Ashes, an Australian team were at the peak of their powers and playing at home in 'Fortress Brisbane', the hardest ground in the world to win at as an away team. No visiting team had won in the last 26 Tests played at the 'Gabbattoir'. Hussain won the toss and chose to bowl, Australia were 364-2 by the close of play and went on to win comfortably.

It is no use looking back with hindsight and using that to determine whether a decision was right or wrong. I am sure that if Nasser had known that choosing to bowl first would bring a host of dropped chances, the loss of a bowler to injury and Australia piling up the first-innings runs, he would have chosen to have a look behind door B and strapped his pads on.
But he didn't know, and in evaluating a past decision, we shouldn't know either. We need to remain behind the veil of ignorance, aware of all the potential paths the match could have taken, but ignorant of the one that it did.

One way we can do that is to simulate the match. There are various models that allow us to simulate matches given the playing strengths of the two sides and give probabilities for the outcome. When we do this for that Brisbane Test, we get the following probabilities for England:


Decision                  Win                  Draw                 Lose
Bat First                   4%                     3%                   93%
Bowl First                 4%                   10%                   86%



Every batsman in Australia's top seven for that match finished his career averaging over 45 (three averaged 50-plus), none of the English players did, only two averaged 40. England had a decent bowling attack. Australia had Warne, McGrath and Gillespie with 1,000 wickets between them already.

England were a pretty good side, they'd won four, lost two of their previous 10 matches. But they were hopelessly outgunned, and in alien conditions. Steve Waugh, the Australian captain, was also going to bowl if he had won the toss. If he had done then Australia would almost certainly have won the match as well. Australia were almost certainly going to win regardless of who did what at the toss.

But none of that made any difference. Hussain's decision to bowl first was castigated by the public and press of both countries. Wisden described it as "one of the costliest decisions in Test history". One senior journalist wrote that the decision should prompt the England captain "to summon his faithful hound, light a last cigarette and load a single bullet into the revolver".

For Nasser in Brisbane, read Ricky Ponting at Edgbaston in 2005, another decision to insert the opposition that has never been lived down. Yet, if either of them had batted first and lost, no one would ever remember their decision at the toss. You will rarely if ever be criticised for choosing to bat. Batting is the default setting; bowling first is seen as the gamble. And remember, the side that bats first loses significantly more than it wins.

Test cricket is one of the greatest contests in sport, a brilliant, multi-faceted contest for mind and body. But it is also a game of numbers. If you can tilt the numbers slightly in your favour, get them working for you, not against you, plot a slightly more efficient path to victory, then you are always working slightly downhill rather toiling against the slope.

As I write this, Pakistan are about to go out and bowl for the fourth consecutive day of England's first innings in Abu Dhabi on a pitch that you could land light aircraft on. They have home advantage, have made the orthodox decision, played well, and yet there is only one team that can win the match from here, and it isn't them. If this is what home advantage and winning the toss looks like then they are welcome to it.

It is all but certain that if they had ended up batting second they would now be in a considerably better position. Reverse the first innings as they have happened and Pakistan would now be batting past an exhausted England side and about to put them under the pump for a difficult last three sessions. And in the alternative scenarios where one side or the other got a first innings lead, as we have seen, those work disproportionately in favour of the side batting second.

But, we all do it. We look at a pristine wicket, flat, hard and true, and batting seems the only option. It is written into our cricketing DNA. The evidence may suggest there is a small marginal gain in bowling. But small margins be damned. If the marginal gain erodes your credibility and authority, then that is probably not an exchange you are willing to make. There are tides you can't swim against.

Which brings us back to Alastair Cook and Misbah-ul-Haq, standing in Abu Dhabi in the baking heat. Both are men of considerable character; brave, implacable and preternaturally determined to win. Each has withstood the slings and arrows of captaining their country through some fairly outrageous fortunes. Each is ready to bat first without a second thought. Because while they are certainly brave, they are not stupid. And you would have to be really stupid to make the right decision.
And there of course you have the central problem of much decision-making in cricket. This pitch is slightly different to all the other pitches that there have ever been. And you don't know for certain how it is going to play, or how that will influence the balance of power in the match. There are those who would argue that this is why stats are useless, or at best very limited.

I would agree entirely that stats are never sufficient to make a decision. There is nuance and subtlety to weigh; the brain and eye have access to information that the laptop doesn't. The feel and instincts of coaches and players, the hard-wired learning from decades in the game, contains incredibly valuable information and will always be the mainstay of decision-making that must be flexible and fluid through changing match situations. But if we are honest, we must also accept that the sheer weight and tonnage of what we don't know about how cricket works would sink a battleship. To use stats and nothing else to make decisions would be incredibly foolish, and as far as I am aware no one ever has. But equally, to insist on making decisions on incomplete information, without ever reviewing the effectiveness of those decisions would seem almost equally perverse.

I'm not saying that everyone was wrong in Abu Dhabi. I'm not saying that Misbah should have bowled. The weight of opprobrium heaped on him doesn't bear thinking about. It's the sort of decision that ends captaincies. No, Misbah had only one option and he took it. But maybe, just maybe, one day there will come a time when it isn't such an obvious choice.

Tuesday 30 August 2011

Academic publishers make Murdoch look like a socialist


Academic publishers charge vast fees to access research paid for by us. Down with the knowledge monopoly racketeers
  • College Students Library
    'Though academic libraries have been frantically cutting subscriptions to make ends meet, journals now consume 65% of their budgets.' Photograph: Peter M Fisher/Corbis
     
    Who are the most ruthless capitalists in the western world? Whose monopolistic practices make Walmart look like a corner shop and Rupert Murdoch a socialist? You won't guess the answer in a month of Sundays. While there are plenty of candidates, my vote goes not to the banks, the oil companies or the health insurers, but – wait for it – to academic publishers. Theirs might sound like a fusty and insignificant sector. It is anything but. Of all corporate scams, the racket they run is most urgently in need of referral to the competition authorities. Everyone claims to agree that people should be encouraged to understand science and other academic research. Without current knowledge, we cannot make coherent democratic decisions. But the publishers have slapped a padlock and a "keep out" sign on the gates. You might resent Murdoch's paywall policy, in which he charges £1 for 24 hours of access to the Times and Sunday Times. But at least in that period you can read and download as many articles as you like. Reading a single article published by one of Elsevier's journals will cost you $31.50. Springer charges €34.95, Wiley-Blackwell, $42. Read 10 and you pay 10 times. And the journals retain perpetual copyright. You want to read a letter printed in 1981? That'll be $31.50. Daniel Pudles illo Illustration by Daniel Pudles Of course, you could go into the library (if it still exists). But they too have been hit by cosmic fees. The average cost of an annual subscription to a chemistry journal is $3,792. Some journals cost $10,000 a year or more to stock. The most expensive I've seen, Elsevier's Biochimica et Biophysica Acta, is $20,930. Though academic libraries have been frantically cutting subscriptions to make ends meet, journals now consume 65% of their budgets, which means they have had to reduce the number of books they buy. Journal fees account for a significant component of universities' costs, which are being passed to their students. Murdoch pays his journalists and editors, and his companies generate much of the content they use. But the academic publishers get their articles, their peer reviewing (vetting by other researchers) and even much of their editing for free. The material they publish was commissioned and funded not by them but by us, through government research grants and academic stipends. But to see it, we must pay again, and through the nose. The returns are astronomical: in the past financial year, for example, Elsevier's operating profit margin was 36% (£724m on revenues of £2bn). They result from a stranglehold on the market. Elsevier, Springer and Wiley, who have bought up many of their competitors, now publish 42% of journal articles. More importantly, universities are locked into buying their products. Academic papers are published in only one place, and they have to be read by researchers trying to keep up with their subject. Demand is inelastic and competition non-existent, because different journals can't publish the same material. In many cases the publishers oblige the libraries to buy a large package of journals, whether or not they want them all. Perhaps it's not surprising that one of the biggest crooks ever to have preyed upon the people of this country – Robert Maxwell – made much of his money through academic publishing. The publishers claim that they have to charge these fees as a result of the costs of production and distribution, and that they add value (in Springer's words) because they "develop journal brands and maintain and improve the digital infrastructure which has revolutionised scientific communication in the past 15 years". But an analysis by Deutsche Bank reaches different conclusions. "We believe the publisher adds relatively little value to the publishing process … if the process really were as complex, costly and value-added as the publishers protest that it is, 40% margins wouldn't be available." Far from assisting the dissemination of research, the big publishers impede it, as their long turnaround times can delay the release of findings by a year or more. What we see here is pure rentier capitalism: monopolising a public resource then charging exorbitant fees to use it. Another term for it is economic parasitism. To obtain the knowledge for which we have already paid, we must surrender our feu to the lairds of learning. It's bad enough for academics, it's worse for the laity. I refer readers to peer-reviewed papers, on the principle that claims should be followed to their sources. The readers tell me that they can't afford to judge for themselves whether or not I have represented the research fairly. Independent researchers who try to inform themselves about important scientific issues have to fork out thousands. This is a tax on education, a stifling of the public mind. It appears to contravene the universal declaration of human rights, which says that "everyone has the right freely to … share in scientific advancement and its benefits". Open-access publishing, despite its promise, and some excellent resources such as the Public Library of Science and the physics database arxiv.org, has failed to displace the monopolists. In 1998 the Economist, surveying the opportunities offered by electronic publishing, predicted that "the days of 40% profit margins may soon be as dead as Robert Maxwell". But in 2010 Elsevier's operating profit margins were the same (36%) as they were in 1998. The reason is that the big publishers have rounded up the journals with the highest academic impact factors, in which publication is essential for researchers trying to secure grants and advance their careers. You can start reading open-access journals, but you can't stop reading the closed ones. Government bodies, with a few exceptions, have failed to confront them. The National Institutes of Health in the US oblige anyone taking their grants to put their papers in an open-access archive. But Research Councils UK, whose statement on public access is a masterpiece of meaningless waffle, relies on "the assumption that publishers will maintain the spirit of their current policies". You bet they will. In the short term, governments should refer the academic publishers to their competition watchdogs, and insist that all papers arising from publicly funded research are placed in a free public database. In the longer term, they should work with researchers to cut out the middleman altogether, creating – along the lines proposed by Björn Brembs of Berlin's Freie Universität – a single global archive of academic literature and data. Peer-review would be overseen by an independent body. It could be funded by the library budgets which are currently being diverted into the hands of privateers. The knowledge monopoly is as unwarranted and anachronistic as the corn laws. Let's throw off these parasitic overlords and liberate the research that belongs to us. • A fully referenced version of this article can be found on George Monbiot's website. On Twitter, @georgemonbiot

Tuesday 5 July 2011

INTELLIGENT MAN


Whenever an INTELLIGENT MAN makes an important decision

He closes his eyes Thinks a lot
Listens to his heart. Uses his brain.
Contemplates pros and cons
&


Finally does what his WIFE says