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Politics : Foreign Affairs Discussion Group -- Ignore unavailable to you. Want to Upgrade?

To: GST who wrote (153915)	12/13/2004 5:48:20 PM
From: TimF	Read Replies (1) \| Respond to of 281500

There are numerous problems with the study. Its samples are small. The figure given by the study is several times higher then the highest from any other source and about 25 times higher then the estimates from the . It effectively blames the US for deaths caused by the murderous actions of terrorists. Even the authors of the study have called it imprecise and said it could be off by a lot. --------- We estimate there were 98,000 extra deaths (95% CI 8000-194 000) during the post-war period. Readers who are accustomed to perusing statistical documents know what the set of numbers in the parentheses means. For the other 99.9 percent of you, I'll spell it out in plain English—which, disturbingly, the study never does. It means that the authors are 95 percent confident that the war-caused deaths totaled some number between 8,000 and 194,000. (The number cited in plain language—98,000—is roughly at the halfway point in this absurdly vast range.) This isn't an estimate. It's a dart board... ...There were other problems. The survey team simply could not visit some of the randomly chosen clusters; the roads were blocked off, in some cases by coalition checkpoints. So the team picked other, more accessible areas that had received similar amounts of damage. But it's unclear how they made this calculation. In any case, the detour destroyed the survey's randomness; the results are inherently tainted. In other cases, the team didn't find enough people in a cluster to interview, so they expanded the survey to an adjoining cluster. Again, at that point, the survey was no longer random, and so the results are suspect. Beth Osborne Daponte, senior research scholar at Yale University's Institution for Social and Policy Studies, put the point diplomatically after reading the Lancet article this morning and discussing it with me in a phone conversation: "It attests to the difficulty of doing this sort of survey work during a war. … No one can come up with any credible estimates yet, at least not through the sorts of methods used here." The study, though, does have a fundamental flaw that has nothing to do with the limits imposed by wartime—and this flaw suggests that, within the study's wide range of possible casualty estimates, the real number tends more toward the lower end of the scale. In order to gauge the risk of death brought on by the war, the researchers first had to measure the risk of death in Iraq before the war. Based on their survey of how many people in the sampled households died before the war, they calculated that the mortality rate in prewar Iraq was 5 deaths per 1,000 people per year. The mortality rate after the war started—not including Fallujah—was 7.9 deaths per 1,000 people per year. In short, the risk of death in Iraq since the war is 58 percent higher (7.9 divided by 5 = 1.58) than it was before the war. But there are two problems with this calculation. First, Daponte (who has studied Iraqi population figures for many years) questions the finding that prewar mortality was 5 deaths per 1,000. According to quite comprehensive data collected by the United Nations, Iraq's mortality rate from 1980-85 was 8.1 per 1,000. From 1985-90, the years leading up to the 1991 Gulf War, the rate declined to 6.8 per 1,000. After '91, the numbers are murkier, but clearly they went up. Whatever they were in 2002, they were almost certainly higher than 5 per 1,000. In other words, the wartime mortality rate—if it is 7.9 per 1,000—probably does not exceed the peacetime rate by as much as the Johns Hopkins team assumes. The second problem with the calculation goes back to the problem cited at the top of this article—the margin of error. Here is the relevant passage from the study: "The risk of death is 1.5-fold (1.1 – 2.3) higher after the invasion." Those mysterious numbers in the parentheses mean the authors are 95 percent confident that the risk of death now is between 1.1 and 2.3 times higher than it was before the invasion—in other words, as little as 10 percent higher or as much as 130 percent higher. Again, the math is too vague to be useful... slate.msn.com Also see chicagoboyz.net techcentralstation.com