I was quoting the statistics, I wasn't pretenting to be a statisitcian
In defence of Roy Meadow
Lancet, Vol 366, July 2,2005
Richard Horton (editor of Lancet)
Beyound reasonable doubt
Plus Magazine, 2002
Muliple sudden infant deaths--coincidence or beyound coincidence
Paediatric and Perinatal Epidemiology 2004, 18, 320-326
Sir Roy Meadow is a pediatrician who is well known for his research in child abuse. In 1999 two of Sally Clark's baby boys died. The first death was recordered as a natural cot death.
A cot death is also called Sudden Infant Death Syndrome Death (sids). But after her second baby boy died she was tried and convicted of murdering both of her children and given a lifetime sentance.
Roy Meadow testified in her trial and stated that chance of two natural cot deaths was 1 in 73 million suggesting that two natural cot deaths was beyond belief. This estimate came from a study called the "Confidential Inquiry for Stillbirths and Deaths in Infancy" (CESDI). The study gave detailed information about the deaths of all babies in five regions of England between 1993 and 1996. The report of the study estimated that the chance of a cot death was 1 in 1,303. But if the child was from an afluint non-smoking family with the mother aged over 26, then the chance decreased to 1 in 8,543) Since Sally Clark was in the this group, Meadow assume the chance of the first child was a cot death was 1/8,543 and squaring this he obtained the 1 in 73 million estimate for the chance of two cot deaths.
Of cource, soon after the trial it was pointed out that this multiplication assumed independence of the two events which surely would not be the case. In fact Enviornment, biological and genetic factors would suggest a lower probability for the second child. Then it was pointed out that this was a classic case of the Prosecurers Paradox which in the case of DNA fingerprinting has been officially recognized by the courts in England.
To be continued