Quote:
Originally Posted by Damuri Ajashi
People can look at the anemic sample size and reach the conclusion that the sample size is too small to be able to say that 21::1 is a valid statistic. It might very well be the result of a violent turf war in Chicago or couple of violent drug/gang encounters in LA.

The footnote in the linked article indicates that they took the small sample size into account, and still came up with a range of 10% to 40% for the risk ratio, with a 95% confidence level:
Quote:
Risk ratios can have varying levels of precision, depending on a variety of mathematical factors. In this case, because such shootings are rare from a statistical perspective, a 95 percent confidence interval indicates that black teenagers are at between 10 and 40 times greater risk of being killed by a police officer.

So, while it may not be statistically valid to claim black teens are exactly 21 times as likely to be killed by police as white teens, it is statistically valid to say that black teens are anywhere from 10 to 40 times as likely to be killed by police as white teens.
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