R-beta: CI for median in funtion boxplot

Rick White rick at stat.ubc.ca
Sat Apr 4 02:59:07 CEST 1998

I noticed that boxplot computes a 95% CI for the median by using
median +/- 1.58*IQR./sqrt(n)

Where does the 1.58 constant come from?

Rick White
Statistical Consultant
U.B.C. Vancouver
B.C. Canada
rick at stat.ubc.ca

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