[Rd] Problem with the 'hist' function
Edo Airoldi
eairoldi at Princeton.EDU
Wed Feb 14 23:51:50 CET 2007
Hi, I am using the following R version:
> R version 2.4.1 (2006-12-18)
> Copyright (C) 2006 The R Foundation for Statistical Computing
> ISBN 3-900051-07-0
I believe I found a bug in the 'hist' function, when
'probability=TRUE'. I looked in the archives and I came across
problems with the 'hist' functions (e.g., bug PR# 944, posted in
2001), however, a quick search did not find the exact problem I a
found. A brief description of the issue follows.
> z<-rnorm(10)
> z
[1] 0.51649608 -0.20676010 0.65951365 0.46733006 0.02084361
0.18323525
[7] -0.21522566 0.29597667 0.81549448 0.26252625
> hist(z,breaks=seq(-1,1,by=.25))
> hist(z,breaks=seq(-1,1,by=.25),probability=TRUE)
I think the values on the Y axis are messed up, e.g., it should top
at 0.3 (relative frequency) for the bin [0.25 0.50). How is 'Density'
computed?
best regards,
Edo
-------------------------------------------------
Edo Airoldi, Ph.D.
Department of Computer Science &
Lewis-Sigler Institute for Integrative Genomics
Princeton University, NJ 08544
609-258-8326 (lab phone) 609-258-8004 (fax)
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