qchisq (PR#7212)
david.clayton@cimr.cam.ac.uk writes:
Full_Name: David Clayton Version: 1.8.1
....
qchisq behaves very strangely when ncp is passed as zero (forcing internal qnchisq to be called) when first argument is small. Eg
qchisq(1-1e-6, 1, ncp=0, lower.tail=TRUE)
qchisq(1-1e-6, 1, ncp=0, lower.tail=TRUE) [1] 1024 while, if ncp is unspecified,
qchisq(1-1e-6, 1)
qchisq(1-1e-6, 1) [1] 23.92813
As Brian once put it, we can't fix old versions retroactively. 1.9.1 has (on "Linux" as well, although that is a bit unspecific for numeric issues).
qchisq(1-1e-6, 1, ncp=0, lower.tail=TRUE)
[1] 23.92813
qchisq(1-1e-6, 1)
[1] 23.92813
Possibly, this is a side effect of
o qchisq(1-e, .., ncp=.) did not terminate for small e.
(PR#6421 (PR#875))
from BUG FIXES for 1.9.0.
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907