Hi, I am trying to use R to mimic what I did in SAS.
proc transreg data=x ;
model identity(GSI)=monotone(group1);
output out=d2 pprefix=M;
run;
Accroding to SAS documentation, the MONOTONE transfomation algorithm comes
from (Kruskal 1964, secondary approach to ties). I have tried ace. it does
provide some kind of monotone transformation, but it is not what I expected.
Here is how sas output look like:
Obs GSI TGSI group1 Tgroup1
1 0.81301 0.81301 1 1.55594
2 0.79359 0.79359 2 1.55594
3 1.26900 1.26900 3 2.59702
4 2.02680 2.02680 4 4.29111
group1 is the inital value. Tgroup1 is the monotone transformed value.
Here is how Transformed value output from ace:
$tx
[,1]
[1,] -0.5698602
[2,] -0.1899534
[3,] 0.1899534
[4,] 0.5698602
Does anybody have any idea whether I could do the similar thing in R? If I
can do it, which function I should use?
Thanks,
Jingyu
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