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GreggB
Pyrite | Level 9
I want to convert percentiles (pr) to NCE. I found the following formula:
nce = invnorm(pr/100)*21.06 + 50, where invnorm is the inverse normal probability function

I can't find invnorm anywhere in SAS. Any thoughts?
2 REPLIES 2
lvm
Rhodochrosite | Level 12 lvm
Rhodochrosite | Level 12
I think you want the probit() function. For instance, probit(.025) is -1.96.
GreggB
Pyrite | Level 9
Yep. the PROBIT function changes it to a Z score. Then, you can apply the formula for NCEs.

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