Programming the statistical procedures from SAS

Converting percentiles to normal curve equivalents

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Super Contributor
Posts: 276

Converting percentiles to normal curve equivalents

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?
Valued Guide
Valued Guide
Posts: 684

Re: Converting percentiles to normal curve equivalents

I think you want the probit() function. For instance, probit(.025) is -1.96.
Super Contributor
Posts: 276

Re: Converting percentiles to normal curve equivalents

Yep. the PROBIT function changes it to a Z score. Then, you can apply the formula for NCEs.
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