I know how to do this in SPSS but want to develop my Stata skills looking for help... please

I want to caluculate the centiles of a normal distribution, with a standardised variable sds, mean 0, and SD 1. Here is in SPSS:



* * Centiles.
numeric cent (f4.1).
compute cent=100*CDF.Normal(sds,0,1).
execute.

How would you do this in STATA?

I know (well I have been told) it is wrong to delete non-significant independent variables from a regression analysis and I have a basic idea of why (e.g. it leads to exaggeration of remaining effects). But I am writing up my modelling process in minute detail for my dissertation and I was wondering if anyone has a full explanation of why we should not delete non-significant variables, or perhaps you have some references?

Thanks
Jim ,-)