FAQ/zpercs22013-10-03 13:54:22PeterWatson12013-10-03 13:53:52PeterWatsonHow do I convert a s-core into a percentile in SPSS?The below computes 100 P(Z < z) in SPSS. So putting z equal to 1.96 gives a perc of 97.5% since 97.5 percent of the Normal distribution is less than the mean plus 2 standard deviations.