I have a dataset with multiple variables having different distributions - some are normal and others are skewed. I want to summarize locations for some identified values on both kinds of distributions. Simple percentiles can work for both normal and skewed distributions. (http://www.dummies.com/education/math/statistics/how-to-calculate-percentiles-in-statistics/)
But what's the difference between using simple percentiles vs. z-scores for a normal distribution?