What is the biggest difference between perc<>() and using predict?

[aohls]

I have used predict before and now am seeing perc, which I haven't used as much. What is the largest difference between these two? Is one favored over the other or are they different?

[bowesmana · Accepted solution]

@aohls They are different beasts. predict is about forecasting, but perc is about calculating percentiles, e.g.

perc50(x) is the same as the median.

perc90(x) is the 90th percentile.

perc is used in aggregation commands, such as *stats, timechart.