Calcite | Level 5

## calculation

Hi team,

i need help to solve below calculation

Using the file “sleep” (http://www.statsci.org/data/general/sleep.txt and http://www.statsci.org/data/general/sleep.html)

1. Calculate percentile (P84, P95, P97.5 and P99.85) and sigma limits (Mean + SD, Mean + 2*SD and Mean +3*SD) of total sleep by overall danger index before and after the 5% outliers removal, and comment on the observations.
3 REPLIES 3
Diamond | Level 26

## Re: calculation

Calcite | Level 5

## Re: calculation

P84, P95, P97.5 and P99.85 what it means?
SAS Super FREQ

## Re: calculation

It means the 84th, the 95th, the 97.5th and the 99.85th percentiles.

These are sample estimates. They estimate the values in the population for which 85%, 95%, etc, of the population values are less than the values. For example, if the 84th percentile is 12.3, that means that 84% of the population values are less than 12.3.  If the 95th percentile is 15, that means that 95% of the population values are less than 15.

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