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Average and Standard Deviation without outliers in Excel

September 2nd, 2011 admin

Sometimes you need the average and standard deviation of a dataset without a certain amount of outliers.

For example you want the average or standard deviation without the top 2.5% datapoints

{=AVERAGE(IF((DataRng<LARGE(DataRng,ROUNDUP((COUNT(DataRng)*0.025),0))),DataRng))}

{=STDEV.P(IF((DataRng<LARGE(DataRng,ROUNDUP((COUNT(DataRng)*0.025),0))),DataRng))}

If you want the average without the top 10 and bottom 10 datapoints this would be your solution

{=AVERAGE(IF((DataRng<LARGE(DataRng,10))*(DataRng>SMALL(DataRng,10)),DataRng))}

happy averaging or standard deviating

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