I am wondering if someone can answer a nagging question I have about the best way to deal with outliers in heritability modeling.
It has been suggested to me that using z scores, anyone outside the cut off of +/- 2.5 should have their score altered to be the next extreme score (eg if we have scores of 2.5, 2.9, 3.2 etc these would be 2.5, 2.6, 2.7). I am concerned that this will really alter the heritability results. Any thoughts?
Is is better to just remove any outliers from the analyses?
And, if the latter, is the standard +/- 2.5 standard deviations the best cut off to use or is there a better determination?
Thank you so much