I'm not even close to saying I'm versed in statistics...but I was wondering if anyone made a practice of discarding their highest & lowest chronographed velocities when determining their ES? This would be from at least a statistically significant population (at least 15...better to have 35+). I always seem to have a doozey or 2 in there--likely from an aspect of reloading, be it charge weight or a neck tension thing. It seems to falsely give me a greater than desired ES (30-40), when otherwise things looked better (15-25). I'm not sure if it is 'cheating', or an accepted practice when evaluating a string of data points--basically getting rid of the outliers.
The SDs sometimes do not bear out these larger ES values--meaning I can get desirable SDs (10-12), and groups to match...even if the ES is in the 40s.
I may be able to drive down the ES by babysitting other aspects of loading (eg. neck turning, which I don't do...but I do anneal). Even without doing that now, I've been please by and large with the body of data I collect--minus those outliers
Am I way off base here?
The SDs sometimes do not bear out these larger ES values--meaning I can get desirable SDs (10-12), and groups to match...even if the ES is in the 40s.
I may be able to drive down the ES by babysitting other aspects of loading (eg. neck turning, which I don't do...but I do anneal). Even without doing that now, I've been please by and large with the body of data I collect--minus those outliers
Am I way off base here?