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hello #psychology #stats twitter!
a while ago i promised some graphs on why #removing #outliers using a simple cut-off (eg, >2SDs) is a #bad idea
so that I can sleep at night again, here they are
tldr: DON'T (blindly) USE FIXED OUTLIER CUT-OFFS LIKE >2SD. EVER.
1/15
a while ago i promised some graphs on why #removing #outliers using a simple cut-off (eg, >2SDs) is a #bad idea
so that I can sleep at night again, here they are
tldr: DON'T (blindly) USE FIXED OUTLIER CUT-OFFS LIKE >2SD. EVER.
1/15
some twitter background:
2/15
2/15
for some reason, it's very common in #psychology to remove 'outliers' from data
most common way: exclude data more than two standard deviations from mean
we spend time & money collecting data, then throw 5% away
🤷
I don't know why, or where it's taught, but there it is
3/15
most common way: exclude data more than two standard deviations from mean
we spend time & money collecting data, then throw 5% away
🤷
I don't know why, or where it's taught, but there it is
3/15
