I am trying to determine outliers on one variable (e.g. self reported
money spent on gas). What I want to do is calculate the "studentized
deleted residual", i.e. a z-score that does *not* take the i-th value
into account for calculating the standard deviation and mean.
Technically, this is r-i = ((Y-i - Y-hat)/s-hat)
Where Y-hat is the mean of all datapoints *excluding* i, and s is the
standard deviation of all datapoints excluding i.
There are ways to get the studentized deleted residuals for a
regression analysis, but I don't have a dependent or independent
variable, I am just looking of a frequency count of one variable.
Does anybody know if there is an easy way to do this in SPSS? It would
be fairly straightforward in MS Excel, but I would like to avoid going
back and forth between the programs.