After having read through the org-mode info on spreadsheets several times
and having also read through the calc info a few times I have not ben able
to get pstdev() to produce anything but errors. Having checked over the
data in a table, I found a couple instances where data values were missing
so I expect this could account for the errors by itself. In column 3 I
put the formula =pstdev(@<..@>) and also tried with =pstdev($3). What is
the correct syntax? I wasn't sure which if any would work after having
done all of that reading.