The help says that it just computes the dot product without any normalization with -dot.
-dot = Doesn’t actually compute a correlation coefficient; just
calculates the dot product between the y1D vector(s)
and the dataset time series.
Either leave it out to get the Pearson correlation coefficient or choose one of the other options.
The
National Institute of Mental Health (NIMH) is part of the National Institutes of
Health (NIH), a component of the U.S. Department of Health and Human
Services.