does std dev violate nonnegative constraint how is standard deviation determined in a dictionary why is it important to subtract the mean and divide by the standard deviation which procedure makes sense if data is nonnegative when to subtract and split mean by std does it make sense if std and m are the same how to subtract mean and divide by standard deviation when do you subtract means and divide by std what is it mean to subtract mean and divide mean by the standard deviation in data analysis? a definition for subtracting the normal mean for an image why divide by mean in nonnegative data why do you subtract the mean from each overlapping patch why does it make sense to divide by the standard deviation when do you subtract the mean and divide by the standard deviation do you divide mean or standard deviation? why divide the mean if the standard deviation is not negative why do we subtract t and divide by std when you subtract mean and divide standard deviation is it necessary to subtract the mean and divide the standard deviation why would you do a mean and std for an image