In reply to J.C.Ray.

The formula you are using is not correct. The correct formula is shown in the REG doc, which I link to in the first sentence of the second section. When I mentioned at the end of the article that "to standardize the statistic, divide by the standard error of the parameter estimates," I did not intend to imply that the formula is (b - b(i))/StdErr(i), but I see how you could interpret my remark that way. Apologies if my comment about standardization misled you.