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T-value Calculation

I searched PCdmis help menu & this forum and couldn't find the formula that the software is using for calculation the reported T-values. Does anybody have this information?

I have some historic XYZ data & current data. The current data has T-values reported but the historic data does not. The customer wants to know the difference in historic & current data based only on the T-values.

Thanks in advance for your assistance.