I'm trying to use Analog Statistics on a calculated tag. The minimum and maximum values for yesterday are always the same. The calculated tag is combining a low and high register value for flow pulses. You can see the direct reading of the low register tag (2nd pic) shows yesterdays minimum and maximum values correctly. I also attached the calculation tag and expression I used. Why do the statistics not work for the calculation tag? Also, why does the Historical Data Viewer not represent the true reading of the calculation? Days will go by on the Data Viewer before there is a change and it is not correct.