How to find the difference between rows by a group with missing data?
I'm running into this issue where I have two sets of datapoints across my timeline. One is collected at every point in the interval, the other is collected sporadically. When placed together in a data table, one of the columns is missing data every in the interval. I attached a data table as an example but essentially looks like this: What I need now is to get the difference between rows that con...