I have 30,000 patient visits and I am looking to find the weight change from the first to the last visit but I do not know how to remove patients with visits that a weight was not entered so it appears as a zero and the analysis reports that they lost all of their body weight. I am brand new at knime so this may seem like a simple question, but I have no idea how to manage it! Thank you in advance!
I also have to remove patients with only one visit.
Karen