Hello, Thanks for your reply! Please see attached file. I want to cluster my samples based on their melting point, functionality and activity, but the activity is only meaningful when one knows the temperature at which the activity was measured. Generally at higher temperatures the activity is higher, but there is no direct correlation (because of many other parameters being involved). Hence the sample that has activity of 1 at 16 degree is very different than the sample that has activity of 1 at 20 degree. I hope it is more clear now?