Having a bit of a mind-blank at the moment and am looking for some advice.
I am extracting features from time series data for input into a classification algorithm, for example I'm extracting average and variance from inputX.
For input Y, I have graphed the data and have seen that for class A, it can be seen that there is an upwards slope, and for class B, it can be seen that there is a downward slope, for class C there is no slope, the line is more or less straight. For Feature Extraction, how can I best describe this? Would a calculation to get positive/negative slope be best?