I'm new to Quantopian and I am having trouble with pipeline calculations. I am calculating moving averages in the pipeline and assigning it to a column, but I want to use those moving averages in new calculations (using a custom factor) to populate a new column. I can't seem to get my code to pull from the moving average column in the pipeline, run the new calculation, then store it in a new column. What would be a simple way to solve this? Is there any sample code out there to provide examples? Also, is this even the best method?