Im brand new to the world of Quantopian and im still getting my feet wet with programming my first algo. Im trying to create an algo that is long only and buys US stocks which have a current price above its 50day simple moving average and have an ROE/PE ratio greater than 1.5. If the current price moves below the 50 then the stock gets sold. I would like to start with something simple like this and then continue to add other technicals such as Williams %R. I tried looking through some of the documentation in learn but couldn't figure out to call things like ROE/PE or W%. Thanks a bunch for any help!