From what I remember of reading the paper yesterday, they simply estimated the coefficient of various lag terms. That might help if you wanted to estimate how m

From what I remember of reading the paper yesterday, they simply estimated the coefficient of various lag terms. That might help if you wanted to estimate how many stars a project will have next week (because of some prediction market?). For the task of predicting which projects will attract more stars, the fitted model is largely unnecessary -- more means more.