create_sa_str: Use seasonal factors to create monthly or quarterl seasonally...
In aranryan/arlodr:

my thought process on this function had originally been that it would start with a dataframe that had a single underscore between the segment code and the variable code. So all segment and geographic info would be in the segment code. But then I got into the Host work, and realized that it was potentially useful to have additional segment, geography, country information in the mneomonic, separated by underscores. But I couldn't figure out how to write a regular express than would just break of the lodging variable concept. What I could do was break up the other stuff until I was left with the lodging concept. But that pointed to the idea of staying flexible on the set up of the dataframe going into this function. So it is more generalized. Also, I realized that the monthly and quarterly were doing the same thing, so I combined them. I left the monthly and quarterly ones there, but I could get rid of them once I bring the US lodfor process onto the same footing. LAter in Sept. 2016, I wanted to add some calculations related to room changes, but in lodfor_v2, I still seemed to be using the separate monthly and quarterly create str steps. So I created the create_sa_str_v2 as what I would use going forward.