RWe ran a billing analysis where we looked at gas utility customers' monthly usage data. We need to match it to weather data, normalize for weather, calcualte a baseline usage (based on summer months July and August), subtract baseline usage from winter month usage to end with a weather-normalized heating usage. The last step is to run a regression on usage and the efficiency of the heating equipment. This anaylsis was done previously in R, by a previous employee. I have a short deadline for this project and am not familiar with R code. Ideally, someone would look at the existing R code and write it so it can be ran in SPSS.