Regression for GLA Adjustment

[Mejappz]

so the data is only as good as its manipulated?

Your question is unclear. Data manipulation can refer to different processes depending on the context. If you mean correcting known errors or inconsistencies in your data set, then yes, you need to manipulate your data in the same way as you would do in the grid. For example, you cannot simply assume that the GLA or garage space count are accurate when exporting your comps into the sales grid. It is your responsibility as an appraiser to ensure that your data is as clean and reliable as possible.