pyspark using groupby and a function together

I need to use groupBy together with a function for finding a slope in a command but I keep getting error. the slope is going to be found using regression. the slope needs to be found for the data grouped by 3 different columns.

the function I am going to use could be similar to the one in this link: Pyspark : how do I apply the function to get slope in a dataframe?

Thanks for your help



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