Calculating anomalies to create a map
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I have the zscores for the years with high precipitation and low precipitation I am trying to calculate the difference in precipitation between high years and low years. For each grid. The data set is for precipitation with the dimensions of x=141, y=71 and t=38. After that I will try to display on the map the significance by using a student test of means. My code for the first part of is the following but it not working as my expectation. Rain file contains the raw data, out contain the z-scores and mean rain contain rain average.
Thanks for your help