The NorthPeak fault model learned from the readings of one period. Time passes, seasons change, bearings get replaced, and the data the model sees no longer looks like the data it learned from. That change is called drift, and it comes in two kinds. Data drift means the inputs moved; concept drift means the link between inputs and target moved. This lesson explains the difference, introduces PSI, one number that spots the first kind, and reads the real drift table of Q1 against Q4 in readings.csv.
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