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Practical Predictive Analytics by Ralph Winters

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Confusion matrix for test group

The results for the test group are similar to those of the training group. Any discrepancies between test and training would warrant looking more closely at the model and observing how the data was sampled or split:

#Confusion matrix for TEST group result <- sql("select outcome,correct, count(*) as k, avg(totrows) as totrows from preds_tbl where grp=0 group by 1,2 order by 1,2") result$classify_pct <- result$k/result$totrows display(result)

Add up the correct calculation is a similar way to the training group. The results are slightly less, which is normal when comparing test to training results :

Summary ...

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