WQD.6 - Classification

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Sample R code for Classification

Nearest neighbor classifier is used with three levels (Low, Medium, High) of quality. It turned out that for k = 5, test data misclassification rate is lowest, when all predictors are being used.

  Quality Classification
Test Data Low Medium High
Low 293 185 46
Medium 267 595 215
High 44 159 233
Accuracy (293 + 595 + 233) / 2037 = 55%