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If we drop one dummy, then the three distances will no longer be identical!For example, if we drop : Distance(#1, #2) = 1 1 = 2 Distance(#1, #3) = 1 Distance(#2, #3) = 1 The above problem doesn't happen with m=2. The distance between a pair of records will be 0 if the records are the same color, or 1 if they are different. If we use two dummies, we are doubling the weight of this variable but not adding any information.Break the Cycle is proud to have been granted the Love is Not Abuse campaign from Fifth and Pacific (formerly Liz Claiborne, Inc.).It is thus with great pleasure that we present their years of hard work and research excellence: finds that a significant majority of corporate executives and their employees from the nation's largest companies recognize the harmful and extensive impact of domestic violence in the workplace, yet only 13% of corporate executives think their companies should address the problem.To get your copy of this stat report, click on the button below to purchase it.Adolescence is a time of incredibly physical, social and emotional growth, and peer relationships – especially romantic ones – are a major social focus for many youth.I try to go through each and every stat regularly and update as much as possible, but we all know that some stats are easier to track down than others.

So we end up with distances of 0 or 2 instead of weights of 0 or 1.

Those who've taken a Statistics course covering linear (or logistic) regression, know the procedure to include a categorical predictor into a regression model requires the following steps: For example, if we have X=, in step 1 we create three dummies: D_red = 1 if the value is 'red' and 0 otherwise D_yellow = 1 if the value is 'yellow' and 0 otherwise D_green = 1 if the value is 'green' and 0 otherwise In the regression model we might have: Y = b0 b1 D_red b2 D_yellow error [Note: mathematically, it does not matter which dummy you drop out: the regression coefficients b1, b2 now compare against the left-out category].

When you move to data mining algorithms such as k-NN or trees, the procedure is different: we include all m dummies as predictors when m2) will distort the distance measure, leading to incorrect distances.

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