Consider the factor vector explevels
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Consider the factor vector explevels <- gl(3, 2), and now change the third and fourth elements to 1 with explevels[3:4]<-1. Now, 2 is an extra factor level which is not present as a factor for any of its elements. Drop it! Use droplevels.
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Related Book For
A Course In Statistics With R
ISBN: 9781119152729
1st Edition
Authors: Prabhanjan N. Tattar, Suresh Ramaiah, B. G. Manjunath
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