[R] Extracting portions of one vector to create others

[Paul Zachos]

Dear Colleagues,

I have a vector which indicates membership of subjects in one of 5 Classes

Beth$CLASS
 [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2
[37] 2 2 2 2 2 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 7 7 7 7 7 7 7 7 7 7 7
[73] 7 7 7 7 7 7 7 7 7 9 9 9 9 9 9 9 9 9 9 9 9 9 9 1

For purposes of an analysis (using linear models based on Ward and Jennings) I would like to create 5 new vectors

The values in vector CLASS1 will be ‘1’ if the corresponding value in Beth$CLASS is equal to ‘1’; ‘0’ otherwise

The values in vector CLASS2 will be ‘1’ if the corresponding value in Beth$CLASS is equal to ‘2’; ‘0’ otherwise

The values in vector CLASS4 will be ‘1’ if the corresponding value in Beth$CLASS is equal to ‘4’; ‘0’ otherwise

The values in vector CLASS7 will be ‘1’ if the corresponding value in Beth$CLASS is equal to ‘7’; ‘0’ otherwise

The values in vector CLASS9 will be ‘1’ if the corresponding value in Beth$CLASS is equal to ‘9’; ‘0’ otherwise

How would I go about this using R

Thank you
_________________
Paul Zachos, PhD
Director, Research and Evaluation
Association for the Cooperative Advancement of Science and Education (ACASE)
110 Spring Street  Saratoga Springs, NY 12866  |  
paz using acase.org  |  www.acase.org





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