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Table 2 Dummy Variable Coding for K-3 Sample. Four groups are coded by three variables, as follows:

From: Martial arts as a mental health intervention for children? Evidence from the ECLS-K

  K, not 3 code 3, not K code BothK3 code
Martial in K, not 3 1 0 0
Martial in 3, not K 0 1 0
Martial in K and 3 0 0 1
Martial in neither K nor 3 0 0 0