i have sashelp.class
1 Alfred M 14 69.0 112.5 2 Alice F 13 56.5 84.0 3 Barbara F 13 65.3 98.0 4 Carol F 14 62.8 102.5 5 Henry M 14 63.5 102.5 6 James M 12 57.3 83.0 7 Jane F 12 59.8 84.5 8 Janet F 15 62.5 112.5 9 Jeffrey M 13 62.5 84.0 10 John M 12 59.0 99.5 11 Joyce F 11 51.3 50.5 12 Judy F 14 64.3 90.0 13 Louise F 12 56.3 77.0 14 Mary F 15 66.5 112.0 15 Philip M 16 72.0 150.0 16 Robert M 12 64.8 128.0 17 Ronald M 15 67.0 133.0 18 Thomas M 11 57.5 85.0 19 William M 15 66.5 112.0
but to keep every 3rd record sex variable keep in samll letter like see below dataset
1 Alfred M 14 69.0 112.5 2 Alice F 13 56.5 84.0 3 Barbara F 13 65.3 98.0 4 Carol f 14 62.8 102.5 5 Henry m 14 63.5 102.5 6 James m 12 57.3 83.0 7 Jane F 12 59.8 84.5 8 Janet F 15 62.5 112.5 9 Jeffrey M 13 62.5 84.0 10 John m12 59.0 99.5 11 Joyce f 11 51.3 50.5 12 Judy f 14 64.3 90.0 13 Louise F 12 56.3 77.0 14 Mary F 15 66.5 112.0 15 Philip M 16 72.0 150.0 16 Robert m 12 64.8 128.0 17 Ronald m 15 67.0 133.0 18 Thomas m 11 57.5 85.0 19 William M 15 66.5 112.0
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