Maximum Value in Subset

What was the maximum ozone value in the month of May (i.e. Month = 5)?

Google “R subset data maximum value”:

[1] http://stackoverflow.com/questions/12350783/find-max-mean-min-of-the-a-subset-in-r

ProgrammingQuizW1_data_subset3

ProgrammingQuizW1_data_subset3_max

 

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About Lisa Cohen

PhD student at UC Davis.
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