R : R: "apply" statement to take the sum of the number of non-NA values across multiple columns

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R : R: "apply" statement to take the sum of the number of non-NA values across multiple columns
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R : R: "apply" statement to take the sum of the number of non-NA values across multiple columns
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R: non-NA sum multiple R to statement the across values number take : of of the "apply" columns



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