I have got a list with 3 colums x,y,z, now I want do delete whole rows where column z has NA values I am not intereted in x and y columns if there are also NA values or not, moreover I do not want to touch them because if there would be NA that would mean a more serious error for me, and I have cath for that somewhere else I am asking because I only saw an example where function loops over all columns in a row and deletes row when any of them is NA, and that would be more time consuming I suppose than only traverse list by one column.
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