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R language uses the aggregate function to calculate the mean value (sum) of dataframe data grouping aggregation without setting na The result of RM calculation. If the group contains the missing value
2022-07-03 11:35:00 【statistics. insight】
R Language use aggregate Function calculation dataframe Mean value of data packet aggregation （sum）、 Not set up na.rm The result of the calculation 、 If the group contains missing values NA Then the calculation result is also NA
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