query: Mean per group in a data.frame
positive_passages.docid: 38829
positive_passages.text: Calculate the mean by group
negative_passages.docid: 39134
negative_passages.text: Subset data frame based on number of rows per group
negative_passages.docid: 124785
negative_passages.text: sample rows of subgroups from dataframe with dplyr
negative_passages.docid: 50752
negative_passages.text: Linear Regression and group by in R
negative_passages.docid: 155361
negative_passages.text: Split data.frame by value
negative_passages.docid: 123269
negative_passages.text: Are unequal groups a problem for one-way ANOVA?
negative_passages.docid: 13177
negative_passages.text: Numbering rows within groups in a data frame
negative_passages.docid: 112425
negative_passages.text: Calculating the average of variably sized blocks of numbers within a column?
negative_passages.docid: 68438
negative_passages.text: getting a sample of a data.frame in R
negative_passages.docid: 118325
negative_passages.text: R: Split unbalanced list in data.frame column
negative_passages.docid: 149256
negative_passages.text: Using data.table to aggregate
negative_passages.docid: 93101
negative_passages.text: Mean of each element of a list of matrices
negative_passages.docid: 51764
negative_passages.text: python groupby behaviour?
negative_passages.docid: 152881
negative_passages.text: Using R's lm on a dataframe with a list of predictors
negative_passages.docid: 151527
negative_passages.text: Using R statistics add a group sum to each row
negative_passages.docid: 15530
negative_passages.text: Variance of sample mean.
negative_passages.docid: 39641
negative_passages.text: How to split a data frame?