query: Mean per group in a data.frame
positive_passages.docid: 24411
positive_passages.text: Aggregate / summarize multiple variables per group (e.g. sum, mean)
negative_passages.docid: 119153
negative_passages.text: Explaining Mean, Median, Mode in Layman's Terms
negative_passages.docid: 12817
negative_passages.text: Determining true mean from noisy observations
negative_passages.docid: 9201
negative_passages.text: Calculating Mean for Multiple Rows in ArcGIS for Desktop?
negative_passages.docid: 45771
negative_passages.text: Add (insert) a column between two columns in a data.frame
negative_passages.docid: 132210
negative_passages.text: How to assign a counter to a specific subset of a data.frame which is defined by a factor combination?
negative_passages.docid: 141208
negative_passages.text: subset a data.frame with multiple conditions
negative_passages.docid: 5136
negative_passages.text: How to sum a variable by group
negative_passages.docid: 33206
negative_passages.text: Derivation of Mode of grouped data
negative_passages.docid: 33457
negative_passages.text: Reshaping data.frame from wide to long format
negative_passages.docid: 31119
negative_passages.text: Count number of rows per group and add result to original data frame
negative_passages.docid: 21653
negative_passages.text: How to calculate pooled variance of two or more groups given known group variances, means, and sample sizes?
negative_passages.docid: 145742
negative_passages.text: Repeat rows of a data.frame N times
negative_passages.docid: 149640
negative_passages.text: calculate the mean of trials for each subject in R
negative_passages.docid: 125441
negative_passages.text: How to select the rows with maximum values in each group with dplyr?
negative_passages.docid: 6158
negative_passages.text: How to resample in R without repeating permutations?
negative_passages.docid: 158388
negative_passages.text: Sampling error with weighted mean