Calculating value means for each site and year in a data frame in R
55747
Grouping functions (tapply, by, aggregate) and the *apply family
66901
How to calculate the confidence interval of the mean of means?
21653
How to calculate pooled variance of two or more groups given known group variances, means, and sample sizes?
51319
How to compare group means for two samples with t-test using R?
97674
Accesing a variable in a ggplot function
117343
Average of multiple columns
112425
Calculating the average of variably sized blocks of numbers within a column?
109959
Calculate mean of ordinal variable
132574
Get the means of sub groups of means in R
90603
Dealing with timestamps in R
102482
Transpose a data frame
33910
R stem and leaf values
145177
Averaging correlation values
105097
Calculating sum of squared deviations in R
143423
How to extract values from rasters at location of points in R?
64536
How to correctly treat multiple data points per each subject
147397
How do I combine two data-frames based on two columns?