Top "Summary" questions

Summary statistics of a set of observations include the mean, median & the standard deviation.

Why does summary overestimate the R-squared with a "no-intercept" model formula

I wanted to make a simple linear model (lm()) without intercept coefficient so I put -1 in my model formula …

r summary intercept lm
How to get the sum of each four rows of a matrix in R

I have a 4n by m matrix (sums at 7.5 min intervals for a year). I would like to transform these …

r time-series summary