average -- compute the average and standard deviation
- Chosen from "add", "subtract" or "new_sample", in which case the numbers averaged are those in STDIN. If no argument is given on the command line, "new_sample" is assumed.
Task average computes the average and standard deviation of a list of numbers. Numeric input is read from STDIN with one number per line. The mean, sigma and number of samples are written to the standard output.
By default, the sample is taken to be the set of numbers in the standard input when average is run. Additional points can be added to or deleted from the sample by rerunning average with option equal to one of the following:
add -- add points to the sample, recalculate mean and sigma sub -- subtract points from the sample
The sample is reinitialized by setting option = "new_sample".
Run average on the list of numbers in file "numbers".
cl> type numbers | average
Add in to the sample the list of numbers in file "numbers.2".
cl> average add < numbers.2