Summary
Purpose
Summarizing statistics for sample data.
Synopsis
- summ = summary(x)
- text = summary(x, n)
Description
Given a data matrix (x) (numeric or DataSet object) this function calculates the following statistics for each column of x:
- mean = mean of the sample
- std = standard deviation of the sample
- n = number of observations
- min = minimum value in the sample
- max = maximum value in the sample
- p10 = tenth percentile
- p25 = twenty-fifth percentile (lower quartile)
- p50 = fiftieth percentile (median)
- p75 = seventy-fifth percentile (upper quartile)
- p90 = nintieth percentile
- skew = skewness
- kurt = kurtosis
With only one input, the output is a DataSet object with the above statistics as rows of the matrix. If the second input (n) is also supplied, the output is a text table describing all of the statistics for the first n columns of the input data.
If summary is called without requesting a return value, it prints to the command window a summary table containing up to 20 columns (default), or up to number specified by the (n) input parameter.
If input x is a multi-dimensional array, the statistics are calculated for each multi-dimensional column of the array (the result will have the same dimensions on modes 2-k where k = number of modes in x).
Inputs
- x = matrix (column vector) in which the sample data is stored.
Optional Inputs
- n = number of columns to include in a text-formatted description of the summary statistics. Default is to analyze all columns (if output DataSet is requested), or the first 20 columns (if no output is requested.)
Outputs
- summ = a DataSet object with rows corresponding to the statistics described above, or (when the input n is supplied) a text table of the statistics.
Examples
summ = summary(x);