exctsmpl

Purpose

Computes a random subsample of a dataset.

Format

n_rows = exctsmpl(infile, outfile, percent)

Parameters:

• infile (string) – the name of the original dataset.

• outfile (string) – the name of the dataset to be created.

• percent (scalar) – the percentage random sample to take. This must be in the range 0-100.

Returns:

n_rows (scalar) –

number of rows in output dataset.

Error returns are controlled by the low bit of the trap() flag:

trap 0	terminate with error message
trap 1	return scalar negative integer
	-1	can’t open input file
	-2	can’t open output file
	-3	disk full

Examples

// Create file name with full path
fname = getGAUSSHome()$+ "examples/credit.dat";

// Randomly sample 30% of the rows from 'credit.dat'
// and write them to a new dataset in the
// GAUSS working directory, named 'sample.dat'
n_rows = exctsmpl(fname, "sample.dat", 30);

Remarks

Random sampling is done with replacement. Thus, an observation may be in the resulting sample more than once. If percent is 100, the resulting sample will not be identical to the original sample, though it will be the same size.

Source

exctsmpl.src