Ttest1: Difference between revisions
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===Purpose=== | ===Purpose=== | ||
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* '''ttest''' = [-1,{0},1] indicates what ttest is for: | * '''ttest''' = [-1,{0},1] indicates what ttest is for: | ||
** '''-1''' - lower tail H0: mean(x) <= mean(y) | |||
* '''-1''' - lower tail H0: mean(x) <= mean(y) | ** '''0''' - wo-tail H0: mean(x) \~= mean(y) {default} | ||
** '''1''' - upper tail H0: mean(x) >= mean(y) | |||
* '''0''' - wo-tail H0: mean(x) \~= mean(y) {default} | |||
* '''1''' - upper tail H0: mean(x) >= mean(y) | |||
====Outputs==== | ====Outputs==== | ||
Revision as of 11:24, 9 October 2008
Purpose
One sample t-test.
Synopsis
- result = ttest1(x,mu,test)
Description
Calculates a one sample t-test for sample (x).
Inputs
- x = The name of a matrix (column vector) in which the sample data is stored.
- mu = scalar, the null hypthesis value for the mean {default = 0}.
- ttest = [-1,{0},1] indicates what ttest is for:
- -1 - lower tail H0: mean(x) <= mean(y)
- 0 - wo-tail H0: mean(x) \~= mean(y) {default}
- 1 - upper tail H0: mean(x) >= mean(y)
Outputs
The output (result) a structure with the following fields:
- t = test statistic.
- p = probability value
- mean = mean of x
- var = variance of x
- n = length of x
- se = standard error
- df = degress of freedom
- hyp = hypothesis being tested
Examples
result = ttest1(x);
result = ttest1(x,mu);
result = ttest1(x,mu,test);