Ttest1: Difference between revisions

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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}
::    '''0''' - two-tail    H0: mean(x) ~= mean(y) {default}
::    '''1''' - upper tail  H0: mean(x) >= mean(y)
::    '''1''' - upper tail  H0: mean(x) >= mean(y)



Latest revision as of 16:24, 1 July 2011

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 - two-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);

See Also

ttest2e, ttest2u, ttest2p