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# lyngby_ts_pttest

## (export/lyngby/lyngby_ts_pttest.m)

### Function Synopsis

[p, t, df] = pttest(d1, d2)

### Help text

lyngby_ts_pttest - Student's paired t-test.
LYNGBY_TS_PTTEST(X1, X2) gives the probability that Student's t
calculated on paired data X1 and X2 is higher than
observed, i.e. the "significance" level. This is used
to test whether two paired samples have significantly
different means.
[P, T] = LYNGBY_TS_PTTEST(X1, X2) gives this probability P and the
value of Student's t in T. The smaller P is, the more
significant the difference between the means.
E.g. if P = 0.05 or 0.01, it is very likely that the
two sets are sampled from distributions with different
means.
This works for PAIRED SAMPLES, i.e. when elements of X1
and X2 correspond one-on-one somehow.
E.g. residuals of two models on the same data.
See also: TTEST, UTTEST.

Produced by mat2html on Wed Jul 29 15:43:40 2009

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