About Site Map Submit Contact Us Log in | Create an account
Create an account Log In
Average Rating
User Rating:
Visitors Rating:
My rating:

Write review
See full specifications

scripts default iconRNDTTEST (Scripts) Publisher's description

Permutation or randomisation tests are a useful alternative to more standard parametric tests for analysing experimental data

Permutation or randomisation tests are a useful alternative to more standard parametric tests for analysing experimental data. They have the advantage of making no distributional assumptions (such as Normality)about the data, while remaining as powerful as more standard tests. The t-test assumes that the two groups arose by drawing samples from two Normally distributed populations, and that we are investigating whether these populations differ in their mean.
The randomisation test, on the other hand, assumes that some initial set of individuals were randomly allocated to two treatment groups. The number of permutations to be examined soon grows prohibitively large, so, this function uses two approaches: an Exact Method when the possible permutations are less than 20.000 and a Monte Carlo Naive Method when the
permutations are more than 20.000.
X1=[12 17 14]; X2=[21 16 18];


Answer is:

Exact Method
20 randomisations evaluated
Probability (p-value) that the observed difference is accidental: 0.2000

This p-value is the best one that can be quoted for these data. It is based only on the assumption that individuals are allocated at random to groups. It does not assume anything about Normality of distributions, which may or may not be true. Even when such assumptions are true, the randomisation test is as powerful as a t-test. (If you are curious, a t-test of the experimental data in our example gives p=0.12)

System Requirements:

MATLAB 7.5 (R2007b)
Program Release Status: New Release
Program Install Support: Install and Uninstall

RNDTTEST (Scripts) Tags:

Click on a tag to find related softwares

Is RNDTTEST (Scripts) your software?

Manage your software

Most Popular

scripts default icon ASK, OOK, FSK, BPSK, QPSK, 8PSK modulation 1.1
ASK, OOK, FSK, BPSK, QPSK, 8PSK modulation contain several functions for digital modulation simulation
scripts default icon Simulink Communication Labs 1.1
Simulink Communication Labs allows you to learn communication systems in greater depth.
scripts default icon M-QAM modulation and demodulation 1.1
M-QAM modulation and demodulation is the QAM modulation and demodulation tech.
scripts default icon LZW Compression/Decompression 1.1
LZW Compression/Decompression - Updated LZW compressor and decompressor with reasonable performance
scripts default icon InSPIRE utility to plot a 2D displacement field (Scripts) 1.0
This program plots the deformation field (displace vectors) contained in vector.txt.