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# chi2test 1.0

Date Added: May 25, 2013  |  Visits: 214

Usage: [p, Q]= chi2test(x) The chi-squared test.Given a number of samples this function tests the hypothesis that the samples areindependent. If Q > chi2(p, nu), the hypothesis is rejected. Each column represents a variables, each row a sample. If you find any errors, please let me know: . ARGUMENTS:x Absolut numbers.p The prob ability value, calculated from Q.Q The resulting Q-value. EXAMPLE 1In region A, 324 of 556 cows were red, whereas in region B 98 of 260 were red.[p, Q]= chi2test([324, 556-324; 98, 260-98])p= 4.2073e-08Q= 30.0515With an error risk of about 4e-08, we can claim that the samples are independent. EXAMPLE 2Throw two different dices to see if they have the same probability of 1 (and 2, 3, 4, 5, 6).We don't check if they are symetrical, only if the both behave in the same way.[p,Q] = chi2test([15,10; 7,11; 9,7; 20,15; 26,21; 19,16])p= 0.8200Q = 2.2059The dices don't significantly behave differently. That is, they seem to behave in the same way. HISTORY: v.1.0, first working version, 2007-08-30. COPYRIGHT: (c) 2007 Peder Axensten. Use at own risk.

 Requirements: No special requirements Platforms: Matlab Keyword: Check,  Claim,  Dices,  Don,  Probability,  Throw Users rating: 0/10

 License: Shareware Size: 10 KB
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