文档介绍：Chi-Square Test
Chapter 7
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Content
test of fourfold data
test of paired fourfold data
Fisher probabilities in fourfold data
test of R×C table
parison of sample rates
test of goodness of fit
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objection:
to deduce if there is any discrimination of the ratio or structure ratio between two populations or among more than two populations
parison of the ratio of multi-samples
to deduce if there is any correlation between two class variables
test of goodness of fit
test statistic :
fit for :qualitative data
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Section 1 test of fourfold data
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objective:to judge if there is any discrimination of the rate or structure ratio between two populations (equal to the u-test)
demand:the number of individuals from the two samples classified into two categories should be transformed into a fourfold data
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(1) distribution is a continuous distribution:
(2) one of the basic characters is that it can be plus to others :
1 The basic idea of test
distribution
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2. The basic idea of test
eg 7-1 one hospital want pare the curative effect of drug A(experimental group)and drug B control group)in lowering encephalic pressure。They classified 200 patients with high encephalic pressure into two groups at random,the results are as follows (table 7-1)。So whether the effective ratio is different?
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Table 7-1 parison of the efficient ratio between two groups in lowering encephalic pressure
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this data can be sorted into the form as chart7-2,that is to say there are two groups disposed, the number of each of them is made up of two parts, occurred and not occurred. There are four basic data( )in the table ,and other data can be induced by them, that is why it is called fourfold table data.
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