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lecture_08

# lecture_08 - Two-Way Contingency Tables Lecture 08 ILRST...

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Two-Way Contingency Tables Lecture 08 ILRST 411

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Residuals A cell by cell comparison of observed and estimated  frequencies helps us to understand the nature of evidence. For the test of independence, useful cell residuals have the  form   n ij  -    ij  /      ij ( 1- p i+ ) (1-p +j ) These are called adjusted residuals. An adjusted residual about 2 or 3 in absolute value indicates  lack of fit of Ho in that cell. µ µ
Residuals                                 Party identification                    Gender Democrat Independent Republican Females 279 73 225 Males 165 47 191

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Residuals Hence calculate adjusted residual for every cell. If the cells are showing greater discrepancy between
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• Spring '06
• DAS,T.
• Degrees Of Freedom, Null hypothesis, Statistical hypothesis testing, Chi-square distribution, Pearson's chi-square test, useful cell residuals

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