STAT212inferencefortwowaytables - Inference for Two-Ways...

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Inference for Two-Ways Tables - Two way categorical variables (or block design) Each intersection of values for these two variables is called a cell. Marginal distribution- is sum of a row or column. Conditional is the sum of a row or column, keeping the other variable constant. The question of interest is whether there is a relation between the row variable and the column variable. We want to know if the differences in sample proportions are likely to have occurred just by chance, because of the random sampling. We use the chi-square (χ2) test to assess the null hypothesis of no relationship between the two categorical variables of a two- way table. These hypotheses are neither one or two tailed - H0: There is no association between the row and column variables. H0 means that the c distributions of the row variable are identical. - Ha: There is an association between the row and column variables. Ha means that the distributions are not the same Expected counts in two way tables- We compare actual counts from the
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This note was uploaded on 02/27/2011 for the course STAT 2120 taught by Professor Jeffreyholt during the Fall '10 term at UVA.

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STAT212inferencefortwowaytables - Inference for Two-Ways...

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