Re: [R] Validity of Pearson's Chi-Square for Large Tables

2009-06-03 Thread Gerard M. Keogh
Hi, didn't get your name. For large tables (5 X 5) or bigger the dist of the log of the cross product ratios tends to normality. there are (nC2)**2/2 of these (200 in a 5X5 table. The chi-sq test for independence fits a main effects loglinear model to the table and this can be expressed in terms o

[R] Validity of Pearson's Chi-Square for Large Tables

2009-06-02 Thread dsimcha
Is Pearson's Chi-Square test for contingency tables asymptotically unbiased for large tables (large degrees of freedom) regardless of the expected values in each cell? The rule of thumb is that Pearson's Chi-square should not be used when large numbers of cells have expected values < 5. However,