Table 4

χ2, df and p for models 0 to 4. Differences between these models are used to test hypotheses of main effects and interactions)

Model

χ2 (df)

p


1 (b = d, a = c = 0)

358.25 (3)

<0.0001

2 (a = c = 0)

357.52 (2)

<0.0001

3 (a = c)

1.764 (1)

0.184

0 (no restrictions)

0 (0)

1.00


Miles BMC Medical Research Methodology 2003 3:27   doi:10.1186/1471-2288-3-27

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