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Chi Square for R by C Table |
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Chi Square= | 40.54 |
Degrees of Freedom= | 4 |
p-value= | 0.00000003341 |
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| Cochran recommends accepting the chi square if: |
| 1. No more than 20% of cells have expected < 5. |
| 2. No cell has an expected value < 1. |
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In this table: |
| None of 9 cells have expected values < 5. |
| No cells have expected values < 1. |
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| Using these criteria, this chi square can be accepted. |
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| Expected value = row total*column total/grand total |
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| Rosner, B. Fundamentals of Biostatistics. 5th ed. Duxbury Thompson Learning. 2000; p. 395 |