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Observed and expected frequencies of significant genes for two and three microarray experiments.
| Experiments compared1 | Significance1 | Observed | Expected | Chi-squared2 |
| C & S | C & S | 4964 | 3483 | 2834 |
| C only | 1407 | 2888 | ||
| S only | 1864 | 3345 | ||
| Neither | 4253 | 2772 | ||
| C & S & R | C & S & R | 249 | 77 | 3240 |
| C & S | 4964 | 3483 | ||
| C & R | 11 | 64 | ||
| S & R | 14 | 74 | ||
| C only | 1407 | 2888 | ||
| S only | 1864 | 3345 | ||
| R only | 4 | 62 | ||
| None | 4249 | 2710 |
1C = Clarkson et al. (16); R = Ron et al. (17); S = Stein et al. (18)
2Highly significant by any criterion
