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. 2011 Jun 7;12:228. doi: 10.1186/1471-2105-12-228

Table 3.

Table of raw p-values for Welch t-statistics and limma methods using Inline graphic and Inline graphic from the apoAI control treatment expression data.

rank p-value (Inline graphic) rank p-value (Inline graphic) rank p-value(limma (Inline graphic)) rank p-value(limma (Inline graphic))
1 7.3 × 10-7 1 4.2 × 10-6 1 3.8 × 10-12 1 1.5 × 10-9
2 2.4 × 10-5 2 2.4 × 10-5 4 5.2 × 10-7 4 1.3 × 10-6
3 3.4 × 10-5 4 4.0 × 10-5 2 2.6 × 10-8 3 1.2 × 10-7
4 5.0 × 10-5 3 2.8 × 10-5 3 5.1 × 10-8 2 7.6 × 10-8
5 1.0 × 10-4 6 1.2 × 10-4 5 1.4 × 10-6 6 7.5 × 10 -6

6 1.0 × 10-4 5 5.8 × 10-5 7 9.6 × 10-6 7 1.2 × 10-5
7 2.9 × 10-4 7 2.7 × 10-4 12 4.5 × 10-5 11 3.7 × 10-5
8 5.9 × 10-4 9 6.4 × 10-4 8 1.3 × 10-5 16 4.8 × 10-5
9 7.4 × 10-4 8 5.8 × 10-4 10 1.5 × 10-4 61 3.3 × 10-4
10 1.3 × 10-3 10 1.1 × 10-3 6 2.0 × 10-6 5 1.4 × 10-6

rank t-stat (Inline graphic) rank t-stat (Inline graphic) rank t-stat(limma (Inline graphic)) rank t-stat(limma (Inline graphic))

1 -16.5 1 -12.8 1 -23.1 1 -14.4
2 -9.8 2 -9.8 4 -9.0 4 -8.3
3 -9.3 4 -9.1 2 -11.5 3 -10.1
4 -8.8 3 -9.6 3 -10.9 2 -10.5
5 -7.9 6 -7.7 5 -8.2 6 -7.0
6 -7.8 5 -8.5 7 -6.7 7 -6.7

7 6.6 7 6.7 12 5.9 11 6.0
8 -5.9 9 -5.8 8 -6.7 16 -5.9
9 -5.7 8 -5.9 10 -5.2 61 -4.8
10 5.2 10 5.3 6 8.0 5 8.2

The limma method was developed for log-ratios, not proportions, but we show the results using proportions for comparison. The first group of ten rows are the p-values and the second group is the t-statistics, for reference. In the original paper, the top 8 probes were selected using the maxT multiple testing procedure with using Welch t-statistics on Inline graphic in [12]. This selection is the first column, ranked 1 through 10. The p-values/t-statistics for the probes using Inline graphic and limma correspond to the first column, with their ranks shown. Using t-statistics with Inline graphic, the selection is similar to Inline graphic, but not identical, since probes ranked 8th and 9th switch places. Using limma with Inline graphic and Inline graphic, the selection begins to vary widely at the 7th probe.