Table 1 Comparison of computation times (in seconds) on an AMD Athlon XP 3000+ machine with one GB of RAM for both the matrix algebra based calculation and the individual determination of the values of Pearson's χ2-statistic for different numbers of variables and observations. Each of the m variables can take C = 3 levels, and each of the n observations belongs to one of R = 2 classes.
From: Empirical Bayes analysis of single nucleotide polymorphisms
| Â | Matrix Algebra Based | Individual | ||
|---|---|---|---|---|
m | n = 200 | n = 1, 000 | n = 200 | n = 1, 000 |
50 | < 0.01 | 0.01 | 0.13 | 0.16 |
100 | < 0.01 | 0.02 | 0.26 | 0.32 |
1,000 | 0.05 | 0.40 | 2.64 | 3.35 |
10,000 | 0.63 | 2.39 | 26.74 | 34.42 |
100,000 | 6.16 | - | 274.96 | - |