Table 2

Area under the ROC curve derived from different stages of the CARAT method.

Area under ROC Curve
1X
3X
4X
5X

Stage 1
0.6240
0.5188
0.6575
0.7863
Stage 2
0.6732
0.5384
0.6840
0.8128
Stage 3
0.9319
0.8987
0.9546
0.9877
Stage 4
0.9887
0.9759
0.9974
0.9995
Stage 5
0.9999
0.9999
1.0000
1.0000

Note:

1The specificity is estimated using the 47 female samples that are a subset of the 90 normal test set samples and is restricted to the 1955 X chromosome SNPs. The sensitivity is estimated on 1955 X chromosome SNPs using DNA samples with 1X, 3X, 4X and 5X chromosomes.

2Stage 1: Single point analysis: no probe selection, no intensity adjustment on fragment length and GC content; no intensity adjustment on reference mean.

3Stage 2: Stage 1 plus probe selection.

4Stage 3: Stage 2 plus intensity adjustment on the fragment length and GC content and intensity adjustment on the reference mean.

5Stage 4: Stage 3 plus kernel smoothing with a 100 kb window.

6Stage 5: Stage 4 plus genome partitioning using the regression tree.

Huang et al. BMC Bioinformatics 2006 7:83   doi:10.1186/1471-2105-7-83