Why do some SNPs have no tests listed as predictors?
While Tagger tries very hard to find an effective predictor on the basis of the picked tags to capture all alleles of interest (SNPs and, if specified, haplotypes), it may be possible that some alleles cannot be captured well (with adequate r2). If a test falls below a certain cutoff (default is r2 < 0.1), Tagger will just ignore that test and put -1's to indicate that allele is not captured.