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Table 1 Empirical powers at markers near the QTL for RF-IgM on chromosome 11 at level 0.001

From: A nonparametric regression-based linkage scan of rheumatoid factor-IgM using sib-pair squared sums and differences

Marker

Position

NPDa

NPSDb

HEDc

ECPd

STRP11_21

110 cM

0.10

0.23

0.06

0.11

STRP11_22

113 cM

0.10

0.23

0.06

0.13

STRP11_23

117 cM

0.10

0.23

0.06

0.13

STRP11_24

124 cM

0.09

0.21

0.05

0.09

  1. aNPD, nonparametric regression using squared differences only
  2. bNPSD, nonparametric regression using both squared sums and squared differences
  3. cHED, Haseman-Elston regression using squared differences [10]
  4. dECP, Elston et al. regression using mean-corrected cross-products [7]