Table 8.

Results From Likelihood Ratio Testing for Goodness of Model Fit in a Comparison of the Restricted Models A–D (See Text) With the General Error Model, Showing the Number of Observed Genotype Pairs and the Number of Discordant Genotype Pairs As Expected Under the Various Error Models

Model	No. of Discordant Genotype Pairs (r02, r01, r12)a	No. of Parameters	Log-Likelihood	λ for Comparison with General Modelb	Degrees of Freedom	P Value
Observed	20, 123, 67
General model (model A)	21.5, 122.5, 64.4	6	−46,768.5
Zero-corner model (model B)	0.2, 146.3, 87.4	4	−46,834.1	131.2	2	<10−3
Symmetrical model (model C)	19.9, 122.1, 68.1	3	−46,772.1	7.2	3	0.07
Allele-independent model (model D)	0.1, 168.7, 61.0	1	−46,861	185	5	<10−3

^aNo. of parameters in restricted model; r₀₂, r₀₁, and r₁₂ refer to the notation in Table 1.

^bWith λ = −2 × (ln L_restricted − ln L_general) ∼ χ_df² (6 df).