TABLE 3.

Estimation results for data with different category proportions

	Proportion of individuals having 0 trait value
No. of data sets detecting a certain no. of QTLa	0.2		0.35		0.5
		QTLB	bMIM	QTLB	bMIM	QTLB	bMIM	QTLC
0	25	2	7	0	10	0	0
1	44	14	39	4	36	4	12
2	25	31	39	20	35	20	22
3	4	35	14	41	14	42	35
4	1	14	1	31	5	32	29
5	1	4	0	4	0	2	2
Mean	1.15	2.57	1.63	3.11	1.87	3.08	2.87
Estimated heritability
h2	0.102	0.175	0.121	0.202	0.132	0.198	0.205
SDb	0.052	0.067	0.053	0.063	0.059	0.062	0.073

Results in this and all following tables are based on 100 simulated data sets, unless indicated otherwise. 4C4Q with h² = 0.3 is simulated for this table.

^aValues are the numbers of data sets (of 100) detecting certain numbers of QTL (given in the leftmost column). Mean is computed as , where N_dQ is the number of detected QTL and N_dD is the number of data sets detecting N_dQ QTL.

^bValues are the standard deviation for the corresponding heritability estimation.