Table 2.

Summary results of improved varieties adoption estimates established through DNA fingerprinting and derived from the three methods.

	Method A*	Method B	Method C
% True positive (improved when improved)	43	47	50
% True negative (local when local)	16	4	6
% False positive (Type I Error: improved when local)	20	33	31
% False negative (Type II Error: local when improved)	19	16	13

^*2% of respondents did not know whether the variety is improved or local.