Global demand for rice genetic resources

Table 9 Estimation results

Model	OLS	Poisson		Negative Binomial
Dependent: Number of requests per accession	Coefficients	Coefficients	IRR	Coefficients	IRR
PDCI	0.3754***	0.1743***	1.1904	0.0778***	1.0809
Years in storage	0.0304***	0.0174***	1.0175	0.0123***	1.0124
MLS status	6.5148***	1.6848***	5.3913	1.7194***	5.5810
Biological status
100 Wild	0.6562***	0.3500***	1.4191	0.5449***	1.7244
200 Weedy	− 0.4917***	− 0.1878***	0.8287	− 0.0290	0.9714
300 Traditional cultivar/landrace	− 0.7273***	− 0.3134***	0.7310	− 0.1087***	0.8970
400 Breeding/research material	− 0.2103***	− 0.0925***	0.9116	− 0.0245	0.9758
420 Genetic stock	7.7553***	2.3643***	10.6363	2.1294***	8.4102
423 Other genetic stock	− 0.0078	− 0.0698**	0.9325	− 0.1301*	0.8780
500 Advanced or improved cultivar	1.1637***	0.5846***	1.7943	0.6395***	1.8956
999 Other	0.6460	0.3701	1.4479	0.4714	1.6023
R-squared/Pseudo R-squared	0.4203	0.3252		0.1742

Number of observations = 23,210
***, ** and * denote statistical significance at the 1%, 5%, and 10% level, respectively

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