Optimum Stratification Using Dynamic Programming with a Mixture of Ratio and Product Estimators under Super Population Model

Table 1

Optimum strata boundaries, sample size, and total variance for log-normally distributed auxiliary variables.

L (no. of strata)	OSB	(sample size)	Total variance
2	4.2643	102	1.6355
		98
3	6.1785; 9.3972	70	1.0576
		64
		66
4	2.7314; 5.3049; 11.7431	52	0.8513
		51
		47
		50
5	1.9742; 3.1857; 7.2533; 13.5943	40	0.6501
		42
		40
		41
		37
6	1.6476; 3.9182; 7.5193; 11.4136; 15.9548	34	0.4925
		36
		32
		31
		35
		32