. Sampling designs for estimating the total number of fish in small streams. Fish populations Mathematical models. 1000 800 o o o. 600 5 400 - a E 3 Z 200 r= ; n= 50 pools 100 200 300 400 Pool size (m^) 500 600 Figure 2.—Total number of fish plotted against pool size for the sampling universe used for realistic applications of alternative two-stage sampling designs. Based on data collected from Knowles Creek, Oregon, by the USDA Forest -in4! ' i l 1 1 1 1 1 0 10 20 30 40 50 Sample size Figure 3.—Sampling variances (Y(Y)) for two-stage SRS (SRS), ratio estimation (RATIO) and PPS
. Sampling designs for estimating the total number of fish in small streams. Fish populations Mathematical models. 1000 800 o o o. 600 5 400 - a E 3 Z 200 r= ; n= 50 pools 100 200 300 400 Pool size (m^) 500 600 Figure 2.—Total number of fish plotted against pool size for the sampling universe used for realistic applications of alternative two-stage sampling designs. Based on data collected from Knowles Creek, Oregon, by the USDA Forest -in4! ' i l 1 1 1 1 1 0 10 20 30 40 50 Sample size Figure 3.—Sampling variances (Y(Y)) for two-stage SRS (SRS), ratio estimation (RATIO) and PPS without replacement (PPSWOR) sampling designs plotted against sample size for the Knowles Creek sampling universe. Values plotted for the ratio estimation design are actually MSE(Y) because the design is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hankin, David G. cn; Pacific Northwest Research Station (Portland, Or. ) cn. [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station
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