. Levels-of-growing-stock cooperative study in douglas-fir. Figure 21.—Comparison of shapes of installation curves (IndG = a; + blnRD + cRD) fitted with common slopes for all periods within a single installation. Estimates expressed as ratios of estimated dG to expected dG for RD50. r - O m h Q DC fe - O 3 - o 0 0 Clemons ". Rocky Brook Iron Creek Francis Hoskins Z'i Skykomish Sayward 10 20 30 40 50 RD 60 70 80 90 A single regression for combined data.—A single regression with common b and c coefficients and with periods represented by dummy variables was fitted to
. Levels-of-growing-stock cooperative study in douglas-fir. Figure 21.—Comparison of shapes of installation curves (IndG = a; + blnRD + cRD) fitted with common slopes for all periods within a single installation. Estimates expressed as ratios of estimated dG to expected dG for RD50. r - O m h Q DC fe - O 3 - o 0 0 Clemons ". Rocky Brook Iron Creek Francis Hoskins Z'i Skykomish Sayward 10 20 30 40 50 RD 60 70 80 90 A single regression for combined data.—A single regression with common b and c coefficients and with periods represented by dummy variables was fitted to all data exclusive of the Clemons and Rocky Brook studies. Standard error of estimate was The dashed line in figure 22 is derived from this regression, and has the equation: Y = EXP[ + (lnRD) - (RD)] ; where: Y = dG/(dGest for RD70) . Because variances are not homogeneous, significance of differences among individual installation curves cannot be tested. It seems clear, however, that this is a good average of the individual installation curves. The solid line in figure 22 represents a similar curve derived from a regression fitted to all data, including Clemons and Rocky Brook. Although the Clemons and Rocky Brook curves diverge from the others and the differences for Clemons are probably real, inclusion of the additional data alters shape and position of the average curve only slightly, while it increases the standard error of estimate to The solid curve in figure 22 has the equation: Y = EXP[- + (lnRD) - (RD)] . 47. 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 Curtis, Robert O. cn; Marshall, David D. cn; Pacific Northwest Research Station (Portland, Or. ) cn. [Portland, Or. ] : U. S. Dept. of Agriculture, Forest Service, Pacific Northwes
Size: 2477px × 1009px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
