. Levels-of-growing-stock cooperative study in douglas-fir. Table 21—Test of hypothesis of common slopes, b and c, by installation, in regressions, IndD = a + bRD + cln(Hi/Hm) One regression, Separate Regression with Period regressions common slopes slope common slopes Study SS 1/ df 2/ SS 1/ df 2/ SS XJ df 2/ F-test 3/ 4/ SEElndD Skykomish 100 0 501773 106 6 ns Hoskins .379595 95 396767 101 .017172 6 .7 ns .0627 Rocky Brook .851142 48 1 076919 50 .225776 2 ** .1468 demons 96 1 645569 102 .062608 6 .6 ns .1270 Francis .795141 96 .841666 102 .046525 6 .
. Levels-of-growing-stock cooperative study in douglas-fir. Table 21—Test of hypothesis of common slopes, b and c, by installation, in regressions, IndD = a + bRD + cln(Hi/Hm) One regression, Separate Regression with Period regressions common slopes slope common slopes Study SS 1/ df 2/ SS 1/ df 2/ SS XJ df 2/ F-test 3/ 4/ SEElndD Skykomish 100 0 501773 106 6 ns Hoskins .379595 95 396767 101 .017172 6 .7 ns .0627 Rocky Brook .851142 48 1 076919 50 .225776 2 ** .1468 demons 96 1 645569 102 .062608 6 .6 ns .1270 Francis .795141 96 .841666 102 .046525 6 .9 ns .0908 Iron Creek .541484 72 .582634 76 .041151 4 ns .0876 Sayward .219347 48 241476 50 .022129 2 ns .0695 1/ SS = sum of squares. 21 df = degrees of freedom. 3/ F = (SS, separate slopes)/(df, separate slopes) _ MS, separate slopes . (SS, period regressions)/(, periods) MS, period regressions 4/ ns = p > ; ** = p < 5/ SEE IndD = standard error of IndD. r O in Q tr D Q TJ 10 20 30 40 RD 50 60 70 80 Figure 28.—Comparison of shapes of installation curves (IndD = a, + bRD + cln(Hi Hm)) fitted with common slopes for all periods within a single installation. Estimates expressed as ratios of estimated dD to expected dD for RD50. O 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 Northwest Forest and Range Experiment Station
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