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Table II
Parameters of the sigmoid function (A, upper asymptote; κ, rate of change; Ti, x-axis placement of the inflection point) and R2 for models fitted by nonlinear regressions with tree height and stem volume of black spruce in stands within and north of the commercial forest in Quebec, Canada. Values in parentheses represent the standard error of the estimated parameters.
| Variable | Stand | A | κ (10-2) | T i | R 2 |
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| Height | Northern | 14.30 (0.11) | 2.82 (0.06) | 41.30 (0.47) | 0.82 |
| Southern | 16.73 (0.16) | 2.88 (0.06) | 44.02 (0.49) | 0.88 | |
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| Volume | Northern | 143.70 (4.05) | 3.00 (0.17) | 73.28 (1.37) | 0.49 |
| Southern | 242.62 (12.18) | 2.46 (0.14) | 79.86 (2.41) | 0.66 | |