Table 3 Summary of the selection process of the environmental variables and the fitting statistics of the forward stepwise regression
From: Alternative approaches to assessing the natural regeneration of Scots pine in a Mediterranean forest
Model | Fixed effects | Random effect | Log-likelihood | Compared to model | Pr > (Chi) |
|---|---|---|---|---|---|
(0) | Intercept | – | −543.56 | – | – |
(1) | Intercept | Plot | −512.74 | (0) | <0.001 |
(2) | Intercept | Plot/transect | −512.40 | (1) | 0.4124 |
(3) | Na | Plot | −508.77 | (1) | 0.0048 |
(4) | Na, P | Plot | −506.45 | (3) | 0.0312 |
(5) | Na, P, altitude | Plot | −504.71 | (4) | 0.0663 |
(6) | Na, P, GSF | Plot | −505.10 | (4) | 0.0999 |
(7) | Na, P, slope | Plot | −505.33 | (4) | 0.1340 |
(8) | Na, P, pH | Plot | −506.44 | (4) | 0.8993 |
(9) | Na, P, IPOT | Plot | −505.24 | (4) | 0.1201 |
(10) | Na, P, INF | Plot | −505.31 | (4) | 0.1305 |
(11) | Na, P, organic matter | Plot | −506.29 | (4) | 0.5668 |
(12) | Na, P, Mg | Plot | −505.67 | (4) | 0.2114 |
(13) | Na, P, Ca | Plot | −505.29 | (4) | 0.1272 |
(14) | Na, P, K | Plot | −506.34 | (4) | 0.6375 |
(15) | Na, P, stumps | Plot | −501.28 | (5) | 0.0013 |
(16) | Na, P, stumps, trees | Plot | −501.21 | (15) | 0.7043 |
(17) | Na, P, stumps, Ln(electric conductivity) | Plot | −499.83 | (15) | 0.0889 |
(18) | Na, P, stumps, clay | Plot | −501.27 | (15) | 0.8580 |
(19) | Na, P, stumps, sand | Plot | −501.26 | (15) | 0.8415 |
(20) | Na, P, stumps, silt | Plot | −501.28 | (15) | 0.9383 |
(21) | Na, P, stumps, stoniness | Plot | −449.62 | (15) | 0.0681 |
(22) | Na, P, stumps, Na*stumps | Plot | −501.28 | (15) | 0.9643 |
(23) | Na, P, stumps, Na*P | Plot | −501.23 | (15) | 0.7567 |
(24) | Na, P, stumps, stumps*P | Plot | −501.24 | (15) | 0.7773 |