Figure 1.
Figure 2.
Figure 3.
F-test statistics for timber sales and associated variables at α = 5% level of significance
| Modela | Sum of squares | df | Mean square | F | p-value |
|---|---|---|---|---|---|
| Regression | 612.182 | 4 | 153.045 | 100.072 | 0.000(b)++ |
| Residual | 601.037 | 393 | 1.529 | ||
| Total | 1213.219 | 397 |
Response of timber sales to demand, cost, stored quantity and spoiled quantity of timber in selected timber markets of Plateau State
| Modela | R | R2 | Adjusted R2 | Std error of the estimate |
|---|---|---|---|---|
| 1 | 0.710b | 0.505 | 0.500 | 1.237 |
Pairwise PPMC of cost per timber, demand, quantity of timber stored and quantity spoiled with timber sales in selected timber markets of Plateau State
| PPMC | Cost per timber | Demand for timber | Stored timber species | Spoiled timber species |
|---|---|---|---|---|
| Timber sales | 0.381 | 0.634 | 0.592 | 0.265 |
Demand for timber species by pieces demanded monthly in selected timber markets of Plateau State
| Timber species | 1–100 pieces | 101–200 pieces | 201–300 pieces | 301–400 pieces | 401–500 pieces | Above 500 pieces | Total | % demands from consumers |
|---|---|---|---|---|---|---|---|---|
| Khaya senegalensis (mahogany) | 35 | 52 | 43 | 7 | 13 | 29 | 179 | 44.8 |
| Triplochiton scleroxylon (obeche) | 12 | 24 | 15 | 10 | 0 | 9 | 70 | 17.5 |
| Prunus avium (cherry) | 3 | 5 | 3 | 0 | 0 | 1 | 12 | 3.0 |
| Milicia excels (iroko) | 5 | 7 | 4 | 1 | 2 | 5 | 24 | 6.0 |
| Betula pendula (birch) | 0 | 1 | 0 | 0 | 1 | 2 | 4 | 1.0 |
| Quercus robur (oak) | 2 | 0 | 0 | 0 | 0 | 4 | 6 | 1.5 |
| Juglans regia (walnut) | 0 | 1 | 0 | 0 | 0 | 1 | 2 | 0.5 |
| Cedrus deodara (cedar) | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0.3 |
| Others | 5 | 14 | 37 | 11 | 3 | 32 | 102 | 25.5 |
| Total | 62 | 105 | 102 | 29 | 19 | 83 | 400 | 100.0 |
t-test statistics of timber sales when associated with predictor variables
| Modela | B | Std error | Beta | t | p-value | Lower bound | Upper bound |
|---|---|---|---|---|---|---|---|
| (constant) | 0.346 | 0.193 | 1.788 | 0.074 ++ | 0.034 | 0.725 | |
| Cost per timber | 0.160 | 0.055 | 0.114 | 2.898 | 0.004++ | 0.051 | 0.268 |
| Demand for timber | 0.413 | 0.044 | 0.407 | 9.322 | 0.000++ | 0.326 | 0.500 |
| Stored timber | 0.287 | 0.042 | 0.307 | 6.895 | 0.000++ | 0.205 | 0.369 |
| Spoiledtimber | 0.087 | 0.040 | 0.081 | 2.177 | 0.030++ | 0.008 | 0.165 |