Table 2.
Correlations among demand indices and marijuana use by marijuana grade.
| Marijuana grade |
Variable | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|---|
| Low Mid High |
1. Breakpoint | -- | -- | -- | -- | -- | -- |
| 2. Intensity of demand (observed) |
.09† .08† .07 |
-- | -- | -- | -- | -- | |
| 3. Omax (observed) | .65*** .59*** .48*** |
.46*** .45*** .55*** |
-- | -- | -- | -- | |
| 4. Pmax (observed) | .75*** .71*** .58*** |
−.17 −.23*** −.43*** |
.54*** .43*** .17** |
-- | -- | -- | |
| 5. Elasticity of demand | .37*** .69*** .60*** |
.03 −.13** −.36*** |
.06 .38*** .18*** |
.07 .66*** .69*** |
-- | -- | |
| 6. Grams/week of marijuana | .01 −.03 .01 |
.30*** .33*** .25*** |
.23*** .27*** .25*** |
−.05 −.07 −.05 |
−.05 −.07 .06 |
-- |
Simple average (i.e., observed) values for Intensity of demand, Omax, and Pmax from the overparameterized model were used. For low grade marijuana, Omax was square-root transformed and Pmax was common log-transformed. For mid grade marijuana, Omax was square-root transformed. For high grade marijuana, Omax was square-root transformed and Intensity of demand was common log-transformed. For each grade of marijuana, the absolute value of Elasticity of demand was common log-transformed, then the result was multiplied by −1 to retain the variable’s original direction. Due to skew, grams per week of marijuana was square-root transformed. All significance tests are two-tailed.
p < .10.
p < .05.
p < .01.
p < .001.