Variance components between neighbourhoods | Parameter | Variance estimate (μ) | SD | df | χ2 | p value |
---|---|---|---|---|---|---|
Intercept | μ0 | Constrained to zero | – | – | – | – |
BMI (centred) | μ1 | 0.018 | 0.13 | 51 | 84.44 | 0.002 |
Within neighbourhood fixed effects | Parameter | Coefficient | SE | t ratio | p value | |
---|---|---|---|---|---|---|
Intercept | γ00 | 0.26 | 0.059 | 4.31 | 0.0001 | |
Age | γ20 | −0.013 | 0.006 | −2.08 | 0.038 | |
Individual affluence* | γ30 | −0.21 | 0.22 | −0.98 | 0.33 |
Between neighbourhood effects | Parameter | Coefficient | SE | t ratio | p value | |
---|---|---|---|---|---|---|
*Individual affluence = dummy variable: “low income” (≤$20000) v not (>$20000); †neighbourhood affluence = centred variable: mean average family income across census tract boundary. | ||||||
Intercept | γ10 | 0.27 | 0.027 | 10.15 | 0.0001 | |
Neighbourhood affluence† (centred) | γ11 | 0.000002 | 0.000001 | 2.59 | 0.013 | |
Final model | ||||||
Level-1 | Body satisfaction = β0 + β1 (BMI) + β2 (age) + β2 (individual affluence*) | |||||
Level-2 | β0 = γ00 | |||||
β1 = γ10 + γ11 (neighbourhood affluence†) + μ1 | ||||||
β2 = γ20 | ||||||
β3 = γ30 |