Variable Coeff. Robust Std. Err. dy/dx  Std. Err.
LN forward looking price *0.0829 0.0357 *0.1821 0.0783
LN HH income 0.0086 0.0171 0.0189 0.0375
HH size *0.0154 0.0049 *0.0339 0.0107
Disadvantaged group -0.0180 0.0255 -0.0395 0.0561
Married 0.0036 0.0506 0.0080 0.1112
Beliefs -0.0202 0.0348 -0.0442 0.0758
Information index *-0.0036 0.0012 *-0.0079 0.0026
Age  **0.0065 0.0035 *0.0143 0.0077
Age squared *-0.0001 0 *-0.0003 0.0001
Male -0.0093 0.0256 -0.0205 0.0564
Literate *-0.0740 0.0319 *-0.1612 0.0687
healthy days *-0.0244 0.002 *-0.0537 0.0044
Constant *8.3211 0.7612    
Number of obs = 367.00 No problem of over dispersion
Wald chi2(12) = 356.32
Prob > chi2 = 0.00  
Pseudo R2 = 0.07  
Log pseudolikelihood = -513.59  
*P<0.01 **P<0.10 Source: Estimated using survey data
Table 2: Results of maximum likelihood estimation and marginal change.