DoctorVisits {AER} | R Documentation |
Cross-section data originating from the 1977–1978 Australian Health Survey.
data("DoctorVisits")
A data frame containing 5,190 observations on 12 variables.
Journal of Applied Econometrics Data Archive.
http://www.econ.queensu.ca/jae/1997-v12.3/mullahy/
Cameron, A.C. and Trivedi, P.K. (1986). Econometric Models Based on Count Data: Comparisons and Applications of Some Estimators and Tests. Journal of Applied Econometrics, 1, 29–53.
Cameron, A.C. and Trivedi, P.K. (1998). Regression Analysis of Count Data. Cambridge: Cambridge University Press.
Mullahy, J. (1997). Heterogeneity, Excess Zeros, and the Structure of Count Data Models. Journal of Applied Econometrics, 12, 337–350.
data("DoctorVisits") library("MASS") ## Cameron and Trivedi (1986), Table III, col. (1) dv_lm <- lm(visits ~ . + I(age^2), data = DoctorVisits) summary(dv_lm) ## Cameron and Trivedi (1998), Table 3.3 dv_pois <- glm(visits ~ . + I(age^2), data = DoctorVisits, family = poisson) summary(dv_pois) ## MLH standard errors coeftest(dv_pois, vcov = vcovOPG) ## MLOP standard errors logLik(dv_pois) ## standard errors denoted RS ("unspecified omega robust sandwich estimate") coeftest(dv_pois, vcov = sandwich) ## Cameron and Trivedi (1986), Table III, col. (4) dv_nb <- glm.nb(visits ~ . + I(age^2), data = DoctorVisits) summary(dv_nb) logLik(dv_nb)