File racd6.1st June 2000 This file describes all data for chapter 6 of A.C. Cameron and P.K. Trivedi (1998) REGRESSION ANALYSIS OF COUNT DATA Econometric Society Monograph No.30, Cambridge University Press. This file does not provide the programs. Instead a stata program to read in the data and estimate Poisson and negative binomial regressions is given. --------- Complete lists of chapter 6 files --------- racd6.1st Description of chapter 6 data and programs Racd6d1.asc Space-delimited ascii data set (physician office visits). Racd6d2.asc Formatted (and space-delimited) ascii data set (recreational trips). Racd6p1.do Stata program that reads in data from racd6d1.asc (physician office visits) Racd6p1.out Output from Stata program racd6p1.do Racd6p2.do Stata program that reads in data from racd6d2.asc (recreational trips). Racd6p2.out Output from Stata program racd6p2.do --------- Summary of chapter 6 data --------- There are two separate data sets - racd6d1.asc on physician office visits - racd6d2.asc on recreational trips data Also used in chapter 12 --------- Details on chapter 6 data for physician office visits --------- The physician office visits data are in ascii file racd6d1.asc There are 4406 observations on 22 variables with one lines per obs The data are free format separated by blanks See Table 6.2 p.194 of Cameron and Trivedi (1998) for variable descriptions The variables are ofp ofnp opp opnp emr hosp exclhlth poorhlth numchron adldiff noreast midwest west age black male married school faminc employed privins medicaid The data are extracted from the 1987-88 National Medical Expenditure Survey (NMES). The extract and analysis are in P. Deb and P.K. Trivedi (1997), Demand for Medical Care by the Elderly: A Finite Mixture Approach" Journal of Applied Econometrics, 12, 313-326. Variable | Obs Mean Std. Dev. Min Max ---------+----------------------------------------------------- ofp | 4406 5.774399 6.759225 0 89 ofnp | 4406 1.618021 5.317056 0 104 opp | 4406 .7507944 3.652759 0 141 opnp | 4406 .5360872 3.879506 0 155 emr | 4406 .2635043 .7036586 0 12 hosp | 4406 .2959601 .7463978 0 8 exclhlth | 4406 .0778484 .2679633 0 1 poorhlth | 4406 .1257376 .3315911 0 1 numchron | 4406 1.541988 1.349632 0 8 adldiff | 4406 .2040399 .4030441 0 1 noreast | 4406 .1899682 .3923203 0 1 midwest | 4406 .2625965 .4400949 0 1 west | 4406 .1811167 .3851585 0 1 age | 4406 7.402406 .6334051 6.6 10.9 black | 4406 .117113 .3215914 0 1 male | 4406 .4035406 .4906631 0 1 married | 4406 .5460735 .4979292 0 1 school | 4406 10.29029 3.738736 0 18 faminc | 4406 2.527132 2.924648 -1.0125 54.8351 employed | 4406 .1032683 .3043435 0 1 privins | 4406 .7764412 .4166769 0 1 medicaid | 4406 .0912392 .2879817 0 1 --------- Details on chapter 6 data for recreational trips --------- The Recreational trips data are in ascii file racd6d2.asc There are 659 observations on 8 variables with one lines per obs The data are fixed format with line 1 variables 1-8 5F7.0,3F11.0 The variables are 1: Number of boating trips to Lake Somerville, East Texas, in 1980 (TRIPS or V3) 2: Facility's subjective quality ranking (SO) 3: Respondent's taste for water-skiing (SKI) 4: Income - categorical variable (I) 5: Cost dummy variable; 1 if an annual user fee is paid at Lake somerville (FC3) 6: Travel cost to Lake Conroe (C1) 7: Travel cost to Lake Somerville (C3) 8: Travel cost to Lake Houston (C4) A detailed discussion of the variables can be found in C. Sellar, J.R. Stoll and J.P. Chavas (1985), "Validation of Empirical Measures of Welfare Change: A Comparison of nonmarket Techniques," Land Economics, 61, 156-175. Data used with permission of Sellar et al. (1985) And also T. Ozuna and I. Gomaz (1995) "Specification and Testing of Count Data Recreation Demand Functions," Empirical Economics, 20, 543-550. The analysis of these data in the count data book is based on S. Gurmu and P.K. Trivedi (1996) "Excess Zeros in Count Data Models for Recreational Trips" Journal of Business and Economics Statistics, 14, 469-477. "Multiple Bids as a Consequence of Target Management Resistance" Variable | Obs Mean Std. Dev. Min Max ---------+----------------------------------------------------- TRIPS | 659 2.24431 6.292475 0 88 SO | 659 1.418816 1.811986 0 5 SKI | 659 .3672231 .4824142 0 1 I | 659 3.852807 1.851937 1 9 FC3 | 659 .0197269 .1391657 0 1 C1 | 659 55.4237 46.68265 4.34 493.77 C3 | 659 59.92805 46.37668 4.767 491.547 C4 | 659 55.9903 46.13321 5.7 491.049