References
- Chitwood D. D., Chitwood J. S. Treatment program clients and emergency room patients: A comparison of two drug-using samples. Int. J. Addict 1981; 16(5)911–925
- Des Jarlais D. C., Uppal G. S. Heroin activity in New York City, 1970–1978. Am. J. Drug Alcohol Abuse 1980; 7(3 & 4)335–346
- Duncan O. D., Cuzzort R. P., Duncan B. Statistical Geography: Problems in Analyzing Areal Data. Free Press, New York 1961
- Du Pont R. L., Greene M. H. The dynamics of a heroin addiction epidemic. Science 1973; 1981: 716–722
- Flaherty E. W., Olsen K., Bencivengo M. Predicting changes in drug use and treatment entry for local programs: A case study. Am. J. Drug Alcohol Abuse 1980; 7(1)31–48
- Fox E., Kotranski L., Flaherty E. W. The use of indigenous field interviewers for semi-ethnographic survey research on urban drug abusers. Paper presented at Eastern Sociological Society, Philadelphia, Pa, March, 1982
- Hannan M., Burstein L. Estimation fiom grouped observations. Am. Soc. Rev 1974; 39: 374–392
- Johnston R. J. Residential area characteristics: Research methods for identifying urban sub-areas-Social area analysis and factorial ecology. Social Areas in Cities: Special Processes and Forms, D. T. Herbert, R. J. Johnston. Wiley, New York 1976
- Langbein L. I., Lichtman A. J. Ecological Inference. Sage Publications, Beverly Hills, CA 1978
- Mc Lellan A. T., O'Brien C. P., Luborsky L., Woody G. E. Certain types of substance abuse patients do better in certain kinds of treatment. Problems of Drug Dependence. National Institute on Drug Abuse Research Monograph 34, U.S. Government Printing Office, Washington, DC 1981
- Newmeyer S. A. After the aquarian age: Observations on the changing face of heroin addiction in a San Francisco clinic population. Am. J. Drug Alcohol Abuse 1974; 1(2)199–206
- Person P. H., Retka R. L., Woodward J. Toward a Heroin Problem Index-An analytical model for drug abuse indicators. 1976, National Institute on Drug Abuse Technical Paper
- Person P. H., Retka R. L., Woodward J. A method for estimating heroin use prevalence. 1977, National Institute on Drug Abuse Technical Paper
- Philadelphia Health Management Corporation. Correlates of Drug Use and Treatment Entry Final Report. March, 1981, Division of Research and Evaluation
- Riley W. J., Wagenfeld M. O., Sonnad S. Triangulated investigating: An approach to the estimating of the extent of heroin use. Int. J. Addict 1981; 16(1)97–108
- Robinson W. S. Ecological correlations and the behavior of individuals. Am. Soc. Rev 1950; 15: 351–357
- Rutledge P. J., Seder P. Opiate Addiction and Urban Conditions: A Social Indicator Analyses. United States Conference of Mayors. 1975. National League of Cities, Washington, DC
- Schlenger W. E., Greenberg S. W. Characteristics of cities and their relationship to heroin use: An analysis of heroin use correlates in metropolitan areas. Int. J. Addict 1980; 15: 1141–1168
- Tannenbaum A. S., Bachman J. Structural versus individual effects. Am. J. Soc 1964; 69: 585–595
- Tryon R. C., Bailey D. E. Ouster Analysis. McGraw-Hill, New York 1970
- Valkonen T. Secondary analysis of survey data with ecological variables. Soc. Sci. Inf 1969; 8: 33–36