Study Designs part1

Epidemiological Research
Population-based (field) research: study of distribution, determinants, control measures of health-related phenomena in
Data Collection Methods Primary: where the investigator is the first to collect the data. Sources include: medical examinations, interviews, observations, etc. Merits: less measurement error, suits objectives of the study better. Disadvantage: costly, may not be feasible.chosen populations, followed by application of suitable biostatistical techniques which may allow generalization of results
Epidemiological Research
Population-based (field) research: study of distribution, determinants, control measures of health-related phenomena in
Data Collection Methods Primary: where the investigator is the first to collect the data. Sources include: medical examinations, interviews, observations, etc. Merits: less measurement error, suits objectives of the study better. Disadvantage: costly, may not be feasible.chosen populations, followed by application of suitable biostatistical techniques which may allow generalization of resultsData Collection Methods
Secondary: where the data is collected by OTHERS, for other purposes that those of the current study. Sources include: individual records (medical / employment); group records (census data, vital statistics)