EPID 301 Lecture Notes - Lecture 5: Standardized Mortality Ratio, Stratified Sampling, Confounding

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{selection error in descriptive studies: sources of error. Flaws in study design (lawed measurement leading to misclassiication) Flaws in study design (lawed sampling procedures that choose participants) Other factors related participation (e. g. , subjects withdrawing from a study) Systematic error can lead to bias whereas random error don"t: selection error. Selection error results from procedures used to select or retain study subjects. This can lead to a result diferent from what would have been obtained from the entire population (bias) Flaws in the study design (flawed sampling procedures) Factors related to participation (participant non-consent, participant withdrawal, missing data) Selection errors selection bias (systematic error resulting from factors (ie. , study design, participation) that afect who participates in an epidemiologic study: sampling terminology. Sampling frame: a list of all elements in the population from which the sample will be drawn (ex. The individual participant or object from which the measurement is taken. You wish to sample employees from a workplace.

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