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09_08+Measurement+-+Ch4 - Sociology SYA4300 Professor Rob...

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1 Sociology SYA4300 Professor Rob White Thursday (9/8) Research Design: Time in Data 1 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Time Dimensions in Research Design 2 Cross-sectional designs - data are gathered at one point in time “Cross - section” Time 1 Time 2 Time 3 Time 4 Time 5 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Time Dimensions in Research Design 3 Cross-sectional designs - data are gathered at one point in time 1. Is temporal ordering possible? (causality) 2. Period of data collection? (representativeness) ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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2 Time Dimensions in Research Design 4 Cross-sectional designs - data are gathered at one point in time Longitudinal designs - data are collected on two or more occasions ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Types of Longitudinal Designs 5 1. Repeated cross-sections monitor a characteristic of some population over time (e.g., “trend” studies; time series) Repeated on independently selected samples of the same population over time. Emphasis on population (not suitable for studying individual change). ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Types of Longitudinal Designs 6 1. Repeated cross-sections 2. Panel studies follow the same sample.
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