Lecture+2+SU2010+_reliability-validity-causality-frequency+dist_

Lecture+2+SU2010+_reliability-validity-causality-frequency+dist_

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02/23/11 Soc 210 Summer 2010 1 Sociology 210 Reliabilty, Validity, and Causality; Frequency Distributions
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02/23/11 Soc 210 Summer 2010 2 What is the Unit of Analysis in the following research questions? A) Urbanization Rate B) Revolutions C) Revolutionaries (individuals) D) Nations Does Urbanization lead to Social Revolution?
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02/23/11 Soc 210 Summer 2010 3 What Scale of Measurement is the following variable? A) Nominal B) Ordinal C) Interval D) Ratio Proportion of votes for independent candidates
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02/23/11 Soc 210 Summer 2010 4 What Scale of Measurement is the following variable? On a scale of 1 to 5, how much do you want to attend college? A) Nominal B) Ordinal C) Interval D) Ratio
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02/23/11 Soc 210 Summer 2010 5 Review of Research Process Theory Hypotheses Data Collection Data Analysis Results Deduction Induction Conceptualization Operationalization Validity and Reliability of measurement critical in this step Causal Inference critical in this step
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02/23/11 Soc 210 Summer 2010 6 Reliability Reliability : The extent to which a measuring procedure yields the same results on repeated trials Reliability Assessment: Test-retest (correlate results) Multiple measures (correlate results) Example: measuring “computer anxiety” “I feel very negative about computers in general.” “I enjoy using computers.” Inter-coder reliability
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02/23/11 Soc 210 Summer 2010 7 Validity Validity : Does the instrument measure the concept/construct that it is intended to measure? Validity Assessment Compared to detailed criterion Relationships with other variables There is much, much more information regarding different types of validity that we will not cover in this course. A more detailed discussion of validity can usually be found in courses on research methods.
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02/23/11 Soc 210 Summer 2010 8 Reliability vs. Validity Reliability Does scale give you the same weight every time, or does it change with time? Is a clock/watch working correctly – is it counting seconds accurately Does person throwing darts hit the same spot on a dartboard time after time Validity Has scale been calibrated to give you the correct weight Is clock/watch set to the correct time Does person throwing darts hit the spot s/he is aiming for (e.g., the “bull’s-eye”)
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02/23/11 Soc 210 Summer 2010 9 External Validity Previous discussion of validity referred to characteristics of measurement External validity refers to generalizability of results The degree to which the conclusions in your study would hold for other persons in other places and at other times Importance of Sampling
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Soc 210 Summer 2010 10 External Validity Some threats to external validity Unusual time Unusual context
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Lecture+2+SU2010+_reliability-validity-causality-frequency+dist_

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