Raters are really bad at rating employees This can do away with some biases in

Raters are really bad at rating employees this can do

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Raters are really bad at rating employees. This can do away with some biases in self report but still has problems Halo effect - tendency of ratings of one positive characteristics to spill over to influence to rating of other characteristics. Reverse halo - negative ratings spill over Ex: one time she took my parking spot, so she sucks and she's a bad employee Random Selection The key to finding generalizability(external validity) in surveys and questionnaire studies Ensures every person in a population has an equal chance of being chosen to participate. Evaluating measures Note: the word “test” is referring to any measurement operation Good Measurements need to have 3 things: Reliability There's only one kind of reliability, but several ways to measure it. Does your measurement measures things consistently? Will it measure the same way a day from now? A few days from now? A week from now? You can not have a valid test without reliability 3 major domains: Time People (graders, raters, judges, etc.) Items The most common domain we’re interested in is Time . Ways of measuring: Test-retest reliability Item reliability Parallel-forms of reliability Alternate-forms reliability Validity Does the test measure things accurately? Is it measuring your construct? Validity is basically the accuracy of the test. Specifically: validity = how accurate is the test for what it was designed to measure?
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Utility Does the test measure things economically? It is useful? Does it take 17 hours per person? Does it cost a lot? 2/6 Correlational designs Explain how variables are related Can range from -1 to +1 Positive - as one increase so does the other Negative - as one decreases the other decreases Zero - no relationship between variables Scatterplots are a way correlation between variables.
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  • Fall '17
  • CindyPury
  • Causality, Correlational

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