Prelim2_Review

Prelim2_Review - PAM 210 Second Prelim Review hollis e...

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PAM 210 Second Prelim Review hollis e. cornell auditorium, goldwin smith hall (arts quad on east ave)
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Different Types of Samples Book covers five (one very general) Probability Sample Simple Random Sample Stratified Random Sample Multistage Sample Voluntary Response Sample
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Characteristics of a “good” random sample Subjects should not control whether or not they are in the sample (voluntary response) Representative sample Can’t make inferences about cats by looking at dogs Know probabilities of each person being in sample Inclusion in sample NOT conditional on response variable (ex: wage) Large enough n to reasonably appeal to central limit theorem
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Characteristics of a “good” experiment Control and Treatment groups (variation in explanatory variable) Treatment randomly assigned Double blind Based on a “good” sample
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Internal and External Validity Internal Validity: your estimate is biased or lacks precision
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This note was uploaded on 02/10/2009 for the course PAM 210 taught by Professor Abdus,s. during the Spring '08 term at Cornell.

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Prelim2_Review - PAM 210 Second Prelim Review hollis e...

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