poli 110 mar. 27

# poli 110 mar. 27 - Mar 27 2014 Hold the passage of time...

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Mar. 27, 2014 Hold the passage of time constant by examining the correlation between X and Y across different cities at a single point in time Not wanting a time dimension, that’s an extra variable Multiple Regression Analysis allows us to control for multiple Z’s A statistical technique that controls multiple Z’s Examine correlation, holding Z’s constant What are the “Z’s”? The comparative method and multiple regression analysis – possible ways of dealing with spurious correlation Both require: o the researcher to know what all the relevant Z’s are o the researcher to have information about the Z’s for their relevant cases o their researcher should be able to measure the each Z for each case But, what if this is not the case? We can reply on ‘Random Assignment’ Assignment’ of Causes Causal Claim: Attending University (X) Causes Higher Future Earnings (Y) Each case represents an individual student How is Attending University (X)

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