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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
c9 Â Use the data in CHARITY.RAW to answer the following questions:
(i)Â Â Â Â Â Â Estimate the equation
Â
gift 5 b0 1 b1mailsyear 1 b2 giftlast 1 b3 propresp 1 u
Â
by OLS and report the results in the usual way, including the sample size and
R-squared. How does the R-squared compare with that from the simple regression that omits giftlast and propresp?
Â
Â
(ii)Â Â Â Â Â Interpret the coefficient on mailsyear. Is it bigger or smaller than the correspond- ing simple regression coefficient?
(iii)Â Â Â Â Interpret the coefficient on propresp. Be careful to notice the units of measure- ment of propresp.
(iv)Â Â Â Now add the variable avggift to the equation. What happens to the estimated effect of mailsyear?
(v)Â Â Â Â Â In the equation from part (iv), what has happened to the coefficient on giftlast? What do you think is happening?
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