14.33 Pset 1_Judy Hao - 14.33 Pset 1 Ziwei Hao ProblemSet1...

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14.33 Pset 1 Ziwei Hao Problem Set 1 1. Graph dimr7271 against damtsp1.   a) Does it look like there is an association between changes in infant mortality and tsps?  scatter  dimr7271 damtsp1 b) A nice feature in Stata is that it allows for the size of the points on a graph to vary  with a variable; this is done by setting the weight = the variable of interest.  Now  graph dimr7271 against damtsp1 and set weight equal to tbirth1.  Does there appear  to be a relationship? (It is easier to see the graph if you use hollow markers rather  than filled in ones.)  scatter  dimr7271 damtsp1 [w=tbirth1], msymbol(Oh) Page 1 The data forms a non-linear  cluster near x-variable = 0.  There is no obvious  relationship between changes  in infant mortality and tsps.  We   still   don’t   see   much   of   a  pattern in the two variables (still  just a cluster at x = 0). However,  the   lack   of   pattern   may   be  attributed   to   omitted   variable  bias, since we can see from the  weighted   graphs   that   there   are  very   large   differences   between  the countries with higher births. 
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14.33 Pset 1 Ziwei Hao 2. We now want to prove the robustness of the findings in 1.   Regress dimr7271 on  damtsp1.   a)   Is there evidence of a relationship here?  regress dimr7271 damtsp1 [w=tbirth1], robust Based on the R-squared (nearly zero) and the nonsignificant negative coefficient,  the OLS suggests a lack of relation between the two variables. This is true even after  we weigh counties by total number of births.  b) Now add the “Basic Natality” control variables.  Are any of these variables important  determinants of infant mortality?   Page 2
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14.33 Pset 1 Ziwei Hao regress dimr7271 damtsp1 dwhite dothr dfemale dedudad dedumom dmaried  dagemom dpcare0 dpcare2 dpcare3 dpcare4 [w=tbirth1], robust How that we have added additional variables to see there may be other factors correlated to  infant mortality that are attributing changes in tsps. By controlling for these factors, we can  better try to reduce OVB. The coefficient on change in tsps is still not significant. What are  significant are the coefficeints for dwhite (an increased percentage of white mothers leads to a  more negative change in infant mortality) and dothr (an increased percentage of mothers who  are neither white nor black leads to a more negative change in infant mortality).
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  • Fall '12
  • ORLIN
  • Ziwei Hao

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