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From |
Scott Merryman <scott.merryman@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: Again the requrest: SIMULATION TO INTERPRET AND PRESENT LOGIT RESULTS without formatting - hopefully looks better |

Date |
Fri, 2 Mar 2012 15:20:33 -0600 |

On Fri, Mar 2, 2012 at 11:02 AM, Alexander M. Jais <jais@win.rwth-aachen.de> wrote: <snip> * How do I code the Interaction Variable and Independent Variable, which are NOT binary – the explanation in Zellner shows only the binary interaction term (see lines 3, 10, … in Do file below; based on Zellner 2009, also attached, see pages 21-23) ? * Why is in line 8 all independent variables set to zero? <snip> 1. How do you want to code the interaction of two ordinal variables? In the example below using two continuous variables, mpg is allowed vary over a range of values while gear_ratio is set at the minimum or maximum value. 2. From page 10 of the paper: "The ambivalent firm, as defined by Hoetker (2007b), is modeled by setting the values of the independent variables other than asset specificity and demand uncertainty to zero, and serves as a useful illustration because the predicted probabilities for this hypothetical firm vary substantially..." Example: sysuse auto, clear gen mpggear= mpg*gear estsimp logit fore mpg gear price mpggear foreach var in X Y0 Y1 Y0lb Y1lb Y0ub Y1ub dY dYlb dYub { gen `var' = . } setx price mean qui { forvalues obs = 20(1)40 { replace X = `obs' in `obs' setx mpg `obs'+1 foreach as_lev in 0 1 { if `as_lev' == 0 { qui sum gear local gear_lev = r(min) } if `as_lev' == 1 { qui sum gear local gear_lev = r(max) } setx gear `gear_lev' mpggear `gear_lev'*`obs' simqi, genpr(Y`as_lev'_tmp) prval(1) sum Y`as_lev'_tmp, meanonly replace Y`as_lev' = r(mean) in `obs' _pctile Y`as_lev'_tmp, p(2.5, 97.5) replace Y`as_lev'lb = r(r1) in `obs' replace Y`as_lev'ub = r(r2) in `obs' } drop *_tmp } } twoway rbar Y0ub Y0lb X, mw msize(1) lcolor(gs12) fcolor(gs16) /// || line Y0 X, color(gs12) /// || rspike Y1ub Y1lb X, color(gs0) lp(dot) /// || line Y1 X, color(gs0) /// || , yscale (r(0 1)) ylabel(0(.2)1) /// legend(order(2 "Minimum Gear Ratio" 4 "Maximum Gear Ratio") size(*.7)) /// xtitle("MPG") ytitle("Probility of Foreign Origin") graphregion(fcolor(gs16)) Scott * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: Again the requrest: SIMULATION TO INTERPRET AND PRESENT LOGIT RESULTS without formatting - hopefully looks better***From:*"Alexander M. Jais" <jais@win.rwth-aachen.de>

**Re: Again the requrest: SIMULATION TO INTERPRET AND PRESENT LOGIT RESULTS without formatting - hopefully looks better***From:*"Alexander M. Jais" <jais@win.rwth-aachen.de>

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