Hello Statalist,
I need your help with the following.
I am running an ivprobit command for a continuous endogenous variable (D) that has a curvilinear effect. I instrumented both the linear and quadratic terms of D on two exogenous variables BSize (continuous) and FC (binary).
gen D2= D^2
ivprobit SOF ControlVars (D D2= BSize FC) i.Year i.industry, vce(cluster Tickernum)
A summary of the long output is presented below:
I estimated the marginal effects using this command:
margins, dydx(D D2) atmeans
The reported marginal effects for D and D2 are 0.186** and -0.004**, respectively.
But when I tried to verify the inverted U-shape using utest, stata reports that D not found. r(111).
My question is: can I use utest after the ivprobit command? if not, how can I verify the inverted U-shape or V-shape here?
Kind Regards
Lyle
I need your help with the following.
I am running an ivprobit command for a continuous endogenous variable (D) that has a curvilinear effect. I instrumented both the linear and quadratic terms of D on two exogenous variables BSize (continuous) and FC (binary).
gen D2= D^2
ivprobit SOF ControlVars (D D2= BSize FC) i.Year i.industry, vce(cluster Tickernum)
A summary of the long output is presented below:
| 1st Stage | 2nd Stage | ||
| D | D2 | SOF | |
| BSize | 0.278* | 3.262 | |
| (0.161) | (8.110) | ||
| FC | 6.750*** | 352.924*** | |
| (1.463) | (88.784) | ||
| D | 0.186** | ||
| (0.075) | |||
| D2 | -0.004** | ||
| (0.002) | |||
| Constant | 6.109** | 53.321 | -6.076*** |
| (2.542) | (129.891) | (0.933) | |
| Year controls | Yes | Yes | Yes |
| Industry controls | Yes | Yes | Yes |
| Contol Vars | Yes | Yes | Yes |
| /athrho2_1 : corr(e.D2,e.D) | -0.023 | ||
| (0.370) | |||
| /athrho3_1: corr(e.D,e.SOF) | 0.185 | ||
| (0.394) | |||
| /athrho3_2: corr(e.D2,e.SOF) | 1.740*** | ||
| (0.034) | |||
| /lnsigma2 : SD (D) | 2.159*** | ||
| (0.026) | |||
| /lnsigma3 : SD (D2) | 6.129*** | ||
| (0.041) | |||
| # Observations | 2124 | 2124 | 2124 |
| Wald χ2 | 269.48*** | ||
| Wald test of exogeneity | χ2(1): 6.88; Prob> χ2 = 0.0320 | ||
margins, dydx(D D2) atmeans
The reported marginal effects for D and D2 are 0.186** and -0.004**, respectively.
But when I tried to verify the inverted U-shape using utest, stata reports that D not found. r(111).
My question is: can I use utest after the ivprobit command? if not, how can I verify the inverted U-shape or V-shape here?
Kind Regards
Lyle
