PPML regressions with iterations

[Adithya Kolloju]

Hi everyone,
i was trying to perform a regression with a gravity model. Mainly it includes data from 87 universities.
The commands are something like,

 foreach i of num 1/5 {
ppml TD2 uniorigin1 uniorigin2 uniorigin3 uniorigin4 uniorigin5 uniorigin6 uniorigin7 uniorigin8 uniorigin9 uniorigin10 uniorigin11 uniorigin12 uniorigin13 uniorigin14 uniorigin15 uniorigin16 uniorigin17 uniorigin18 uniorigin19 uniorigin20 uniorigin21 uniorigin22 uniorigin23 uniorigin24 uniorigin25 uniorigin26 uniorigin27 uniorigin28 uniorigin29 uniorigin30 uniorigin31 uniorigin32 uniorigin33 uniorigin34 uniorigin35 uniorigin36 uniorigin37 uniorigin38 uniorigin39 uniorigin40 uniorigin41 uniorigin42 uniorigin43 uniorigin44 uniorigin45 uniorigin46 uniorigin47 uniorigin48 uniorigin49 uniorigin50 uniorigin51 uniorigin52 uniorigin53 uniorigin54 uniorigin55 uniorigin56 uniorigin57 uniorigin58 uniorigin59 uniorigin60 uniorigin61 uniorigin62 uniorigin63 uniorigin64 uniorigin65 uniorigin66 uniorigin67 uniorigin68 uniorigin69 uniorigin70 uniorigin71 uniorigin72 uniorigin73 uniorigin74 uniorigin75 uniorigin76 uniorigin77 uniorigin78 uniorigin79 uniorigin80 uniorigin81 uniorigin82 uniorigin83 uniorigin84 uniorigin85 uniorigin86 uniorigin87 unidest1 unidest2 unidest3 unidest4 unidest5 unidest6 unidest7 unidest8 unidest9 unidest10 unidest11 unidest12 unidest13 unidest14 unidest15 unidest16 unidest17 unidest18 unidest19 unidest20 unidest21 unidest22 unidest23 unidest24 unidest25 unidest26 unidest27 unidest28 unidest29 unidest30 unidest31 unidest32 unidest33 unidest34 unidest35 unidest36 unidest37 unidest38 unidest39 unidest40 unidest41 unidest42 unidest43 unidest44 unidest45 unidest46 unidest47 unidest48 unidest49 unidest50 unidest51 unidest52 unidest53 unidest54 unidest55 unidest56 unidest57 unidest58 unidest59 unidest60 unidest61 unidest62 unidest63 unidest64 unidest65 unidest66 unidest67 unidest68 unidest69 unidest70 unidest71 unidest72 unidest73 unidest74 unidest75 unidest76 unidest77 unidest78 unidest79 unidest80 unidest81 unidest82 unidest83 unidest84 unidest85 unidest86 unidest87 PubperAS1 Rev1 Rev2 NE2 SR1 SR2 PhdsoverPoePA1 PhdsoverPoePA2 RevoverTAS1 RevoverTAS2 SRoverTAS1 SRoverTAS2 lnrevovertas1 lnrevovertas2 PhdsoverSR1 PhdsoverSR2 phdovertas1 phdovertas2 TSAA1 TSAA2 PAePOAA1 PAePOAA2 RTDeRUAA1 RTDeRUAA2 PubperAS2 TAS1 TAS2 POePA1 POePA2 PO1 PO2 PA1 PA2 RU1 RU2 RTD1 RTD2 Researchersorigin Researchersdestination PhdS1 PhdS2 Distance, strict
eststo reg_`i'
}

when I see the results, the Stata shows same results with same coefficients.
I would like to run certain iterations but it shows the same results.

I would like to see various results (coefficients) for the same type of regression with various significance level. Is there something that I can do for this?
Thank you all.

[Joao Santos Silva]

Dear Adithya Kolloju,

You are doing a loop over i but your estimation command does not contain any i (you only have i in the part about storing results), so you just estimate the same regression over and over again.

Best wishes,

Joao