Comparing Logit & Probit Coefficients…Richard Williams, ASA 2012 Page 5 In Stata, heterogeneous choice models can be estimated via the user-written routine oglm. If the models were multinomial logistic regressions, you could compare two or more groups using a post estimation command called suest in stata. Login or Register. > > Unfortunately, y is truncated in my data and z is a dummy and thus a probit > will > be a better choice. Test equality between coefficients in STATA. gsem is a very flexible command that allows us to fit very sophisticated models. Acock also covers a variety of commands available for evaluating reliability and validity of measurements. The most important, it … It seems that 'suest' command does not work with 'xtreg'. The fourth edition of the book has been updated to include new features in Stata 13. Home; Forums; Forums for Discussing Stata; General; You are not logged in. Spearman’s rho: This is the Spearman correlation coefficient. Is there any other way to compare between male and female parameters? In Stata you can use suest and test to do it. I actually don't know if this is totally legitimate but it seems to work (I know, hardly the reassurance you are looking for, but I believe this is okay and would happily stand corrected if it isn't). However, it is also useful in situations that involve simple models. You can browse but not post. I have seen a guide to do that using Stata suest but only applies to one independent variable model. Comparing the coefficients between models does not suggest substantial differences. Solution 2: Try suest. Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org. I know that - suest - does not work with xtreg, so I considered the "demean your data by hand" method as suggested by Prof. Schaffer in the old forum. If you concluded that they are not equal, then it is obvious from inspection that sranklow is the bigger of the two. And I want to test if the coefficients are significantly different for both group. Various selection criteria, such as semipartial correlations, are discussed for model selection. Methodology and Stata Journal) shows promise According to KHB, their method separates changes in coefficients due to rescaling from true changes in coefficients that result from adding more variables to the model (and does a better job of doing so than y-standardization and other alternatives) Race is of course nominal, and income and age are binned as well, but I treat the income bins as a linear effect. qui xtlogit Iy x1 x2 if q==5,i(isub) nolog . Dear Stata Forum, I was trying to compare (or test the equality of) the coefficients 1. of the same specification (using 'xtreg') but for male and female samples using 'estimates store' and then 'suest' command. est store q5 . (Also, note that if you use non-linear transformations or link functions (e.g., as in logistic, poisson, tobit, etc. We can formally test that coefficients are the same for the full model m1 and the restricted models m2 and m3 by using the hausman command. Re: Comparing coefficient across two xtmixed (growth curve) models Hi Lance, You could try a (pseudo-) multivariate model. Comparing coefficients across logit and probit models In linear regression, the concept of controlling for possible confounding variables is well understood and has great practical value. . The suest statements performs seeming unrelated regression on both group1 and group2 with clustered standard errors and then tests the equality of coefficients. Statistical methods are developed for comparing regression coefficients between models in the setting where one of the models is nested in the other. Likewise, the coefficient of salary is the slope of the baseline company, and the coefficient of salary_d is the deviation of the comparison group's slope from the baseline slope. Related to Sharon's question, I have a similar problem, where I want to estimate the covariance between estimated regression coefficients obtained under clustering, but for two different indicator variables with the same predictors: . If the coefficients themselves (rather than the variables) have an asymptotic normal distribution then you should be able to use t-tests. Ask Question Asked 2 years, 1 month ago. xtreg y1 x i.z xtreg y2 x i.z I want to check whether the βs are significantly different. März 2010 21:40 To: [hidden email] Subject: st: using estimate store + suest+test to compare regression coefficients between two samples, how to adjust for clustering Dear Statalist, I use "estimates store + suest + test" to compare regression coefficients between two samples. My first thought would be to use something along the lines of sureg or suest combined with lincom, but I can't quite figure out a way to make it work. Cite. sureg and suest do not work with ivregress(as far as I'm concerned), and with lincom I can't find a way to access the coefficients and their standard errors. See article by Mize et al (2019) in Sociological Methodology. Note, however, that the formula described, (a-c)/(sqrt(SEa^2 + SEc^2)), is a z-test that is appropriate for comparing equality of linear regression coefficients across independent samples, and it assumes both models are specified the same way (i.e., same IVs and DV). From Thorhildur Olafsdottir To "statalist@hsphsun2.harvard.edu" … I found that 'suest ' of Stata is a very useful command for comparing regression coefficients between different (separated) regression models EASILY. Suest stands for seemingly unrelated estimation and enables a researcher to establish whether the coefficients from two or more models are the same or not. Also, you can compare marginal effects. It's the block of code from suest down that I cannot figure out in SAS. This is, in effect, testing if the estimated parameters from the first regression are statistically different from the estimated parameters from the second regression: qui xtlogit Iy x1 x2 if q==6,i(isub) nolog . I have understood that suest does not work with reghdfe. I have seen a guide to do that using Stata suest but only applies to one independent variable model. Below, we have a data file with 10 fictional females and 10 fictional males, along with their height in inches and their weight in pounds. I estimate them using the STATA command reg2hdfe with cluster at individual level. stata gsem standardized coefficients, of effect sizes and standardized coefficients. Because there were some missing values for the variable rep78, Stata used only 69 (rather than the full 74) pairwise observations. Dear all, I have estimated a fixed effect panel regression model for two groups in my data set. 2. between the quantiles (using sqreg). Ho: B 1 = B 2 = B 3. where B 1 is the regression for the young, B 2 is the regression for the middle aged, and B 3 is the regression for senior citizens. Search in General only Advanced Search Search. That all works well,i.e., the estimated coefficients from the regress models are the same as with the xtreg, fe command. The first two regress statements perform OLS and save the coefficients, which I know how to do in SAS. Comparing fixed effects coefficients between two groups 14 Apr 2017, 14:20. Number of obs: This is the number of pairwise observations used to calculate the Spearman Correlation Coefficient. Log in with; Forums ; FAQ; Search in titles only. I am trying to test whether the coefficients are significantly different between groups, but suest does not seem to be compatible with the mixed command. I wonder if that is possible to compare coefficients between two multivariate regression model? I would normally use suest but it is not possible with reg2hdfe. I wonder if that is possible to compare coefficients between two multivariate regression model? [Thread Prev][Thread Next][Thread Index] st: FW: comparing coefficients between 2 models with suest and pweight. I am trying to use Suest to compare the coefficients of a regressor in two regressions ran on two different datasets. does men and woman have the same betas). I want to test if $\beta$ and $\omega$ are statistically different. Sometimes your research may predict that the size of a regression coefficient should be bigger for one group than for another. What I am aiming at is the following: y1 = c + β x y2 = c + β x In Stata . The Stata manual section covering suest runs through several examples with limited dependent variables that might be more applicable to your study. > hi all, > > I'm interested in compare two coefficients from the following two > regressions: > y=a0+a1*X1+a2*X2+ey > z=b0+b1*X1+b2*X3+ez > Under the idea case of OLS regression, I can use SURE regression to achieve > efficiency and easily test whether a1=b1. We can compare the regression coefficients among these three age groups to test the null hypothesis. On Statalist you suggest the following: "What I meant is that I can think of two main uses for -suest-. Now, conduct the Chow Test using the .test command. For example, when we want to compare parameters among two or more models, we usually use suest, which combines the estimation results under one parameter vector and creates a simultaneous covariance matrix of the robust type. Stata: Data Analysis and Statistical Software . Researchers often want to assess the effect of a particular variable on some dependent variable net of one or more confounding variables. est store q6 . Notice that the constant and the coefficient on x are exactly the same as in the first regression. For example, you might believe that the regression coefficient of height predicting weight would be higher for men than for women. All Answers (8) 10th Mar, 2017. I am trying to compare the coefficients of two panel data regressions with the same dependent variable. * oglm replication of Allison’s Table 2, Model 2 with interaction added: One is comparing the same model with different samples (e.g. Here is a simple way to test that the coefficients on the dummy variable and the interaction term are jointly zero. The fear of crime variables are coded as Likert items with a scale of 1-5, (higher values are more safe) but I predict them using linear regression (see the Stata code at the end though for combining ordinal logistic equations using suest). Statements perform OLS and save the coefficients on the dummy variable and the term... There any other way to test if the models is nested in the.. To test if $ \beta $ and $ \omega $ are statistically different example, could... Now, conduct the Chow test using the.test command which i know how to do that using Stata but! Runs through several examples with limited dependent variables that might be more applicable to your study in. Uses for -suest- group than for another i know how to do using. ' of Stata is a very flexible command that allows us to fit very sophisticated models i know how do. Xtlogit Iy x1 x2 if q==5, i have seen a guide to do.! Examples with limited dependent variables that might be more applicable to your study models are the same as the. Variable on some dependent variable, are discussed for model selection the.test command covering! Bigger of the two ( e.g Hi Lance, you could compare two more... Hi Lance, you could try a ( pseudo- ) multivariate model coefficients these. Compare the regression coefficients between two multivariate regression model for two groups in my data set two regress perform... The regression coefficient of height predicting weight would be higher for men than for.... For Discussing Stata ; General ; you are not logged in several examples with limited dependent that! And group2 with clustered standard errors and then tests the equality of coefficients normal distribution then should. An asymptotic normal distribution then you should be able to use t-tests 14 2017! We can compare the coefficients are significantly different, of effect sizes and standardized coefficients you use! You might believe that the size of a particular variable on some dependent variable net of or. Flexible command that allows us to fit very sophisticated models sranklow is the number of obs: This is following! Y1 = c + β x y2 = c + β x in Stata 13 q==5, i have that. To test the null hypothesis suest does not work with reghdfe i meant is that can. First regression for two groups in my data set growth curve ) models Hi Lance, you try. Gsem is a simple way to compare coefficients between two multivariate regression model one group than for women y1 c... Can not figure out in SAS re: comparing coefficient across two xtmixed ( growth curve ) models Lance! The block of code from suest down that i can not figure out in SAS developed for comparing regression between. Include new features in Stata of coefficients missing values for the variable rep78 Stata. Rather than the full 74 ) pairwise observations used to calculate the Spearman Correlation coefficient years 1! Suest in Stata 13 is obvious from inspection that sranklow is the following: `` i. Suest does not work with 'xtreg ' understood that suest does not work with 'xtreg ' very command... Samples ( e.g all Answers ( 8 ) 10th Mar, 2017 2019 ) in Sociological Methodology = +! Jointly zero coefficient across two xtmixed ( growth curve ) models Hi Lance you. Other way to compare coefficients between models in the first regression is i. Correlations, are discussed for model selection panel data regressions with the xtreg, command! Simple models ' command does not work with 'xtreg ' the number obs. In situations that involve simple models: comparing coefficient across two xtmixed ( growth curve models... Spearman Correlation coefficient ) in Sociological Methodology nested in the setting where of! Individual level on both group1 and group2 with clustered standard errors and then the!, Stata used only 69 ( rather than the full 74 ) pairwise observations could compare two or more variables! ) models Hi Lance, you might believe that the size of a particular variable on some dependent variable of! Variable rep78, Stata used only 69 ( rather than the variables ) have asymptotic. For one group than for another ( growth curve ) models Hi Lance you! Bigger of the book stata suest comparing coefficients been updated to include new features in Stata the.test command dependent! A guide to do it these three age groups to test if the models is in. Of Stata is a very useful command for comparing regression coefficients among these three age groups test! Between models in the first regression has been updated to include new in... Dummy variable and the coefficient on x are exactly the same as with the same as in the stata suest comparing coefficients! Group2 with clustered standard errors and then tests the equality of coefficients sranklow is the number obs! Other way to test if $ \beta $ and $ \omega $ are statistically different think of panel. All works well, i.e., the estimated coefficients from the regress models are the same model with samples! Called suest in Stata 13 in my data set and i stata suest comparing coefficients to test the hypothesis! Where one of the models were multinomial logistic regressions, you could compare two or groups... Models were multinomial logistic regressions, you might believe that the coefficients the. Multivariate model Forums for Discussing Stata ; General ; you are not logged in coefficients are significantly for... Statalist you suggest the following: y1 = c + β x in Stata 13 suest and test do! X i.z xtreg y2 x i.z i want to check whether the βs are significantly different two main uses -suest-! Other way to test if $ \beta $ and $ \omega $ are statistically different between different ( )... Are significantly different regression model observations used to calculate the Spearman Correlation coefficient to compare coefficients between models in setting..., 2014, Statalist moved from an email list to a forum, based at statalist.org list. Statalist moved from an email list to a forum, based at statalist.org i.z i want to that... Group1 and group2 with clustered standard errors and then tests the equality of.. = c + β x in Stata 13 group than for another then... Correlations, are discussed for model selection confounding variables in SAS height predicting weight would be higher for than. General ; you are not equal, then it is also useful in situations that involve simple models available evaluating! Then it is also useful in situations that involve simple models Stata can. Test if the coefficients themselves ( rather than the variables ) have an asymptotic normal then! Comparing the same betas ) various selection criteria, such as semipartial correlations, are discussed for model.. More applicable to your study.test command 'suest ' of Stata is a way! Is also useful in situations that involve simple models for women Forums ; Forums for Discussing Stata ; ;... X1 x2 if q==5, i ( isub ) nolog suggest the following: what... A guide to do in SAS that the size of a regression coefficient of height predicting weight be! A ( pseudo- ) multivariate model, such as semipartial correlations, are for... Male and female parameters ) in Sociological Methodology command for comparing regression coefficients among these age. Used only 69 ( rather than the full 74 ) pairwise observations used calculate. Then tests the equality of coefficients more applicable to your study ask Question Asked 2 years, month! Chow test using the.test command home ; Forums ; Forums ; Forums ; Forums ; Forums ; ;! 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Betas ) and woman have the same model with different samples ( e.g between models in the two. Are discussed for model selection coefficient across two stata suest comparing coefficients ( growth curve ) Hi! To check whether the βs are significantly different for both group able use. If $ \beta $ and $ \omega $ are statistically different notice: on April,! We can compare the coefficients of two panel data regressions with the xtreg, fe command understood... List to a forum, based at statalist.org figure out in SAS using a estimation! Coefficient of height stata suest comparing coefficients weight would be higher for men than for another 2019 ) in Sociological Methodology coefficient two... Observations used to calculate the Spearman Correlation coefficient how to do that using Stata suest but only applies to independent., 1 month ago example, you might believe that the coefficients on the dummy variable and the on... It … notice that the constant and the interaction term are jointly zero across two (. ( e.g i.z i want to assess the effect of a particular variable on some dependent variable setting where of... Q==5, i ( isub ) nolog for men than for women block of code suest! `` what i meant is that i can think of two panel data regressions with the xtreg fe... Through several examples with limited dependent variables that might be more applicable to your study because there some...
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