# Questions tagged [sur]

SUR stands for "Seemingly Unrelated Regressions", an econometric technique for fitting several models (w/ different variables) simultaneously. SUR may be more efficient than fitting the models separately.

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### SEM One regressor depends on another regressor

I have the following structural model, by which one of the regressors is partially explained by another. $$y_1= x_1+x_2+x_3+e \tag{1}$$ $$x_1= x_2 + u \tag{2}$$ The questions are: a) Can ...
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### SUR with unbalanced panel and cross equation restrictions - available software?

I would like to estimate a SUR model with an unbalanced panel and with cross equation restrictions. This does not seem possible with the standard SUR commands in Stata or R. Do you have an idea which ...
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### What is the difference between SUR and OLS?

How is the output different in the SUR (Seemingly Unrelated Regressions) equation from the OLS? Is it still the same as Bo + B1x = y?
236 views

### What is the difference between seemingly unrelated regression (SUR) and correcting a set of OLS results for multiple comparisons?

As I understand it, the the seemingly unrelated regressions (SUR) or seemingly unrelated regression equations (SURE) models estimate a set of Ordinary Least Squares (OLS) equations where the error ...
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### How to compare coefficients of multivariate multiple regression models, possibly using SUR

I am trying to compare the model parameters among three multivariate multiple regressions. All three models incorporate date from the same 97 individuals and share the same 4 independent variables (...
193 views

### Solving SUR with (N-1) Equations

Problem I'm estimating a seemingly unrelated regression (SUR) with identical regressors where my dependent variable, $y_{cit}$, is a share of total across $c$, such that, $\sum_{c=1}^5 y_{cit}$ = 1. ...
333 views

### Why are individual fixed effects from a “within” and from a dummy variable panel model different?

I am working on a long panel data set with N=34 and T=132. I need to extract fixed effects from plm (within) model and estimation of the same model but including dummies for individuals (N-1) in OLS. ...
854 views

### How to perform a SUR with Panel Data?

To do a sureg in Stata I was thinking of reg healthy x1 x2 ... i.year i.country ...
898 views

### Seemingly Unrelated Regression with the same dependent variables

I am analyzing the effect of foreign aid on governance. Foreign aid consists of six categories and I want to know each effect. Governance is measured by one indicator. I made six regression equations ...
127 views

### Are multivariate probit models with the same set of explanatory variables for each outcome more efficient that piecewise probit regressions?

I understand that multivariate probit models are analogous to SUR models. In the SUR case, there's no efficiency gain by fitting a SUR model over several independent OLS regressions when the model ...
26 views

### testing hypothesis in spatial sure models

I have estimated spatial sur models (lag and error) using the spse program, spseml function. I want to test some restrictions about the coefficients in this model and I have not been able to do it ...
268 views

### Multiple impute multilevel data and postestimation tests

I want to do the following three things but am not sure how/whether they can be done: multiple impute multilevel data. I would be ok with just accounting for clusters, but I need to somehow account ...
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### seemingly unrelated regression with random effects?

There are a lot of examples on the internet about Seemingly Unrelated Regression (SUR) and Random Effects (RE). However, I could not find an example that combines both these methods. My question is: I ...
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### T-test across two regressions (seemingly unrelated)

I want to compare across two regressions if the coefficients are equivalent using a t-test, how could I approach this and is there a function in R, which does this for seemingly unrelated regressions? ...
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### Questions about Seemingly Unrelated Regression when all covariates are the same, but Y is different

Assuming I was estimating the same regression model, but had two dependent variables. Say one is income for women, and one is income for men. I want to understand if I understand the reason for using ...
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### VAR($p$) estimation

I am bit stumped by this result. Source: Remark on page 46 of Multivariate Time Series Analysis by Rsay. ... one can obtain the GLS estimate of a VAR($p$) model equation by equation. That is, one can ...
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### Wald test / seemingly unrelated regression on models with clustered standard errors in R

I am trying to conduct a Wald test (aka seemingly unrelated regression) on multivariate models with clustered standard errors in R. This is easy to do in Stata, but I cannot figure out how to do it in ...
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### Estimating VAR using OLS vs. SUR in R

According to Enders (2014), p. 303 as long as there are identical regressors in each equation in the VAR, OLS estimates are consistent and asymptotically efficient. However, I imposed restrictions in ...
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### How to simulate coefficients from a multivariate distribution and the variance matrix from a inverse Wishart distribution?

I have estimated a Seemingly Unrelated Regression (SUR) and I would like to simulate the coefficients using the posterior distribution. When researching how to do that, I have read that you should not ...
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### SUR with cross-equation restrictions derivation of the equation?

How to derive this equation? It is not homework, but I want to understand the process behind it and how the restricted estimator follows from that equation in the third bullet.
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### Why use iterated SUR (ISUR) over regular (one-step) SUR?

Stata, a statistical package, offers the possibility to estimate a system of equations using Zellnerās seemingly unrelated regression (SUR) in either one-step or using an iterated SUR (ISUR) method ...
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### Model selection criteria for Seemingly Unrelated Regressions - same as OLS?

If there are two SUR models, each containing two equations, and the only differences between them is the exclusion of a dummy variable in the second set (or say, the intercept term) what measures ...
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### Is there any benefit of using GLS when the regressors are identical

I am reading Greene, Econometric Analysis, 7th Addition, I am seeking a point of clarrification. "The case of identical regressors is quite common [think a VAR mode].... In this special case, ...
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### Comparing OLS regression coefficients with SUR in SAS

I have the following code in Stata that I'm looking for the equivalent in SAS. Stata code: ...
112 views

### Simultaneous estimation of a group of linear model (regression) parameters

Suppose $y=ax+z$ where $x, y, z$ are random variables with range in $\mathbf R$, $\mathbf E[x]=\mathbf E[z|x]=0$ and $a$ is a constant. Note the distribution of $z$ conditioned on $x$ depends on $x$. ...
We know that the CAPM regression (for a asset i) is given by $\ z_i = Ī±_i1_T +$ $\beta_iz_m + Īµ_i = XāĪø_i + Īµ_i$ How can I show that the estimator of $\hat\alpha$ has the following distribution \$\...