# compare beta from different regressions

Compare beta coefficients of different panel regressions 07 Dec 2018, 03:27 Dear Statalist-Users, Thank you for taking me in. Descriptivley the R square value of the one group (boys) is higher So my actual question is: are the betas from the separate A and B regressions still ârightâ and the p-value for beta_input*condition in the full regression with interaction term still decides for this two betas whether they are statistically different or is the p-value for The difference between T-test and Linear Regression is, Linear Regression is applied to elucidate the correlation between one or two variables in a straight line. Hi, I have a same issue but in a different context. It follows that one cannot compare Beta weights between models if the runs are conducted on samples with different variable standard deviations. Now, i would like to compare the two R square values to see which model explains more variance. I have two samples of survey data and I am running similar SEM models on each sample. If the models were multinomial logistic regressions, you could compare two or more groups using a post estimation command called suest in stata. Is there any method/creteria to standardize regression coefficients coming from different regressions. Compare this output to the results in the text. > > Why not instead just compare the size of the unstandardized coefficients? The interpretation differs as well. After many hours of research, also in this forum, I decided to open my own thread. I know the ttest function in stata but it does not work in case the coefficients are coming from different regressions (as far as I know). How do you test the equality of regression coefficients that are generated from two different regressions, estimated on two different samples? I calculated two linear regressions over the same variables but for two groups (boys and girls). Exit SPSS. A beta may produce different results because of the variations in estimating it, such as different time spans used to calculate data. I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is: how to compare two coefficients from a multiple linear regression to see if the effect strengths are significantly different. Proportion data that is inherently proportional Other proportion data is inherently proportional, in that itâs not possible to count âsuccessesâ or âfailuresâ, but instead is derived, for example, by dividing one continuous variable by a given denominator value. I am trying to test whether the two beta coefficients CSV from two different regressions are significantly different from each other with a t-test. If you are going to compare correlation coefficients, you should also compare slopes. Notice the values are the same, but the styles are different since the output in the book (earlier edition) is from Minitab, a different data analysis program. The use of these standardised values allows you to directly compare the effects on the dependent variable of variables measured on different scales. Hi everyone I would like to test if two coefficients are significantly different from each other. If the slopes really were identical, what is the chance that randomly selected data points would have slopes as different (or more different) than you observed. The sample sizes are however different! Multiple Regression: An Overview Regression analysis is a common statistical method used in finance and investing.Linear regression is one of â¦ Is there any method/creteria to standardize regression coefficients coming from different regressions. There, the denominator is not the total variation in Y, but the unexplained variation in Y plus the variation explained just by that X. I'm not sure whether the command of -lincom- is For example this is what I have so far: newey ret_av12 CSV, lag(1) est store n1 newey ret_av12 CSV IP1 int1, lag(1) est store n2 Beta in a linear regression is a standardised coefficient indicating the magnitude of the correlation between a certain independent variable and the dependent variable. If the P value is less than 0.05 If the P value is low, Prism concludes that the lines are significantly different. Imagine there is an established relationship between X and Y. We can compare the regression coefficients among these three age groups to test the null hypothesis 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. We will not need control charts, time-series sequence plots, or runs counts. OR We want to compare regression beta's coming from two different regressions. There are several different kinds of multiple regressionsâsimultaneous, stepwise, and hierarchical multiple regression. Repeatedly draw samples with replacement, run your two models, and compare intercepts each time. This approach uses a single model, applied to the full sampleâ¦ Criterionâ = b1predictor + b2group + b3 In this study, I try to test the capital asset pricing model (CAPM), three-factor Fama-French (3F-FF) model and five-factor Fama-French (5F-FF) model for the Turkish stock market. If you perform linear regression analysis, you might need to compare different regression lines to see if their constants and slope coefficients are different. Partial Eta Squared solves this problem, but has a less intuitive interpretation. It is quite possible for the slope for predicting Y from X to be different in one population than in another while the correlation between X and Y is identical in the two populations So shouldn't beta give the same? Itâs up to you to decide if you want to save e.g. This makes it hard to compare the effect of a single variable in different studies. The shortcut: Skip all the stuff below and just bootstrap it. Linear Regression vs. Ultimately the main effects are indeed different variables, but both are measured with 5 items on a 7-point Likert scale, and the variances of both are nearly exactly the same (.02 difference). Therefore, when you compare the output from the different packages, the results seem to be different. *For assistance with conducting regressions or other. You must set up your data and regression model so that one model is nested in a more general model. The different between the methods is how you enter the independent variables into the equation. What I am aiming at is the following: y1 = c + Î² x y2 = c + Î² x In Stata xtreg y1 x i.z xtreg y2 x i.z I want to check whether the Î²s are significantly different. regressions will be simpler: we do not need to check as to whether the data are in statistical control through time. Dear all, With a logistic regression, now I try to compare the coefficients of two different predictors on the same dependent variable, in order to see which one is more important/salient for the prediction of DV. We have performed two linear regressions (OLS), one with data from 2009 and one with data from 2014. Using the example and beta coefficient above, the equation can be written as follows: y= 0.80x + c, where y is the outcome variable, x is the predictor variable, 0.80 is the beta coefficient, and c is a constant. The only difference between the two models is that they have different dependent variables: the first model is predicting DV1, while the second model is predicting DV2. Regardless, do you have a formula to The problem is that the change from b1 to b2 is a function of the difference between beta.hat1 and beta.hat2 and the difference between sigma1 and sigma2 and both change (except under the sharp null that x2 is irrelevant; if that was true, the question would not have been asked. Microsoft Excel serves as â¦ OR We want to compare regression beta's coming from two different regressions. You can simply skip that part of the analysis, even though by now it1 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. First off note that instead of just 1 independent variable we can include as many independent variables as we like. In simultaneous (aka, standard) multiple All the variables are the same, both the dependent and the six independent variables. All observations are from the same sample, so the regression coefficients are dependent. b1 = beta.hat1 / sigma1 while b2 = beta.hat2 / sigma2. This kind of data can be analyzed with beta regression or can be analyzed with logistic regression. To make the SPSS results match those from other packages (or the results from the analysis above), you need to create a new variable that has the opposite coding (i.e., switching the zeros and ones). I want to compare the beta coefficients achieved from each model. This standardization means that they are âon the same scaleâ, or have the same units, which allows you to compare Beta coefficients are regression coefficients (analogous to the slope in a simple regression/correlation) that are standardized against one another. Multiple linear regression is a bit different than simple linear regression. I am trying to compare the coefficients of two panel data regressions with the same dependent variable. The sample is from June 2000 to May 2017. 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