# Questions tagged [regression-coefficients]

The parameters of a regression model. Most commonly, the values by which the independent variables will be multiplied to get the predicted value of the dependent variable.

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### Promotion analysis with regression, negative coefficients

I used multiple linear regression to model promotion effects on sales on sample retail store, but some coefficients becomes negative. As a business interpretation, should I consider these promotions ...
865 views

### Interpretation regression coefficients predictors and dummy variables

I have to run a regression predicting the DV (continuous) from an equation with: Y = X1(dichotomous factor, coded 0-1)+X2(dichotomous factor, coded 0-1)+X1X2+M1+M2+M3+...+Mn, where M1...Mn - ...
378 views

### Calculate coefficients in a ordinal logistic regression with R

Following the question about manually fitting logistic regression, can someone provide the same 'manual' way to fit a ordinal logistic regression with ordered categorical response?
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### Comparing coefficients of two variables: one is significant, the other is not significant

I'm trying to test whether the coefficient for one independent variable ($X_1$) is larger than coefficient for another variable ($X_2$) in predicting the dependent variable ($Y$). For example, my ...
307 views

### Coefficient of Determination: For the perimeter and area of a square: Why different?

When calculating the coefficient of determination for a square, why is it that if you use the data set for the side length of as X= (1,2,3,4) and the perimeter as Y=(4,8,12,16) the Coefficient of ...
156 views

### Interaction variable in multiple regressions

I am running regressions of the sort: $$y_{i}= \alpha + \beta T_{i} + \gamma G_{i} + \delta( T_{i} * G_{i}) + \rho X_{i} + \epsilon_{i}$$ where $T_{i}$ is binary treatment variable, $G_{i}$ is ...
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### Coefficient marginal to interactions in linear regression

Consider this model: $$y = \beta_0 +\beta_1x_1 + \beta_2x_2 + \beta_3x_1x_2 + \varepsilon$$ Somebody told me today that the coefficient for the main effect of $x_1$ (i.e., $\beta_1$) will be '...
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### Should I report the standardised or unstandardised coefficient in a regression?

When I run a multiple OLS regression, SPSS will give me a thing called a 'standardized coefficient' and another called an 'unstandardized coefficient'. I understand that, essentially, the ...
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### SEM: Is there a way to constrain the standardized path coefficients to be equal in Mplus?

I read that in order to test whether 2 paths in a structural equation model significantly differ from each other, you have to compare one model in which both paths are allowed to differ with a second ...
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### Analysing transformed data

Is it possible to carry out normal multiple linear regression when the dependent variable and one predictor variable have been transformed using square root transformation? (as they did not follow ...
280 views