50k views

When forcing intercept of 0 in linear regression is acceptable/advisable [duplicate]

I have a regression model to estimate the completion time of a process, based on various factors. I have 200 trials of these processes, where the 9 factors being measured vary widely. When I perform a ...
6k views

Deliberately fitting a model without intercept [duplicate]

Is there a situation in which the mean of a Y variable is not 0 (e.g. not standardized), but we would still fit a regression model without intercept? It would yield a worse fitting model, so is there ...
32k views

Significance of Regression Intercept (R lm model) [duplicate]

Question: Having performanced a linear regression in R with the lm function, I'm not sure how to interpret the results for the Intercept (as shown below). It seems the probability of the intercept'...
3k views

What are the uses and pitfalls of regression through the origin? [duplicate]

Spuriously high R-squared is one of the pitfalls of regression through the origin (i.e. zero-intercept models). If the predictors do not contain zeroes, then is it an extrapolation? What are the uses ...
2k views

Ridge Regression: When should the intercept be included ? What is the purpose of the intercept term? [duplicate]

I am trying to determine what is the purpose of including the intercept term in ridge regression. In what situations should I include the intercept term ? And in what situations should I not ...
4k views

To exclude or include the intercept in GLM model [duplicate]

When is is appropropriate to include or exclude the intercept from a regression model? SPSS provides this option in the GLM menu. I am assessing group difference (gender) on tasks performed (X) and ...
2k views

Constant in OLS model [duplicate]

Sometimes in OLS model we have constant for example -2345 significant and doesn't have a mean. Why we must keep it in the model? Why when we drop it the results change? What does it mean? And ...
870 views

Explain the fit_intercept parameter in some scikit learn classifiers [duplicate]

I'm fairly new to machine learning and I am using the Linear SVM classifier to classify some text data and I was wondering what exactly does the fit_intercept parameter does and what would be a good ...
367 views

Regression: Insignificant Intercept [duplicate]

I ran a regression and the intercept is statistically insignificant (the p-value is greater than 0.05). I tried to look in some textbooks as to how to handle this scenario but I am still unsure. One ...
562 views

OLS with categorical variables [duplicate]

1) When we omit the intercept, aren't we forcing the regression line through the origin? Does that pose any problem because we assume that there is no variable that affects the outcome other than the ...
524 views

Logical reasons for choosing regression through the origin [duplicate]

Is it reasonable to choose a regression model with a value of 0 for the intercept when this makes logical sense? For example, I am trying to model a physical ...
292 views

Can I leave intercept out in OLS? [duplicate]

I have a model similar to the following: y = a + b + c + d + e; a,b, and ...
255 views

Regression Through Origin [duplicate]

I was reading about (simple) linear regression through origin and I have the following questions: What are the standard assumptions of such a regression model? I am asking this of the true model not ...