How to remove intercept in R

r intercept
Kazo picture Kazo · Jan 8, 2013 · Viewed 72.6k times · Source

I need to create a probit model without the intercept. So, how can I remove the intercept from a probit model in R?

Answer

Gavin Simpson picture Gavin Simpson · Jan 8, 2013

You don't say how you are intending to fit the probit model, but if it uses R's formula notation to describe the model then you can supply either + 0 or - 1 as part of the formula to suppress the intercept:

mod <- foo(y ~ 0 + x1 + x2, data = bar)

or

mod <- foo(y ~ x1 + x2 - 1, data = bar)

(both using pseudo R code of course - substitute your modelling function and data/variables.)

If this is a model fitting by glm() then something like:

mod <- glm(y ~ x1 + x2 - 1, data = bar, family = binomial(link = "probit"))

should do it (again substituting in your data and variable names as appropriate.)

Related questions

Plot and report X intercept from linear regression - R

I am using lm in r for linear regression. I would like to plot and report the x intercept. I know that I could use algebra and solve for x by setting y = 0, but is there a way to have …

Read More
Remove rows with all or some NAs (missing values) in data.frame

I'd like to remove the lines in this data frame that: a) contain NAs across all columns. Below is my example data frame. gene hsap mmul mmus rnor cfam 1 ENSG00000208234 0 NA NA NA NA 2 ENSG00000199674 0 2 2 2 2 3 ENSG00000221622 0 NA NA NA NA 4 …

Read More
Drop data frame columns by name

I have a number of columns that I would like to remove from a data frame. I know that we can delete them individually using something like: df$x <- NULL But I was hoping to do this with …

Read More