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Converting a model into latex equation
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| equation_lm <- function(model) { | |
| rhs <- colnames(model.matrix(model))[-1] | |
| lhs <- all.vars(formula(model))[1] | |
| lhs_eq <- paste(lhs, "= ") | |
| betas <- paste0("\\beta_{", seq_along(rhs), "}(") | |
| rhs_eq <- paste0(betas, rhs, ")") | |
| rhs_eq <- paste("\\alpha +", paste(rhs_eq, collapse = " + ")) | |
| error <- "+ \\epsilon" | |
| cat( | |
| paste("$$\n", | |
| paste0(lhs_eq, rhs_eq), | |
| error, | |
| "\n$$") | |
| ) | |
| } | |
| # fit a couple simple models | |
| mod1 <- lm(mpg ~ cyl + disp, mtcars) | |
| mod2 <- lm(mpg ~ ., mtcars) | |
| # test it out | |
| equation_lm(mod1) | |
| ## $$ | |
| ## mpg = \alpha + \beta_{1}(cyl) + \beta_{2}(disp) + \epsilon | |
| ## $$ | |
| equation_lm(mod2) | |
| ## $$ | |
| ## mpg = \alpha + \beta_{1}(cyl) + \beta_{2}(disp) + \beta_{3}(hp) + \beta_{4}(drat) + \beta_{5}(wt) + \beta_{6}(qsec) + \beta_{7}(vs) + \beta_{8}(am) + \beta_{9}(gear) + \beta_{10}(carb) + \epsilon | |
| ## $$ | |
| # Test with a categorical predictor | |
| mod3 <- lm(Sepal.Length ~ Sepal.Width + Species, iris) | |
| equation_lm(mod3) | |
| ## $$ | |
| ## Sepal.Length = \alpha + \beta_{1}(Sepal.Width) + \beta_{2}(Speciesversicolor) + \beta_{3}(Speciesvirginica) + \epsilon | |
| ## $$ |
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