eipi10 - 6 months ago 56

LaTeX Question

In an

`rmarkdown`

I'm using

`texreg`

`texreg`

`xtable`

`pander`

`stargazer`

`rmarkdown`

`latex`

`.tex`

As a bonus, I'd also like to be able to put line breaks in table headings. For example, in

`texreg`

`custom.model.names`

`"Add Horsepower and AM"`

`"Add Horsepower \newline and AM"`

Here's a reproducible example:

`---`

title: "Regression Table"

author: "eipi10"

date: "August 15, 2016"

header-includes:

- \usepackage{dcolumn}

output: pdf_document

---

```{r, echo=FALSE, message=FALSE, results="asis"}

library(texreg)

m1 = glm(mpg ~ wt + factor(cyl), data=mtcars)

m2 = glm(mpg ~ wt + factor(cyl) + hp + factor(am), data=mtcars)

texreg(list(m1,m2),

single.row=TRUE,

custom.model.names=c("Base Model", "Add Horsepower and AM"),

custom.coef.names=c("Intercept", "Weight","Cyl: 6", "Cyl: 8", "Horsepower","AM: 1"))

```

And here's what the output table looks like:

Answer

This took quite a bit of wrangling, but I think it gets you close to what you want. I used `xtable`

. The main idea is to create two columns for each model, one aligned right (coefficients) and the other aligned left (standard errors). So for a table with two models, we have five columns. Headers and the summary statistics are displayed in cells that span two columns.

First, we have `header.tex`

, drawing on p. 27 of the `xtable`

vignette:

```
\usepackage{array}
\usepackage{tabularx}
\newcolumntype{L}[1]{>{\raggedright\let\newline\\
\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{C}[1]{>{\centering\let\newline\\
\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\let\newline\\
\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{P}[1]{>{\raggedright\tabularxbackslash}p{#1}}
```

The `.Rmd`

file. I learnt about `add.to.row`

from this answer.

```
---
title: "Regression Table"
author: "eipi10"
date: "August 15, 2016"
header-includes:
- \usepackage{dcolumn}
output:
pdf_document:
includes:
in_header: header.tex
---
```{r, echo=FALSE, message=FALSE, results="asis"}
library(xtable)
library(broom)
m1 = glm(mpg ~ wt + factor(cyl), data=mtcars)
m2 = glm(mpg ~ wt + factor(cyl) + hp + factor(am), data=mtcars)
p_val <- c(0, 0.001, 0.01, 0.05, 1)
stars <- sapply(3:0, function(x) paste0(rep("*", x), collapse=""))
make_tbl <- function(model) {
coefs <- summary(model)$coefficients
coef_col <- round(coefs[,1], 2)
se_col <- round(coefs[,2], 2)
star_col <- stars[findInterval(coefs[,4], p_val)]
tbl <- data.frame(coef=coef_col)
tbl$se <- sprintf("(%0.2f)%s", se_col, star_col)
tbl
}
make_addtorow <- function(row.name, terms) {
# xtable allows the addition of custom rows. This function
# makes a row with a one column (which is used for the row
# names for the model statistics),
# followed by two columns that each span two columns.
paste0(row.name,
paste0('& \\multicolumn{2}{C{3cm}}{',
terms,
'}',
collapse=''),
'\\\\')
}
tbl1 <- make_tbl(m1)
tbl2 <- make_tbl(m2)
combo <- merge(tbl1, tbl2, by = "row.names", all = TRUE)[,-1]
rownames(combo) <- c("Intercept", "AM: 1", "Cyl: 6", "Cyl: 8", "Horsepower", "Weight")
sum_stats <- round(rbind(glance(m1), glance(m2)), 2)
addtorow <- list()
addtorow$pos <- list(0, 6, 6, 6, 6, 6)
addtorow$command <- c(
make_addtorow("", c("Base model", "Add Horsepower and AM")),
make_addtorow("\\hline AIC", sum_stats$AIC), # Draw a line after coefficients
make_addtorow("BIC", sum_stats$BIC),
make_addtorow("Log Likelihood", sum_stats$logLik),
make_addtorow("Deviance", sum_stats$deviance),
make_addtorow("Num. obs.", sum_stats$df.null + 1)
)
xtbl <- xtable(combo, add.to.row = addtorow, include.colnames = FALSE,
comment = FALSE)
# Specify column alignment for tabularx environment
# We're using the custom column types we created in header.tex
# \hskip specifies the width between columns
align(xtbl) <- c("L{2.5cm}", "R{1.5cm}@{\\hskip 0.1cm}", "L{1.5cm}",
"R{1.5cm}@{\\hskip 0.1cm}","L{1.5cm}")
print(xtbl,
tabular.environment = "tabularx", # tabularx takes two arguments
width = ".60\\textwidth", # width, and alignment (specified above)
add.to.row = addtorow,
include.colnames = FALSE,
comment = FALSE)
```
```