为什么 LaTeX 无法在 RMarkdown 中编译

Question

我的代码应该很容易编织成 pdf，但它无法编译，我在 R Markdown 中收到此消息：

！ LaTeX 错误：Unicode 字符 ₁ (U+2081) 未设置为与 LaTeX 一起使用。

错误：LaTeX 无法编译 L-work-5.tex。有关调试提示，请参阅 https://yihui.org/tinytex/r/#debugging。有关详细信息，请参阅 L-work-5.log。执行暂停

代码如下：


---
title: "work 5"
author: "PLars"
date: "4/2/2022"
output: pdf_document

fonttheme: professionalfonts
fontsize: 12pt
editor_options:
  markdown:
    wrap: 72
---

```{r, echo = FALSE, results = "hide", message = FALSE, purl = FALSE}
library(knitr)


opts_chunk$set(tidy = FALSE,
               fig.align = "left",
               background = '#a6a6a6',
               fig.width = 10,
               fig.height = 10,
               out.width ="\linewidth",
               out.height = "\linewidth",
               message = FALSE,
               warning = FALSE,
               fig.align = "left"
               )

options(width = 55, digits = 3)
library(scales)
percent <- function(x, digits = 2, format = "f", ...) {
  paste0(formatC(100 * x, format = format, digits = digits, ...), "%")
}
library(haven)
library(tinytex)
library(stargazer)
library(tidyverse)
library(texreg)
library(dplyr)
library(texreg)
library(AER)
library(tidyverse)
```

**Part I - Categorical Models (5 points)**

Say that you estimate an ordered logit model with a three category
dependent variable and two independent variables, X~₁i~ and X~₂i~, and
obtain the following results:

```{=tex}
\begin{center}
\begin{tabular}{c|rc}
\hline \hline
& $\hat{\beta}$ & SE \
\hline
$X_{1}$ & $-0.68$  & $(0.23)$    \
$X_{2}$ &  $-0.47$  & $(0.13)$  \
\hline
$\tau_1$    & $-1.02$ & $(0.46)$ \
$\tau_2$    & $.85$  & $(0.21)$ \
\hline
\end{tabular}
\end{center}
```
```{=tex}
\begin{enumerate}

\item  Calculate $\Pr(Y_i=1 | X_{1i}=1, X_{2i}=0)$.

\item  Calculate $\Pr(Y_i=2 | X_{1i}=1, X_{2i}=0)$.

\item  Calculate $\Pr(Y_i=3 | X_{1i}=1, X_{2i}=0)$.

\item Calculate the first difference (difference in probability in category) that result from changing X_{2i} from -2 to 2, holding X_{1i} fixed at 0. Do calculations for each possible value of Y_i.

\item Explain how we might assess whether the parallel regression assumption holds for this model? If it does not, what alternative might you pursue if this were your model?

\end{enumerate}
```
# 

First, we calculate $X_i \beta$

```{r}
(xiB <- (-.068*1) + (-0.47*0)) 
```

Then, plug into the following equations:

```{r}
(prob1 <- 1/(1 + exp(-(-1.02-xiB))))

(prob2 <- 1/(1 + exp(-(.85-xiB))) - prob1)

(prob3 <- 1 - (1/(1 + exp(-(.85-xiB)))))

prob1 + prob2 + prob3
```

Answer 1

首先，尝试删除行

中的特殊字符 ₁ 和 ₂

two independent variables, X~₁i~ and X~₂i~

这会让你编译。

您可能可以通过包含类似

的东西来实现它

\newunicodechar{₁}{\ensuremath{{}_1}}

下标 2 字符也类似，位于文件的顶部（来自 this TeX Stack Exchange question），但我尚未对其进行测试，现在不想掉进那个兔子洞。 ..

或者将相关文字改为

two independent variables, $X_{1i}$ and $X_{2i}$

这可能会按原意排版！

为什么 LaTeX 无法在 RMarkdown 中编译

Why is LaTeX failing to compile in RMarkdown

latex

r

r-markdown