---
title: "Session 1 — Software setup"
subtitle: "Probability and Statistics (MIR)"
author: "Prof. Dae-Jin Lee (daelee@faculty.ie.edu)"
date: "Fall 2026"
output:
  html_document:
    toc: true
    toc_float: true
    theme: flatly
---

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, message = TRUE, warning = FALSE)
```

# Confirm R works

```{r}
R.version.string
```

# Packages to knit these `.Rmd` files (run once)

You need **knitr** and **rmarkdown** to compile (Knit) any course `.Rmd` to HTML.  
Also install course analysis packages (`tidyverse`, `qss`, …).

In RStudio: open this file → click **Knit**, *or* run the chunk below first.

```{r install-rmd, eval=FALSE}
# Required to compile / Knit R Markdown files
install.packages(c("rmarkdown", "knitr"))

# Course data-analysis packages
install.packages(c("tidyverse", "devtools", "haven"))

# QSS datasets and vignettes (GitHub)
# if you have not installed the `devtools` package
# install.packages("devtools")
library("devtools")
install_github("kosukeimai/qss-package", build_vignettes = TRUE)
```

After installing, restart R (Session → Restart R) if prompted, then continue.

# Load packages (every session)

```{r}
library(tidyverse)
library(qss)
```

# Confirm QSS data are available

```{r}
data(package = "qss")          # list all datasets
data("UNpop", package = "qss") # Ch. 1 running example
head(UNpop)
glimpse(as_tibble(UNpop))
```

**Interpret:** What is the unit of analysis? Which columns are variables?

# How to Knit an `.Rmd`

1. Open the `.Rmd` in RStudio.  
2. Click the **Knit** button (or `Cmd/Ctrl + Shift + K`).  
3. An HTML file appears in the same folder.

If Knit fails with “there is no package called ‘rmarkdown’”, re-run the install chunk above.

Next: open `01-arithmetic.Rmd` (or see `README.Rmd` for the full order).