---
title: "Session 3 — Variable types"
subtitle: "Probability and Statistics (MIR)"
author: "Prof. Dae-Jin Lee (daelee@faculty.ie.edu)"
date: "Fall 2026"
output:
  html_document:
    toc: true
    theme: flatly
---

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

```{r}
ci <- read_csv("data/country_indicators.csv")
glimpse(ci)
```

# Categorical summaries

```{r}
ci |> count(region, sort = TRUE)

ci |> count(recent_internal_conflict) |>
  mutate(share = n / sum(n))
```

**Interpret:** Proportions describe composition — not causes.