---
title: "Lab 6: Import, Parse, and Explore"
---

```{r}
#| label: setup
#| include: false
knitr::opts_chunk$set(
  echo = TRUE,
  message = FALSE,
  warning = FALSE,
  fig.width = 6,
  fig.height = 3.6,
  fig.align = "center",
  dpi = 120,
  error = TRUE,
  fig.path = "_figs/lab-6-readr-eda/"
)
library(tidyverse)
```

Load the hate-crime files, parse a few strings, and explore diamonds.

Work in a **Quarto** document. Do **6.1** through **6.3** first. Put the course CSV files in a `data/` folder of your project (see the Data section of the course page).

```{r}
#| label: chunk-1
library(tidyverse)
```

---

## 1. Import

1. `read_lines()` on `hate_crimes1.csv` through `hate_crimes7.csv` and `hate_crimes_1a.csv`. Then load each with the matching `read_*()`. Check `head()` and the number of `NA`s per column.
2. Load `hate_crimes_1a.csv` once as-is and once with `na = "missing"`. What changed?

---

## 2. Parsers

1. Parse `"01, January 2018"`, `"01-January/2000"`, and `"1 Jan 19"` as dates.
2. Parse `"10:40 pm"` and `"23:40-22"` as times.
3. Load `estate.csv`. Use `problems()` if anything looks off. Set `col_types` for at least one column.

---

## 3. EDA

Using `diamonds` (or `estate` if you prefer):

1. The distribution of one categorical variable and one quantitative variable.
2. A scatterplot of two quantitative variables, with overplotting handled.
3. A boxplot of a quantitative variable by a categorical variable.