---
title: "Lecture 8"
author: "Matt Blackwell"
date: "2023-09-28"
output: html_document
---

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


```{r}
library(tidyverse)
library(gov50data)
newspapers
```




```{r}
switched <- newspapers |>
  filter(to_labour == 1) |>
  summarize(mean(vote_lab_97))

no_switch <- newspapers |>
  filter(to_labour == 0) |>
  summarize(mean(vote_lab_97))


switched - no_switch
```



## Statistical control

```{r}
newspapers |> 
  group_by(to_labour, parent_labour) |>
  summarize(lab_vote = mean(vote_lab_97)) |>
  pivot_wider(
    names_from = to_labour,
    values_from = lab_vote
  ) |> 
  mutate(ATE = `1` - `0`)
```


## Before and after


```{r}
newspapers |>
  filter(to_labour == 1) |>
  mutate(
    vote_change = vote_lab_97 - vote_lab_92
  ) |>
  summarize(avg_change = mean(vote_change))
```

## DiD

```{r}
newspapers |>
  mutate(
    vote_change = vote_lab_97 - vote_lab_92
  ) |>
  group_by(to_labour) |>
  summarize(avg_change = mean(vote_change)) |>
  pivot_wider(
    names_from = to_labour,
    values_from = avg_change
  ) |>
  mutate(did = `1` - `0`)
```