my_script.Rmd

---
title: "Example RMarkdown script"
author: "Lukas"
date: "`r Sys.Date()`"
output: html_document
---

Import packages I typically need:

```{r message=FALSE, warning=FALSE}
library(tidyverse)
library(lubridate)
library(zoo)
library(readxl)
library(janitor)
library(scales)
```

Set theme and change some defaults on warnings:

```{r}
theme_set(theme_minimal())
theme_update(axis.text.x=element_text(colour="black"),
             axis.text.y=element_text(colour="black"),
             strip.text = element_text(colour = "black"),
             legend.position = "top") 
options(dplyr.summarise.inform = FALSE) # disable dplyr 1.0 warnings
```

```{r}
mtcars %>% 
  group_by(cyl) %>% 
  summarise(ave = mean(cyl))
```

```{r}
ggplot(mpg, aes(displ, hwy, color = class)) +
  geom_jitter(alpha = 0.7, stroke = 0, size = 3) +
  labs(x = "Fuel efficiency, miles/gallon", y = "Engine size, litres",
       color = "Car class: ", title  = "Car comparison",
       subtitle = "For 38 models, 1999-2008.",
       caption = "Source: US Environmental Protection Agency")
```