## How do you add a line to a boxplot?

- Add a Reference Line to a Box Plot. Horizontal reference lines can be added to a Box Plot using the abline function.
- Customize Reference Lines. The default reference line is a simple black line.
- Line Color. The line color can be customized using the col argument.
- Line Type.
- Draw Line behind Bars.

## How do I add a vertical line in ggplot2?

Example: To add the vertical line on the plot, we simply add geom_vline() function to ggplot2() function and pass the xintercept, which basically has a location on X-axis, where we actually want to create a vertical line.

**What are the lines on a boxplot called?**

The body of the boxplot consists of a “box” (hence, the name), which goes from the first quartile (Q1) to the third quartile (Q3). Within the box, a vertical line is drawn at the Q2, the median of the data set. Two horizontal lines, called whiskers, extend from the front and back of the box.

**How do you manipulate a boxplot in R?**

Before you start to create your first boxplot() in R, you need to manipulate the data as follow:

- Step 1: Import the data.
- Step 2: Drop unnecessary variables.
- Step 3: Convert Month in factor level.
- Step 4: Create a new categorical variable dividing the month with three level: begin, middle and end.

### What is Abline R?

abline() function in R Language is used to add one or more straight lines to a graph. The abline() function can be used to add vertical, horizontal or regression lines to plot.

### How do I add a vertical and horizontal line in R?

abline() function in R Language is used to add one or more straight lines to a graph. The abline() function can be used to add vertical, horizontal or regression lines to plot. Syntax: abline(a=NULL, b=NULL, h=NULL, v=NULL, …)

**What is the middle line in a Boxplot?**

The median (middle quartile) marks the mid-point of the data and is shown by the line that divides the box into two parts. Half the scores are greater than or equal to this value and half are less.

**What is notch in Boxplot?**

The notches on the sides of a box plot can be interpreted as a comparison interval around the median values. The height of the notch is the median +/- 1.57 x IQR/sqrt(n) where IQR is the interquartile range defined by the 25th and 75th percentiles and n is the number of data points [1].

## What is a geom in the ggplot2 system?

A ggplot2 geom tells the plot how you want to display your data in R. A geom defines the layout of a ggplot2 layer. For example, you can use geoms to create bar charts, scatterplots, and line diagrams (as well as a variety of other plots), as you can see below.

## What is GeomLine R?

geom_line() connects them in order of the variable on the x axis. geom_step() creates a stairstep plot, highlighting exactly when changes occur. The group aesthetic determines which cases are connected together. aes = TRUE ) geom_line( mapping = NULL, data = NULL, stat = “identity”, position = “identity”, na.

**How to fill ggplot boxplot with color in R?**

1) Default: For filling the boxplot with your choice of color then you can use the fill attribute command to add colors inside the geom_boxplot () function. The fill will be under geom_boxplot ( ) as it is variable in this case. For filling the boxplot color by default you just need to include fill attribute in aes () function within ggplot ().

**How to plot box and whisker plot using Ggplot2?**

With the forecast I can plot the box and whisker plot using ggplot2 like below. $p<- ggplot (data = forecasts, aes (x=as.factor (Date), y=value)) p<- p + geom_boxplot (aes (fill=f_type))

### How to add a mean value to a boxplot in R?

Then simply put all the attributes to plot by in ggplot () function along with geom_boxplot. Mean value can also be added to a boxplot, for that we have to specify the function we are using, within stat_summary (). This function is used to add new summary values and add these summary values to the plot.

### What is a box plot in statistics?

Well, a Box plot is a graph that illustrates the distribution of values in data. Box plots are commonly used to show the distribution of data in a standard way by presenting five summary values. The list below summarizes the minimum, Q1 (First Quartile), median, Q3 (Third Quartile), and maximum values.