# Draw a Quantile-Quantile Plot in R Programming – qqline() Function

• Last Updated : 16 Dec, 2021

The Quantile-Quantile Plot in Programming Language, or (Q-Q Plot) is defined as a value of two variables that are plotted corresponding to each other and check whether the distributions of two variables are similar or not with respect to the locations. qqline() function in R Language is used to draw a Q-Q Line Plot.

## R – Quantile-Quantile Plot

Syntax: qqline(x, y, col)

Parameters:

• x, y: X and Y coordinates of plot
• col: It defines color

Returns: A QQ Line plot of the coordinates provided

## R

 `# Set seed for reproducibility``set.seed``(500)` `# Create random normally distributed values``x <- ``rnorm``(1200)` `# QQplot of normally distributed values``qqnorm``(x)` `# Add qqline to plot``qqline``(x, col = ``"darkgreen"``)`

Output: Above is a representation of QQplot of Normally Distributed Random Numbers.

## R

 `# Set seed for reproducibility` `# Random values according to logistic distribution``# QQplot of logistic distribution``y <- ``rlogis``(800)` `# QQplot of normally distributed values``qqnorm``(y)` `# Add qqline to plot``qqline``(y, col = ``"darkgreen"``)`

Output: Above is the Q-Q Plot of theoretical quantiles.

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