# Perform Linear Regression Analysis in R Programming – lm() Function

`lm()` function in R Language is a linear model function, used for linear regression analysis.

Syntax: lm(formula)

Parameters:
formula: model description, such as x ~ y

Example 1:

 `# R program to illustrate ` `# lm function ` ` `  `# Creating two vectors x and y ` `x <``-` `c(rep(``1``:``20``)) ` `y <``-` `x ``*` `2` ` `  `# Calling lm() function to ` `# fit a linear model ` `f <``-` `lm(x ~ y) ` ` `  `# Getting linear model ` `f `

Output:

```Call:
lm(formula = x ~ y)

Coefficients:
(Intercept)            y
1.589e-15    5.000e-01
```

Example 2:

 `# R program to illustrate ` `# lm function ` ` `  `# Creating two vectors x and y ` `x <``-` `c(``2``, ``4``, ``6``, ``8``) ` `y <``-` `c(``1``, ``3``, ``5``, ``7``) ` ` `  `# Calling lm() function to ` `# fit a linear model ` `f <``-` `lm(y ~ x) ` ` `  `# Getting linear model ` `f `

Output:

```Call:
lm(formula = y ~ x)

Coefficients:
(Intercept)            x
-1            1
```
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