Simulated data set.

## Format

A data frame with 121 observations on the following 4 variables.

- x1
a numeric vector

- x2
a numeric vector

- x3
a numeric vector

- y1
a numeric vector

- y2
a numeric vector

- y3
a numeric vector

- y4
a numeric vector

- y5
a numeric vector

- y6
a numeric vector

- y7
a numeric vector

- y8
a numeric vector

- y9
a numeric vector

- y10
a numeric vector

- y11
a numeric vector

- y12
a numeric vector

## Examples

```
library(ggplot2)
ggplot(association, aes(x = x1, y = y1)) +
geom_point()
ggplot(association, aes(x = x2, y = y4)) +
geom_point()
ggplot(association, aes(x = x3, y = y7)) +
geom_point()
```