cragg_donald {cragg} | R Documentation |

## Calculate the Cragg-Donald statistic for a given model.

### Description

Calculate the Cragg-Donald statistic for a given model.

### Usage

```
cragg_donald(X, D, Z, data = data.frame())
```

### Arguments

`X` |
(formula). A one-sided formula of control variables. |

`D` |
(formula). A one-sided formula of endogenous variables (treatments) |

`Z` |
(formula). A one-sided formula of instruments |

`data` |
(dataframe). An optional dataframe, list, or environment containing the variables used in the model. As with many of the base R functions, if the variables are not found here, they may be searched for in the environment cragg_donald() was called. |

### Value

(cd_test) results object of class "cd_test"

### Examples

```
#Obtain the Cragg-Donald statistic for a model that instruments
#Sepal Width on Petal Length, Petal Width, and Species, while controlling
#for Sepal.Length (a toy example).
cragg_donald(X=~Sepal.Length, D=~Sepal.Width,
Z=~Petal.Length + Petal.Width + Species, data = iris)
```

[Package

*cragg*version 0.0.1 Index]