# plot.liu: Plot of the Liu Coefficients In liureg: Liu Regression with Liu Biasing Parameters and Statistics

## Description

Plot of the Liu coefficient for scalar or vector values of biasing parameter d.

## Usage

 ```1 2``` ```## S3 method for class 'liu' plot(x, abline = TRUE, ...) ```

## Arguments

 `x` An object of class "liu". `abline` Vertical line to minimum value of MSE at certain value of biasing parameter d used as argument in `liu` function. `...` Not presently used in this implementation.

## Details

Graphical way of judging optimal value of biasing parameter d. The biasing parameter may be selected for acceptable (or minimum) value of MSE.

Nothing returned

## References

Imdad, M. U. (2017). Addressing Linear Regression Models with Correlated Regressors: Some Package Development in R (Doctoral Thesis, Department of Statistics, Bahauddin Zakariya University, Multan, Pakistan).

Imdadullah, M., Aslam, M., and Altaf, S. (2017). liureg: A comprehensive R Package for the Liu Estimation of Linear Regression Model with Collinear Regressors. The R Journal, 9 (2), 232–247.

Liu, K. (1993). A new Class of Biased Estimate in Linear Regression. Journal of Statistical Planning and Inference, 141, 189–196. http://doi.org/10.1080/03610929308831027.

Liu model fitting `liu`, Liu residuals `residuals.liu`, Liu PRESS `press.liu`, Testing of Liu Coefficients `summary.liu`, Plot of bias variance trade-off `plot.biasliu`

## Examples

 ```1 2 3``` ```mod<-liu(y~., data = as.data.frame(Hald), d = seq(-5, 5, 0.4)) plot(mod) plot(mod, abline = TRUE) ```

### Example output

```
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liureg documentation built on May 2, 2019, 8:34 a.m.