# A Package for Sparse VAR/VECM Estimation

A wrapper for sparse VAR/VECM time series models estimation using penalties like ENET, SCAD and MCP.

Some R functions useful to estimate sparse VAR / VECM models.

### Installation

To install the stable version from CRAN:

To install the developing version:

Check here to understand which are the dependencies of `devtools` for your OS.

### Quick start

To load the `sparsevar` package simply type

Using the function included in the package, we simply generate a 20x20 VAR(2) process

This command will generate a model with two sparse matrices with 5% of non-zero entries and a Toeplitz variance-covariance matrix with rho = 0.5. We can estimate the matrices of the process using for example

The results can be seen by plotting the two `var` objects

the first row of the plot is made by the matrices of the simulated process and the second row is formed by their estimates.

The fit contains also the estimate of the variance/covariance matrix of the residuals

which can be compared with the covariance matrix of the errors of the generating process

### Usage

The functions included for model estimation are:

• `fitVAR`: to estimate a sparse VAR multivariate time series with ENET, SCAD or MC+;
• `fitVECM`: to estimate a sparse VECM (Vector Error Correction Model) using LS with penalty (again: ENET, SCAD or MC+);
• `impulseResponse`: compute the impulse response function;
• `errorBands`: estimate the error bands for the IRF (using bootstrap);

For simulations:

• `simulateVAR`: to generate a sparse VAR multivariate time series;
• `createSparseMatrix`: used to create sparse matrices with a given density;

For plotting:

• `plotMatrix`: useful to plot matrices and sparse matrices;
• `plotVAR`: plot all the matrices of the model or models in input;
• `plotIRF`: plot IRF function;
• `plotGridIRF`: multiple plots of IRF.

### References

[1] Basu, Sumanta; Michailidis, George. Regularized estimation in sparse high-dimensional time series models. Ann. Statist. 43 (2015), no. 4, 1535--1567. doi:10.1214/15-AOS1315.

# sparsevar 0.0.10

• Removed plotComparisonVAR (substituted by plotVAR)
• Added the option to generate VARs with given matrices
• Fixed AIC
• Fixed problems with error bands options

# sparsevar 0.0.9

• Fast SCAD estimation (using picasso package; works only with SCAD and timeSlice)
• Added function to compute VAR forecasts
• Added information criteria (AIC, SChwartz and Hannan-Quinn)
• Fixed mean estimation for timeSlice

# sparsevar 0.0.7

• Major code rewriting
• Remove dependecies from MTS and caret
• Added impulse response error bands (using bootstrap)
• Added plot functions for IRF
• New timeSlice estimation
• Removed repeated cross validation

# sparsevar 0.0.6

• Added impulse response function for VAR processes

# sparsevar 0.0.5

• Fixed normalization constant in creating sparse var matrix
• Fixed parallel backend in Windows

# sparsevar 0.0.4

• Added as output the residuals of the estimation (for estimateVAR)
• Fixed parallel background in LASSO estimation
• Now repeatedCV returns MSE

# Reference manual

install.packages("sparsevar")

0.0.10 by Simone Vazzoler, 2 years ago

http://github.com/svazzole/sparsevar

Report a bug at http://github.com/svazzole/sparsevar

Browse source code at https://github.com/cran/sparsevar

Authors: Simone Vazzoler [aut, cre], Lorenzo Frattarolo [aut], Monica Billio [aut]

Documentation:   PDF Manual