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SparSNP

SparSNP fits lasso-penalized linear models to SNP data. Its main features are:

  • it can fit squared hinge loss for classification (case/control) and linear regression (quantitative phenotypes)
  • takes PLINK BED/FAM files as input
  • the amount of memory is bounded - can work with large datasets using little memory (typically <1GB, more for better performance)
  • fits a model over a grid of penalties, and writes the estimated coefficients to disk
  • it can also do cross-validation, using the estimated coefficients to predict outputs for other datasets
  • efficient - it uses warm-restarts plus an active-set approach, the model fitting part of 3-fold cross-validation for a dataset of 2000 samples by 300,000 SNP dataset takes ~5min, and about 25min for ~6800 samples / ~516,000 SNPs

Contact

Gad Abraham, gad.abraham@unimelb.edu.au

Citation

G. Abraham, A. Kowalczyk, J. Zobel, and M. Inouye, ``SparSNP: Fast and memory-efficient analysis of all SNPs for phenotype prediction'', BMC Bioinformatics, 2012, 13:88, doi:10.1186/1471-2105-13-88

License

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

Copyright (C) 2011-2012 Gad Abraham and National ICT Australia (http://www.NICTA.com.au). All rights reserved.

Requirements

For the post-analysis scripts: R packages ggplot2 >=0.9.3, scales, grid, abind, ROCR

A 64-bit operating system is recommended; we have tested SparSNP on 64-bit OSX and Linux.

Quick Start

To get the latest version:

git clone git://github.com/gabraham/SparSNP

To install:

cd SparSNP
make

Run (assuming a PLINK BED/BIM/FAM dataset named MYDATA, i.e. MYDATA.bim)

export PATH=<PATH_TO_SPARSNP>:$PATH
crossval.sh MYDATA sqrhinge 2>&1 | tee log
eval.R

Documentation: see the document https://github.com/gabraham/SparSNP/blob/master/workflow.pdf

Changelog: see https://github.com/gabraham/SparSNP/blob/master/CHANGELOG

Acknowledgments

  • Marco Colombo, patches for consistent lambda1 path

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