# chocjy / randomized-quantile-regression-solvers

Randomized Solvers for Large-scale Quantile Regression Problems

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# Randomized Solvers for Large-scale Quantile Regression Problems

These codes provide implementations of solvers for large-scale quantile regression problems using randomized numerical linear algebra.

Quantile regression is a method to estimate the quantiles of the conditional distribution of a response variable, and as such it permits a much more accurate portrayal of the relationship between the response variable and observed covariates than methods such as Least-squares or Least Absolute Deviations regression. It can be expressed as a linear program, and, with appropriate preprocessing, interior-point methods can be used to find a solution for moderately large problems. Dealing with very large problems, e.g. involving data up to and beyond the terabyte regime, remains a challenge. This work shows a randomized algorithm that runs in nearly linear time in the size of the input and that, with constant probability, computes a $(1+\epsilon)$ approximate solution to an arbitrary quantile regression problem.

## Codes

Implementations in MATLAB and Hadoop are provided in matlab/ and hadoop/, respectively.

## References

J. Yang, X. Meng, and M. W. Mahoney, Quantile Regression for Large-scale applications. Proc. of the 30th ICML Conference (2013).

J. Yang, X. Meng, and M. W. Mahoney. Quantile Regression for Large-scale applications. SIAM J. Scientific Computing, 36(5), S78-S110, 2014.

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Randomized Solvers for Large-scale Quantile Regression Problems