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The accurate values of population parameters such as population proportion, population mean, and population standard deviation (or variance) are usually unknown. These are fixed values that can only be estimated from the data collected from the samples. The estimates of each of these parameters are sample proportion, the sample mean, and sample standard deviation (or variance). To obtain the values of these sample statistics, data are required that have particular distribution and central...
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The z and the Student t distribution estimate the population mean using the sample mean and standard deviation. However, to decide which distribution to use for a calculation, one needs to determine the sample size, the nature of the distribution, and whether the population standard deviation is known. If the population standard deviation is known and the population is normally distributed, or if the sample size is greater than 30, the z distribution is preferred. The Student t distribution is...
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A goodness-of-fit test is conducted to determine whether the observed frequency values are statistically similar to the frequencies expected for the dataset. Suppose the expected frequencies for a dataset are equal such as when predicting the frequency of any number appearing when casting a die. In that case, the expected frequency is the ratio of the total number of observations (n)  to the number of categories (k).
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Sinkhorn Distributionally Robust Conditional Quantile Prediction with Fixed Design.

Guohui Jiang1, Tiantian Mao1

  • 1Department of Statistics and Finance, School of Management, University of Science and Technology of China, Hefei 230052, China.

Entropy (Basel, Switzerland)
|June 26, 2025
PubMed
Summary

This study introduces a new data-driven method for conditional quantile prediction, called Sinkhorn distributionally robust conditional quantile prediction. It offers superior performance in practical applications, validated by numerical experiments.

Keywords:
Sinkhorn distanceconditional quantile predictiondistributionally robust optimization

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Area of Science:

  • Statistics
  • Machine Learning
  • Optimization

Background:

  • Conditional quantile prediction is crucial for understanding risk and uncertainty.
  • Existing methods may lack robustness to distributional shifts.
  • Data-driven approaches are increasingly important in statistical modeling.

Purpose of the Study:

  • To propose a novel distributionally robust framework for conditional quantile prediction.
  • To address the fixed design setting of covariates.
  • To develop an efficient computational approach for the proposed method.

Main Methods:

  • A data-driven distributionally robust framework is proposed.
  • The framework is termed Sinkhorn distributionally robust conditional quantile prediction.
  • Convex programming dual reformulation and conic optimization reformulation are derived.

Main Results:

  • The proposed method demonstrates superior performance compared to existing approaches.
  • Numerical experiments validate the effectiveness of the framework.
  • The method is highlighted for its practical applicability.

Conclusions:

  • The Sinkhorn distributionally robust conditional quantile prediction framework is effective.
  • The derived reformulations enable efficient computation.
  • The approach offers a robust solution for conditional quantile estimation.