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Related Concept Videos

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Multiple Comparison Tests

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Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
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The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
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The goodness-of-fit test is a type of hypothesis test which determines whether the data "fits" a particular distribution. For example, one may suspect that some anonymous data may fit a binomial distribution. A chi-square test (meaning the distribution for the hypothesis test is chi-square) can be used to determine if there is a fit. The null and alternative hypotheses may be written in sentences or stated as equations or inequalities. The test statistic for a goodness-of-fit test is given as...
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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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Selecting Multiple Biomarker Subsets with Similarly Effective Binary Classification Performances
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Improving feature selection performance using pairwise pre-evaluation.

Songlu Li1,2, Sejong Oh3

  • 1Department of Nanobiomedical Science, Dankook University, Cheonan, 330-714, Korea.

BMC Bioinformatics
|August 22, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces an improved feature selection method for high-dimensional biological data. By utilizing pairwise feature evaluations, the new approach enhances the quality of selected feature subsets, improving data characterization.

Keywords:
ClassificationFeature interactionFeature selectionFilter method

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Data Science

Background:

  • Biological datasets, like microarrays, possess numerous features, necessitating efficient feature selection.
  • Exhaustive subset evaluation is computationally infeasible, making sub-optimal feature selection a practical necessity.

Purpose of the Study:

  • To propose an improved feature selection method for high-dimensional data.
  • To enhance the quality of feature subsets by incorporating pairwise feature evaluation information.

Main Methods:

  • Modified existing feature selection algorithms to integrate pre-evaluation data.
  • Utilized information from all pairwise feature evaluations to guide the selection process.
  • Prioritized top-ranking feature pairs during subset construction.

Main Results:

  • The proposed method demonstrated improved feature subset quality compared to modified algorithms.
  • Experimental results validated the effectiveness of the pairwise evaluation approach.

Conclusions:

  • The developed feature selection technique enhances the quality of subsets for high-dimensional datasets.
  • This method is applicable to microarray data and other complex biological data types.