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Does adding characters with missing data increase or decrease phylogenetic accuracy?

J J Wiens1

  • 1Section of Amphibians and Reptiles, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania 15213-4080, USA. wiensj@clpgh.org

Systematic Biology
|June 18, 2002
PubMed
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Adding characters with missing data to phylogenetic analyses can improve accuracy, but benefits diminish with more missing data. Filling data gaps and prioritizing complete characters are key strategies for robust phylogenetic trees.

Area of Science:

  • Phylogenetics
  • Computational Biology
  • Evolutionary Biology

Background:

  • Missing data is a common challenge in phylogenetic analyses.
  • Fear of missing data may lead researchers to exclude potentially informative characters.

Purpose of the Study:

  • To investigate the impact of including characters with missing data on phylogenetic accuracy.
  • To determine if the benefits of increased character number outweigh the costs of missing data.

Main Methods:

  • Simulations were used to analyze phylogenetic matrices with varying proportions of missing data.
  • The study compared phylogenetic accuracy when adding characters with missing data versus complete characters.

Main Results:

  • Adding characters with missing data generally increases phylogenetic accuracy, but this benefit decreases as the proportion of missing data rises.

Related Experiment Videos

  • In some cases, missing data can decrease accuracy by mimicking issues seen with limited taxon sampling.
  • Maximizing data completeness within a matrix and prioritizing characters scored for more taxa are effective strategies.

    • Conclusions:

    • The strategic inclusion of characters with missing data can enhance phylogenetic accuracy, provided the proportion of missing entries is managed.
    • Prioritizing data completeness and character coverage is crucial for reliable phylogenetic inference.
    • Excluding incomplete taxa is a less effective strategy for improving phylogenetic accuracy compared to managing incomplete characters.