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Pedigree Completeness Formula:
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The Pedigree Completeness Percentage measures how complete a genealogical record is by comparing the number of known ancestors to the total possible ancestors in a given number of generations. It helps assess the quality and completeness of family history research.
The calculator uses the pedigree completeness formula:
Where:
Explanation: This simple ratio provides a quantitative measure of how thoroughly a pedigree has been researched and documented.
Details: Pedigree completeness is crucial for genetic studies, inheritance patterns analysis, and understanding family medical history. A higher percentage indicates more reliable genealogical data.
Tips: Enter the number of known ancestors and the total possible ancestors for the generations being analyzed. Both values must be positive integers, with known ancestors not exceeding total possible.
Q1: How do I determine total possible ancestors?
A: For n generations back, total possible ancestors = 2^n - 1 (excluding the proband). For example, 3 generations back = 15 possible ancestors.
Q2: What is considered a good pedigree completeness percentage?
A: Generally, 80%+ is excellent, 60-79% is good, 40-59% is fair, and below 40% indicates significant gaps in research.
Q3: Why might my percentage be low?
A: Common reasons include adoption, incomplete records, name changes, migration, or recent immigrant ancestry with overseas records.
Q4: Does this account for pedigree collapse?
A: No, this is a simple count-based calculation. Pedigree collapse (when ancestors appear multiple times) requires more complex analysis.
Q5: Can I use this for animal pedigrees?
A: Yes, the same formula applies to animal breeding pedigrees to assess genetic diversity and breeding program completeness.