Articles
5 articles on vahaduo, ancient-DNA research written up for readers who want the evidence, not just the headline.
Vahaduo is the free browser tool most people use with Global25 coordinates: paste a row and a source list, and its Distance, Single, Multi and PCA tabs return nearest populations, a single-source fit, a multi-source mixture and a plot. It runs the nMonte tradition of Monte-Carlo mixture fitting in the browser, with no account and no upload. Because it will fit any panel you give it, the discipline of building the panel is the whole job.
The articles walk through Vahaduo tab by tab, explain the nMonte R script it descends from and what nMonte3 changed, set out calibrated bands for reading a fit distance and why lower stops being better, demonstrate how adding sources improved a fit from 0.0110 to 0.0068 while the story collapsed, and compare Vahaduo, nMonte and the Ancestrify Lab as the free toolbox for a Global25 row.
Run the same fits in the free admixture lab
The fit distance measures how far a mixture still sits from your coordinate — not whether the model is right. Calibrated bands for reading one, why lower stops being better, and the checks that actually validate a model.
Adding sources always lowers a G25 fit distance and routinely worsens the model — a worked demonstration where the fit improved from 0.0110 to 0.0068 while the story collapsed. The rules that keep a panel honest.
Ger Huijbregts's nMonte turned Global25 rows into ancestry percentages and founded a whole tool tradition. How the Monte-Carlo search works, what nMonte3 changed, what the fit distance is, and the discipline the script never enforces.
Everything you can do with a Global25 row without paying anyone: distance rankings, admixture fits, PCA plots, averaging, authenticity checks — Vahaduo, nMonte and the Ancestrify Lab, honestly compared.
A step-by-step Vahaduo tutorial: where to paste your Global25 coordinates, how the Distance, Single, Multi and PCA tabs work, how to build a source panel, and how to read a fit distance without over-reading it.