The results described in this thread relies on measuring Parkinson's using a computer keyboard. Giancardo et al. [1] have taken the work further, making it more accurate. Their system "measures the key hold times (the time required to press and release a key) during the normal use of a computer without any change in hardware and converts it to a PD motor index ... This new approach discriminated early PD groups from controls with an AUC = 0.81 (n = 42/43; mean age = 59.0/60.1; women = 43%/60%;PD/controls). The performance was comparable or better than two other quantitative motor performance tests used clinically: alternating finger tapping (AUC = 0.75) and single key tapping (AUC = 0.61)."

Their "alternating finger tapping test" is very similar to the side-to-side (QP) tap test that can be run directly from my web site. There is a stand-alone version that does not store the results at:
Parkinson's Disease Measurement: PwP, surveys, trials, analysis
And a version that stores the results in a database, which you need to register with first, at:
Parkinson's Measurement > PDMeasure: home page

Reference

[1] Giancardo, L. et al. Computer keyboard interaction as an indicator of early Parkinson's disease. Sci. Rep. 6, 34468; doi: 10.1038/srep34468 (2016).
http://www.nature.com/articles/srep34468

John