Holdontoyourhat,Oh yes. For one example, there's a probabililty that I'm more English than you.
I suggest placing these hypothetical test results in order of relative probability, as far as the two scrapings on anyone's leggings are concerned:
- Nobody's skin cells are in either scraping.
- Nobody's skin cells are in one scraping, and somebody's skin cells are in one scraping but there aren't enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, but neither have enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, but only one scraping had enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, and both had enough cells to produce a DNA profile.
I guess its Back To School Time with all this relative probability stuff, sounds just like what the expert witness' get paid to do in court, e.g. attempt to baffle the jury with very large numbers, talk of confidence margins, Normal models, Gaussian Copula model, Long tails, Fat tails, standard deviations, 1-sigma or two, independent events or concurrent events, etc.
Accept the IDI as stated, the dna exists and it could only have originated from one of five people, its not semen dna, so we cannot assume it maps onto an unknown male.
You do not know where the touch-dna came from. there may have been two intruders, but only one transferred dna, you just do not know, either do I.
RDI may be correct and they phoned for help in the middle of the night and this third party helped redress JonBenet, thus transferring the touch-dna onto her clothing,. That explanation is as valid as the IDI?
I reckon this should be cited to you everytime you use the touch-dna to argue for the existence of an intruder.
- Nobody's skin cells are in either scraping.
- Nobody's skin cells are in one scraping, and somebody's skin cells are in one scraping but there aren't enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, but neither have enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, but only one scraping had enough cells to produce a DNA profile.
- Somebody's skin cells are in both scrapings, and both had enough cells to produce a DNA profile.
Now the problem with attempting to apply mathematics and probability to the above is that these are random events, and as far as I know nobody has developed a Skin Shedding Model, not unless you have your own Holdontoyourhat suitably trademarked Skin Shedding Model?
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