I think it's time for THH to quantify his skepticism (an "unconfidence interval") .1:750,000 for experiment, what for denial?
Otherwise it's "If there's excess heat it must be a calorimetric error" or "the mice/rats drank the electrolyte'.
Also noting that the Wright brothers' crashes (and other pilots fatalities) are not counted in the annals of flight records. THH demands the number of failed experiments, to allow a small (16?) number of positive values in a histogram.
It is pretty difficult to quantify such things, as I am sure you know!
If I were to look at any of the "good" experiments without context I would say "wow - there is something here - why has no-one pursued it!".
The context is that people have pursued it and the results continue to be as uncertain and marginal as the original ones. Which is unexpected if they are truly a nuclear effect - because one way of another that would be expected to generate an experiment somewhere with clear results - even if generating "active material" was still an unsolved problem so that only some sourced worked.
So my negativity about the experimental evidence indicating nuclear reactions comes from the totality of the evidence and the way that it always seems marginal. That history reduces my confidence in what looked like very good old experimental results (not however F&P's results - which do not look good).
As for "how could it not be nuclear" given those very good results. One thing working with complex systems tells you is that results can be misleading. Pd-D (and Pd-H) systems certainly give rise to anomalies - the question is how those are interpreted.
The way I feel about it is that those old excess heat results coming from nuclear reactions, rather than chemical driven calorimetry anomalies, is 10%. Not impossible, but not likely. That is just a feeling not scientific - no-one's quantitative evaluation of the issue can be scientific (and those who think it can be are deluding themselves). Because it is a feeling it varies between 5% and 30%. Because it is a feeling I know better than to believe it.
Two points:
1. Why are my views about any of the experiments now so different from others here? We have different contexts. If you think LENR certainly exists the chances of some random anomaly that could be LENR being LENR go up. A lot.
2. How can this evaluation be changed. It is amazing, and depressing, but all that is required is a result which is certain and replicable. LENR results of both forms exist - but not both together. If we had that any issues about it could be closed by different groups replicating with different instrumentation. It would take a while but be very doable, even if the effect was small - say calorimetry of excess heat output 10% of input energy. But of course the fact that it is so hard to scale certain results to higher COP is negative. Even if LENR requires thermal or even electrical stimulation it ought to be possible to reduce the input power for the same output - so making an excess heat effect clearer.
3. Why silence from me on the He results? I started downloading the papers. What I found was: the "polished" summary and meta-analysis results were very different from the original reported results in some cases. Now re-analysis is respectable and can always be done. But where the original results are difficult to interpret, re-analysis that makes them much closer to the expected positive results must be viewed with suspicion. Not because any nefarious intent is suggested, but because complex data can be interpreted in multiple ways, and it is understandable that a positive interpretation would be selected. So my plan for understanding He evidence is:
(1) obtain a complete list of the initial (first) write-ups of all of the relevant experiments
(2) compare them with Miles's 16 data points, try to understand the re-interpretations and any selection mechanisms where they exist.
(3) look at original experiment methodology for whether in each case the expected He results have plausible non-nuclear explanations and compare that with nuclear explanation plausibility.
It is quite a long job but I'd be more likely to do it if someone could list for me all the relevant original experiment results.
My partial list is on a different PC so I can't post now - I have thus far two papers, one from McKubre et al, one from Miles et al. But I think Miles, and maybe McK, have done multiple series of He experiments. Also there are others...
Best wishes, THH