Coal is not homogeneous substance, but the mixture of particles which have different ash percent respectively. Therefore all characters of any coal should be offered with analytical content throughout all ash percent.
It is very worthy that it shows the regression equation between each character and ash, as generaly any original coal is divided into several goods which take different ash.
The author explained that there are many mistakes in the ordinary method de-pending on a measured value at one point of ash, when estimate the coalification degree, the nature of other ash coal or the constituents of ash.
The significant levels of these regression equations on same original coals are less than 1%, with exception of only a few.
Furthermore, the standard error of the estimate from any regression equation is almost less than the permissible difference of Jis on the proximate and ultimate analysis.
Therefore, almost all characters could be treated as the functione of ash content, so far as same original coals are examined, especialy on Japanese coals.
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