The density of francium hydroxide was not estimated; an approximate estimation can be made by comparison with the alkali metals hydroxides.

Luc Devroye has written:

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'A course in density estimation' -- subject(s): Estimation theory

'Nonparametric density estimation' -- subject(s): Nonparametric statistics, Distribution (Probability theory), Estimation theory

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Richard A. Tapia has written:

'Nonparametric probability density estimation' -- subject(s): Distribution (Probability theory), Estimation theory, Nonparametric statistics

Masashi Sugiyama has written:

'Density ratio estimation in machine learning' -- subject(s): COMPUTERS / Computer Vision & Pattern Recognition, Estimation theory, Machine learning

A value for porosity can alternatively be calculated from the bulk density ρbulk and particle density ρparticle:

Normal particle density is assumed to be approximately 2.65 g/cm3, although a better estimation can be obtained by examining the lithology of the particles.