Abstract
This chapter presents sampling from inhomogeneous universes. It might be rather difficult to avoid nonrandom sampling. Locations that are important for random sampling of rock specimens or fossils may be inaccessible. It might be difficult to differentiate a sample composed of globular and needle-shaped particles into representative grain-size classes. In any situation, nonrandom sampling may be difficult if a universe is a blend of different basic populations. Such a universe is termed inhomogeneous. Inhomogeneous distributions are the investigated property that displays large variations. The geological body seems to be built-up of at least two homogeneous distributions of possibly different genetic origin. Samples from different locations differ significantly. In a more detailed analysis, pairs and triples of samples, etc., are compared that may be used to determine the number of homogeneous distributions that are blended to a heterogeneous population.
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