Dataset:  birchpollen.dat

Source: B.F. Clegg, W. Tinner, D.G, Gavin, F.S. Hu (2005). "Morphological
Differentiation of Betula (birch) Pollen in Northwest North America and
its Palaeological Application," The Holocene, Vol. 15, #2, pp. 229-237.

Description: Grain diameters of pollen based on 5 species, with varying
numbers of locations within species (13, 6, 5, 19, 12), 
and 30 measurements per location.
Species: B. papyrifera, neoalaskana, kenaica, glandulosa, nana
Data simulated to match mean and SDs within locations. 


Variables/Columns
Grain Diameter   1-8
Species        16
Location 23-24