Counting and Sampling Errors in Modal Analysis by Point Counter |
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| Authors: | SOLOMON M |
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| Institution: | Department of Geology, University of Tasmania Hobart |
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| Abstract: | There are three principal sources of errors involved in modalanalyses by point counting: (a) operator variation, (b) thedetermination of area by grid counting, (c) the determinationof volumes from areal analyses. Operator variation is likely to be negligible but (b) and (c)may combine to give a variance equal to, or less than
 where A=measurement area, a=grid spacing, R=grain radius, andp=the fraction of the particular mineral in the rock (Hasofer,1963). |
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