Download Intermediate Statistics for Geographers and Earth Scientists by R.B.G. Williams PDF

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By R.B.G. Williams

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Extra resources for Intermediate Statistics for Geographers and Earth Scientists

Example text

It will be assumed for computational simplicity that an equal number of items is ass igned to each of the a times b = ab combinations of the classes of Factors A and B. This even distribution of the n items among the different class comb inations must usuall y be achieved by design (stratification), rather than by s i mp l e random s ampl i ng . PROCEDURE 1 . Set up the null hypothe s is: the value of X of a given item is unrelated to the class of Factor A to which the item belongs. It is al so unrelated to the clas s of Fact or B.

50483 6. 09602 + (90 . 40881. The associated degrees of freedom are 3 - 1 2. 5 is actually an average based on a series of measurements, but this complication was ignored by Melton and will be ignored here. 389 Two-factor and Multi-factor Analysis of Variance 7. The sum of s qua res attributable to Fact or B i s SSB 8. 09069. The as soc ia t ed deg rees of freedom ar e 2 - 1 = 1. 9. 50) 2 + (62. 27) 2 + (40. 75) 2 3 - SSA - SSB - C 5219 10. 383233 - 34 . 09602 4 . 23681 . The assoc iat ed degrees of f r eedom are (3 - 1) (2 - 1) 11.

78 Totals North facing South facing both directions Analysis of the data is facilitated by the fact that each cell in the table contains the same number of slope measurements. l For the moment it will be assumed that the measurements (replicates) in each cell constitute a random sample of the many somewhat different measurements that a complete survey of the study area might yield (not that a complete survey is possible, since there are an infinite number of locations within the study area). In actual fact the measurements depart considerably from randomness, as will be explained in a later section.

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