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Table 4

The optimum number of tracer selected by the stepwise DFA

Variable entered/removeda,b,c,d
StepElementStatisticdf1df2df3F-value
Statisticdf1df2df3
Mn 0.002 12 26 962.13 12 26 
Ti 12 26 220.57 24 50 
Ca 12 26 114.801 36 71.64 
Cr 12 26 70.375 48 90.64 
Ba 12 26 54.777 60 106.8 
Eu 12 26 43.862 72 120.1 
Gd 12 26 36.754 84 130.5 
Cu 12 26 34.567 96 138.3 
Fe 12 26 30.991 108 143.6 
10 Pb 10 12 26 28.024 120 146.7 
Variable entered/removeda,b,c,d
StepElementStatisticdf1df2df3F-value
Statisticdf1df2df3
Mn 0.002 12 26 962.13 12 26 
Ti 12 26 220.57 24 50 
Ca 12 26 114.801 36 71.64 
Cr 12 26 70.375 48 90.64 
Ba 12 26 54.777 60 106.8 
Eu 12 26 43.862 72 120.1 
Gd 12 26 36.754 84 130.5 
Cu 12 26 34.567 96 138.3 
Fe 12 26 30.991 108 143.6 
10 Pb 10 12 26 28.024 120 146.7 

1. The shown F-values for all steps are approximated with exception to steps 1 and 2 that are exact F-values.

2. At each step, the variable that minimises the overall Wilks' lambda is entered.

a. Maximum number of steps is 26.

b. Minimum partial F to enter is 3.84.

c. Maximum partial F to remove is 2.71.

d. F level, tolerance, or VIN insufficient for further computation.

3. The classification output shows 97.4% of original grouped cases correctly classified.

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