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Parametric statistics
•
Necessary to validate assumption
•
Example: test for deviation from normality
•
Remember: p-value >0.05 not enough
lnGTVrad
6.00
5.00
4.00
3.00
2.00
1.00
.00
Frequency
15.0
10.0
5.0
0.0
Normal
Mean =
3.7738
Std. Dev. =
.83951
N =
85
Observed Cum Prob
1.0
0.8
0.6
0.4
0.2
0.0
Expected Cum Prob
1.0
0.8
0.6
0.4
0.2
0.0
Normal P-P Plot of lnGTVrad