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Parametric statistics
•
Necessary to validate assumption
•
Example: test for deviation from normality
•
Remember: p-value >0.05 not enough
GTVrad
250.00
200.00
150.00
100.00
50.00
.00
Frequency
25.0
20.0
15.0
10.0
5.0
0.0
Normal
Mean =
58.1428
Std. Dev. =
43.04318
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 GTVrad