Quantitative Methods 2017
Parametric statistics
• Necessary to validate assumption • Example: test for deviation from normality • Remember: p-value >0.05 not enough
Normal P-P Plot of lnGTVrad
Normal
1.0
Mean = 3.7738 Std. Dev. = .83951 N = 85
15.0
0.8
10.0
0.6
Frequency
0.4
Expected Cum Prob
5.0
0.2
0.0
0.0
0.0
0.2
0.4
0.6
0.8
1.0
.00
1.00
2.00
3.00
4.00
5.00
6.00
Observed Cum Prob
lnGTVrad
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