2-17 - a false Bonferroni Correction Bonferroni ∝ of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
2 17 2011 Case Study 0502 Multiple means – f-test – ANOVA Full model – everything is there Reduced model – group things together that answer another question FULL MODEL: Separate Means model – case 0502, seven total groups REDUCED MODEL: Two Groups (Spock vs. others) How do we group? It depends on the question. NULL Hypothesis: H 0 : Reduced= Full H A : Reduced is too much F = ∆SSE∆dfMSEfull Wilcoxon Rank Sum test – similar to overall F-test (the f-statistic) Compare Means – Each Pair Student’s t Potential problem with all the means: the Alpha = 0.05: 5% of the significant things will not be significant. 1/20 chance of finding
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: a false Bonferroni Correction: Bonferroni: ∝# of comparisons = . 0 0521 = 0.0023 NOTE: Most common mistake: Not correct for multiple comparisons. Tukey: All pairs, means comparison Best: Dunnett’s: Control, difference from a control group Example: Lowest A B C D E highest A = B, B = C, A ≠ C C = D = E Homework 6 5.23 analyze FIT y by x. All the means are the same because the F Ratio is significant. [Following is not needed] All possible differences. Tukey. LSD: Stands for least significant difference. Remember: The student test doesn’t correct for the alpha, where as the tukey test does. A...
View Full Document

This note was uploaded on 10/03/2011 for the course STAT 511 taught by Professor Eggett,d during the Winter '08 term at BYU.

Page1 / 2

2-17 - a false Bonferroni Correction Bonferroni ∝ of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online