statistical power is…
DESCRIPTION
Statistical power is…. Statistical power is…. …the probability of being able to detect (through statistical significance testing) an effect of a specified magnitude. Scenario. Student 1: So how’s the big “D” going?. Scenario. Student 1: So how’s the big “D” going? - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/1.jpg)
Statistical power is…
![Page 2: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/2.jpg)
Statistical power is…
…the probability of being able to detect (through statistical significance testing) an effect of a specified magnitude.
![Page 3: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/3.jpg)
Scenario
• Student 1: So how’s the big “D” going?
![Page 4: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/4.jpg)
Scenario
• Student 1: So how’s the big “D” going?
• Student 2: I just ran the correlation between my two measures. The correlation is .65, but darn it, it’s not significant, and my advisor tells me that I can’t get my degree until I have significant results.
![Page 5: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/5.jpg)
Scenario
• Student 1: So how’s the big “D” going?
• Student 2: I just ran the correlation between my two measures. The correlation is .65, but darn it, it’s not significant, and my advisor tells me that I can’t get my degree until I have significant results.
• Student 1: Bummer. You are a loser!
![Page 6: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/6.jpg)
Scenario
• Student 1: So how’s the big “D” going?
• Student 2: I just ran the correlation between my two measures. The correlation is .65, but darn it, it’s not significant, and my advisor tells me that I can’t get my degree until I have significant results.
• Student 1: What was your sample size?
![Page 7: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/7.jpg)
Scenario
• Student 1: So how’s the big “D” going?
• Student 2: I just ran the correlation between my two measures. The correlation is .65, but darn it, it’s not significant, and my advisor tells me that I can’t get my degree until I have significant results.
• Student 1: What was your sample size?
• Student 2: I had 8 subjects.
![Page 8: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/8.jpg)
Scenario
• Student 1: So how’s the big “D” going?
• Student 2: I just ran the correlation between my two measures. The correlation is .65, but darn it, it’s not significant, and my advisor tells me that I can’t get my degree until I have significant results.
• Student 1: What was your sample size?
• Student 2: I had 8 subjects.
• Student 1: You miserable fool! …
![Page 9: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/9.jpg)
= d x f (N) = d (N-1) 1/2
= ρ (N-1) 1/2
![Page 10: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/10.jpg)
Graphical Data Displays and Interpretation
2012
November 14
![Page 11: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/11.jpg)
![Page 12: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/12.jpg)
![Page 13: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/13.jpg)
John Tukey (1977), Exploratory Data Analysis.
Edward Tufte, The Visual Display of Quantitative Information.
![Page 14: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/14.jpg)
John Tukey (1977), Exploratory Data Analysis.
Edward Tufte, The Visual Display of Quantitative Information.
![Page 15: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/15.jpg)
![Page 16: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/16.jpg)
![Page 17: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/17.jpg)
![Page 18: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/18.jpg)
![Page 19: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/19.jpg)
![Page 20: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/20.jpg)
![Page 21: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/21.jpg)
![Page 22: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/22.jpg)
![Page 23: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/23.jpg)
![Page 24: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/24.jpg)
Tufte Principles of Graphical Excellence
Graphical excellence is the well-designed presentation of interesting data -- a matter of substance, of statistics, and of design.
Graphical excellence consists of complex ideas communicated with clarity, precision, and efficiency.
Graphical excellence is that which gives to the viewer the greatest number of ideas in the shortest time with the least ink in the smallest space.
Graphical excellence is nearly always multivariate.
Graphical excellence requires telling the truth about the data.
![Page 25: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/25.jpg)
![Page 26: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/26.jpg)
![Page 27: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/27.jpg)
![Page 28: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/28.jpg)
Reading Comprehension
0 1 2 3 4 5 6GRADE
3
4
5
6
7
8
9
10
11
12
Age
Eq
uiv
ale
nt S
core
English-OnlyBilingual
Program
0 1 2 3 4 5 63
6
9
12
Figure 6
“White space”
![Page 29: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/29.jpg)
English oral proficiency, reading and writing development and redesignation probability from LEP to FEP as a function of grade level. District A.
0 1 2 3 4 5 6 7GRADE
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
Me
an
Sco
re, 1
= C
r ite
r io
n
Oral EnglishReadingWritingRedesignation
Measure
Figure 2
![Page 30: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/30.jpg)
Increased ELP growth
30
![Page 31: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/31.jpg)
Graphical Excellence Awarddeadline: NEXT CLASS
• Find an example of graphical excellence that tells a story in a simple, elegant manner.
• Or… find a real dog of an example from which we can learn what not to do.
![Page 32: Statistical power is…](https://reader035.vdocuments.site/reader035/viewer/2022062500/56815188550346895dbfc19f/html5/thumbnails/32.jpg)
Happy Thanksgiving break!(in the spirit of hideous graphics)