Version history
Correlation Confidence Intvls
29
ASO score
Text
29/100
Reviews
0/100
Graphic
60/100
Other
0/100
App Rating
Votes
App Age
12y 9m
Last Update
Apr 23, 2022
Compare with Category Top Apps
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Metrics
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Current App
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Category Top Average
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Difference
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|---|---|---|---|
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Rating
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0
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4.47
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Number of Ratings (Voted)
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0
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752.9K
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App Age
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12y 9m
|
6y 4m
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+100%
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Price
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$1
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$0
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In-app Purchases Price
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$0
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$37
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Update Frequency
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1346d
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38d
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+3 446%
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Title Length
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29
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25
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+16%
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Subtitle Length
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0
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27
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Description Length
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1 484
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2 595
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-43%
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Number of Screenshots
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344
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999
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-66
%
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Size
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2MB
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168MB
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-99
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Category Ranking in United States
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Last year
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| Top | Dec 21, 2025 | Dec 28, 2025 |
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Ranking Keywords in United States
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Text ASO
Title
(
Characters:
29
of 30
)
Correlation Confidence Intvls
Subtitle
(
Characters:
0
of 30
)
Description
(
Characters:
1484
of 4000
)
Correlation is a quantitative tool commonly used by researchers to separate data sets into independent subgroups. Hypothesis testing determines whether or not the subgroups are numerically distinct. The degree to which the researcher can say the subgroups are distinct depends upon the overlap between the subgroups measured by the confidence interval estimates. The confidence interval estimates reflect the reality that there are errors in all quantitative estimates.
If correlation estimates were normally distributed, estimates of confidence intervals would be straightforward. However, correlation estimates are bound within the range of –1.0 to +1.0. The common technique devised by R.A. Fisher involves a nonlinear transformation of correlation functions into random variables that are approximately normal. The technique is known as Fisher's z-transformation and is formally expressed as ρ = tanh(z), where tanh( ) is the hyperbolic tangent function.
More simply, the transformed standard error, z, is defined as z = (1/2) ln[ (1 + ρ) / (1 – ρ) ]. The variance is a function of the number of paired samples in the sets being correlated and is defined as var(z) = 1 / (n – 8/3).
Thus, for example, the 95% confidence interval around a correlation estimate would be from (z – 1.96 σ) to (z + 1.96 σ) where σ = sqrt( 1/ (n – 8/3) ).
The iPad version allows you to add, retrieve, reorder, or delete data sets. Also, you may email, send via texting, and print data and results.}
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Other
Additional Information
Version history
8.1
Apr 23, 2022
- Corrected colors in Dark mode.
- Fixed problem that prevented sharing of PDF output.
- Various GUI tweaks.
8.0
Feb 04, 2022
- Update to accommodate latest versions of iOS.
- Some code simplifications.
- Removed links to Facebook and Twitter.
- Various GUI tweaks.
