Stats tester plus

September 18, 2024

1. The status of the switching screen for [2-sided test/1-sided test] and [Continuity correction ON/OFF] are now easier to visually check. This change makes the setting status easier to understand compared to the previous version. Furthermore, the status of the setting option is highlighted at the top of the output screen after tapping the Calc button. 2. When you tap the HELP button for each test, "Explanation of each test" and "Example output screen" are displayed in succession. In previous versions, these boundaries were difficult to distinguish. This revision has made the boundaries more clear. 3. Others 1) Paired t-test: Corrected input data display disorder. 2) Shapiro test (normality test): Added explanations for the x-axis (observed value) and y-axis (expected value) to the Q-Q plot graph.

June 4, 2024

Ver 3.2.1 Wilcoxon signed rank test: Fixed a bug when test statistic (Ro) = critical value (R). Ver 3.2 1. Bonferroni multiple t-test, Kruskal-Wallis test : The screen display of the results was improved. 2. Spearman rank correlation test, Wilcoxon signed rank test: Although the final p-value was correct, the intermediate results were sometimes displayed differently. So this issue was corrected. 3. X2 test (Goodness of fit) : Added explanation to the result and graph. 4. Others: Minor improvements were made to the screen display.

June 3, 2024

Improved the following issues. 1. Bonferroni multiple t-test, Kruskal-Wallis test : The screen display of the results was improved. 2. Spearman rank correlation test, Wilcoxon signed rank test: Although the final p-value was correct, the intermediate results were sometimes displayed differently. So this issue was corrected. 3. X2 test (Goodness of fit) : Added explanation to the result and graph. 4. Others: Minor improvements were made to the screen display.

February 6, 2024

1. Test for Pearson Correlation Coefficient : Fixed freezing in very rare samples (when r=0). 2. Glossary：Added explanations of 1)Correlation, 2)Correlation coefficient, 3)Regression coefficient, 4)Coefficient of determination, and 5)Test of Pearson correlation coefficient. 3. Two-sample proportion test : Fixed a case where the result of one-sided test was not displayed. 4. Other minor improvements. 5. Due to some circumstances, the minimum iOs version has been set to 15.0.

August 20, 2023

Major changes 1. Help for all statistics tests: Added easy-to-understand explanations, including examples. (Major improvement in this version) 2. Glossary: Added and modified statistics test terms. 3. Improved display: Improved screen display on iPhone 8 plus, iPhone SE, Mac (designed for iPhone), etc. 4. Spearman correlation coefficient test: Changed to a table lookup method. 5. Other many improvements.

March 31, 2023

1. As a major update, one-tailed tests were enabled in many tests. If you turn on the "One-tailed test" option switch, the one-tailed p-value will be displayed after the two-tailed p-value. 2. For tests with continuity correction, you can use the option switch to switch between "displaying only corrected p-values" and "displaying corrected p-values + uncorrected p-values". 3. In the Wilcoxon signed-rank test, an approximation method was added in addition to table lookup in the previous version. In the new version, the table lookup method has been reinstated. However, not only has the original table (α = 0.01 and 0.05) been included, but also a table (α = 0.001 and 0.005) has been added. 4. [How to use this app], [Glossary] and [Help] for each test have been revised.

February 13, 2023

1. Wilcoxon Signed Rank Test (Paired Sample): Added the normal approximation method (with tie data correction) in addition to the table lookup method. 2. Chi-Square Test (mxn, Independence): Improved the output format to make it easier to see test results in the large table (max 10x10). 3. Multiple t-Test with Bonferroni Correction: An introduction to the Bonferroni correction method has been added to the Help screen. 4. Improved glossary and others.

January 19, 2023