Stats Tester: statistics test

## Important information for Samsung users ##

On some Samsung GALAXY models, there may be no decimal, minus or space key on the numeric keyboard. In that case, please install Google Keyboard from the Play Store and try it as the default keyboard. This also solves similar problems in other calculation apps.

By using Stats Tester, you can do statistics calculation and analysis (hypothesis test) by an easy operation.

You can put data into the Data-window by using a keyboard or by pasting data from this app (other statistics methods) or other apps (e.g. Text editors and Google Sheet).

Except for the frequency data, the maximum number of samples that can be processed is 100. When entering a lot of data, it is convenient to paste data from Google Sheets, etc. Original data can be saved as files.

A [Calc] button performs calculation and displays results to Result-window. Data on Result-window can be shared by some other apps (e.g. Mailers, Google Sheets etc).

Each statistics method has useful [Help] and [Example] buttons.

Entered data and results calculated by each method are memorized until the next use. This function is a feature of this app and it is very convenient.

This app can be used for basic statistics, biostatistics, medical statistics and clinical statistics.


## Acknowledgment: The AChartEngine library distributed under the Apache 2.0 license was utilized to make chart.
http://www.achartengine.org
http://www.apache.org/licenses/LICENSE-2.0.html


* Parametric statistics:

1. Mean, SEM and SD, etc
- Arithmetic, Geometric and Harmonic means
- Confidence interval (CI)
- Sum
- Sum of Square
- Variance
- Skewness
- Kurtosis

2. SD-SEM Conversion
(Converter between Standard Deviation and Standard Error)

3. One-sample t-test

4. Paired t-test

5. t-test (Student and Welch)

6. F-test for equality of 2 variances

7. Levene test for homogeneity of variance

8. One-way ANOVA

9. Multiple t-test (with Bonferroni's correction)

10. Correlation and Regression
- Correlation coefficient
- Regression coefficient
- Test for correlation coefficient


* Nonparametric statistics:

1. Median, Range and Quartiles, etc

2. Mann-Whitney's U test

3. Kruskal-Wallis test and multiple comparisons

4. Sign Test

5. Wilcoxon's signed-rank test

6. Chi-square test (Goodness of Fit)

7. Chi-square test(Independence, 2x2)

8. McNemar's test (paired case)

9. Fisher's exact test

10. Spearman rank correlation coefficient

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* Major update

Ver 2.0.1(2017.07.20)
+ [Spearman rank correlation coefficient] added.
+ Graphic function added to [Levene test], [Mann-Whitney U test], [Kruskal-Wallis test] and [Chi-square test (Goodness of Fit)].

Ver 1.6.4(2017.06.18)
+ Box plot added to "Median, Range, Quartile".
+ "Levene test for homogeneity of variance" and "Kruskal-Wallis test and Multiple comparisons" added.
+ Bugs in Clear button (V 1.6.3) fixed.

Ver 1.6.3(2017.05.17)
+ Graphic function added to "1 sample t-test", "Paired t-test" and "F-test".
+ Fixed keyboard bug (V 1.5.2) in tablet.

Ver 1.6.2(2017.04.25)
+ Graphic function added to "Mean, SEM", "1-way ANOVA" and "Multiple t-test".

Ver 1.6.1(2017.04.03)
+ Graphic function added to "t-test (Student and Welch)" and "Correlation and Regression".

Ver 1.5.2 (2017.02.02)
+ App renamed to "Stats Tester" from "EasyStatCalc".
+ "Chi-square test (Goodness of Fit)" added.

Ver 1.3.1 (2017.01.03)
+ "SD-SEM conversion" added.
+ "1-sample t-test " added.

Ver 1.2.0 (2016.12.03)
+ "Multiple t-test(Bonferroni)" added.
+ "1-way ANOVA" updated.

Ver 1.1.2 (2016.10.29)
+ "F-test" added.
+ "1-way ANOVA" added.
+ "Fisher's exact test" added.

Ver 1.1.1 (2016.09.29)
+ "Sign test" added.
+ Followings added to "Mean, SEM".
- Skewness
- Kurtosis
- Geometric and Harmonic mean

Ver 1.0.9 (2016-08-30)
+ "McNemar test" added.

Ver 1.0 (2016-07-15) 1st release.