## 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 by an easy and simple 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 Sheet 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 Sheet Google Drive 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.

Currently following statistics test are supported.

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


* Parametric statistics:

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

2. SD-SEM Conversion
(Convert SD(standard deviation) to SEM(standard error) and convert SEM to SD.)

3. t-test (One-sample t-test)
(The difference between 1 sample mean and population mean can be tested)

4. t-test (Paired t-test)
- Paired t-test for paired 2 groups

5. t-test (Student's and Welch's)
- Mean SEM and SD
- F-test to compare 2 variances
- Student's t-test
- Welch's procedure when both variance is not equal

6. F-test for equality of 2 variances
- Mean and SD
- F-test

7. One-way analysis of variance (ANOVA)
- Mean and SEM
- ANOVA

8. Multiple t-test with Bonferroni's correction
- Mean SEM and ANOVA
- Multiple comparisons

9. Correlation Regression and test
- Correlation coefficient
- Regression coefficent
- Coefficient of determination
- Test for correlation


* Nonparametric statistics:

1. Median Range and Quartiles etc
- Median
- Range
- Minimum
- First Quartile
- Second Quartile (Median)
- Third Quartile
- Maximum
- Quartile deviation

2. Mann-Whitney's U test
(U-test for difference of distribution between 2 groups)

3. Sign Test

4. Wilcoxon's signed-rank test
(paired 2 groups)

5. Chi-square test (Goodness of Fit)

6. Chi-square test(Independence 2x2)

7. McNemar's test (paired case)

8. Fisher's exact test


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* Major update

Ver 1.6.1(2017.04.03)
+ Graphic function was added to "t-test (Student's and Welch's)" and "Correlation and Regression".

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

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

Ver 1.2.0 (2016.12.03)
+ "Multiple t-test(Bonferroni's correction)" was added.
+ "One-way analysis of variance (ANOVA)" was updated.

Ver 1.1.2 (2016.10.29)
+ "F-test for equality of 2 variances" was added.
+ "One-way analysis of variance (ANOVA)" was added.
+ "Fisher's exact test" was added.

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

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

Ver 1.0 (2016-07-15) release