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:: Free Statistics Software (Calculator) - Web-enabled scientific services & applications ::

All rights reserved. The non-commercial (academic) use of this software is free of charge. The only thing that is asked in return is to cite this software when results are used in publications.

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Here you find a collection of Free R Software (Calculators) for the purpose of Statistics Education. These R modules have been created by Prof. Dr. Ian Holliday at Aston University, Birmingham, UK.

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Workshop 1 - Using Histograms & QQplots
(graphically investigate sample distributions)
Histogram & QQplotscomputes the Histogram and QQplot for a univariate data series.

Workshop 2 - Data Screening
Histogram & QQplotscomputes the Histogram and QQplot for an univariate data series. The default data was taken from a study by Peter Reddy and Liz Moores from Aston University on the benefits of taking a placement year (Reddy & Moores, 2006).
Boxplot & Trimmed Meanscomputes a BoxPlot for a data series classed by a factor variable. The default data was taken from a study by Peter Reddy and Liz Moores from Aston University on the benefits of taking a placement year (Reddy & Moores, 2006).

Workshop 3 - Descriptive Statistics
(about the Carolina Educational Study Dataset)
Boxplots & Scatterplot Matrixcomputes a boxplot for each variable (by column) and a matrix of scatterplot for each pair of variables. The data vectors were abstracted from the study dataset Bibliographic Citation: Ramey, Craig T., James J. Gallagher, Frances A. Campbell, Barbara H. Wasik, and Joseph J. Sparling. CAROLINA ABECEDARIAN PROJECT AND THE CAROLINA APPROACH TO RESPONSIVE EDUCATION (CARE), 1972-1992 [Computer file]. ICPSR version. Chapel Hill, NC: University of North Carolina [producer], 2002. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2004.
Simple Z-Testcomputes the z-score and probability of occurence of a specified value against a user-defined normal distribution.

Workshop 4 - Correlation Analysis
(about Cognition in Pregnancy: Perceptions and Performance)
Correlationscomputes the following statistics: Pearson Correlation, Spearman Correlation rho, Kendall Correlation tau. The default data were abstracted from Crawley, R., Cognition in Pregnancy: Perceptions and Performance, 2005-2006 [computer file]. Colchester, Essex: UK Data Archive [distributor], March 2007. SN: 5615. This R module is used in Workshop 4 of the PY2224 statistics course at Aston University, UK.

Workshop 5 - Wilcoxon-Mann-Whitney Test
(testing for a 'Location Difference' between two samples)
Wilcoxon-Mann-Whitney Testcomputes the Wilcoxon-Mann-Whitney Test. This R module is used in Workshop 5 of the PY2224 statistics course at Aston University, UK.
Kolmogorov-Smirnov Testcomputes the Kolmogorov-Smirnov Test. This R module is used in Workshop 5 of the PY2224 statistics course at Aston University, UK.

Workshop 6 - T-Tests and Effect Size
T-Testscomputes the one- and two-sided T-Tests about the difference of means. This R module is used in Workshop 6 of the PY2224 statistics course at Aston University, UK.

Workshop 7 - Pearson's Chi-Square Test
Chi-Square Testscomputes the Pearson Chi-Square Test and the Exact Pearson Chi-Square Test by Simulation. This R module is used in Workshop 7 of the PY2224 statistics course at Aston University, UK.

Workshop 8 - One-Way-Between-Groups ANOVA
One Factor ANOVAcomputes the One-Way-Between-Groups ANOVA, Levene's Test for Equality of Variances, and Tukey's HSD (Honestly Significant Difference) Test. This R module is used in Workshop 8 of the PY2224 statistics course at Aston University, UK.

Workshop 9 - Two-Way ANOVA and Simple Linear Regression
Two Factor ANOVAcomputes the Two-Way ANOVA, Levene's Test for Equality of Variances, and Tukey's HSD (Honestly Significant Difference) Test. This R module is used in Workshop 9 of the PY2224 statistics course at Aston University, UK.
Simple Regressioncomputes the Simple Linear Regression Model (with one explanatory variable). This R module is used in Workshop 9 of the PY2224 statistics course at Aston University, UK.

Workshop 10 - Mixed Within-Between Two-Way ANOVA
Mixed Two Factor ANOVAcomputes the Mixed Within-Between Two-Way ANOVA, Mauchly's Sphericity Test, and the Sphericity Corrections using Greenhouse-Geisser values (GG) or Huynh-Feldt (HF). This R module is used in Workshop 10 of the PY2224 statistics course at Aston University, UK.





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To cite Wessa.net in publications use:
Wessa, P. (2014), Free Statistics Software, Office for Research Development and Education,
version 1.1.23-r7, URL http://www.wessa.net/

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Information provided on this web site is provided "AS IS" without warranty of any kind, either express or implied, including, without limitation, warranties of merchantability, fitness for a particular purpose, and noninfringement. We use reasonable efforts to include accurate and timely information and periodically update the information, and software without notice. We make no warranties or representations as to the accuracy or completeness of such information (or software), and it assumes no liability or responsibility for errors or omissions in the content of this web site, or any software bugs in online applications. Your use of this web site is AT YOUR OWN RISK. Under no circumstances and under no legal theory shall we be liable to you or any other person for any direct, indirect, special, incidental, exemplary, or consequential damages arising from your access to, or use of, this web site.

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