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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.

Wessa.net offers these software applications free of charge:

Descriptive Statistics SoftwareThis collection of Free Statistics Calculators offers a wide range of descriptive and explorative types of statistical measures and analysis: Central Tendency, Average, Mean, Median, Variability, Interquartile Range, Concentration, Lorenz Curve, Gini Coefficient, Skewness, Kurtosis, Quartiles, Percentiles, Notched Boxplot, Histogram, Correlation, Partial Correlation, Rank Correlation (Spearman and Kendall), Simple Regression, Kernel Density Estimation, Harrell-Davis Quantiles, Bivariate KDE, Correlation Matrix, Stem-and-leaf plot, Explorative Data Analysis
Regression SoftwareThis is a collection of Regression-based types of analysis for single and multiple equations: Multiple Regression Equations, Bias-Reduced Logistic Regression (Firth method), Recursive Partitioning (Classification & Regression Trees), Variance-based Structural Equation Modeling (Partial Least Squares - Path Modeling).
Statistical DistributionsFeatures Random Number Generators, PPCC Plots (incl. Tukey lambda), and Statistical Distribution Fitting Modules (Maximum Likelihood) for a series of important distributions: Beta, Inverted Beta, Cauchy 1, Cauchy (2 parameters), Chi, Chi Square (1 parameter), Chi Square (2 parameters), Erlang, Exponential, Fisher F, Gamma, Inverted Gamma, Gumbel, Laplace, Logistic, Lognormal, Normal, Pareto, Power, Rayleigh, r-Distribution, Rectangular (Uniform), Student t, Triangular, and Weibull.
Statistical Hypothesis Testing SoftwareOffers statistical testing of a variety of hypotheses: Population Mean, Mean (critical value, p-value, type II error, sample size), Skewness/Kurtosis, Quasi Random-Walk
Time Series Analysis (R modules)Performs Univariate Box-Jenkins ARIMA modeling, forecasting, and residual model checking. In future this module will replace the old versions based on C code.
Statistics Education at Simon Fraser University

This section contains various types of Statistics Software for Statistics Education that have been created by Larry Weldon at Simon Fraser University, Vancouver, Canada.
Statistics Education at Aston University

This section contains various types of Statistics Software for Statistics Education that have been created by Ian Holliday at Aston University, Birmingham, UK.
Mathematical Equation PlotterPlots mathematical equations, statistical distributions, derived functions, cumulative functions, and apply numerical integration. Equations can be formulated in algebraic form, for instance: y=exp(a*sin(x)+b). The equation is sent through an interpreter and the analysis and equation chart is generated (in .png format).
Time Series DatabaseUse this Database to gain access to thousands of time series about financial markets. Note: this application is also available from within our Scientific Forecasting Software.
R modulesAnyone can create, maintain, and publish R-based modules (subject to editorial acceptance) and make them freely available within the Wessa.net framework.

Multiple Regression Software (C module)Performs Multiple Regression Equation Modeling with the following features: Ordinary Least Squares Estimation, Heteroskedasticity tests, Autocorrelation tests, Misspecification tests, Multicollinearity tests, Regression Charts, ANOVA tables, Goodness of Fit, and much more.
Several types of regression will be available in future.

Scientific Forecasting Software (C modules)

Performs Univariate Box-Jenkins ARIMA modeling, forecasting, and various bootstrap simulation methods for the estimation of financial profit density functions according to the following strategies: Buy&Hold, Alexander's Filterrule, truncated Koyck lag-based MACD. Various types of time series analysis tools are available: (Partial) Auto Correlation Function, Spectral Analysis, Variance Reduction Matrix, Standard Deviation-Mean Plot, trimmed Skewness & Kurtosis, suspended rootogram displays, percentiles, concentration, histograms, foreward & backward running autocorrelation, ARMA parameter estimation, and much more.

Sample Size Software(sample size, sample accuracy, confidence interval)
Factor Analysis(Factor Analysis, Principal Components)
Clustering Software(Agglomerative Nesting, Hierarchical Clustering)
Reproducible ExamplesThis module provides access to interesting examples that have been published in articles or textbooks together with all the data and statistical software that is needed to reproduce them. All software is readily available online, and the source code of the underlying analysis can be viewed after successful completion.
Financial Calculators(currency decimal, currency fraction, present value, future value, Black-Scholes option prices, interest payment, principal payment, number of periods, effective interest, nominal interest, Quasi Random-Walk identification, trading performance statistics, etc...)

NEWS FEED from BBC News : Science and Nature
Sun's sizzling X-rays photographedNasa's "X-ray eye", designed to study distant galaxies and black holes, has turned its attention to our own star and snapped a remarkable portrait.
Scientists attack student exit planHome Secretary Theresa May's plan to expel foreign graduates draws criticism from the scientific community.
Big cat trade from Burma to China upA new study suggests that the trade in parts of tigers and other wild cats from Myanmar into China is growing.
LA River's flood role is 'paramount'Any moves to modify the concrete Los Angeles River, to return parts of it to a more natural setting or to capture water, must not compromise its flood-protection function, say scientists.
Antarctic science archive unlockedAerial photographs from the 1940s and 1950s are being used to probe the climate history of the Antarctic Peninsula.
Nasa emails spanner into spaceAstronauts on the International Space Station use a 3-D printer to make a wrench from instructions sent up in an email.
Stem cell scandal scientist resignsA Japanese stem cell scientist at the heart of a scandal over false claims and fabricated research has resigned.
Birds 'fled day before US tornadoes'Tracking data reveals that golden-winged warblers fled one day before the April 2014 US tornado outbreak, probably because they "heard it coming".
Carbon mission returns global mapsNasa's Orbiting Carbon Observatory produces its first global maps of carbon dioxide in Earth's atmosphere.
7ft marine reptile fossil beach findAn amateur fossil hunter has unearthed a 7ft skeleton of a carnivorous marine reptile on a beach in south Wales.
Badger cull fails to meet targetFewer than half the target number of badgers were killed in this year's cull in Gloucestershire, Defra announces.
Bats 'showing signs of recovery'Populations of most of Britain's bat species are stable or increasing following previous years of decline, report says.
Philae comet landing 'all a blur'An image has been released that shows the hairy moment that the Philae comet lander bounced back into space.
Festival lights viewed from spaceSatellites view how Christmas in the US and Ramadan in the Middle East brighten the globe.
'Vast store' of world's oldest waterThe world's oldest water, which is locked deep within the Earth's crust, is present at a far greater volume than was thought, scientists report.
New record for deepest fishFish are filmed more than 8,000m down in the Mariana Trench - the deepest place on Earth.
Shrink ship bubbles ‘for climate fix’Shrinking the bubbles generated by ships could counteract the impact of climate change, a study suggests.
Ministers unveil science strategyThe UK government has formally unveiled its strategy for science and innovation.
Yeti polar bear theory challengedA theory that the Himalayas' mythical yeti is a rare polar bear-brown bear hybrid animal is being challenged.
Methane 'belches' detected on MarsNasa's Curiosity rover has detected "belches" of methane gas on Mars - a gas that could hint at past or even present life on the planet.
California's water woes quantifiedScientists assess the scale of the epic California drought and say it will require more than 40 cubic km of water to return the US state to normal.
Sentinel tracks continued Napa slipThe creeping movement of the ground in California's Napa Valley, following its August earthquake, has been observed from space.
Squirrels are 'climate culprit'Arctic ground squirrels could play a greater role in climate change than was previously thought, research suggests.
Autism link to air pollution raisedA link between autism and air pollution during pregnancy has been suggested by scientists.
Life from 'deepest drill' revealedTiny microbes uncovered by the deepest-ever marine drilling expedition are analysed by scientists to see how they can survive under the seabed.
Threatened birds of prey 'vanish'Two of the rarest birds of prey in England, which had been satellite tagged, vanish in unexplained circumstances.
Hyenas feast at vulture restaurants"Restaurants" of dead meat set up for endangered vultures also attract an undesirable clientele of hyenas and jackals, according to a six-year study.
Brazil releases 'good' mosquitoesBrazilian researchers release thousands of mosquitoes infected with a bacteria that suppresses dengue fever into the environment in Rio de Janeiro.
VIDEO: Yellow River waterfall turns to iceExtremely cold temperatures have frozen parts of the Hukou waterfall on the Yellow River in north-west China.
VIDEO: Mexico welcomes migrating butterfliesMillions of monarch butterflies have arrived in Mexico's forests as part of their annual migration from Canada and the United States.
VIDEO: Can endangered white rhino be saved?Zoo keepers from around the world are due to meet next month to discuss ways to save the endangered northern white rhino.
VIDEO: Greenpeace to aid Nazca Lines inquiryGreenpeace will co-operate with an investigation by a Peruvian court to determine responsibility for damage caused by activists at the Nazca Lines, the group's chief executive says.
VIDEO: New record depth for deepest fishFish have been filmed more than 8km down in the Mariana Trench - the deepest place on Earth.
VIDEO: India launches largest rocketIndia has successfully launched its largest rocket and an unmanned capsule which could send astronauts into space.
VIDEO: New lights give hope to stargazersNew streetlights could reduce the orange glare of older sodium lights meaning clearer conditions for drivers and stargazers.
VIDEO: 'Ice pancakes' form on River DeeIce pancake formations, more commonly seen in the Antarctic, have been photographed on the River Dee in Aberdeenshire.
Science: Best long reads of 2014 (part one)A collection of some of the best reads from the BBC
The science news highlights of 2014Science and environment news highlights from 2014
The insects that made ChristmasMeet the insects that made Christmas
Paralysis cure, new vaginas...and other medical stories of 2014A year of incredible highs and devastating lows.
In pictures: Science news highlights of 2014Science highlights of the year in images
The mystery of Chopin's deathA mystery still unsolved by science
'Ringing' rock arches recordedAmerica's huge humming arches
In pictures: Bangladesh oil spill clean-upHow local residents cope with Bangladesh oil spill
The largest vessel the world has ever seenEnormous ship will collect and liquefy gas at sea

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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/

© All rights reserved. Academic license for non-commercial use only.
The free use of the scientific content, services, and applications in this website is granted for non commercial use only. In any case, the source (url) should always be clearly displayed. Under no circumstances are you allowed to reproduce, copy or redistribute the design, layout, or any content of this website (for commercial use) including any materials contained herein without the express written permission.

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.

Software Version : 1.1.23-r7
Algorithms & Software : Patrick Wessa, PhD
Server : www.wessa.net

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