## BrightStat: Your free online statistics calculator

• BrightStat offers explanations and examples of non-parametric and parametric tests
• BrightStat offers an online statistics calculator for doing your own statistical analysis and data visualisation, inclunding many non-parametric and parametric tests and fully customizable graphs (bar plot, column plot, line plot, area plot, boxplot, scatterplot, pie plot, histogram, etc.)
• BrightStat offers the Visualizer for easy calculation of critical values and p-values for most important probability distributions in statistics as the standard normal distribution, Chi-squared distribution, Student's t distribution and Fisher's F distribution

## What's new

Since 15. of July BrightStat is completely for free again. Every account has a maximum of 20 file slots on the server and has access to all features of BrightStat.com

Academic licences for teachers and students have been canceled.

Brown Forsythe Test for homogeneity of variances has been added

The test is available in 'Compare Variances', the 'MANOVA', 'ANOVA' and 'one-way ANOVA' procedures

more details

## BrightStat tips

#### Problem with Firefox on Windows

Occasionally variables can not be selected in variable lists in BrightStat's web application. In such a case try another web-browser. Generally I recommend Chrome, Edge or Safari for BrightStat.com web application.

#### 2016-05-12

You can upload your data in Microsoft Excel format. If this does not work, you can always export your data as a tab-delimited text file from within Microsoft Excel and upload the text file. This should work properly. Read more about how to prepare your data for BrightStat

#### Presicion

By default brightstat rounds the results to five and p-values to three decimal places. If you need more presicion, just click on the the result cell in the output table.

#### Automatic recode

BrightStat lets you recode categorical variables, often coded as strings, into ascending numbers automatically. Just select 'Automatic Recode' in the 'Data Menu' and indicate the variables to be recoded. The old values will be stored as value labels for the new numeric variable.

#### BrightStat sample files

In the 'Data Menu' there is 'Load Sample Datafile' in the first column 'Data File'. There you'll find a list of sample files (including files for all examples on BrightStat's website). So you can start discovering BrightStat right away.

#### BrightStat calculator

BrightStat has a built in calculator which allows you to compute new variables with existing ones. If you have measured the weight (in kg) and height (in meters) of n subjects you can easily compute the body mass index (BMI) for all subjects. If your variables are named 'weight' and 'height' the formula would be: _weight/_height^2.
The sample file 'BodyFat' contains the variables 'Weight' (pounds) and 'Height' (inches), so the formula for calculating the BMI needs some adjustment in that case: (_Weight*0.45359237)/(_Height*2.54/100)^2.
Note: In the formula a variable name is always preceded by an underscore '_'.

#### 2015-09-03

BrightStat is not intended to be a data editor. Small changes can be done without problems but be aware that editing your data in Brighstat's data window may be very time consuming, especially with larger data files.
It is strongly recommended to prepare your data for BrightStat before uploading it into the database. A period '.' will be treated as a missing value.
How to prepare your data for BrightStat

#### Set data filter

You can define a filter variable for your data. Analysis and graphs are then performed for selected cases only. Select 'Filter Data' from the menu and indicate which values of which variables should be included in the analysis.

#### 2015-08-04

You can split your datafile using a categorical variable. All tests and/or graphs are then performed for the individual categories of the split variable. Select 'Split Data' from the menu and indicate one or more split variables.

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## Citation

Stricker, D. (2008). BrightStat.com: Free statistics online. Computer Methods and Programs in Biomedicine, 92, 135-143.

abstract

## Version history

2017-05-05 v1.3.1

• Video tutorials are now embeded in the web application
• A bug has been fixed. Graphs for MANOVA and repeated ANOVA are now labeled correctly even when split file is active.

2017-03-20 v1.2.20

• Table headers fixed in some result tables

2017-03-08 v1.2.19

• Minor bugfixes

2017-03-03 v1.2.18

• Function selection fixed in graph dialogue
• I have adapted the dialogue box for column, line and area graphs with more than one variable. You can now select the desired function for the variables before adding them to the list.

2017-02-18 v1.2.17

• I have added the Brown Forsythe test for homogeneity of variances in the following statistical procedures: MANOVA, ANOVA, Repeated ANOVA, one-way ANOVA and comparison of variances

2017-01-18 v1.2.16

• Bug fix for BrightStat Calculator
• I have fixed an error which occurred when calculating a new variable with a datafile containing more variables than cases.

2016-12-06 v1.2.15

• Bug fix for Mann Whitney U-Test
• I have fixed an error which did not address large differences in sample sizes in the Mann Whitney U-Test correctly. Exact values are now reported only if both samples are less than 9 observations.

2016-10-28 v1.2.14

• Minor bug fix for box-plot chart
• I have fixed an error in the dialogue of single boxplot graphs with separate variables. The buttons to add and remove variables to and from the list of selected variables work correctly now.

2016-09-08 v1.2.13

• Minor bug fixes for chart editor
• I have fixed some errors that occurred when positions of category elements on x axis or within pie charts were changed.

2016-08-25 v1.2.12

• Pie graphs are now available
• Graphs may now be exported to pdf and svg files. For doing this, BrightStat.com uses the exporting service of Highcharts. Please be aware of their terms of use
• Minor bugs fixed, especially in the chart editor

more details

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