Statistics on-line calculators

  

Here are some on-line calculators you can use directly from your desk (without using MINITAB!)

 

You have to enter the data directly yourself – and paste the results into your own document, where you can reformat it or edit it to your heart’s content!

 

Analysis

Comment (and URL)

WebStat

All-purpose calculator, using Java Applets. Similar (but not identical) to MINITAB

Good for contingency tables, t-tests (but does not contain non-parametric tests)

http://dostat.stat.sc.edu/webstat/3.0/oldindex.html

 

Use with the file internet.txt as sample data (third item in this table)

StatCrunch

The updated, and commercial version of WebStat (above) It is simple to use and with extensive help facilities.  Highly Recommended!

 

This version contains non-parametrics and superior storage and output facilities. 

Well worth the very modest price ($5 for 6 months, $8 for a year) http://www.statcrunch.com

 

Use with the file internet.txt  or internet2.txt as sample data
(third item in this table)

 

internet.txt


internet2.txt


(Sample
data)

The sample data file (internet.txt) can be downloaded here.  Save it on your own computer as a text (.txt) file under the name internet.txt 

http://mh-web.co.uk/statstore/internet.txt

 

See also http://mh-web.co.uk/statstore/internet2.txt

for the same file as above but with summary data included in it

 

General

Excellent all purpose  (but only 2x2 chi-square)

 http://www.graphpad.com/quickcalcs/

 

HyperStat

Good for descriptive statistics of a continuous variable (and especially for detecting skewness and kurtosis of a distribution).  Paste the results in!

http://www.ruf.rice.edu/~lane/stat_analysis/descriptive.html

Chi-Square

Allows you to label- but does not give you an exact p

http://www.georgetown.edu/faculty/ballc/webtools/web_chi.html

 

Chi-square

Gives you a more exact ‘p’ – enter d.f. and Chi-square (c2)

http://www.anu.edu.au/nceph/surfstat/surfstat-home/tables/chi.php

 

t-test

Useful for continuous data – enter it manually for each group

http://www.graphpad.com/quickcalcs/ttest1.cfm

 

t-tests

Several t-test options available, including one tailed tests on a single sample

http://www.changbioscience.com/stat

Wilcoxon

(Mann-Whitney)

The Wilcoxon and Mann-Whitney tests are, in practice, exactly equivalent tests.

For use when the normality of the distribution is not known (i.e. very often)

http://www.fon.hum.uva.nl/Service/Statistics/Wilcoxon_Test.html 

 

Examples of ‘results’ files

Here are two examples of ‘results’ files

(a) using EXCEL graphs and add-ins plus WebStat and other software mentioned
    above
    http://mh-web.co.uk/statstore/internet.doc

(b) Using only WebStat

    http://mh-web.co.uk/statstore/internet2.doc

 

 

WebStat Help pages

You can access a .doc file containing all of the WebStats help pages here:

http://mh-web.co.uk/statstore/webs_help.doc

 

 

 

 

 

Mike Hart

March, 2007