SOFA Statistics help

help:anova

Anonymous (anonymous@undisclosed.example.com) — 2011-07-30T06:47:49-0400

Contents Statistical Tests Available ANOVA (Analysis of Variance) The one-way ANOVA (see One-way ANOVA) looks at averages for different groups and works out how likely the differences between groups are given the differences (variability) within groups. So if we were looking at average height of British, Canadian, Australian, and New Zealand adults, we would be more confident we had a real difference the bigger the height difference between nations and the narrower the height spread within…

help:backups

Anonymous (anonymous@undisclosed.example.com) — 2014-11-21T20:18:06-0400

Contents Backups Backing up * Click on the Run Backup button * Copy the zip file onto a USB stick - perhaps to take offsite, or to transfer to another computer. Restoring on another machine Presumably the new computer doesn't have any existing SOFA analyses or reports you would be worried about wiping over - just an empty SOFA installation.

help:charts

Anonymous (anonymous@undisclosed.example.com) — 2012-02-23T14:12:07-0400

Contents Wiki Making Charts Overview SOFA Statistics support making a range of different charts: * simple bar charts * clustered bar charts * pie charts * line charts * area charts * histograms * scatter plots * box plots To make a chart, select the chart type, make any settings specific to that type of chart, and click on the

help:chisquare

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T18:16:51-0400

Contents Statistical Tests Available The Chi Square Test :!: if you have summary results already tallied, you can enter these directly into the On-line Chi-Square Calculator. SOFA runs off raw data only and creates all the group totals for you. We use the Chi Square Test Pearson's chi-square test when investigating if there is a relationship between two categorical variables[1] e.g. gender and age group.

help:data_entry

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T17:52:16-0400

Contents Entering Fresh Data SOFA Statistics lets you enter your data directly. Or you can import it from a spreadsheet or csv file. Or you can connect directly to a database. This demonstration shows how to enter fresh data. Start by clicking on the “

help:data_structure

Anonymous (anonymous@undisclosed.example.com) — 2015-03-29T01:54:09-0400

Contents Getting your data structure right for SOFA Data Format Most often, you enter some data into SOFA and everything Just Works. You don't have to think about your data structure particularly. But sometimes you want to analyse one variable by another e.g. height by gender and SOFA doesn't seem to allow you to. Or you want to see if there is a difference between, for example, different years, and there is no way of doing it. Or perhaps you want to do a paired t-test and you can't get the c…

help:export_scripts

Anonymous (anonymous@undisclosed.example.com) — 2010-08-26T17:02:48-0400

Contents Export Scripts A script is a file you can use to make report tables or other SOFA Statistics output. Scripts can be run using the free and open source Python programming language. These tables will be saved to the output report location selected at the point when the script is exported.

help:exporting_data

Anonymous (anonymous@undisclosed.example.com) — 2014-11-21T20:12:14-0400

Contents Exporting Data The built-in Export Data functionality lets you export raw data directly. But there is a manual alternative if you prefer: * Download and install the excellent free and open source SQLite Database Browser application () * Use SQLite Database Browser to open the internal SOFA database (e.g. /home/username/sofastats/_internal/sofa_db or C:\Documents and settings\username\sofastats\_internal\sofa_db)

help:filtering_data

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T18:23:49-0400

Contents Filtering Data Sometimes you want to conduct analyses on a subset of your data e.g. on males only. In SOFA you can apply temporary filters to your data. Remember: Filters will remain in place until you close SOFA or deliberately remove them.

help:getting_started

Anonymous (anonymous@undisclosed.example.com) — 2026-02-11T05:10:15-0400

Contents 640:248=2.58×96=247,74×100=24774:640=38,70%------- 2.58×48=123 Demonstration Data Before analysing your own data, it can be helpful to play with the demonstration data provided with SOFA Statistics. Click the “Enter/Edit Data” button to get started.

help:importing

Anonymous (anonymous@undisclosed.example.com) — 2015-10-31T03:21:50-0400

Contents Importing Spreadsheet/CSV Data Prepare Your Data Clean the Spreadsheet/CSV file * One data type per column. If you want a column analysed as a number e.g. 60, 102.5, 3, etc remove text such as “n/a”, “removed” etc. SOFA can cope with mixed data types by getting you to choose an overall type as you import (unless you select text, data of the other types is converted to missing values). But you will have to decide what to do for each and every column every time you import the data. …

help:indep_ttest

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T18:19:40-0400

Contents Statistical Tests Available Independent t-test The independent t-test is of the most well-known statistical tests (see Student's t-test). It is useful for looking at differences in the average between two groups when the variable being averaged is numerical and inadequately normal - for example, looking at the difference in height between countries. If you are looking at paired data e.g. pre and post-diet weight, you need to use the

help:kruskal

Anonymous (anonymous@undisclosed.example.com) — 2010-12-20T02:37:09-0400

Contents Statistical Tests Available Kruskal-Wallis H Kruskal-Wallis H lets you decide if there is a difference in an ordinal variable e.g. user satisfaction ratings, between groups. It is the non-parametric equivalent of the ANOVA (Analysis of Variance) relying on value ranks rather than data values themselves. Because it is based on order rather than value, the output table displayed by SOFA shows the median instead of the mean.

help:linux_installation

Anonymous (anonymous@undisclosed.example.com) — 2024-02-27T10:45:21-0400

Contents Non-Ubuntu/Debian Linux Installation Introduction Deb packages are supplied for download on the main SOFA website. To cater to other flavours of Linux, a tar.gz is also provided. Inside, you will find README.txt and INSTALL.sh. * Step 1 is to use your distro package manager to install all the required support packages e.g. matplotlib (for chart plotting). Details of required packages are in the next subsection.

help:mann_whitney

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T18:17:15-0400

Contents Statistical Tests Available Mann Whitney U The Mann-Whitney U is of the most well-known non-parametric significance tests (see Mann-Whitney U). It is useful for looking at differences in the average between two groups when the variable being averaged is either ordinal only or inadequately normal - for example, looking at the difference in satisfaction ratings between two restaurants. It is also quite robust with respect to outliers.

help:online_surveys

Anonymous (anonymous@undisclosed.example.com) — 2010-12-02T14:07:14-0400

Contents Online Surveys with SOFA and Google Docs Spreadsheets Overview SOFA makes it easy to survey people and analyse the results. Just make a simple survey form in Google Docs, send a link to the people you want to survey (perhaps individually, perhaps in a newsletter), and import the data into SOFA Statistics from the underlying Google Docs Spreadsheet ready to make tables etc. You can even embed the survey in a web page.

help:overview

Anonymous (anonymous@undisclosed.example.com) — 2020-10-22T02:31:45-0400

Contents Using Statistical Analysis System Statistical Analysis System can be used to: * make charts e.g. Pie Charts * produce attractive report tables on your data e.g. gender vs age * run basic statistical tests e.g. one-way ANOVAs * and generally increase your understanding of your data.

help:paired_ttest

Anonymous (anonymous@undisclosed.example.com) — 2012-08-12T18:17:53-0400

Contents Statistical Tests Available Paired t-test The paired t-test (see Student's t-test) is useful for looking at differences in two variables. The data must be paired e.g. looking at pre and post-diet weight. The variables being averaged must also be numerical and adequately normal. If you are looking at independent/unpaired data e.g. height between two countries, you need to use the

help:pearsonsr

Anonymous (anonymous@undisclosed.example.com) — 2011-02-17T16:06:08-0400

Contents Statistical Tests Available Correlation - Pearson's R Test The Pearson's R Correlation Test (also called the Pearson product-moment correlation coefficient) tells you how strong the linear correlation is for paired numeric data e.g. height and weight. You should never run this test without viewing a scatterplot and visually examining the basic shape of the relationship. The test could indicate a low linear correlation and yet the data could have a very strong and clear non-linear p…

help:projects

Anonymous (anonymous@undisclosed.example.com) — 2011-01-10T20:47:17-0400

Contents Connecting to Databases Unlike many statistics programs, in SOFA Statistics you can connect directly to data you have in any supported SQL-type database (currently MS Access, MySQL, MS SQL Server, PostgreSQL, and SQLite). NB if you have data in a spreadsheet or stored as csv see

help:recoding_data

Anonymous (anonymous@undisclosed.example.com) — 2011-04-07T17:04:57-0400

Contents Recoding Data Introduction Sometimes you need to change your data before you can analyse it. For example, you might have a field called age but you want to look at the percentages in different age groups. You might want 0-19 in one group, 20-29 in another, 30-39 in another, 40-64 in another, and finally 65+ in another.

help:report_tables

Anonymous (anonymous@undisclosed.example.com) — 2022-04-17T16:46:47-0400

Contents Making Report Tables Making a Simple Crosstab Table On the main SOFA form, click on “Report Tables”, Let's start with a simple report table of Age Group vs Country. NB all of this data is fictitious and designed to allow features of the program to be demonstrated.

help:spearmansr

Anonymous (anonymous@undisclosed.example.com) — 2012-04-21T17:47:54-0400

Contents Statistical Tests Available Correlation - Spearman's R Test The Spearman's R Correlation Test (also called the Spearman's rank correlation coefficient) is generally used to look at the (roughly) linear relationship between two ordinal variables e.g. satisfaction ratings for staff and level of staff training. You should never run this test without viewing a scatterplot and visually examining the basic shape of the relationship. The test could indicate a low linear correlation and ye…

help:stats_tests

Anonymous (anonymous@undisclosed.example.com) — 2011-01-11T22:55:11-0400

Contents Wiki Statistical Tests Available in SOFA Statistics A video is available showing how SOFA Statistics can help you select and interpret the appropriate statistical test: Statistical test selection video * ANOVA (Analysis of Variance) * Chi Square Test * Correlation - Pearson's R * Correlation - Spearman's R * Kruskal-Wallis H * Mann-Whitney U * Independent t-test * Paired t-test * Wilcoxon Signed Ran…

help:variable_details

Anonymous (anonymous@undisclosed.example.com) — 2017-04-05T04:15:21-0400

Contents Setting variable details e.g. labels Anywhere you can see a variable, you should be able to right click on it and access its settings. E.g. from a variable added to a report table configuration: Or a variable in a drop down list in a charts dialog:

help:wilcoxon

Anonymous (anonymous@undisclosed.example.com) — 2010-12-20T23:36:12-0400

Contents Statistical Tests Available Wilcoxon Signed Ranks The Wilcoxon Signed Ranks Test (see Wilcoxon signed-rank test) is useful for looking at differences in two variables. The data must be paired e.g. looking at pre and post-diet weight. The variables being averaged must also be measured at an interval level of measurement.

help:will_not_start

Anonymous (anonymous@undisclosed.example.com) — 2019-07-26T02:25:13-0400

Contents SOFA Won't Start Sorry! But we can probably fix it. Make sure you are installing the latest version of SOFA Statistics Sourceforge SOFA downloads. Newer versions are sometimes better at handling problems. Here are some things which might help: Using Sofastats Recovery