Version 1.3.5 adds some simplicity

October 14th, 2013

Colin Chapman, founder of Lotus Cars, had the following philosophy for automotive design: “Simplify, then add lightness”. Architect Ludwig Mies van der Rohe used to say “Less is More”. In a similar vein, the latest version of SOFA adds some simplicity for all those users who only use the default database (see Database?! But I just want to analyse my data!). Here is the list of feature changes introduced with version 1.3.5 of SOFA:

  • Simplified access to data for most users. SOFA now only displays a list of data tables (instead of showing both a list of databases and tables) unless there are multiple databases to choose from. For most users, the only database will be the default database SOFA uses to store imported or hand-entered data.
  • Slovenian support added (thanks to Nino Rode :-)).

And the following bugs have been fixed:

  • Fixed bug in histogram output when limited data spread. Error caused by miscalculation of significant decimal points required for display.
  • Fixed bug stopping late-added title details appearing when exporting output. The demo output is refreshed first so the source file is forced to be up-to-date. Probably needs a proper tidy-up some day but this works well in the mean time.
  • Fixed bug in exporting to desktop folder in fix_pdf – need to strip end off folder name when no AM/PM under localisation used.
  • Fixed various bugs associated with exporting output. When copying output, message about keeping form open now names form it means (to reduce confusion).
  • Fixed bug when using a project after it has just been deleted (by pressing cancel in select projects dialog after having deleted the currently active project).
  • Fixed bug which meant “Show Results” and “Add to report” options were displayed when setting up a project.
  • Fixed bug when cancelling a variable details selection in a project.

I hope you like the latest version.

Database?! But I just want to analyse my data!

August 22nd, 2013

SOFA aims for ease of use as part of its “ease of use, learn as your go, beautiful output” mantra. But it confronts users with having to think about databases, even if just working with simple spreadsheets of data or some data entered by hand.

This was the usability problem brought to my attention by a member of the community, Jan Dittrich. Jan (, is completing a Masters in Media Arts and Design at the Bauhaus University in Weimar/Germany. He mainly does user research and usability, but has an interest in statistics as well. When using SOFA he noticed that a “database” needs to be selected for most of the activities but that it might be a rather technical concept for some of those who use SOFA. He wrote me an email addressing the problem and we subsequently exchanged ideas.

So how to address this without removing one important ability of SOFA – namely the ability to connect directly to people’s data when it is in a database (e.g. MySQL).

We explored a few options …

Initial GUI ideas from Jan

… but ended up following the principle of “the least we could do” as recommended in the fantastic usability book “Rocket Surgery Made Easy” by Steve Krug.

Rocket Surgery Made Easy

As Krug notes, tweaking is usually better than redesigning because 1) it actually gets done; 2) larger changes are inevitably going to break some things (think months of squashing all the bugs out again); and 3) redesigns annoy a lot of existing users who have gotten used to the status quo (actually Krug has 9 reasons but these are my favourites).

Anyway, I had no enthusiasm for a major GUI overhaul but it did not make sense to leave a known usability problem in place. What Jan and I came up with was rather simple and elegant. SOFA only shows the Database label and drop-down if the user has configured SOFA to connect to any databases. Expect to see this change in the next version (1.3.5).

Database details only displayed when needed

Users who have database connections will notice no difference. But for everyone else the interface will be simpler and easier to use. Sometimes, less is more.

Where to for SOFA?

August 3rd, 2013

The SOFA Statistics project could go in a number of different directions. Ideally, it would:

  • Add more chart types and more flexibility for graphical customisation
    (without compromising the SOFA goals of beautiful output and ease-of-use)
  • Add a comprehensive array of the most important statistical tests
    (without compromising the ease-of-use and learn-as-you-go goals)
  • Make it much easier to automate reporting
  • Make publishing reports to the web, and office formats, seamless and simple.

I only have limited time to develop SOFA at the moment, so I have to choose the top priorities. Here is what I think I should do:

  • Charting
    • Make it easy to export data so it’s ready for charting using spreadsheet charting tools
    • Provide brief documentation on how to use advanced tools like Matplotlib
  • Statistical Tests
    • Make it really easy to export data from SOFA ready for analysis in R
  • Report automation
    • Provide documentation so people can automate SOFA themselves using Python
  • Publishing
    • Add a plug-in for exporting to a document format

I should also solve the remaining bugs preventing Mac users from being able to export output as images. What do people think about this direction? Drop me a line at

Lots of bug fixes (esp MS Access & SQL Server)

July 23rd, 2013

SOFA Statistics 1.3.4 is not an adventurous release but it squashes plenty of bugs – especially for MS Access and MS SQL Server users. Here are the features:

  • Can make more complex charts and larger series of charts. It is now possible to override the conservative limits on charts e.g. the maximum number of series or charts or clusters. A warning is shown that you may not necessarily produce a viable chart or set of charts. But often it will work so now you get to try and see.

High number of charts

Lots of images

  • Importing now copes with excessively long field names by shortening them automatically (without risking duplicates).
  • MS SQL Server views can now be analysed, not just tables.

And here are the bug fixes:

  • Fixed bug with calculation of mean with MS SQL Server data (now explicitly cast as float to avoid integer result).
  • Fixed bug in ANOVA output for precise (as opposed to speed) – it used to try mixing Decimals and other numeric types unsuccessfully.
  • Fixed bugs with chart data gathering queries so works in MS SQL Server properly. Also cleaner for the others in any case.
  • Fixed bug in underlying code if unique=False ever applied with scatterplots (currently never but it was still, technically, a bug).
  • Fixed bug in scatterplot SQL which affected MS Access and MS SQL Server (can’t use aliases in group by etc).
  • Adjusted y-title position in dojo scatterplots to avoid it being cropped.
  • Fixed bug when Postgresql date date being displayed as a category (couldn’t calculate a length of a datetime.datetime object).
  • Fixed layout bug when report table resized after Add to Report checkbox hidden. Now freshens layout when checkbox reappears.
  • Fixed bug preventing charts from being produced when linked to MS Access.
  • Fixed bug adding large delay to display of output when linked to MS Access.

There are some important changes coming for SOFA but it was important to tidy up a bit first. Watch this space!

Better Mac Testing of SOFA

May 5th, 2013

SOFA Statistics has a Mac version so I need to be able to test and package SOFA on a Mac. I do this on my Ubuntu Linux host machine using VirtualBox which works pretty well. But until a few minutes ago, the VirtualBox instance of Mac I had running was squeezed into a somewhat restrictive screen resolution. No longer! Here are the two basic steps I followed to resolve this problem:

1) Add a new screen resolution to as per How to Increase Mac OS X Snow Leopard Virtual Machine Screen Resolution on VirtualBox and VMware using Method #1 (but not from the /Extra folder – from the next bit):

Mac screen resolutions

2) Make screen resolution available from VirtualBox end as per Notes on setting 1680×1050 resolution on a Snow Leopard inside a VirtualBox

Resolutions from VirtualBox

And here is the result – a much more pleasant experience of testing SOFA on the Mac platform.

Better mac screen resolution for sofa
Next goal is to get some tricky graphics libraries I need working on the Mac.

Confidence Intervals for ANOVA & t-tests in 1.3.3

April 5th, 2013

95% confidence intervals have now been added to ANOVA and t-tests. And associated output has right justified numbers to make it easier to read.

Confidence Intervals

Version 1.3.3 also lets you sort by category labels in clustered bar charts, line charts, area charts and box plots. Area charts can also be sorted ascending or descending by count/mean/sum.

The series and category are now displayed in tooltips e.g. Italy, 20-29 for clustered bar charts, multi-series line charts, and box plots. This is especially helpful when there are lots of categories and/or series.

Boxplot Improvements

  • Improved statistics output footnotes.
  • Borders on bar-type charts are now optional. This can be useful when bars are very short.
  • Chi square clustered bar charts can cope with higher default limits for number of values.
  • Importing field names with more than 90 characters prohibited at the point of import rather than causing problems later.
  • The group by max number of values is now controlled by a single my_globals setting (making it easier to override).
  • The default settings for some remaining max values have been increased.

There was one minor bug-fix this version – line charts now cope better with lots of categories (increased padding around max label width in overall width calculations).

And a problem with the deb installer was also fixed.

1.3.2 Makes Backing Up SOFA Easy

January 27th, 2013

It is now easy to back up SOFA including data, reports, and any variable and project details. The backup button is on the main screen and can be made operational by installing the backup SOFA plug-in (available from


1.3.1 brings more improvements

January 9th, 2013

The latest version brings lots of small improvements and one useful new feature – the ability to use sum as an option for charting e.g. a line chart showing total sales by country:

New sum option

Here is the full list of improvements:

  • Adding sum as an option for charting e.g. a line chart showing total income per month by product. And the interface has been simplified at the same time.
  • Matplotlib scatterplots now have optimal min and max settings calculated for their x-axis.
  • Added footnote to Wilcoxon output explaining that different statistics packages may report the test statistic differently.
  • Misc fixes to chart layout including left margin offset.
  • Easier to add new variable definition files from within dialog for choosing them.
  • Modified recode column labels and help content to reduce confusion about which columns to enter range information into.

And bug fixes:

  • Fixed code picking optimal min and max axis values for scatterplots and box plots to cope when value range is much smaller than gap to 0.
  • CSV import now copes with new lines inside fields when gathering data for sample display.
  • Extra settings for Line Charts now display when they should even if only changing data type.
  • Fixed bug which allowed line breaks in field names.

Getting export images/pdfs working for Mac users

December 1st, 2012

SOFA has a plug-in for exporting reports and individual output as images (PNG) and/or PDFs. Unfortunately, I haven’t been able to make a version which works for OS X. The plug-in works on Windows and Linux but there are crucial libraries I haven’t yet been able to get working on Mac. Fortunately there are some signs of progress. Sid Stewart of PDF Labs is working on a new version of pdftk (one of the libraries I need working) and will be building a new installer for Mac. And wkhtmltopdf and pyPDF are already working. So getting the export output plug-in working for Mac might be possible after all.

You might be able to help. If you are a Mac user, and you are able to get either of the following libraries working on your machine, please drop me a line ( letting me know how you did it.

  • Ghostscript (used to convert PDF → PNG)
  • ImageMagick (used to trim PNG to correct dpi) or, even better still, PythonMagick

CUBRID donation helps SOFA project

November 20th, 2012


More good news for the SOFA Statistics project – CUBRID recently donated $300 to SOFA Statistics. CUBRID is “a comprehensive open source relational database management system highly optimized for Web Applications” and SOFA recently added a plug-in to connect to CUBRID databases.

It was also great to see the support that CUBRID gave to a range of other projects. One of the interesting things was the range of countries represented: New Zealand (SOFA Statistics), Switzerland, South Korea, Kenya, Russia, Australia, Denmark, Romania, China, Spain, Germany, Indonesia, the Netherlands, and the USA. Truly a global effort.

So on behalf of the SOFA project, thanks :-)