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This site started life as place to keep personal notes which needed to be shared and is now a work in progress towards being an applied statistics textbook.  It is intended for people who work with data.  These include students, programmers and engineers and those of us who gaze out of the window wondering if events are random occurrences or part of a pattern.

My own personal interest is energy and environmental data and this is reflected in the choice of data from some of the example applications.

At the personal level, I have the modest ambition of taking the back-office part of my business off-grid.  In practice this means powering a desk light, mobile phone and a computer from a solar panel.  Since November 2007, I have been monitoring a small solar panel with  the intention of seeing how it behaves over the year, particularly during the winter.  In April 2008 the test rig was modified to allow the 4.7W panel to charge a 2.2 AH sealed lead acid battery during the day.  Overnight the battery is used to power a small fan.  The graph shows how the system is performing:

Follow the link to see where the numbers come from

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