In Pictures: Data visualisation on a shoestring

Are you seeking tools for data visualisation and analysis that won't bust your budget? Here are dozens of ideas.

Data cleaning with OpenRefine Before you start analyzing data or putting it in visual form, you sometimes need to clean it. There could be data entry mistakes, such as numbers with missing or extra zeroes, or salary information where hourly and annual rates are mixed.

Or there could be multiple versions of the same item, making it tough to properly group data -- for example, many ways of entering the same company name, as Computerworld encountered when reporting on the top users of H-1B visas.

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