[Video] Introduction to GREL

In partnership with the OKFN School of Data , we recorded last November an hour Skillshare on Refine GREL Language.  Always wonder how to get started with the Generic Refine Expression Language (GREL)?

Watch this one hour tutorial and learn the basic of the language along with simple expression. Further tutorial will be published to go through each functions presented in this video.

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Data Journalism Workshop - New York (from around the web)

Google Hangout of HHNew York presenting Google Refine

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Data exploration tutorial with google refine

Recently, Hugh Stimson published a great article: Data Mining My Old Radio Playlists. His post mix tutorials on php scripting, data cleaning with google refine and data analysis with PostgreSQL.

This answer post demonstrate that data analysis is fully doable in google refine using really basic function (I'll be using GREL function only once for the long tail analysis). I guess also this post is a good illustration of my previous post on data exploration using google refine.

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Difference between a record and a row

Google refine make a clear distinction between a row and a record. We will see what's the difference between the two and advantages to works in records mode.

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facet by facet count

Google refine offers the possibilities to facet by name or choice count. This can be useful to focus an analysis or transformation only on value having more than twenty records for example.

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Sort facet by name using toTitlecase(value) expression

When using the text facet option, google refine, sort all available value either by choice count or by name. When sorting by name, all values will be sorted by number first and then by alphabetical order (capital first and then lower case) into something like this:

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Use google refine to navigate data solely (facet, filter, flag)

Google refine can also be used to solely navigate and explore data without editing them. I find it very useful to explore large data-set thanks to its good user interface, this avoid to develop a specific one to visualize data. In this post I will present the three mains option to interact with the data: facet, text filer and flags.

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Google Refine 2.0 Training video

In this video you will learn to:

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Full Tutorial by David Huynh

Download a 17 pages tutorial on google refine
by David Huynh

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Google refine presentation (video)

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