Category Archives: Uncategorized

Postgraduate data analysis and interpretation

I am revising my previous posts on the whole process, from getting started with R to using it to do linear modelling and linear mixed-effects modelling. Sunset over the coast, on the road from Ravenglass to Broughton What this revision … Continue reading

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Mixed-effects modeling — four hour workshop — part III: Regression modeling

We completed a study on the factors that influence visual word recognition performance in lexical decision. We then put together a dataset for analysis here. We examined the distribution of inter-relation of critical variables in that dataset, acting to transform … Continue reading

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Mixed-effects modeling — four hour workshop — part II: Data Exploration

We got our data together in Part I of this workshop, eventually arriving at the collation of a single dataframe in ‘long format’ holding all our data on subject attributes, item attributes and behavioural responses to words in a lexical … Continue reading

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Mixed-effects modeling — four hour workshop — part I: Data handling

This post will be one of four in which we go through how to model a multilevel dataset using linear mixed-effects modeling. To begin, we need to collate the data we have gathered in a simple reading experiment but one … Continue reading

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Mixed effects – Autumn workshop – practical steps in one hour

For an example analysis, we collated a .csv file of data from a repeated measures lexical decision experiment, which can be downloaded here. The code I have used in running the analysis described in this post can be found here. … Continue reading

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Why R? One hour R workshop

Watching someone else do or talk about computing is boring, as many rubbish and one good film of the past have proved. Still from WarGames (1983), source: imdb Better to do something practical and, here, the task is to evaluate … Continue reading

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Types of sums of squares

https://stat.ethz.ch/pipermail/r-help/2005-April/069923.html http://psych.colorado.edu/wiki/lib/exe/fetch.php?media=labs:learnr:typeiortypeiiiss.pdf http://cran.r-project.org/web/packages/fortunes/vignettes/fortunes.pdf http://imaging.mrc-cbu.cam.ac.uk/statswiki/FAQ/sstypes http://yihui.name/en/2010/04/rules-of-thumb-to-meet-r-gurus-in-the-help-list/ https://stat.ethz.ch/pipermail/r-help/2006-May/094765.html https://stat.ethz.ch/pipermail/r-help/2006-August/111927.html https://stat.ethz.ch/pipermail/r-help/2003-March/030705.html https://stat.ethz.ch/pipermail/r-help/2008-February/153740.html https://stat.ethz.ch/pipermail/r-devel/2000-May/020714.html https://stat.ethz.ch/pipermail/r-help/2001-October/015984.html http://www.stats.ox.ac.uk/pub/MASS3/Exegeses.pdf http://mcfromnz.wordpress.com/2011/03/02/anova-type-iiiiii-ss-explained/ http://stats.stackexchange.com/questions/23197/type-iii-sum-of-squares-from-sas-and-r http://stats.stackexchange.com/questions/6208/should-i-include-an-argument-to-request-type-iii-sums-of-squares-in-ezanova

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