Johan Carlin's blog
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Understanding noise ceiling metrics: 'RSA' compared to Spearman-Brown

How do you calculate a noise ceiling? What is the difference between the estimates calculated in RSA and those reported in the encoding model literature?

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Power, prevalence, and the positive predictive value

In which we study how statistical power and significance thresholding influences reproducibility by relating it to positive and negative predictive values.

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Pilab tutorial 3: importing fMRI data and ROIs, searchlight mapping

We demonstrate how to apply pilab linear discriminant contrast methods to a real fMRI dataset, including searchlight mapping over the full volume.

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Pilab tutorial 2: linear discriminant contrast

We estimate multivariate discriminability with linear discriminant contrast (also known as cross-validated Mahalanobis distance, crossnobis).

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Pilab tutorial 1: model fit and cross-validation

We simulate a basic fMRI dataset, and estimate cross-validated prediction performance for a convolved design.

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About Johan Carlin
I work in human neuroimaging research at the University of Cambridge. I specialise in visual neuroscience, statistical methods, computational modelling, and data engineering. I'm a scientist, but I write a lot of code.

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