R functions for regression analysis cheat sheet
29th May 2012
Posted in Bioinformatics, Links, Misc | No Comments »
Archive for May, 2012
Information criteria for choosing best predictive models
29th May 2012
Usually I’m using 10-fold (non-stratified) CV to measure the predictive power of the models: it gives consistent results, and is easy to perform (at least on smaller datasets).
Just came across the Akaike’s Information Criterion (AIC) and Schwarz Bayesian Information Criterion (BIC). Citing robjhyndman,
Asymptotically, minimizing the AIC is equivalent to minimizing the CV value. This is true for any model (Stone 1977), not just linear models. It is this property that makes the AIC so useful in model selection when the purpose is prediction.
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Because of the heavier penalty, the model chosen by BIC is either the same as that chosen by AIC, or one with fewer terms. Asymptotically, for linear models minimizing BIC is equivalent to leave–v–out cross-validation when v = n[1-1/(log(n)-1)] (Shao 1997).
Want to try AIC and maybe BIC on my models. Conveniently, both functions exist in R.
Posted in Bioinformatics, Machine learning | No Comments »
The genetics of orchids and dandelions
1st May 2012
Quite an interesting article on the genetics of behavior.
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