Chunk Averaging of GLM
This article is originally published at https://statcompute.wordpress.com
Chunk Average (CA) is an interesting concept proposed by Matloff in the chapter 13 of his book “Parallel Computing for Data Science”. The basic idea is to partition the entire model estimation sample into chunks and then to estimate a glm for each chunk. Under the i.i.d assumption, the CA estimator with the chunked data is asymptotically equivalent to the estimator with the full data. The possibility of converting the full model estimation with an excessively large dataset to the chunked estimation with small pieces is particularly attractive in real-world model developments where the model convergence could be challenging given the data size.
The ca_glm() function below is my attempt to implement the Chunk Averaging of GLM. As shown, CA estimations by various chunks are consistent with the estimation with the full data.
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