double bootstrapping

a procedure in which samples are randomly drawn, with replacement, from an initial data set and their parameters and standard errors estimated and averaged across the set of samples. This is then followed by another random sampling of the data, again with replacement, after which parameter estimates and standard errors are obtained a second time. Double bootstrapping usually is less biased than using a single set of bootstrapping samples.

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Psychology term of the day

January 3rd 2025

ring chromosome 18

a congenital chromosomal disorder characterized by microcephaly, ear and eye abnormalities, and mild to severe cognitive impairment. The condition is not hereditary but due to breakage of the arms of chromosome 18, which fuse to form one or more rings of varying sizes.