modern_R
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tapply same-length error message
https://github.com/b-rodrigues/modern_R/blob/d1d3ed1e852c246198338f0fa899a8220913e99d/04-descriptives.Rmd#L105
A delight of R is this propensity for inscrutable-to-newbies error messages. A gentle suggestion as to which arguments' lengths are causing the trouble here seems in order.