Comments for BioStatMatt

Comment on Dehydrating lentil curry for backpacking by Nisha from Rainbow Plant Life

Nisha from Rainbow Plant Life — Thu, 29 Sep 2022 20:44:05 +0000

This is so cool!! Never in a million years did I think anyone would try dehydrating this recipe. I'm glad it turned out well and you enjoyed it on the trail!

Comment on Quick illustration of Metropolis and Metropolis-in-Gibbs Sampling in R by Quick illustration of Metropolis and Metropolis-in-Gibbs Sampling in R – Mubashir Qasim

Sun, 04 Jun 2017 15:18:17 +0000

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Comment on Quick illustration of Metropolis and Metropolis-in-Gibbs Sampling in R by Quick illustration of Metropolis and Metropolis-in-Gibbs Sampling in R | A bunch of data

Sun, 04 Jun 2017 12:36:03 +0000

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Comment on Round values while preserve their rounded sum in R by Tom

Tom — Tue, 02 Aug 2016 02:57:00 +0000

This is brilliant.

Comment on Round values while preserve their rounded sum in R by Charles

Charles — Fri, 29 Jul 2016 16:01:05 +0000

In reply to Carl Witthoft. "*Never* round in the middle of a calculation. You only round the final answer. " was what I was taught in high school, and I remember there were some classic examples of this, at least pre-internet, not sure what is on the inter webs nowadays. In my current line of work, higher level managers who aren't as number savvy don't want to see a table where "0.037 % of the patients Native Americans over the age of 55", they don't seem to want to see any percentage lower than a "0.1%," which means (you guessed it) there is going to be rounding error.

Comment on Round values while preserve their rounded sum in R by BioStatMatt

BioStatMatt — Fri, 29 Jul 2016 00:20:21 +0000

In reply to Max.

Looks like it works:
> sum(c(0.335,0.335,0.330)) [1] 1 > sum(round_preserve_sum(c(0.335,0.335,0.330))) [1] 1

Comment on Round values while preserve their rounded sum in R by Max

Max — Thu, 28 Jul 2016 21:06:48 +0000

What about: 0.335, 0.335, 0.33 - in this case rounded numbers result in 101% and a longer series of up-rounded numbers could be much more.

Comment on Round values while preserve their rounded sum in R by BioStatMatt

BioStatMatt — Thu, 28 Jul 2016 18:46:07 +0000

In reply to Carl Witthoft. "But may I ask: why did you round any variable prior to processing?" The rounding discussed here occurs at the presentation stage (after any other processing). I agree that the greatest practical precision (e.g., double floating point precision) should be used until then.

Comment on Round values while preserve their rounded sum in R by Carl Witthoft

Carl Witthoft — Thu, 28 Jul 2016 18:28:40 +0000

Most folks just include the standard disclaimer "does not sum to 100% due to rounding error" and move on :-) . But may I ask: why did you round any variable prior to processing? That was one of the first lessons we got in undergrad physics: always carry at least two extra digits' precision until the end of the calculation. Never round in the middle. I read thru the linked SO post and links therein, and it still looks to me like all of this is a kludge to "fix" poorly designed processing.

Comment on Round values while preserve their rounded sum in R by Round values while preserve their rounded sum in R – Mubashir Qasim

Round values while preserve their rounded sum in R – Mubashir Qasim — Thu, 28 Jul 2016 15:17:34 +0000

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