merely fiddlin
For any positive, base-10 integer N, define f(N) as the number of times you have to add up its digits until you get a one-digit number. Find the smallest whole...continue reading.
Author: xi'an
making the next meeting more productive
One of the students’ requests I almost invariably reject is code debugging (and they are warned about it from the start). Here is an illustration why, with an R code...continue reading.
statistical modeling with R [book review]
Statistical Modeling with R (A dual frequentist and Bayesian approach for life scientists) is a recent book written by Pablo Inchausti, from Uruguay. In a highly personal and congenial style...continue reading.
Galton and Watson voluntarily skipping some generations
A riddle on a form of a Galton-Watson process, starting from a single unit, where no one dies but rather, at each of 100 generations, Dog either opts for a...continue reading.
Model-Based Clustering, Classification, and Density Estimation Using mclust in R [not a book review]
This article is originally published at https://xianblog.wordpress.com Thanks for visiting r-craft.org This article is originally published at https://xianblog.wordpress.com Please visit source website for post related comments.continue reading.
operation precisely impossible
Since the solution to the previous riddle from The Riddler on the maximum of different terms in the composed operation a∅b∅c∅d∅e∅f depending on the bracketing ordering and the meaning of...continue reading.
operation impossible
A riddle from The Riddler on how many different numbers one could at most produce from six initial values and the four basic operations. In other words, how many values...continue reading.
simulated annealing and logistic regression to the max
A Riddler puzzle on the three binary and sequential questions one should ask three players hiding their respective U(0,1) realisation, U, V, and W, to best guess which player holds...continue reading.
StanCon 2023 [20-23 July 2023]
This article is originally published at https://xianblog.wordpress.com Thanks for visiting r-craft.org This article is originally published at https://xianblog.wordpress.com Please visit source website for post related comments.continue reading.
partial rankings and aggregate ranks
When interviewing impressive applicants from a stunning variety of places and background for fellows in our Data Science for Social Good program (in Warwick and Kaiserslautern) this summer, we came...continue reading.
JAGS Workshop [10-14 July 2023]
Hey, JAGS users and would-be users, be warned that registration is now open for the annual JAGS workshop on probabilistic modelling for cognitive science. The tenth instalment of this workshop...continue reading.
alone in Napoli
A combinatorics puzzle from The Riddler about a Napoli solitaire where 4 x 10 cards numbered from 1 to 10 are shuffled and the game is lost when a number...continue reading.
The Effect [book review]
While it sounds like the title of a science-fiction catastrophe novel or of a (of course) convoluted nouveau roman, this book by Nick Huntington-Klein is a massive initiation to econometrics...continue reading.
go forth and X [or the reverse]
The New Year Riddle is about optimisation: starting with a single machine, between delivering one unit per machine – hour and delivering one new machine per machine every six days,...continue reading.
latest math stats exam
As I finished grading our undergrad math stats exam (in Paris Dauphine) over the weekend, which was very straightforward this year, the more because most questions had already been asked...continue reading.
Those who live by ChatGPT are destined to get advice of unpredictable quality
This article is originally published at https://xianblog.wordpress.com Thanks for visiting r-craft.org This article is originally published at https://xianblog.wordpress.com Please visit source website for post related comments.continue reading.
Tribonacci sequence
A simplistic puzzle from The Riddler when applying brute force: A Tribonacci sequence is based on three entry integers a ≤ b ≤ c, and subsequent terms are the sum...continue reading.
foliage to the max
An easy riddle from The Riddler that did not even require coding! Given that a tree changes colours at a random time A distributed according to a Uniform distribution (over...continue reading.
Bayes Factors for Forensic Decision Analyses with R [book review]
My friend EJ Wagenmaker pointed me towards an entire book on the BF by Bozza (from Ca’Foscari, Venezia), Taroni and Biederman. It is providing a sort of blueprint for using...continue reading.
optimal leap year
A riddle about leap years: a solar year consists of approximately 365.24217 mean solar days, which is why there is a leap year approximately every four years. Approximately because the...continue reading.
