blind monty hall
As I was waiting for my boat on a French Guiana beach last week, I thought back about a recent riddle from The Riddler where an item does a random...continue reading.
Author: xi'an
triple ruin
An almost straightforward riddle from The Riddler involving a triple gambler’s ruin: Dawn competes against three players Alessandra, Berenike, and Chinue, with probabilities of winning one round ¾, ½, and...continue reading.
dice and sticks
A quick weekend riddle from the Riddler about the probability of getting a sequence of increasing numbers from dice with an increasing number of faces, eg 4-, 6-, and 8-face...continue reading.
worst colour scale?
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.
Xing glass bridges [or not]
A riddle from the Riddler surfing on Squid Games. Evaluating the number of survivors (out of 16 players) able to X the glass bridge, when said bridge is made of...continue reading.
Xing glass bridges [or not]
A riddle from the Riddler surfing on Squid Games. Evaluating the number of survivors (out of 16 players) able to X the glass bridge, when said bridge is made of...continue reading.
moralizing gods drive Nature rejection
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.
multinomial but unique
A quick riddle from the Riddler, where the multinomial M(n¹,n²,100-n¹-n²) probability of getting three different labels out of three possible ones out of three draws is 20%, inducing a single...continue reading.
almost reversed 2-lag Markov chain
Another simple riddle from the Riddler: take a binary sequence and associate to this sequence a score vector made of the numbers of consecutive ones from each position. If the...continue reading.
breaking sticks of various length
A riddle from the Riddler with a variation on the theme of breaking sticks: Given a stick of length L, what is the optimal manner to break said stick to...continue reading.
inf R ! [book review]
Thanks to my answering a (basic) question on X validated involving an R code, R mistakes and some misunderstanding about Bayesian hierarchical modelling, I got pointed out to Patrick Burns’...continue reading.
on approximations of Φ and Φ⁻¹
As I was working on a research project with graduate students, I became interested in fast and not necessarily very accurate approximations to the normal cdf Φ and its inverse....continue reading.
scale matters [maths as well]
A question from X validated on why an independent Metropolis sampler of a three component Normal mixture based on a single Normal proposal was failing to recover the said mixture…...continue reading.
bean bag win
A quick riddle from The Riddler, where a multiple step game sees a probability of a 3 point increase of .4 and a probability of a 1 point increase of...continue reading.
unbalanced sampling
A question from X validated on sampling from an unknown density f when given both a sample from the density f restricted to a (known) interval A , f¹ say,...continue reading.
one-way random walks
A rather puzzling riddle from The Riddler on an 3×3 directed grid and the probability to get from the North-West to the South-East nodes following the arrows. Puzzling because while...continue reading.
how many T-Rex can you fit in your backyard?
A fascinating question examined in this issue of Science [as pointed out by Nature!] in a paper by Marshall et al. on how many T. Rex(es) roamed the Earth at...continue reading.
a common confusion between sample and population moments
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.
ten computer codes that transformed science
In a “Feature” article of 21 January 2021, Nature goes over a poll on “software tools that have had a big impact on the world of science”. Among those, the...continue reading.
the new DIYABC-RF
My friends and co-authors from Montpellier have released last month the third version of the DIYABC software, DIYABC-RF, which includes and promotes the use of random forests for parameter inference...continue reading.
