Posts Tagged ‘ R ’

a chain of collapses

June 19, 2018
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a chain of collapses

A quick riddler resolution during a committee meeting (!) of a short riddle: 36 houses stand in a row and collapse at times t=1,2,..,36. In addition, once a house collapses, the neighbours if still standing collapse at the next time unit. What are the shortest and longest lifespans of this row? Since a house with […]

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EasyER Version 1.2

June 10, 2018
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Version 1.2 of EasyER has now been released. The main change is the addition of a chart builder interface for interactively creating charts. The chart builder plugs into the popular ggplot2 package allowing ggplot2 charts in Excel. Some bugs have also ...

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maximal spacing around order statistics [#2]

June 7, 2018
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maximal spacing around order statistics [#2]

The proposed solution of the riddle from the Riddler discussed here a few weeks ago is rather approximative, in that the distribution of when the n-sample is made of iid Normal variates is (a) replaced with the distribution of one arbitrary minimum and (b) the distribution of the minimum is based on an assumption of […]

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rqdatatable: rquery Powered by data.table

June 3, 2018
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rqdatatable: rquery Powered by data.table

rquery is an R package for specifying data transforms using piped Codd-style operators. It has already shown great performance on PostgreSQL and Apache Spark. rqdatatable is a new package that supplies a screaming fast implementation of the rquery system in-memory using the data.table package. rquery is already one of the fastest and most teachable (due … Continue reading rqdatatable: rquery Powered by data.table

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WVPlots now at version 1.0.0 on CRAN!

May 26, 2018
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WVPlots now at version 1.0.0 on CRAN!

Nina Zumel and I have been working on packaging our favorite graphing techniques in a more reusable way that emphasizes the analysis task at hand over the steps needed to produce a good visualization. We are excited to announce the WVPlots is now at version 1.0.0 on CRAN! The idea is: we sacrifice some of … Continue reading WVPlots now at version 1.0.0 on CRAN!

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Le Monde puzzle [#1051]

May 17, 2018
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Le Monde puzzle [#1051]

A combinatoric Le Monde mathematical puzzle of limited size: When the only allowed move is to switch two balls from adjacent boxes, what is the minimal number of moves to return all balls in the above picture to their respective boxes? Same question with six boxes and 12 balls. The question is rather interesting to […]

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maximal spacing around order statistics

May 16, 2018
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maximal spacing around order statistics

The riddle from the Riddler for the coming weeks is extremely simple to express in mathematical terms, as it summarises into characterising the distribution of when the n-sample is made of iid Normal variates. I however had a hard time finding a result connected with this quantity since most available characterisations are for either Uniform […]

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maximal spacing around order statistics

May 16, 2018
By
maximal spacing around order statistics

The riddle from the Riddler for the coming weeks is extremely simple to express in mathematical terms, as it summarises into characterising the distribution of when the n-sample is made of iid Normal variates. I however had a hard time finding a result connected with this quantity since most available characterisations are for either Uniform […]

Read more »

maximal spacing around order statistics

May 16, 2018
By
maximal spacing around order statistics

The riddle from the Riddler for the coming weeks is extremely simple to express in mathematical terms, as it summarises into characterising the distribution of when the n-sample is made of iid Normal variates. I however had a hard time finding a result connected with this quantity since most available characterisations are for either Uniform […]

Read more »

maximal spacing around order statistics

May 16, 2018
By
maximal spacing around order statistics

The riddle from the Riddler for the coming weeks is extremely simple to express in mathematical terms, as it summarises into characterising the distribution of when the n-sample is made of iid Normal variates. I however had a hard time finding a result connected with this quantity since most available characterisations are for either Uniform […]

Read more »


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