560 search results for "ants problem"

Transaction Costs are Not an Afterthought; Transaction Costs in quantstrat

April 10, 2017
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Transaction Costs are Not an Afterthought; Transaction Costs in quantstrat

In this article we see why modelling transaction costs matters and how to do so using quantstrat.

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Creating figures like the paper ‘Completeness of Digital Accessible Knowledge of Plants of Ghana’ Part 4

December 13, 2016
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Creating figures like the paper ‘Completeness of Digital Accessible Knowledge of Plants of Ghana’ Part 4

This is the fourth part of the of the post where are going to create figure 4 Plot of Inventory Completeness against sample size for grid cells. Part 3 of this series we created chronohorogram for understanding seasonality by year of the data records. If you have not already done so, please follow steps in Part 1 of the post

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Why Within-Subject Designs Require Fewer Participants than Between-Subject Designs

November 12, 2016
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Why Within-Subject Designs Require Fewer Participants than Between-Subject Designs

(This article was first published on The 20% Statistician, and kindly contributed to R-bloggers) One widely recommended approach to increase power is using a within subject design. Indeed, you need fewer participants to detect a mean difference between two conditions in a within-subjects design (in a dependent t-test) than in a between-subjects design (in an independent t-test). The reason...

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The Problem With Depmix For Online Regime Prediction

October 5, 2016
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The Problem With Depmix For Online Regime Prediction

This post will be about attempting to use the Depmix package for online state prediction. While the depmix package performs … Continue reading →

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One Solution to the ‘stringsAsFactors’-Problem Or: Hell-Yeah there is HELLNO

December 23, 2015
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One Solution to the ‘stringsAsFactors’-Problem Or: Hell-Yeah there is HELLNO

Base R's stringsAsFactors default setting is supposedly the most often complained about piece of code in the whole R infrastructure. A search through the source code of all CRAN packages in December 2015 (Link) resulted in 3,492 mentions of stringsAsFactors. Most of the time these explicit mentions where found within calls to data.frame() or as.data.frame() and simply set...

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Diagnosing the Multilevel Marketting Trap: How MLM Survives Only through New Entrants

October 23, 2015
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Diagnosing the Multilevel Marketting Trap: How MLM Survives Only through New Entrants

Over the years I have been amazed by how many friends of mine who seem otherwise very intelligent have gotten involved in Multilevel Marketing (MLM).And, as most people who have been involved with these organizations, all of my friends involved in thes...

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The other carbon dioxide problem.

August 2, 2015
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The other carbon dioxide problem.

Researchers say ocean acidification may have dramatic effects on phytoplankton. Edit section Phytoplankton, tiny plants which live in the ocean, form the foundation of the marine food web and play an important role in the regulation of Earth’s climate. These wonderful organisms create their own food using sunlight, nutrients and carbon dioxide drawn down from… Continue reading...

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15 Easy Solutions To Your Data Frame Problems In R

June 11, 2015
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15 Easy Solutions To Your Data Frame Problems In R

R’s data frames regularly create somewhat of a furor on public forums like Stack Overflow and Reddit. Starting R users often experience problems with the data frame in R and it doesn’t always seem to be straightforward. But does it really need to be so? Well, not necessarily. With today’s post, DataCamp wants to show The post

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Ants, snakes, and the hydrophobic-polar model

December 1, 2014
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Ants, snakes, and the hydrophobic-polar model

The other night I was reading Lesk’s Introduction to Protein Science, when I came across this diagram: A lattice model represents the structure of a protein as a connected set of points distributed at discrete and regular positions in space, with simplified interaction rules for calculating the energies of different conformations. For small lattice polymers, it is...

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Frequentist German Tank Problem

March 20, 2014
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Frequentist German Tank Problem

The German Tank Problem: The Frequentist Way Many things are given a serial number and often that serial number, logically, starts at 1 and for each new unit is increased by 1. For example, German tanks in World War II had several parts with serial numbers. By collecting...

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