By Assad Ebrahim, on May 21st, 2014 (1,287 views)
Topic: General Interest
Duelling with pistols. If you were the one issuing the challenge, your dilemma was that custom dictated that your adversary be allowed to shoot first. Only then, if you were still able to shoot, would you be permitted to seek “satisfaction”.
How much of an advantage does the first shooter really have? In this article, we build a simple probability model, and implement a numerical model in a few lines of R code.
Two gentleman face off in the snow. Convention dictates the challenged shoots first.
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By Assad Ebrahim, on April 14th, 2013 (1,328 views)
Topic: Infrastructure
Your computer, kitted out with specialised software (mostly free) and configured for efficiency of use, is perhaps the single greatest ‘force multiplier’ that you can have as a Scientist, R&D Engineer, or Mathematician — unless of course you have a large budget and a team of bright minds at your disposal.
With good tools, a bit of creative joinery, and a good dose of persistence, you can become an army of one…
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By Assad Ebrahim, on November 15th, 2010 (5,436 views)
Topic: Data Science
(Statistics and Data Mining II)
Automated decision problems are frequently encountered in statistical data processing and data mining. An heuristic filter or heuristic classifier typically has a limited set of input data from which to arrive at a set of conclusions and make a decision: REJECT, ACCEPT, or UNDETERMINED. In such cases, preprocessing the input data before applying the heuristic classifier can substantially enhance the performance of the decision system.
In this article, I’ll motivate the use of a radartracking algorithm to improve the performance of automated decision making and statistical estimation in data processing. I will illustrate using the website visitation statistics problem.
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By Assad Ebrahim, on September 7th, 2010 (2,907 views)
Topic: Infrastructure
(Technology Infrastructure Series)
In case you’re taking seriously guarantees about uptime, reliability, or backups advertised by website hosting companies, you should know that most guarantees of service are an idealized concept, especially if you use a lowcost web hosting service. Now, this doesn’t mean you should avoid lowcost web hosts. What you should do is give a little thought to the “what if’s” that may arise, and what you can do before they arise to minimize the pain when they do.
In this article, I’ll go through a few situations you might want to consider, and some options you can use to reduce your risk.
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By Assad Ebrahim, on September 3rd, 2010 (8,689 views)
Topic: Data Science
(Statistics and Data Mining I)
For a variety of reasons, meaningful website visitation and visitor behavior statistics are an elusive data set to generate. This article introduces the visitor statistics problem, and describes seven challenges that must be overcome by statistical and data analysis techniques aiming for accurate estimates. Along the way, we’ll encounter the “Good News Cheap, Bad News Expensive” Paradox of Data Mining — or, why information is often used “asis”.
This article is the first in a series on algorithms, statistics and data analysis techniques (using free and open source tools) using the visitor statistics problem as a vehicle for illustration.
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By Assad Ebrahim, on July 5th, 2010 (3,030 views)
Topic: General Interest
Abstract
One of the fascinating areas to arise recently in applied mathematics has been Mathematical Finance. From a technical point of view, Mathematical Finance uses a broad range of sophisticated mathematics for its financial models, and relies on stateoftheart software engineering and computer hardware to implement these financial models, often in realtime.
Whether one is interested in technology or not, there is a kernel of core financial ideas at the heart of the global free market capitalist system that every literate citizen should understand. Whether we agree with their principles or with the inequities that are, arguably, the result, these ideas are in place across most of the world today. A closer look at mathematical finance will offer a better understanding of the mechanics of the modern financial world.
In this article, I’ll motivate the need for financial mathematics through a simplified account of the rise of the modern financial marketplace.
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