Copyright 2017 Jason Ross, All Rights Reserved

A single goat

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The Original Simulation

In The Monty Hall Problem – A Simulation In JavaScript we wrote a simulation for the Monty Hall Problem. The simulation consisted of two separate iterations through some JavaScript code that recorded the results of the competitor either changing their selection, or keeping their original choice, respectively.

Looking again at this, the idea of there being two iterations through the same code seemed a little excessive and made me start to idly wonder: could this be done in one iteration? This might make the simulation faster, although it would need to be timed to make sure of this, and it doesn’t take long to run anyway. It might improve the integrity of the simulation though. After all, what if something happens during those two iterations so that the odds involved in the second iteration change? It’s not likely but it’s just about possible – maybe the random number generator has a bug or some other strange side effect occurs, and then we can’t be sure what would happen.

If we could get all the information we need from a single game that should eliminate this possibility.

The Monty Hall Problem - It can really get your goat!

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The Problem

You are a contestant on a game show, and are allowed to select one of three doors. Behind one of the doors there is a car that you can win, and behind the other two doors are goats (You don’t get to keep the goats!). You choose a door and then the host, who knows what is behind every door, opens another door to reveal a goat. You are then given the chance to change your selection to the remaining door.

Should you stick with your original selection, or choose the other door instead?

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After a lot of persuasion and, frankly, nagging from all of us, my wife has finally started to share her rather awesome recipes and household hints and tips on her own web site. As she has lots of readers from outside Canada she asked me to put together a feature on her site showing the current weather in Calgary, partly so that her readers can identify with her and partly to prove that it really does get as cold here as we tell people!

I looked around the web for a free weather site (she’ll probably upgrade when the site gets more visitors) and found one with decent reviews at APIXU (https://www.apixu.com/). They have some weather widgets but, like all of the other weather sites, none were quite the right size and none displayed quite what she wanted. The API looked quite good though, so I decided to give the site a try.

Sometimes weird data sneaks up on your system and you don't see it until it's too late.

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Nobody likes work-related phone calls in the early hours of the morning; they have a nasty tendency to ruin your day, if not your weekend, and even worse they’re usually avoidable. The most avoidable of all are those caused by import data being, for want of a better word, garbage.

In the early days of a system things might work fairly well – the system has been developed to handle the data formats described in the “Data Transfer Specification” - but it doesn’t take long before things seem to go downhill quickly. Comparing the data you’re receiving to the specification, you’ll often discover that the description in the specification and the actual data your system receives are getting further and further apart. What should you do?

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When people or companies make data available through APIs, it might seem that the simplest thing to do is to just download the data whenever you need it. It’s true that this is simple but it’s also very inefficient, and this inefficiency will only get worse as your system’s demands increase. For big data / cloud/ large scale systems you need a different approach, especially as it might not be just you who pays.