I meet a man walking down the street, who I know has two children. He introduces me to his son, what is the probability that his other child is a girl? Continue reading

## Goodbye Google Reader

As we say goodbye to one of my favourite Google features it is time to find a replacement. Continue reading

## Standard Deviation in IDL

The built in IDL standard deviation function in IDL, STDDEV, uses the moment function which treats the standard deviation as a sample, rather than a population. A short programme can give us both options. Continue reading

## Standard Deviation of Noise in TV Viewing Figures

As discussed in my last post we found that ‘the standard deviation of the noise in viewers is about 20% of the range of viewers’ for Grey’s Anatomy. I wanted to see if a similar figure was true for other TV shows. Continue reading

## Graphical Analysis of Grey’s Anatomy Viewing Figures

I recently started watching Grey’s Anatomy which I’ve been enjoying. However a friend of mine told me that the later episodes are not as good. So I thought I would have a look if the viewing figures reflected this. Continue reading

## Google Map Maker UK

Since last Thursday Google’s excellent Map Maker has been made available for UK users. Continue reading

## Inactive Account Manager

Are you leaving a digital will? On Thursday Google announced a new feature called ‘Inactive Account Manager‘, described first in the Google Public Policy Blog. Continue reading

## Newton’s Method for Solving the Inverse Geodesic Problem in IDL

There are a number of approaches to solve the inverse geodesic problem, this post provides the IDL code to use Newton’s method as described by Karney (2012) in ‘Algorithms for geodesics‘. Continue reading

## Velocity Required for Loop the Loop

Chris (@chris2306) got asked how fast you would need to be going to complete a loop the loop. This is what we got. Continue reading

## Extreme Space Weather Events

After months of hard work the Royal Academy of Engineering have published their report on the impact of extreme space weather events in the UK – the media have reported on it with varying success… Continue reading