Monthly Archives: April 2012

Linking apples liking to analytical data

April 2, 2012
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Linking apples liking to analytical data

This post describes the last puzzle piece of the model. The link of instrumental to sensory data. Together with the previous pieces this leads to a model starting from physico-chemical measurements, to sensory data, to consumers' perception and finally...

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Simple data mining and plotting data on a map with ggplot2

April 2, 2012
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Simple data mining and plotting data on a map with ggplot2

In this post I use OpenStreetsMaps and ggplot2 to plot geographically were psychologists live, using data from a facebook document.

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Replacing market indices

April 2, 2012
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Replacing market indices

If equity markets suddenly sprang into existence now, would we create market indices? I’m doubtful. Why an index? The Dow Jones Industrial Average was born in 1896.  This was when computers were humans with adding machines (but they did do parallel processing).  At that point boiling “the market” down to a single number had value. … Continue reading...

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Sunday evening, stupid games…

April 1, 2012
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Sunday evening, stupid games…

This evening, while I was about to wash the dishes, I heard my elders starting a game (call them Him and Her) Him: "I have picked - in my head - a number, lower than 50. Try to guess..." Her: "No way, too difficult..." Him: "You can try five differ...

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Missing Data Club

April 1, 2012
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Welcome to Missing Data Club. There are only three rules. Rule #1 is: There is no missing data. Rule #2 is: THERE IS NO MISSING DATA! Rule #3: If you’ve never built a model using missing data – you must do it...

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Quantitative finance and computational systems

April 1, 2012
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Quantitative finance and computational systems

I’m writing a book proposal based on the lecture notes for my R for Quants workshop I conducted at the …Continue reading »

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A better way of saving and loading objects in R

April 1, 2012
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A better way of saving and loading objects in R

Hadley Wickham (@hadleywickham) this week mentioned on Twitter his preference for saveRDS() over the more familiar save(). Being a new function to me, I thought I’d take a look… save() and load() will be familiar to many R users. They … Continue reading →

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