quick: mysql simple timeseries (1)
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Andrei (14)
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dev.spartancoder.com - stay out of your comfort zone (2)
1 day, 22 hours
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.. or how to answer to question like "Which is the most visited item in the last 7 days or 24 hours?". What we need to find is a way to store the number of visits for a discrete time interval, we need a data structure that will record the number of visits an item receives and group them together in small intervals. For this am going to use a table with the following structure: ...
Agenda Airbrushed From Obama’s Website (1)
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SG (47)
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Sweetness & Light (45)
1 week, 6 days
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A Washington Times “exclusive” of something we posted yesterday: EXCLUSIVE: Agenda disappears from Obama Web site Stephen Dinan Over the weekend President-elect Barack Obama scrubbed Change.gov, his transition Web site, deleting most of what had been a massive agenda copied directly from his campaign Web site. Gone are the promises on how an Obama administration would handle [...]
Mind the gap (1)
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junkcharts (22)
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Junk Charts (22)
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When comparing two time series, one typically wants to discuss the size of the gap as it changes over time. This Business Week chart, for example, depicted for readers the expanding gap between intra-day high and low prices of the S&P 500 for 2008. This chart construct is effective at pointing out large changes but lacks precision in conveying smaller differences, or trends. It is always a good idea to plot the gap directly, as ...
How to read a graph (2)
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junkcharts (22)
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Junk Charts (22)
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Via Gelman, here is a nifty book-buying map from Amazon, displaying the split between "red books" and "blue books" bought by Amazon users in each state in the months leading up to the 2004 and 2008 presidential elections. Gelman noted the similarity between the Amazon map and the red-blue split of rich voters.This post is about how to read a graph. Here are some things that come to mind looking at the map: Sampling bias: ...
