Tracking An Item On Hacker News

   
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Tracking an item on Hacker News - 2015/05/02

http://www.solipsys.co.uk/images/AgesItemProgress.png
A couple of weeks ago I had an exchange with a user on Hacker News about user "ages." I wrote that up in my previous post, and then submitted it. I was surprised that the item garnered enough attention to make it to the front page, but that was when a little foresight paid off. I don't usually bother with analytics on my site, but on this occasion I put a tracker on the page to count the number and times of page hits.

So I ended up with data on page hits, points, and ranking on the front page. Not really sure what to do with this data, but it seemed a good idea to plot it and see if there was anything to be seen.

http://www.solipsys.co.uk/images/AgesItemProgress2.png
We can see plots of the three values, with time running across the bottom. Times are BST, or GMT+1. The item was submitted at about 10:40, but I didn't start recording the position on the front page until 11:15, because that was when I first realised that the item had, in fact, got some attention.

We can see fairly clearly that the ranking (in yellow - inverted on the chart) gets to number 4, and then gradually declines. The points (in red) climb fairly steadily until the item falls off the front page at about 18:45. Unsurprisingly, the hits per minute are roughly correlated with the ranking. The higher the ranking (lower the yellow line) the more hits per minute.

http://www.solipsys.co.uk/images/HitRateVsRanking.png
This is especially obvious at about 17:30 when the item dips briefly off the front page. There's an immediate drop in page hits, and then when the item touches back into the front page the hits return, until the item again, and permanently, falls off the front page.

The second version of the plot shows that correlation much more clearly. There's a spike in page hits at 17:30 when the item first returns to the front page, then again on its last visit at about 18:05. This shows even more clearly the value (in page views) of getting to the front page of HN, as compared with just being on the "newest" page.

http://www.solipsys.co.uk/images/SecsPerHitVsRank.png
The correlation is unmistakable when we view the data as a scatter plot of page ranking versus hits per minute. The split in the plot at the ranking of 30 is blatant and unmissable. When the ranking is worse than 30, hits/min is generally below 5, whereas 30 and above and the hits/min is never below 15.

Total number of page views was around 15.5k, almost all unique IPs. At about midday the page was getting a roughly a view per second.

Just for interest I also plotted sec/hit against the current rank on the front page. Plotting a straight line through that we find that we get

 
    secs/hit ~ 1.75 + 0.075 * Rank

For what that's worth.


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