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File: TrackingAnItemOnHackerNews

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----
My latest posts can be
found here:
  * ColinsBlog
----
Previous blog posts:
  * HackerNewsUserAges
  * PokingTheDustyCorners
  * ThereIsNoTimeForThis
  * PublicallySharingLinks
  * LearningTimesTables
  * GracefulDegradation
  * DiagrammingMathsTopics
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  * AMatterOfConvention
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  * BinarySearchReconsidered
  * TwoEqualsFour
  * TheLostPropertyOffice
  * TheForgivingUserInterface
  * SettingUpRSS
  * WithdrawingFromHackerNews
----
Additionally, some earlier writings:
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  * ColinsBlog2010
  * ColinsBlog2009
  * ColinsBlog2008
  * ColinsBlog2007
  * ColinsBlogBefore2007
********
!!! Tracking an item on Hacker News - 2015/05/02
[[[> https://www.solipsys.co.uk/images/AgesItemProgress.png ]]]
A couple of weeks ago I had an exchange with a user on
''' <a href="https://news.ycombinator.com/news">Hacker News</a>
about user "ages."  I wrote that up in my previous post,
and then
''' <a href="https://news.ycombinator.com/item?id=9406965">submitted it.</a>
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.

[[[< https://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.

[[[> https://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.

[[[< https://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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----
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<<|
----
!! Comments

I've decided no longer to include comments directly via the Disqus
(or any other) system.  Instead, I'd be more than delighted to get
emails from people who wish to make comments or engage in discussion.
Comments will then be integrated into the page as and when they are
appropriate.

If the number of emails/comments gets too large to handle then I
might return to a semi-automated system.  That's looking increasingly
unlikely.

********<