[CWB] Trying the new dispersion feature

[Stefan Evert]

Hi everybody (and in particular Andressa),

noticing the new Dispersion feature in CQPweb, I tried to play around with it, but I don't quite understand how to use it (and keep getting errors from the Web server if I do something too rash).

My first mistake was not to wait long enough after starting the dispersion analysis (@Andrew: can we get one of your fancy "busy spinners" there, too?).

With a relatively infrequent query term (which I picked to make the analysis faster), I get the following plot:



All the texts containing the search term end up clustered to the left instead of their normal position, which makes the plot very hard to read.  Possibly a rendering issue with my browser (Firefox 67)?

If I add a second query, the data points are also clustered to the left, though they don't occur exactly in the same texts (text overlap should be below 20%).

When I tried to add a third query with more hits (ca. 19,000), MySQL ran at 100% CPU for several minutes, but I didn't see any result in the browser (perhaps a timeout?).  Later, the DP and Juilland values do show up in the dispersion table.

A fourth attempt adds points to the plot, but now the dispersion scores (and number of texts) are "undefined".

Is there documentation for the new feature?  I'm clearly not using it correctly.

One small bug: If I select "New query" from the menu at the top right, I get redirected to a completely wrong URL (which is missing the path to CQPweb on the server: in my case I get "http://127.0.0.1/corpus" instead of "http://127.0.0.1/cqpweb/corpus/").

Best,
Stefan
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