One of the things we're trying to do this year at Huddersfield is to make better use of our data archives:
…as each student goes through a library turnstile, data is written away…
…as each student borrows a book, more data is quietly written away…
…as each student uses an electronic resource, data is written away…
…as each student logs onto a PC, yet another piece of data is…
…okay, enough already – you get the idea!
We're not particularly interested in what an individual student has done, but we'd like to see the broader pictures. For example, we open the Library 24/7 at certain times of the year (e.g. Easter) – we'd like to know more about the kinds of students who come in late at night and leave early the next morning:
- are certain ethnic groups more likely to use the Library outside of the standard opening hours?
- do we get more male or female students using the Library in the wee small hours?
- are students coming in to use the computers, to issue/return items, or to sit quietly in a corner and study?
The answers to those kinds of questions tend to be found in several databases. The Sentry database tells us when someone entered the Library, but it doesn't tell us if they are male or female, Asian or Caucasian – that kind is information is stored in the Student Records System. Also, the Sentry database doesn't tell us what the student actually did – Circ transactions are in Horizon and PC usage info is stored in other databases.
So, long term we're looking at ways of trying to combine data from all of those sources into meaningful and enlightening stats.
"What has this got to do with showing borrowing suggestions in HIP?", I hear you ask!
Well, once I'd had a hunt around in our circ_tran table in Horizon, it seemed like a great use of all that historical Circ data would be to do an Amazon-like "patrons who borrowed this book also borrowed…".
Before I proceed with the "how to", I've got a hunch that not everyone has got a circ_tran table – it might be something that SirsiDynix needs to set for you, rather than a default table that ships with Horizon (can anyone confirm this?)
The circ_tran table contains (amongst other things) two very useful bits of information – the borrower# and the item# of the item they borrowed. You can use the item# to look up the bib# of that item (using the item table).
Once you've got the borrower# and bib#, you can use that to create two lists of data:
- a list of all the bib#s that a specific borrower has ever borrowed
- a list of all the borrower#s who have borrowed a specific bib#
To build the list of borrowing suggestions, you start with a bib# and:
- 1) build the list of all the borrower#s who have borrowed that bib#
- 2) for each of those borrower#s, compile all the bib#s of all the items they've borrowed to a single big list of bib#s
- 3) take that big list and count how many times each bib# appears in the list
- 4) sort your list of individual bib#s by the count of how many times they appear in the big list
…those bib#s that appear the most times in the big list are therefore the most appropriate ones to suggest.
Unfortunately those 4 steps can take some serious CPU time, so it's not possible to do it on the fly as each of your patrons brings up a full bib page in HIP. Therefore, you need to pre-process each of your bib#s to generate a list of other suggested bib#s.
I wrote a Perl script this evening (which I'll make available soon) that slurps up the entire circ_tran table into your PCs memory and then processes each of the bib#s to create up to 10 other suggested bib#s. Each of those suggestions is then pumped into a MySQL database where it will sit until a patron views that bib#s page in HIP.
The only real drawback is that it's not working with your circ_tran data in real time – the list of 10 possible suggestions per bib# won't change until I run the slurping Perl script again to rebuild all of the suggestions. On our database of 2,046,180 circ_tran entries, that took about 3 hours to process. So, in theory, you could schedule it to run once a week or once a month.