An examination of BJA Dan grades (Part 2)

In this the second part of our examination of the British Judo Association (BJA) Dan grade register we shall look at the dates grades were awarded.

Dan grades awarded from 1960 to 2008

In this chart we see the number of dan grades awarded per year of all levels between 1960 and 2008. You will see there is a sudden jump in the early 1970s, followed by a steady growth (with peaks) ever since.

From the data we are not able to determine the reason for the sudden jump, common sense suggests that this has more to do with recording of data rather than actual changes in the grading structure.

The average (mean) number of Dan grades awarded per year is 237.16 (+/- 125.98).

The Average Growth year on year is 7.4 (+/-  49.24).

It is perhaps interesting that there is a visible increase in the number of Dan grades being awarded, when the “old wives tale” is that Judo is on the decline.

In this second chart we can see which months the Dan grades were awarded, which shows us that March, June and November are when a majority of grades are awarded.

This perhaps suggests the times of regular gradings. January and December we would expect to be less due to the Christmas season. What is surprising is that August is the month with the least grades awarded, it is summer, but personally I would have expected December and January to be lower. perhaps quite a few people grade just prior to the end of the year and after a Christmas break?

Of course, as mentioned in part one of this examination, this data is not complete. One big weakness is that we do not have a record of prior gradings, just the most recent. The data presented is a “snapshot” only of the BJA Dan grade register as of late March 2009.

4 thoughts on “An examination of BJA Dan grades (Part 2)”

  1. The graph showing the number of new dan grades awarded each year…how does it compare to a graph showing BJA membership each year? Are they a similar shape?

  2. Hi,
    sadly I don’t know that information, I might be able to find some of the information from the annual reports but I don’t think that they have them all the way back to 1960 on the website. It would also be REALLY painful to get it all from the PDF files. 🙂

  3. P.s. Your mosaics are wonderful! I especially like the one of “The Wave”. I have that image as a sticker on my laptop. 🙂

  4. I find the month awarded analysis fascinating.

    If i could give ‘my story’ here, I pursued my dan gradings in November, January and finally topping up the points that i needed in February.

    My reasons for commenting is that perhaps some of my reasons might explain the trends you were not expecting. This is threefold:

    1 University calendar Judo seems to be focussed around the end of the year and start of the next, being completely dormant from MAy to September. This will bulk up the winter months results.

    2 Big personal efforts are afforded by the desperate around the new year- the resolution bug- this normally fades by the start of march in my experience!

    3 The summer months seem to be exceptionally quiet for judo I have been trying to fill diaries over the summer months, and there is very little competitive opportunities about. People presumably go out BBQing and drinking and holidaying instead of going to their Dojo.

    This info might help, all be stuff already considered. Either way, thanks for the insight!

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