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Stackmat test - please help

Sakarie

Veteran
Joined
Oct 19, 2008
Messages
459
Location
Alingsås, Sweden
WCA
2008SKAR01
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Stefan Pochmanns review of the QJ timer showed that the ORDINARY Stackmat Timer, the ones used in competition, maybe isn't totally accurate.

He tried (2:50 in the video) to do 100 times as close to 1.00 as possible, and it showed that it had certain times that didn't occur at all. Every third hundredth of a second, starting at 0.92, didn't get any "hits" at all, while the other ones avareged around 8-9. Coincidence?

I did a hundred tries, and this was the result:

0.81 1
0.82 -
0.83 -
0.84 2
0.85 -
0.86 2
0.87 -
0.88 4
0.89 -
0.90 4
0.91 7
0.92 -
0.93 7
0.94 25
0.95 -
0.96 16
0.97 11
0.98 -
0.99 -
1.00 11
1.01 -
1.02 20
1.03 14
1.04 -
1.05 12
1.06 19
1.07 -
1.08 6
1.09 11
1.10 -
1.11 7
1.12 -
1.13 8
1.14 -
1.15 4
1.16 3
1.17 -
1.18 2
1.19 -

(Yes, I wasnt very good at it, but that's not the point.)

My timer does the exact same thing!! I have NO hits on every third hundredth of a second, starting at 0.89, until 1.13!! This is NOT what a as-professional-as-a-hobbytimer-can-be should be! Also I get no hits on 0.99, which very unlikely is a coincidence.

I want as many as possible to do at least 50 times try to stop at 1:00, in one way or another write down your result, and post it. Both me and Pochmann used the "new" one with two extra buttons and a line-in. If you are NOT using that version, write it down. The reason you should do at least 50 is that otherwise that the statistic is better with as large number as possible (100 tries take like 3 minutes, totally reasonable).

How to do it pretty easy in the next post.
 
Use CCT, and plug in your Stackmat Timer. That way, you can just do it, and every time will be recorded. When you've done enough tries, you highlight all the tries you've made, and ctrl+c.

Paste it in Excel or equivalent, mark the column with the time, and sort them alphabetically. Count how many times you got the time, and write in the next column. When you're done, delete every row without a number of how many times it occurred, so the only remaining is what time it's about, and how many times that time occurred. Then, select both columns and sort it alphabetically again. Copy and paste into this forum, and add the times that didn't get any hits.

I'm sure there are better ways, but this works. If you have a better one, please share it.
 
Well, I just analyzed WCA data to illustrate the patterns. Here's the distribution for 3x3x3 times from 10 to 20 seconds:

stackmat_accuracy.png


And here's the distribution for 3x3x3 times from 8 to 80 seconds:
http://stefan-pochmann.info/misc/stackmat/stackmat_accuracy.html
 
i checked 2*2, 3*3, Clock, Master Magic (all single) but only found one 9.99s
also there's no 0.99s in any results

actually when my friends & i had a cube meet last year, we had tried a whole hour to hit a 0.99s, but no one made it:(
 
i checked 2*2, 3*3, Clock, Master Magic (all single) but only found one 9.99s
There are four in 2x2x2 and one in Pyraminx.

also there's no 0.99s in any results

http://www.worldcubeassociation.org/results/p.php?i=2006KUTI01#magic
http://www.worldcubeassociation.org/results/p.php?i=2006BUUS01#magic
http://www.worldcubeassociation.org/results/p.php?i=2008HUXI01#magic
http://www.worldcubeassociation.org/results/p.php?i=2007CHUE01#magic

Please, if you do something like this, do it right (you could've, this data is solely taken from the public export).
 
i checked 2*2, 3*3, Clock, Master Magic (all single) but only found one 9.99s
There are four in 2x2x2 and one in Pyraminx.

also there's no 0.99s in any results

http://www.worldcubeassociation.org/results/p.php?i=2006KUTI01#magic
http://www.worldcubeassociation.org/results/p.php?i=2006BUUS01#magic
http://www.worldcubeassociation.org/results/p.php?i=2008HUXI01#magic
http://www.worldcubeassociation.org/results/p.php?i=2007CHUE01#magic

Please, if you do something like this, do it right (you could've, this data is solely taken from the public export).

sorry i found i only checked the best single result:fp a big facepalm
 
Here are my trials on a normal speedstacks timer:
(Note: If I was more then .15 off, then I didn't count it.)

.85:
.86: 3
.87:
.88: 2
.89:
.90: 6
.91: 2
.92:
.93: 15
.94: 9
.95:
.96: 10
.97: 12
.98:
.99:
1.00: 7
1.01:
1.02: 10
1.03: 5
1.04:
1.05: 12
1.06: 6
1.07:
1.08: 6
1.09: 14
1.10:
1.11: 7
1.12:
1.13: 14
1.14:
1.15: 5
 
Last edited:
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