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LCWO Discussion Forum [Atom LCWO Forum Feed]

This is a simple discussion forum for LCWO users. Feel free to use it for any kind of discussion related to this website.

Thread: Koch Test Results?

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AuthorText


Posted: 2014-09-02 02:51
I've just moved to Koch Lesson 6, for the first run got these results:

Groups: 60 (300 characters), Errors 128 = 42.6%
Real speed: 275 characters / 181.1 seconds = 18.2 wpm / 91.1 cpm
Levenshtein-Errors: 29 = 9.6 %

Yet the results also (confusingly) say I "got better than 90%" - with 128 errors, how can this be? :-/

=Alan R.
Administrator


Posted: 2014-09-02 08:16
Alan,

you probably added an extra space somewhere, or wrote two groups together without a space, and the recognition of all subsequent groups then failed. LCWO's algorithm for figuring out such errors isn't very advanced :)

As a "backup" to the normal grading, there's also a calculation of the Levenshtein distance (which is a measure of "how different" two character strings are) which yielded only 29 errors, which is below the 10% error rate threshold.

73
Fabian


Posted: 2014-09-02 14:15
Thanks Fabian - sorta thought that might be the case. Anyway - I think one can get an instinctive 'comfort level' at any give speed, and can sense when they are ready to move up. Just looking at the red errors helps getting a visual sense of where one is in progress.

=Alan R.
[deleted]

Posted: 2014-09-03 23:53
Here is another example (number 3), hopefully you can read this one.
Levenshtein errors but an error free record.

Result (16/16 wpm):
Sent Group Received Group Errors
/''/: /''/: /''/: 0
''=?' ''=?' ''=?' 0
.//?' .//?' .//?' 0
//:?' //:?' //:?' 0
./'', ./'', ./'', 0
:=?:: :=?:: :=?:: 0
./?'. ./?'. ./?'. 0
??'', ??'', ??'', 0


Groups: 8 (40 characters), Errors: 0 = 0%

Real speed: 52 characters / 74.4 seconds = 8.4 wpm / 41.9 cpm

Levenshtein-Errors: 12 = 30 %

Good! Your accuracy is better than 90%. You may want to try the next lesson!

Continue Training
[deleted]

Posted: 2014-09-04 00:03
Now with 20/20 4 errors (ok) and Levenshtein also not matching, may be helpfull detecting te problem:

Result (20/20 wpm):
Sent Group Received Group Errors
:/':? :/':? :/':? 0
:?'./ :?'./ :?'./ 0
/,',? /,'/? /,',? 1
,./'' ,./'' ,./'' 0
/':?, /':?, /':?, 0
.///? .///? .///? 0
.,.:, .,.:, .,.:, 0
'':?: '':?: '':?: 0
/.==, /.,,= /.==, 3
'//,= '//,= '//,= 0


Groups: 10 (50 characters), Errors: 4 = 8%

Real speed: 59 characters / 68.6 seconds = 10.3 wpm / 51.6 cpm

Levenshtein-Errors: 13 = 26 %

Good! Your accuracy is better than 90%. You may want to try the next lesson!

Continu


Posted: 2014-09-09 04:36
I'm a Boy Scout volunteer and we require 5wpm reading and keying minimum in order to wear the Morse Code language strip on our scout shirt. Can this site provide a good test for boys and adults that want to earn their language strip to prove they have met the requirements?


Posted: 2014-09-09 09:27
Tim,

Nice to read that Morse is kept alive with the next generation.

This site had ebook2CW and a chapter for making MP3 files with 5 wpm of entered text. When you burn a CD you have a controlled examination with supervision of a local scouting leader.

Concerning keying: give them a text, put a key to a Morse decoder, or a PC with a decoding program running, and that will show what they keyed in.
A stopwatch may be used to make sure they reached 5 wpm. When you need sound as input, a battery and a high tone buzzer will do, you often find them in good condition in defect alarm clocks

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$Id: forum.php 62 2015-01-12 17:34:44Z fabian $