I see the makings of a great project here... a standard set of routines
for time/frequency/stability statistics. My only request is to code
unobfuscatedly (sp?) to make translation into other languages easier
(e.g., I'd love a perl module with these functions, but am a complete
schmoe at figuring out C).
John
----
John Miles wrote:
If you'd like to make the C source available, I'll look at building an
incremental version...?
-- john, KE5FX
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Magnus Danielson
Sent: Monday, January 18, 2010 7:10 PM
To: Tom Van Baak; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Modified Total Deviation calculation
Hi!
Just to let people know...
Tom Van Baak wrote:
TOTdev 0.2922318781 0.0913474326 0.0340653025
MTOTdev 0.2303857898 0.0555288598 0.0195467513
HTOTdev 0.2093297293 0.0958776504 0.0305163951
The MTOTdev numbers according to page 118 (of PDF, page number 108
according to the printed pagenumbers) should be
Modified Total Dev 2.418528e-01 6.499161e-02 2.287774e-02
Do anyone happend to have an implementation (in source) of MTOTdev at
hand giving the NIST SP1065 numbers?
Please note that W. Riley has about the same document in his Handbook,
and it reflects the same number. I would also suspect that a STABLE32
run would give those numbers.
Almost but not quite; Stable32 gives:
Tot Dev (1,10,100) 2.9223e-01, 9.1347e-02, 3.4065e-02
Mod Tot Dev (1,10,100) 2.0664e-01, 5.5529e-02, 1.9547e-02
Had Tot Dev (1,10,100) 2.9439e-01, 9.6148e-02, 3.0504e-02
I don't use total deviation here myself but I'll look into it for you.
With the kind assistance of Tom, we where able to get the answer. The
values given as results in the table on page 118 of NIST SP1065 had been
bias-adjusted with 1/sqrt(0.73) to overcome the bias. My numbers now
correlated with that table for MTOTDEV and TTOTDEV.
I can now continue with other algorithms.
Many thanks goes to Tom and for Bill Riley to provide the answer!
Cheers,
Magnus
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