[ RadSafe ] Clarification : Validity / Usefulness . . .
Pete_Bailey at fpl.com
Pete_Bailey at fpl.com
Wed May 2 06:23:29 CDT 2007
Thanks to all that have responded....
I'm not after guidance on sampling frequency
or testing if two positive measurements are different . . .
What I'm after (and many spoke around ,but didn't directly answer):
In your world i.e., by your procedures
would you consider any one of the following
different pairs of R +-r to be 'not useable' for
comparison to whatever ( a limit, a prior sample, etc) ?
a. 110 +- 140
b. 480 +- 140
c. 270 +- 140
d. 630 +- 140
If your procedure would have you consider
a pair as 'not useable', what is the
basis of your procedure's decision process ?
As far as 'difference' of two positive results,
I am very much aware of, familiar with,
the "z score" , "zeta test"; it is standard stats.
BUT "by your procedures", what do you do when
one of the two is "less than (a number) " and you
don't have a standard deviation of the LLD value
and the other is R +-r ( with R not being far from a typical LLD value)?
- do you use the "z score test" & assume r to be applicable to the LLD
value ?
Hopefully, the above clarifies what I was attempting to ask yesterday....
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