Barker, Dan (rgh)

03-26-2000, 09:04 PM

Dear Biomech-l subscribers

To calculate the precision of a measuring device or experiment it is usual

to repeat the test a number of times ON ONE SPECIMEN, calculate the mean and

SD of the variable of interest i.e. strain, and then calculate the

coefficient of variation. CoV=standard dev./mean.

Is there however another method to assess precision when (for example 4)

DIFFERENT SAMPLES are tested twice each i.e. 8 measures (4 paired

measurements)? Therefore instead of multiple repeated tests of one specimen,

I have multiple specimens with only one repeated measure of each.

Thanks in advance

Dan Barker

Dan.Barker@rgh.sa.gov.au

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To calculate the precision of a measuring device or experiment it is usual

to repeat the test a number of times ON ONE SPECIMEN, calculate the mean and

SD of the variable of interest i.e. strain, and then calculate the

coefficient of variation. CoV=standard dev./mean.

Is there however another method to assess precision when (for example 4)

DIFFERENT SAMPLES are tested twice each i.e. 8 measures (4 paired

measurements)? Therefore instead of multiple repeated tests of one specimen,

I have multiple specimens with only one repeated measure of each.

Thanks in advance

Dan Barker

Dan.Barker@rgh.sa.gov.au

---------------------------------------------------------------

To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl

For information and archives: http://isb.ri.ccf.org/biomch-l

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