If we do not have a CV issue, shouldn't CV and ICC be very close to each other, why are they so different?
Please treat the measurments of each outcome as an independent study. The sample is composed of homogenous subjects.
because they are NOT the same statistic. They do NOT measure the same standard deviation...there is no reason for them to be the same...to compare them is like comparing apples and oranges...
The CV reports the standard deviation in the Y dimension for any given X value as a percentage of the X.
ICC is calculated using the standard of the differences of repeated meaurements for any part. dimensionally think of this as being the standard deviation about a 45 degree line (or 1:1 line) for the 2 repeated readings. The ICC statistic gives the amount of 'repeatability' vs the amout of observed variation...
but at this point your measurement variation is awful (UNLESS the 4 parts you measured are representative of a VERY small part of your overall variation) I would suggest first cocnentrating on fixing that - then teh statisitcs will actually make more sense to you...