Hi All,
I am a biochemist with limited background in statistics, so please forgive
the naivety of my question.
I am interested in estimating the precision of a measurement system and the
variance components of three factors.
This is how the experiment was designed: 5 samples, each considered a level
were measured. Each sample was measured twice a day (run) for 10 days (days)
by two different operators (operator). Each measurement was replicated 3
times. The factor (days) is not continuous as the goal was to generalize the
estimation of the precision of the measurement system for all days.
I have read a number of posts on this list and also read Mr. bates online
book of lem4.
>From what I understood the model would be a crossed design and I  run the
following analysis:

Measurement ~ samples + (1|days) +  (1|run) +(1|operator)

Is this model appropriate? and is there a way to gauge the precision of the
the estimates of the variance components by a confidence interval?

Thank you for your help

Regards

Karim

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