[R] comparing factor and value data (rather offtopic)

[Petr PIKAL]

Dear all

I have a bit off topic question. I need to compare some measured values 
with people's subjective estimation (was not done yet). Before I start the 
experiment I would like to consult some appropriate literature. 

Basically I will have several samples and several people can evaluate all 
samples. They can e.g. rank samples according to some feature orthey can 
do something else. 

Can I simply compare the average ranks with measured value? Where to look 
for some info about planing such experiment and evaluating results?

Thanks for any hint.
Petr