[PIC]A/D conversion clock rate

For the PIC16F872 and PIC16F72 microcontrollers, there are 4 different
clock rates available for A/D conversion.

Other than copying the rate somebody else used for a similar project,
how do you pick the appropriate clock rate?  Is this a trade-off
between speed and accuracy?  If so, how much accuracy must you
sacrifice for a higher clock rate?  If not, what other factors come
into play?

-- 
Jason Hsu
http://www.jasonhsu.com/swrwatt.html
http://www.jasonhsu.com/swrwatt-c.txt
http://www.jasonhsu.com/swrwatt-asm.txt
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