sheldon
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Modern_analog,
You might also want to read some papers in addition to Pelgrom's,
"Understanding MOSFET Mismatch for Analog Design", P. Drennan and C. McAndrew, JSSC, March 2003
"Measurement and Modeling of MOS Transistor Current Mismatch in Analog IC’s", E. Felt, et al, ICCAD, 1994
The issue of mismatch modeling is complex than mismatch is proportional to sqrt(W*L), as Rob mentions you also need to consider the operating point.
This is certainly a useful rule of thumb for designers to keep in mind. However, it includes some assumptions that designers need to understand and they should not blindly extrapolate based on it.
Best Regards,
Sheldon
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