by Givemeanid Mon Aug 06, 2007 5:27 pm
I think it depends on the context...
I believe "estimate as" is usually, if not always incorrect
"estimated at" MAY be correct, depending on context, i.e. His net worth is estimated at between $15 and $16 MM.
"estimated to be" MAY be correct - That Egyptian period is estimated to be nearly 3000 years old.
For the GMAT, estimate to be is usually the correct phrasing...