More difficult to estimate is the cost to Mindanao in lost opportunity and continuing poverty.
He said it was difficult to estimate the true effect because cancer may develop only years after exposure to air pollution.
But it is very difficult to estimate size of a species from a distance - especially if you are unfamiliar with them.
The report says there is a lack of data on the condition, making it difficult to estimate the real burden of the disease.
While it is difficult to estimate the likelihood of this scenario, it should at a minimum give us pause as we evaluate our expansive tendencies.
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While it is difficult to estimate how much of an impact this trend has had on the first-quarter trade balance, it is an important trend to watch since it suggests bubble activity.
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Although Pfizer (nyse: PFE - news - people) gets some revenue from Celebrex sales under an alliance agreement, it is difficult to estimate how Celebrex did, because the company doesn't report revenue from such agreements by drug.
Rush-hour delays and longer commuting times for people who live near Birmingham Interchange or Euston station in London could result as the volume of traffic is set to increase, and again it is difficult to estimate the precise economic cost, the IEA reasons.
Canadian government officials said it would be difficult to offer an estimate of lost revenue because deductions for golf have been excluded for the past 40 years.
The prime minister's spokesman said the evidence from 2004 highlights how difficult it was to accurately estimate migration levels.
While experts said it is difficult to determine how many people belong to hate groups, they do agree with an SPLC estimate that claims there are about 900 operating now, a 40 percent increase from 2000.
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Buying the necessary copper could prove equally difficult, since analysts estimate global exchange stocks amount to only 140, 000 tonnes, of which the LME holds 65, 000.
Of all the returns we estimate, perhaps inflation is the most difficult to forecast.
The information helps bidders estimate how easy or difficult the transition from TV to their own planned services might be, says Laura Fontaine, a Comsearch director.
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