Sentence examples for estimates is difficult from inspiring English sources

However, methodologies for the estimation of tree root biomass are varied and their effectiveness in terms of the precision of biomass and carbon estimates is difficult to evaluate.

Making precise estimates is difficult because of expected fluctuations in enrollment over the year.

The possible effect of migration to and from the United Kingdom on these estimates is difficult to assess.

Evaluating the quality of national prevalence estimates is difficult because those estimates are often reported only in context documents without clear description of the underlying data source(s).

The validation of fire emission estimates is difficult, since the emissions from fire to fire are highly variable, and direct flux measurements from fires are extremely difficult.

One caveat to our meta-analysis is the significant heterogeneity observed between studies, although its impact on summary risk estimates is difficult to assess.

Because some Muslims are new immigrants and others are recent converts, reliable estimates are difficult.

A report released this week by the General Accounting Office, an investigative branch of Congress, said such estimates were difficult to confirm.

Because they are solitary and hard to spot, population estimates are difficult, though the foundation believes there are fewer than 30,000 in the country.

Franklin Thomas, chairman of the Sept. 11 Fund, said that although estimates are difficult, his instinct told him that no more than 25percentt of the fund's remaining $251.4 million would be paid out as cash grants to individual families and victims.

Several art experts and dealers said that a major Deas work would easily go for millions of dollars at auction — though estimates are difficult because it has happened so rarely.