On the other hand, it is more difficult to estimate and track fast time-varying channel; thus, channel estimation errors might seriously degrade system performance in high-mobility systems.
For example, in the framework of treatment effect estimation in meta-analyses with binary outcome it is often more difficult to estimate the treatment effect if there are only few studies, if events are rare, or if heterogeneity is large.
Our results show that an increase in Ω makes the parameters α and γ more difficult to estimate accurately and at high Ω, γ is underestimated, while α is over-estimated.
The cancer risk related to the consumption of red meat is more difficult to estimate, because the evidence that red meat causes cancer is not as strong.
In non-O.E.C.D. countries, including China, it is more difficult to estimate oil demand, since detailed oil data are not available.
The number of missionaries making short-term visits is more difficult to estimate, but some organizations say it is as high as 10,000.
Closing costs may be more difficult to estimate because they usually include prepaid real estate taxes and various fees for title insurance, mortgage taxes and more.
This may be expressed: P − E = S + R. The runoff may be determined by measuring the flow of water in the rivers with stream gauges, and the precipitation may be measured by a network of rain gauges, but storage and evaporation are more difficult to estimate.
Therefore, it could be more difficult to estimate longer TSD.
At the leaf scale, the LMA is more difficult to estimate with indices.
2. The second transaction cost even more difficult to estimate is market impact cost.
