Prevalence of dementia is difficult to establish or estimate with certainty, and estimates are affected by differences in study design, disease definition, diagnostic criteria thresholds, and calculation methods e.g. [ 3, 4].
Identification of which and how many genes were available for analysis if the sample size was further reduced was difficult to estimate with certainty given the limited number of samples sizes in our experimental design.
Supply and demand can be estimated with some certainty.
With the aid of a simple analytically tractable theory, we show that an exponential loop-length distribution is advantageous when the distance to the nest can be estimated with some certainty and that a bi-exponential distribution is advantageous when there is considerable uncertainty regarding the nest location.
SPE reserves can be defined as those quantities of petroleum that, by analysis of geological and engineering data, can be estimated with reasonable certainty to be commercially recoverable, from a given date forward, from known reservoirs, and under current economic conditions, operating methods, and government regulation.
Proven reserve refers to the quantity of gas in a gas reservoir which can be estimated with reasonable certainty (high degree of confidence) to be commercially recoverable from known reservoir under the present economic and operating conditions (Imam 2013; Morehouse 1997).
However, even using these improved methods, the total number of bacterial species is not known and cannot even be estimated with any certainty.
The clustering approach is difficult because IBD is not usually estimated with 100% certainty or 100% power.
However, the uncertainty estimated by the proposed method will be slightly underestimated, because we are assuming the IPD in Step A (in the description of the method above) are estimated with complete certainty.
