Sentence examples for problems of sample from inspiring English sources

Because of problems of sample size and relative lack of diversity, previous studies often failed to give clear-cut results.

Leaving aside potential problems of sample selection into NHIS enrollment, the regression analysis shows that, controlling for different set of confounding factors, enrollment in the NHIS is significantly and positively correlated with formal antenatal check-up intake (marginal effect always positive and statistical significant).

A project such as this, that only requests presence data, can never fully eliminate these problems of sample bias relating to presence-only data.

In the analysis of indCNV, in order to overcome problems of sample size, we also considered a window of distance that would include all SNP from inside up to 100 K upstream and downstream of a CNV.

Unlike survey data, censuses do not suffer from problems of sample sizes that are too small to allow estimates with the required precision, so they give researchers greater leverage to disaggregate indicators for various population and administrative subgroups.

Some are challenges common to using secondary data designed for other purposes but also are common to studying causes of maternal mortality, especially at this scale – problems of sample size, validity as well as comparability.

Problems of sampling design for human impacts detection in real world situations are discussed in relation to this study.

Due to technical problems of sampling and measurement, belowground competition has been given little attention compared with aboveground competition in mature multi-species forests ((Casper and Jackson [1997]); (Bauhus et al. [2000]); (Curt & Prévosto [2003]); (Bolte et al. [2004])).

However, doing direct PCR on sputum samples is associated with problems of sampling and inhibitors [ 22].

While maximum likelihood (ML) based methods of estimation make efficient use of all the data and readily allow estimates of covariance matrices to be constrained to the parameter space [ 5], the problems of sampling variation remain.

Survival analysis was performed using Cox proportional hazard mixed effect models with experimental cage fitted as a random effect to overcome pseudoreplication problems of sampling multiple mosquitoes from each cage (Terry Therneau (2009) coxme: Mixed Effects Cox Models.