This principle emanates from probabilistic and statistics theory, where a random variable can be modelled based on a sample of observations with increasing confidence and accuracy as the size of the sample grows.
The most popular nonparametric estimator of a distribution based on a sample of observations is the empirical distribution, and the most popular method of nonparametric density estimation is the kernel method.
The estimated baseline distribution of PA levels was based on a large sample of observations from the HSE drawn from a wide age range, which may be a limitation if PA distributions change a lot with the age group.
Internal cross-validation of the final model was performed by bootstrapping (100 times), a computer-intensive statistical method and resampling technique based on random samples of observations to estimate error by systematically recomputing the statistics while omitting one observation at a time from the sample set [ 19].
Clearly the first and best solution would be to base costs on a representative sample of observations for all possible inputs and activities, but rarely do analysts have access to these data or the funds to generate them, even in the richest countries.
In the analysis of maximum sizes of large non-metallic inclusions in steels, the common extreme value analysis is only based on a sample of largest observations in control areas on polished planes, respectively.
To examine these hypotheses, this study applies gravity-type job accessibility indexes based on a study sample of 7077 observations in the Taipei Metropolitan Area, Taiwan, from the year 2009.
Suppose we aim to select p variables from S (S>> p) candidates as the nodes in Bayesian network based on a random sample of N observations.
Random forests were constructed by joining several of these regression trees, each based on a random sample of the observations and the explanatory variables, to explicitly take into account the variability associated with the construction of a single tree.
2. Cells based on samples of less than 10 observations are not reported.
