Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. The sample...

Random-sampling mechanism Resampling (statistics) Pseudo-random number sampling Sample size determination Sampling (case studies) Sampling bias Sampling distribution...

Since the sample error can often be estimated beforehand as a function of the sample size, various methods of sample size determination are used to...

the sampling mean distribution obtained is equal to the variance of the population divided by the sample size. This is because as the sample size increases...

{\displaystyle c_{\rm {v}}\,} itself. For many practical purposes (such as sample size determination and calculation of confidence intervals) it is s l n {\displaystyle...

subgroups' sample sizes proportional to the amount of data available from the subgroups, rather than scaling sample sizes to subgroup sizes (or to their...

a sample is taken without knowing, in advance, how many observations will be acceptable according to some criterion. In such cases, the sample size N...

statistics, an effect size is a value measuring the strength of the relationship between two variables in a population, or a sample-based estimate of that...

the mean square error (MSE) of the regression. The denominator is the sample size reduced by the number of model parameters estimated from the same data...

number of interviews and costs given the desired accuracy. For a fixed sample size, the expected random error is smaller when most of the variation in the...

probability mass function g(x) the range of the Xi is the range of a sample of size n from a population with distribution function G(x). We can assume without...

n {\displaystyle n} is the sample size: Sample median ∼ N ( μ = m , σ 2 = 1 4 n f ( m ) 2 ) {\displaystyle {\text{Sample median}}\sim {\mathcal {N}}\left(\mu...

given sample size. The sampling distribution depends on the underlying distribution of the population, the statistic being considered, the sampling procedure...

x ¯ {\displaystyle {\bar {x}}} is the sample mean, s is the sample standard deviation and n is the sample size. The degrees of freedom used in this test...

a computer, sampling from it to form a new sample (called a 'resample' or bootstrap sample) that is also of size N. The bootstrap sample is taken from...

expected value of the raw sample moment is equal to the k-th raw moment of the population, if that moment exists, for any sample size n. It is thus an unbiased...

square root of the sample size, and is estimated by using the sample standard deviation divided by the square root of the sample size. For example, a poll's...

population. Sampling Simple random sampling Stratified sampling Stratification(clinical trials) Quota sampling Sample size determination Sampling error Nickolas...

variability, and sample size), and the effect size of interest. High statistical power is related to low variability, large sample sizes, large effects...

(intervals) are adjacent and are typically (but not required to be) of equal size. Histograms give a rough sense of the density of the underlying distribution...

{y}})^{2}}}}}} where n {\displaystyle n} is sample size x i , y i {\displaystyle x_{i},y_{i}} are the individual sample points indexed with i x ¯ = 1 n ∑ i =...

univariate sample of quantitative data. It can also refer to the population parameter that is estimated by the MAD calculated from a sample. For a univariate...

that four numbers are observed or recorded, resulting in a sample of size 4. If the sample values are 6, 9, 3, 7, the order statistics would be denoted...

hypothesis test used in the analysis of contingency tables when the sample sizes are large. In simpler terms, this test is primarily used to examine whether...

Cross-validation, sometimes called rotation estimation or out-of-sample testing, is any of various similar model validation techniques for assessing how...

may be two columns of a given data set of observations, often called a sample, or two components of a multivariate random variable with a known distribution...

chance of selection). The ratio of the size of this statistical sample to the size of the population is called a sampling fraction. It is then possible to estimate...

is the distribution function associated with the empirical measure of a sample. This cumulative distribution function is a step function that jumps up...

population size and E is the expectation operator. Assuming that the variance is not infinite and that the central limit theorem applies to the sample then...

Opinion Research World Association for Public Opinion Research Sample size determination Straw poll Swing (politics) Types of democracy Wiki survey Tankard...