A finding of lasting pharmacological interest from these studies was the identification and partial isolation of the slow-reacting substance of anaphylaxis.

The cysteinyl leukotrienes make up the slow-reacting substance of anaphylaxis (SRS-A).

The Slow-reacting substance of anaphylaxis or SRS-A is a mixture of the leukotrienes LTC4, LTD4 and LTE4.

In the second stage, simple random sampling is usually used.

Under simple random sampling the bias is of the order O( n ).

Then the required information is collected from a simple random sample of the elements within each selected group.

On occasions simple random sampling procedures as just described do not meet the requirements of the research.

The principle of simple random sampling is that every object has the same possibility to be chosen.

In statistics, randomness is commonly used to create simple random samples.

For simplicity, the calculations here assume the poll was based on a simple random sample from a large population.

Thus all members of a simple random sample of 30 pupils from a mixed school could be girls.

This term is contrasted with the term simple random sample design.

A simple random sample is an unbiased surveying technique.

It means more efficient logistics and removes some of the human bias that may be there with simple random sampling.

For a simple random sample with replacement, the distribution is a binomial distribution.

This makes systematic sampling functionally similar to simple random sampling.

Implementation usually follows a simple random sample.

Then simple random sampling or systematic sampling is applied within each stratum.

One-sided coverage intervals for a proportion estimated from a stratified simple random sample.

Simple random sampling merely allows one to draw externally valid conclusions about the entire population based on the sample.

Conceptually, simple random sampling is the simplest of the probability sampling techniques.

For a simple random sample without replacement, one obtains a hypergeometric distribution.

In statistics, a simple random sample is a subset of individuals (a sample) chosen from a larger set (a population).

Exchangeable sequences of random variables arise in cases of simple random sampling.

It can produce a weighted mean that has less variability than the arithmetic mean of a simple random sample of the population.

In this technique, the total population is divided into these groups (or clusters) and a simple random sample of the groups is selected.

Simple random sampling can be achieved even when no frame is available but where the population members present themselves one at a time as potential sample members.

This process and technique is known as simple random sampling, and should not be confused with random sampling.