The arrangement of numerical data. The arrangement may be in accordance with magnitude, a frequency distribution, or in relation to geographical location, a spatial distribution.
- age d. — see
age distribution . - bimodal d. — the distribution has two regions of high frequency of observations separated by a zone of low frequency.
- binomial d. — a probability distribution associated with two mutually exclusive outcomes.
- cluster d. — a nonrandom distribution with observations aggregating about geographic or temporal variables. May be deceptive and merely reflect the distribution of an uneven population.
- frequency d. — a table or graph of the frequency of occurrence of each value of a variable.
- Gaussian d. — see normal distribution (below).
- hypergeometric d. — may apply to sampling without replacement of a finite population.
- lognormal d. — a distribution which is normal when the log values of the variable are considered.
- normal d. — a graph of the distribution appears as a bell-shaped curve which is symmetrical on the two sides of the vertical axis through the peak of the curve. Called also gaussian distribution.
- parent d. — the distribution (population) that was originally sampled.
- Poisson d. — see poisson distribution.
- regular d. — distributed at regular intervals of time or space; all values within its given interval are equally likely.
- sex d. — an increase in frequency in one sex, which includes neutered males and neutered females. Called also sex-linked or sex-associated.
- skewed d. — a distribution in which the curve illustrating it is not symmetrical but has a long tail on one or other side of the graph.
- spatial d. — variations in distribution related to position in space, e.g. close to the door of a barn.
- t-d. — see t-test.
- temporal d. — variation in distribution related to time, e.g. occurrence of disease incidents after visits by veterinarians, inseminators, feed salesmen.
