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## Partial likelihood

Partial likelihood is a product of conditional likelihoods, used in certain situations for estimation and hypothesis testing. The basis of estimation in Cox’s proportional hazards model.

## Partial Correlation

Partial Correlation is the correlation between a pair of variables after adjusting for the effect of a third.

## Partial Autocorrelation

Partial Autocorrelation is a measure of the correlation between the observations a particular number of time units apart in a time series, after controlling for the effects of observations at intermediate time points.

## Parsimony Principle

Parsimony Principle is the general principle that among competing models, all of which provide an adequate fit for a set of data, the one with the fewest parameters is to be preferred.

## Parking lot Test

A test for assessing the quality of random number generators.

## Pareto Plot

A bar chart with the bars ordered according to decreasing frequency enhanced by a line joining points above each bar giving the cumulative frequency.

## Parametric Methods

Procedures for testing hypotheses about parameters in a population described by a specified distributional form, often, a normal distribution. Student’s t test is an example of such a method.

## Parametric Hypothesis

A hypothesis concerning the parameter(s) of a distribution. For example, the hypothesis that the mean of a population equals the mean of a second population, when the populations are each assumed to have a normal distribution.

## Parallel Distributed Processing

Information processing involving a large number of units working contemporaneously in parallel with units, like the neurons of the brain, exciting or inhibiting one another.

## Parallel Coordinate Plots

A simple but powerful technique for obtaining a graphical display of multivariate data. In this plot, the variable axes are arranged horizontally, each parallel to the one above it. A line is then plotted for each observation by joining the appropriate variable values on these axes.