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What (who) is population quantile - definition
.jpg?width=200 "''Drosophila melanogaster''")
![Gene flow is the transfer of [[allele]]s from one [[population]] to another population through immigration of individuals. In this example, one of the birds from population A [[immigrate]]s to population B, which has fewer of the dominant alleles, and through mating incorporates its alleles into the other population.](https://commons.wikimedia.org/wiki/Special:FilePath/Gene flow final.png?width=200 "Gene flow is the transfer of [[allele]]s from one [[population]] to another population through immigration of individuals. In this example, one of the birds from population A [[immigrate]]s to population B, which has fewer of the dominant alleles, and through mating incorporates its alleles into the other population.")
![The [[Great Wall of China]] is an obstacle to gene flow of some terrestrial species.<ref name="Su Qu 2003"/>](https://commons.wikimedia.org/wiki/Special:FilePath/Greatwall large.jpg?width=200 "The [[Great Wall of China]] is an obstacle to gene flow of some terrestrial species.<ref name=\"Su Qu 2003\"/>")
![product]] of the contributions from each of its loci.](https://commons.wikimedia.org/wiki/Special:FilePath/Synergistic versus antagonistic epistasis.svg?width=200 "product]] of the contributions from each of its loci.")
.svg?width=200 "Current tree of life showing vertical and horizontal gene transfers.")
![logistic]] instead of geometric. Nevertheless, doubling times are applicable to both types of populations.''</small>](https://commons.wikimedia.org/wiki/Special:FilePath/G. stearothermophilus has a shorter doubling time (td) than E. coli and N. meningitidis.png?width=200 "logistic]] instead of geometric. Nevertheless, doubling times are applicable to both types of populations.''</small>")
Wikipedia
In statistics, a Q–Q plot (quantile-quantile plot) is a probability plot, a graphical method for comparing two probability distributions by plotting their quantiles against each other. A point (x, y) on the plot corresponds to one of the quantiles of the second distribution (y-coordinate) plotted against the same quantile of the first distribution (x-coordinate). This defines a parametric curve where the parameter is the index of the quantile interval.
If the two distributions being compared are similar, the points in the Q–Q plot will approximately lie on the identity line y = x. If the distributions are linearly related, the points in the Q–Q plot will approximately lie on a line, but not necessarily on the line y = x. Q–Q plots can also be used as a graphical means of estimating parameters in a location-scale family of distributions.
A Q–Q plot is used to compare the shapes of distributions, providing a graphical view of how properties such as location, scale, and skewness are similar or different in the two distributions. Q–Q plots can be used to compare collections of data, or theoretical distributions. The use of Q–Q plots to compare two samples of data can be viewed as a non-parametric approach to comparing their underlying distributions. A Q–Q plot is generally more diagnostic than comparing the samples' histograms, but is less widely known. Q–Q plots are commonly used to compare a data set to a theoretical model. This can provide an assessment of goodness of fit that is graphical, rather than reducing to a numerical summary statistic. Q–Q plots are also used to compare two theoretical distributions to each other. Since Q–Q plots compare distributions, there is no need for the values to be observed as pairs, as in a scatter plot, or even for the numbers of values in the two groups being compared to be equal.
The term "probability plot" sometimes refers specifically to a Q–Q plot, sometimes to a more general class of plots, and sometimes to the less commonly used P–P plot. The probability plot correlation coefficient plot (PPCC plot) is a quantity derived from the idea of Q–Q plots, which measures the agreement of a fitted distribution with observed data and which is sometimes used as a means of fitting a distribution to data.
