# F distribution

**F distribution** An important probability distribution used to test the significance of estimated mean squares in an analysis of variance and in regression analysis. Theoretically the F distribution is the distribution of the ratio of two independent random variables *S*_{1}/*f*_{1} and *S*_{2}/*f*_{2}, where *S*_{1} has the chi-squared distribution on *f*_{1} degrees of freedom and *S*_{2} has the chi-squared distribution on *f*_{2} degrees of freedom. Tables of critical values of the F distribution for ranges of *f*_{1} and *f*_{2} are widely available, but direct computation requires lengthy algorithms to compute the incomplete beta function.

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distribute , dis·trib·ute / disˈtribyoōt/ • v. [tr.] 1. give shares of (something); deal out: information leaflets are being distributed to hotels and guest house… Gaussian Distribution , Gaussian distribution(Gaussian curve, normal distribution) The values of a variable (x) are distributed systematically around their mean (x̄) accordi… Skewness , skewness A measure of asymmetry in frequency distributions. The skew in a distribution is the degree to which frequencies trail towards extreme score… Distributed computing , DDP Abbrev. for distributed data processing. See distributed processing.
DDP Chem. dichlorodiammineplatinum(II)
• Computing distributed data processi… Distributed Computing Environment , distributed system Any system in which a number of independent interconnected computers can cooperate. See distributed processing, client/server.
dis… Frequency Distribution , frequency distribution A table of the number of occurrences of each of a set of classified observations. The occurrences might arise from the throw o…

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**F distribution**