Keywords

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If Y j  ∼ N(0, 1), j = 1, , J, with Y 1, , Y J independent, then

$$Z ={ \sum \nolimits }_{j=1}^{J}{Y }_{ j}^{2} \sim {\chi }_{ J}^{2}, $$
(E.1)

achi-squared distribution with J degrees of freedom and \(\mbox{ E}[Z] = J,\mbox{ var}(Z) = 2J\).

If X ∼ N(0, 1), Y ∼ χ d 2, with X and Y independent, then

$$\frac{X} {{(Y/d)}^{1/2}} \sim \mbox{ T}(0,1,d), $$
(E.2)

aStudent’s t distribution with d degrees of freedom.

If U ∼ χ J 2 and V ∼ χ K 2, with U and V independent, then

$$\frac{U/J} {V/K} \sim \mbox{ F}(J,K), $$
(E.3)

theF distribution with J, K degrees of freedom.