| http://www.w3.org/ns/prov#value | - It is convenient to take gl to be the normal distribution, with density g i ??? ( y i ; ?? i , ?? i 2 ) = 1 2 ??? ???? i 2 ??? exp ??? { - ( y i - ?? i ) 2 2 ??? ?? i 2 } , ( 12 ) but the normal distribution is not positive-valued (i.e., variables can take values less than zero), so it is preferred to use distributions such as the lognormal and the gamma, which are defined for non-negative real nu
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