- , . , ( ) .
t ( t ). - , τ - . P(t) 0 t
(3.1)
Ρ { τ > t } - , . Ρ(t) t. .
, (3.1)
P (t) = Ρ { (t1) < (t 1) < (t 1)}; 0 < t 1£ t, (3.2)
(t 1) (t 1)- ( , , ). , [14].
P (t) F (t) f (t) :
F (t) = 1 - P (t); f (t) = dF (t) / dt = - dP (t) / dt. (3.3)
Q (t), , , :
Q (t) = 1 - P (t) = F (t). (3.4)
(3.3) (3.4) :
(3.5)
. (3.6)
f (t) , . f ( ) t 3.1.
, , . 0 t 1 . , , - . t 1 t 2 , , . t 2 t 3 - , ( ). t 3 - . , , , . , ( - , - .), , , ( - ) [3].
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P (t), Q (t) f (t) 0 t :
P (t) =1 - n (t) / N, (3.7)
Q (t) = n (t) / N, (3.8)
f (t) = n (∆t) / (N×∆t), (3.9)
N , (); ∆t - (); n (∆t) - , () t - ∆t / 2 t + ∆t / 2; n (t) - , 0 t.
N [10, 14].