Stipulates alpha spending according to the Pocock
spending function in the Lan-Demets boundary construction method. Its
intended purpose is in constructing calls to
An object of class
Gives the spending function type, which is the character string "Pocock"
returns the call
The print method returns the call by default
see references under
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## example 1: what is the result of calling a spending function ## A call to 'Pocock' just returns the call Pocock() ## but really its value is a list with a component named ## 'type' equal to "Pocock" and a component named ## 'call' equal to the call. names(Pocock) Pocock()$type Pocock()$call ## example 2: ...But the intended purpose of the spending functions its ## intended purpose is in constructing calls to 'GrpSeqBnds' and to 'PwrGSD': frac <- c(0.07614902,0.1135391,0.168252,0.2336901,0.3186155, 0.4164776,0.5352199,0.670739,0.8246061,1) drift <- c(0.3836636,0.5117394,0.6918584,0.8657705,1.091984, 1.311094,1.538582,1.818346,2.081775,2.345386) test <- GrpSeqBnds(frac=frac, EfficacyBoundary=LanDemets(alpha=0.05, spending=Pocock), FutilityBoundary=LanDemets(alpha=0.10, spending=ObrienFleming), drift=drift)
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