| isInitialized | R Documentation | 
Checks if object has been initialized (generally through a call
to Initialize), by searching for components and attributes
which are modified during initialization.
isInitialized(object)
| object | any object requiring initialization. | 
a logical value indicating whether object has been
initialized. 
José Pinheiro and Douglas Bates
Initialize
pd1 <- pdDiag(~age)
isInitialized(pd1)
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