buildQuasiObs: Expand discrete time survival data into quasi observations.
In WinVector/QSurvival: Quick survival models by data transformation

Description Usage Arguments

This function assumes time starts at 1 and counts unit increments.

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buildQuasiObs(d, observationWindowWidth, numberOfObservations, eventIndex,
  idColumnName, indexColumnName, eventColumnName, parallelCluster = NULL,
  targetSize = NA, forceEvent = FALSE, weightsColumnName = NULL)

`d`	data.frame to expand
`observationWindowWidth`	scalar, minimum step number to expand to
`numberOfObservations`	vector (entries >=1) for each row of d up to what step number did we observe
`eventIndex`	vector for each row of d at what time did event occur. Event i is considered censored if eventIndex[[i]] is NA or out of range of 1:numberOfObservations.
`idColumnName`	character scalar, column to write original row ids in
`indexColumnName`	character scalar, column to write quasi event indices into
`eventColumnName`	character scalar, column to write quasi events indicator into. If NA, write no such column.
`parallelCluster,`	if not NULL parallel cluster to perform the work.
`targetSize`	numeric scalar, if not NA target size for a uniform sample of the quasi observations.
`forceEvent`	logical scalar, if true force conversion events into sample
`weightsColumnName`	if not NULL column to write sampling weights in