Computes numbers at risk, numbers of events at each unique event time within levels of a blocking factor
1 
formula 
Should be a formula of the form 
data 
a dataframe 
subset 
you can subset the analysis via logical expression in variables in the dataframe 
na.action 
pass a method for handling 
A dataframe of 2*NLEV + 1
columns where NLEV
is the
number of levels of the factor block
.
time 
The sorted vector of unique event times from all blocks 
nrisk1 
The number at risk in block level 1 at each event time 
nevent1 
The number of events in block level 1 at each event time 
... 

nriskNLEV 
The number at risk in block level NLEV at each event time 
neventNLEV 
The number of events in block level NLEV at each event time 
Grant Izmirlian <izmirlian@nih.gov>
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