This function gives the cumulative total of the values ( in level or percentage form ).
This function gives the cumulative total of the values.
z is the zoo object returned from phys2eventtime.
is.pc is a logical flag to indicate that the values are in percentage form.
base for the cumulative sum (default: base = 0).
The frame returned has each column replaced by the cumulative sum of the column.
eventDays, eventstudyData, phys2eventtime
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