xsect | R Documentation |

Given a dataset in long format, for instance generated by
`msprep`

, this function takes a cross-section at a given time
point, to list the subjects under observation (at risk) at that time point
and the states currently occupied.

```
xsect(msdata, xtime = 0)
```

`msdata` |
An object of class |

`xtime` |
The time point at which the intersection is to be made |

It is possible that subjects have moved to one of the absorbing states prior
to `xtime`

; this is NOT taken into account. The function `xsect`

only concerns subjects currently (at `time`

) at risk.

A list containing `idstate`

, a data frame containing
`id`

's and `state`

, the number of the state currently occupied;
`atrisk`

, the number at risk, and `prop`

, a table counting how
many of those at risk occupy which state.

Hein Putter H.Putter@lumc.nl

```
tmat <- trans.illdeath(names=c("Tx","PR","RelDeath"))
data(ebmt3) # data from Section 4 of Putter, Fiocco & Geskus (2007)
msebmt <- msprep(time=c(NA,"prtime","rfstime"),status=c(NA,"prstat","rfsstat"),
data=ebmt3,trans=tmat)
# At the start everyone is in state 1 (default xtime=0 is used)
xsect(msebmt)
# At 5 years
xsect(msebmt, xtime=1826)
```

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