___________________________________________________________________
 |                                                                 |
 |                      ID .ID. AND L1 DATA ITEMS                  |
 |_________________________________________________________________|

 MEANING: Identification (ID) data item for NONMEM
 CONTEXT: $INPUT record and NONMEM data set

 USAGE:
 $INPUT ... ID ...

 DISCUSSION:
 ID, .ID. and L1 are labels for NONMEM's identification data item.

 ID
      The observations in the data set are divided into  groups  called
      level-one  observations.   These groups may have different sizes.
      Level-one  observations  are  treated  as   being   statistically
      independent multivariate observations.

      Because there can be at most one scalar observation on  any  data
      record,  the  identification  (ID)  data  item  is  used to group
      together the data  records  containing  the  scalar  observations
      comprising a level-one observation.  Using NM-TRAN, the identifi-
      cation data item is given the label ID in the $INPUT  record.   A
      contiguous set of data records with the same value of ID are col-
      lectively called an individual record (also called an L1 record),
      and  this  record "contains" one level-one observation.  A change
      in ID value indicates the start of a new individual record.

      When every level-one observation  consists  of  a  single  scalar
      observation, so that the entire level-one observation can be con-
      tained in a single data record, ID data items are  not  generally
      required.  However,  they  are  always required when the data are
      population data and PREDPP is used.

 .ID.
      When the data are single-subject data and PREDPP is used, NM-TRAN
      automatically  generates the ID data items and provides the label
      .ID. for the NONMEM control stream.  (Or if L2 data items appear,
      these  are  taken  to  be the ID data items.)  If the ID label is
      given in the $INPUT record,  NM-TRAN  ignores  it,  and  it  also
      ignores the data items associated with this label.

 L1
      Using NM-TRAN, the identification data  item  may  be  given  the
      label  L1  in the $INPUT record.  Use of L1 as a label or synonym
      (e.g. ID=L1) in the $INPUT record specifies that  the  associated
      data  items  are to be used as the identification data items and,
      if the data are single-subject data, the automatic generation  of
      the identification data items is suppressed.

REFERENCES: Guide I Section B.1
REFERENCES: Guide IV Section II.C.4, III.B.2


  
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