INPUT VARIABLES:

  lread      Number of system buffer reads per second
  lwrite     Number of system buffer writes per second
  scall      Number of system calls per second
  sread      Number of system call reads per second
  swrite     Number of system call writes per second
  fork       Number of system call forks per second
  exec       Number of system call execs per second
  rchar      Number of characters transferred by sys reads
  wchar      Number of characters transferred by sys writes
  pgout      Page-out requests per second
  ppgout     Pages paged out per second
  pgfree     Pages freed per second
  pgscan     Pages scanned for freeing per second
  atch       Page faults/sec satisfied by attaches
  pgin       Page in requests per second
  ppgin      Pages paged in per second
  pflt       "Copy-on-write" page faults
  vflt       Page faults caused by pages not in memory
  runqsz     Process run queue size
  freemem    Number of free memory pages
  freeswap   Free disk swap blocks


OUTPUT VARIABLE TO BE PREDICTED:

  usr        % CPU utilization (user)