So you want to read in all the data for one timestamp, calculate the min, avg, max, and note the errorcode(s), and output the one-line summary, right? Something like (formerly untested but now updated and tested thanks to comments from Limbic~Region): 
my $current_ts = '';
my $rowcount = 0;
my ($min, $max, $sum, %ec);
while (<>) {
  chomp;
  my ($ts, $v, $e) = split;
  if ($current_ts ne $ts) {
    if ($current_ts eq '') { $current_ts = $ts }
    else                   { &output_summary   }
    $current_ts = $ts;
    ($min, $max, $sum) = ($v, $v, $v);
    %ec = ($e, 1);
    $rowcount = 1;
  }
  else {
    $min = $v if ($v < $min);
    $max = $v if ($v > $max);
    $sum += $v;
    ++$rowcount;
    ++$ec{$e};
  }
}
&output_summary;

sub output_summary {
  printf "%s\t%g\t%g\t%g\t%s\n", $current_ts, $min, $max, $sum/$rowcou
+nt, join(',', keys %ec);
}

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In reply to Re: rearrange data to min, avg, max by Roy Johnson
in thread rearrange data to min, avg, max by Earindil

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