if ($REP < $NORM) { $ODDS++ == 1/3; $ODDS-- == 1/3; } elsif ($NORM <= $REP < (2 * $NORM)) { $ODDS++ == 1/2; $ODDS-- == 1/3; } elsif ((2 * $NORM) <= $REP < (3 * $NORM)) { $ODDS++ == 2/3; $ODDS-- == 1/3; } elsif ((3 * $NORM) <= $REP < (4 * $NORM)) { $ODDS++ == 3/4; $ODDS-- == 1/4; } else { $ODDS++ = 1; $ODDS-- = 0; }