Alright, here's my attempt at the first one:

sub findProb {
    my( $word ) = @_;

    $g = 2*$good{$word} || 0;
    $b = $bad{word} || 0;

    if( ($g+$b) < 5 ) {
        return( $g + $b );
    } else {
        $num   = min( 1, $b/$nbad );
        $denom = min( 1, $g/$ngood ) + min( 1, $b/$nbad );
        return( max( .01, min( .99, $num/$denom ) ) );
    }
}
[download]

Any comments?

-- Dave

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