sub _select_fields
    {
        my $self = shift;
        my @fields;

        if ($self->request->param('rev_type') eq 'both') {
            push @fields, ('rev', 'theater_avg');
        } elsif ($self->request->param('rev_type') eq 'total') {
            push @fields, 'rev';
        } else {
            push @fields, 'theater_avg';
        }

        push @fields, 'num_theaters', 'day_multiple';
        return @fields;
    }