my $da = DataAnalyzer->new();
$da->connect_to_db->($dsn);
my $result_set = $da->run_analysis( %parameters_for_analysis );

##</code><code>##

my $da = DataAnalyzer->new( $dsn );
my $result_set = $da->run_analysis( %parameters_for_analysis );

##</code><code>##

my $result_set = DataAnalyzer->new( $dsn, \%parameters_for_analysis  );