Kendall tau rank correlations for all pairs of data series
pair	tau	p-value
tau( werklh , ecogr )	-0.178710969420873	0.0481430160069507
tau( werklh , inflatie )	-0.0339991506382491	0.710323228691191
tau( ecogr , inflatie )	0.103704615316701	0.247656912760176