Table 5.

Correlations between HDI and measurement challenges. Depicted are Spearman rank correlations and the level of significance

HDI Value	Measurement challenges		DO	EC	pH	TP	TN
	Monitoring	Technical equipment	− .392**	− .335*	− .311*	− .467**	− .570**
		Human skills	− .326*	− .288*	− .188*	− .354**	− .389**
		Financial means	− .434**	− .419**	− .463**	− .501**	− .495**
	Analytics	Technical equipment	− .566**	− .460**	− .405**	− .578**	− .591**
		Human skills	− .404**	− .369**	− .187	− .355**	− .369**
		Financial means	− .394**	− .498**	− .468**	− .498**	− .442**
	Data handling/analysis	Technical equipment	− .388**	− .430**	− .384**	− .483**	− .511**
		Human skills	− .222	− .361**	− .387**	− .381**	− .395**
		Financial means	− .492**	− .591**	− .471**	− .580**	− .549**
		Transferring data	− .262	− .288*	− .412**	− .458**	− .460**

^*The correlation is significant at the .05 level (two-tailed)

^**The correlation is significant at the .01 level (two-tailed)