Quantification of Uncertainty in Mathematical Models: The Statistical Relationship between Field and Laboratory pH Measurements

Table 4

Model parameters for the sigmoidal model of field pH against lab pH with least squares and Pearson index fit for the quantised and randomised data.

Model fit	Quantised		Randomised
	Least squares	Pearson index	Least squares	Pearson index
r^2	0.791	0.788	0.781	0.778
	2946	2905	2786	2739
p	<0.00001	<0.00001	<0.00001	<0.00001
Fit s.e.	0.620	0.623	0.635	0.638
a	4.737	4.750	4.760	4.806
b	4.639	4.735	4.655	4.686
c	7.143	7.233	7.185	7.277
d	0.948	0.919	0.962	0.905