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. 2014 Jun 20;52(6):3812–3823. doi: 10.1007/s13197-014-1446-z

Table 3.

Central composite design matrixes with independent variables in coded and actual values, and observed and predicted values of response variable (% demineralization) in the demineralization of wet and dry shrimp byproducts materials. X1, concentration of HCl solution (%, w/v) and X3, solid liquid ratio of HCl solution (w/v)

Run Independent variables Response variable
X1 (%, v/v) X3 (w/v) Demineralization (%, w/w)
Wet Dry
Ca Ab Ac Ca Ab Ac Observed Predicted Observed Predicted
1 −1 1 1 −1 2 2 7.9 −0.8 3.5 7.9
2 −1 1 1 +1 6 7 45.9 37.6 1.3 −0.5
3 +1 4 5 −1 2 2 75.3 67.1 12.9 12.9
4 +1 4 5 +1 6 7 98.4 90.5 98.5 90.1
5 −1.41 0.38 0.17 0 4 5 12.8 21.3 0.0 −2.5
6 +1.41 4.62 5.82 0 4 5 98.8 106.7 71.8 77.1
7 0 2.5 3 −1.41 1.17 1.46 2.8 11.4 3.6 −1.2
8 0 2.5 3 +1.41 6.83 8.53 47.1 55.1 46.5 51.3
9 0 2.5 3 0 4 5 32.1 22.4 17.0 18.4
10 0 2.5 3 0 4 5 16.0 22.4 15.7 18.4
11 0 2.5 3 0 4 5 22.5 22.4 18.7 18.4
12 0 2.5 3 0 4 5 18.9 22.4 19.4 18.4

a = coded; b = actual for dry shrimp shell material, c = actual for wet shrimp shell material