Effect of Temperature and Duration Time of Maceration on Nitrate Content of Vernonia cinerea (L.) Less.: Circumscribed Central Composite Design and Method Validation

Table 3

Predicted values, experimental values, and percent error of the prediction.

Responses	Predicted value	Experimental value	Error (%)
Yield of the extraction (%)	17.2	15.5±0.14	-10.97
Nitrate content (%)	0.610	0.610±0.001	0.00

%Error = (experimental value – predicted value)/experimental value × 100.