Beni-Suef University Journal of Basic and Applied Sciences

Table 6 A 3² factorial design experimental layout

From: Factorial design approach to fabricate and optimize floating tablets based on combination of natural polymer and rice bran wax

Formulation code	Guar Gum (X1)* (mg)	RBW (X2)* (mg)
F1	20 (− 1)	25 (+ 1)
F2	30 (+ 1)	20 (0)
F3	20 (− 1)	20 (0)
F4	20 (− 1)	15 (− 1)
F5	30 (+ 1)	15 (− 1)
F6	25 (0)	15 (− 1)
F7	25 (0)	25 (+ 1)
F8	30 (+ 1)	25 (+ 1)
F9	25 (0)	20 (0)

*X1 and X2 represent the main effects (factors); (+ 1): higher value, (0): intermediate value and (− 1): lower value. Actual values for X1: 30 (+ 1), 25 (0) and 20 (− 1); actual values for X2:25 (+ 1), 20 (0) and 15 (− 1)

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