Plackett–Burman design was used to screen of the important
medium components with respect to their main effects and not the
interaction effects between various medium constituents (Plackett
and Burman, 1944). Including date juice, a total of fifteen components
[variables, k = 15] were selected for the study with each
variable represented at two levels, high concentration (+) and low
concentration (−) and four dummy variables in 20 trials as shown
in Table 5. The number of positive signs and negative signs per
trial are (k + 1)/2 and (k − 1)/2, respectively. Each column should
contain equal number of positive and negative signs. Thus, each
row represents a trial run and each column represents an independent
(assigned) or dummy (unassigned) variable
Plackett–Burman design was used to screen of the importantmedium components with respect to their main effects and not theinteraction effects between various medium constituents (Plackettand Burman, 1944). Including date juice, a total of fifteen components[variables, k = 15] were selected for the study with eachvariable represented at two levels, high concentration (+) and lowconcentration (−) and four dummy variables in 20 trials as shownin Table 5. The number of positive signs and negative signs pertrial are (k + 1)/2 and (k − 1)/2, respectively. Each column shouldcontain equal number of positive and negative signs. Thus, eachrow represents a trial run and each column represents an independent(assigned) or dummy (unassigned) variable
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