The procedure starts by building a one variable regression model using the variable that has the highest correlation with the response variable y.
The effects of time, sample:ethanol ratio, pH and temperature on salt extraction by ethanol addition were assessed by a one-variable-at-a-time approach and then by performing a 32 fractional factorial design.
In that case, the budget constraint (equation (4)) can be replaced by an equality: (4a) Isolating n s or n d from equation (4a), followed by substitution into equation (3), yields a one-variable objective function,, with i = s or i = d.
The conventional method of studying a process by changing one variable at a time and keeping the other variables at a constant level does not depict the combined effect of all the factors involved.
In the most cases, the evaluation of the photo degradation was carried out by a traditional method (one variable at a time), which is not only costly and time consuming but also often leads to misinterpretation of Experimental results [13 19].
We also sought a simpler measure of spider CV by: (a) calculating only one variable out of the seven and using it as a surrogate for the multi-criteria CV measurement; by (b) calculating this variable only for a short time period or (c) for only one spider family.
The effect of SA loading (5 20%), pressure (2.8 5.8 barg) and temperature (353 383 K) on ODDA yield was studied by varying one variable at a time.
A backward elimination procedure was used by removing one variable at a time with highest P-value until only variables with a P-value below 0.5 were left in the model.
We subsequently explored the variables included in the initial model by adding one variable at a time to a new model and evaluated the behavior of the Bayesian information criteria (BIC) of all models created in this way.
The chapter also describes that a linear combination consists of the sum of a constant multiplied by one variable and another constant multiplied by the other variable.
However, the relationships have been studied by changing one variable at a time.
