Hi,

For your question,

Plackett–Burman Experimental design:  Twelve experiments representing the Plackett–Burman design have been designed to conduct the randomization step and to a correctly enable the regression analysis. Each experiment contains only either the +1 or −1 value of each variables.

Samples are listed in the following link:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4099561/table/t0005/

For Reference:

http://nopr.niscair.res.in/bitstream/123456789/3090/1/IJBT%206%284%29%20469-478.pdf

Respected sir

Thanx for your concern.

I have performed 12 run placket burman deaign fir 11 variables manualy and also calculated diffrence, effect, varience effect, standerd error and t value. I am anable to calculate confidance level and p value . I need formula for calculating this 2 values. I have not used any software for this purpose. So if you can help me out in my prblm.

If you don't have any degrees of freedom, you can't calculate p-values. You can use Pareto Charts. Another options is to look at the coded coefficients and eliminate the 2-3 variables with the smallest coefficients. That will give you the DF to get P-values. Most software companies offer free trial software. Even if you use spreadsheets, there are options to do these calculations for you. 

Thanks sir 

I will surely try but i have not used any software. all calculations done manually

half normal plots is also a method to eliminate small effects that might be considered not active. Then you have degrees of freedom  to calculate p-values of the rest. 

what is the distribution of your test statistics. It is required to find the p-value.

Can i send you my data. If you can send me your email id

As soon as some effects are considered zero, you have degrees of freedom to find the standard error and thus a t value. Without software, you have to look up P(observed t value) in a table. A t >= 2 is approx. significant at 5%

Dear Sohel, my email is [email protected]

please check your mail i have sent raw data file also attached herewith.

my contact details-

[email protected]

09822979295

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