# I need a custom field equation in Empower 3

Hello

I want a custom field equation to calculate % amount:

% amount= (AREA OF STANDARDS / AREA OF UNKNOWN SAMPLES) * 100

Note:

1- I inject 6 standards in the beginning of the sequence then 3 unknown samples and I want to calculate the % amount in the unknown samples

2- so I want to take the average area of this 6 standards, then when I open each unknown samples I will need to know" % amount "

so, please help

I want a custom field equation to calculate % amount:

% amount= (AREA OF STANDARDS / AREA OF UNKNOWN SAMPLES) * 100

Note:

1- I inject 6 standards in the beginning of the sequence then 3 unknown samples and I want to calculate the % amount in the unknown samples

2- so I want to take the average area of this 6 standards, then when I open each unknown samples I will need to know" % amount "

so, please help

0

## Answers

Peak, Real, Calculated custom field. Set Sample Type to All and Peak Type to All. Search Order is typically Result Set Only which means you process a sample set to generate a result set. You will need to label all your standards so for example put the label of S1 or S0101 against the 6 injections of standards. Then your formula becomes:

(Area*100)/(S%.%..AVE(Area))

Then when you click down through your 3 unknowns it should take the area of each component in the unknown and divide it by the average of the component area in the 6 standards.

If you want to exclude it calculating for the standards (ie you hardly want the Area of the standard/Average area of 6 standards) then throw in a Bool condition at the start of the formula:

EQ(Sample Type,"Unknown")*(Area*100)/(S%.%..AVE(Area))