Empower Custom Field help

[MakoBrad]

can any one help with this one...I have not had much luck doing inter sample/std calcs

Absolute Percent Relative Error

A1-A2/(A1+A2/2) x 100


A1 Peak Area of first std
A2 Peak Area of second std

thanks in advance

Brad

[MakoBrad]

The inter sample calculations must not be used by many people in the industry. This is our only instance.

[shaun78]

Use sample labels in your sample set method.

A1 = SS1
A2 = SS2

Formula: ((SS1.%.%.AVE(Area) - SS2.%.%.AVE(Area))/((SS1.%.%.AVE(Area)+SS2.%.%.AVE(Area))/2))*100

End your sample set methods with a Summarize Custom Fields function.

Replace Area with what ever parameter you are looking to use. I somewhat erroneously assumed you would use peak areas...

If there are not multiple injections, then I believe you can also drop the AVE from the equation.

For samples, given the number of samples, you might be best using an enumerated custom field as a function to calculate results.

[kagliostro]

Hi to everyone,
this formula would be perfect for me if you can help to rearrange it for me since I am new to Empower.
Alla I wanna do is to calculate the percent difference between the calculated amount of single injection and the amount value obtained as average of 10 injections. The final result would be a column next to the sample amount calculated by empower which says +0.2% or -0.3% with respect to the averaged amount.
How can I setup this custom field? which formula shall I use.

this the link related the result I wanna achieve
http://imagebin.org/298059

Thx a lot for your help