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Empower Custom Field help
Posted: Tue Jan 07, 2014 6:26 pm
by 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
Re: Empower Custom Field help
Posted: Wed Jan 08, 2014 3:14 pm
by MakoBrad
The inter sample calculations must not be used by many people in the industry. This is our only instance.
Re: Empower Custom Field help
Posted: Wed Jan 15, 2014 12:41 pm
by 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.
Re: Empower Custom Field help
Posted: Sun Mar 09, 2014 11:42 am
by 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