Standard Agreement Using Peak Area Ratios Determined from Custom Calculation

Hello,

You would need to give me more details about the calculation to be sure this will work. I would do the entire calculation in CC as in the example below. In this case, I used a compound custom field to enter the conc values for the sys and check standard injections. The custom field and the peak area was used to calculate and RF value.  I then used an expression to get the average RF for the sys suit injections to use for the check standards to calculate a recovery value. You can change that CC to be a % error or other calculation.

Marty 

RF_Ratio Type-Double Scope-PeakorGroup

CurrentPeakOrGroup.GetCustomField("QC Conc") / Peak_Area

CheckVsSys Ratio Type-Double Scope-PeakorGroup

If(Sample_Type = 4, RF_ratio / CurrentSequence.AllIdentifiedPeaks.Where(function (x) x.Compound_Name = CurrentPeakOrGroup.Compound_Name).Where(function (x) x.Injection.Sample.Sample_Type= 7).Select(function(x) x.GetDoubleCC("RF_ratio")).average * 100,Double.NAN)

Hi marty,

Here's the linked CC for the processing method.

And, here's how peak area ratio (PAR) is set up in the final results report.

Let me know if you need more information.

Thanks!

Hi Marty,

The CC instructions you provided are helpful but what I'm actually trying to do is compare peak area ratios since this is an ISTD calibration method. Also, I would have five custom fields for each of the five analytes. It seems like this would complicate things a bit.

I was playing around with the current report we have. For standard agreement, a composite group is set up that is repeated on compounds (Compound_ID). I'm not sure how to implement all five custom fields (or if it even makes sense to take this approach). I can get it to work for one compound custom field.

Thanks,

Dan

Marty,

Nevermind. I modified the CC for area ratio instead of RF and it's working great now. Thanks again for your help!

Dan