# Missing peak in a peak/real/calculated custom fields

in Informatics

I have the following CF:

Peak/Real(0.0)/Calculated

Calculation Criteria:

- Search Order: Result Set Only

- Sample Type: Standards And Controls

- Peak Type: Founds Only

Calculated Field Formula: P.%.SAME.%RSD(Area)

I have 6 injections of standard and 1 injection of control.

Let´s say that I get no peak in the control because of an analytical issue. Is is possible to be detected by the cf? Will the cf work even if 1 peak is missing?

If not, how can I solve it?

Thanks

Peak/Real(0.0)/Calculated

Calculation Criteria:

- Search Order: Result Set Only

- Sample Type: Standards And Controls

- Peak Type: Founds Only

Calculated Field Formula: P.%.SAME.%RSD(Area)

I have 6 injections of standard and 1 injection of control.

Let´s say that I get no peak in the control because of an analytical issue. Is is possible to be detected by the cf? Will the cf work even if 1 peak is missing?

If not, how can I solve it?

Thanks

0

## Answers

If you tick Missing Peak, the value will still be based on the 6 injections but this value will also be present for the component in the control injection when you select it- in other words, if the answer is 2.678, this value will be seen for the CF for all injections, it wont be blank in the control injection.

If you want to use a certain value for missing peaks you can use the REPLACE function, which also requires the Missing Peak ticked.if you wanted to replace a missing peak with 0, your formula changes to P.%.SAME.%RSD(REPLACE(Area,0)) but be aware your value will be affected if you have a set of values with 0 amongst them- the final %RSD will be very large.