Peak Matching

This operation matches one or more Peak List elements, following the workflow presented bellow.

Usage

You can execute this operation by clicking the button or following the menu Preprocess/Align Peak Lists.

A dialog will appear allowing you to select the following options:

• Peak Lists to match: previously loaded Peak Lists. You can choose between Labeled or Unlabeled Peak Lists.
• Intra-sample matching method (optional): None (not apply), the Forward algorithm or MALDIquant.
  If you choose the Forward algorithm, you also have to set:
  • Tolerance type: PPM (Points per million), Absolute or Relative. Default is PPM.
  • Tolerance value: tolerance used together with the tolerance type to consider two peaks the same. Default is 300.
  • Reference type: First, Median, Last, Average, Average up or Average down. Default is Average (AVG).
  If you choose MALDIquant, you also have to set:
  • Tolerance value: tolerance used to consider two peaks the same. Default is 0.002.
  You can also set here if you want to generate a consensus spectrum for each sample and the Percentage of Presence (POP) value to controll this process.
  
• Inter-sample matching method: Forward algorithm or MALDIquant.
  If you choose the Forward algorithm, you also have to set:
  • Tolerance type: PPM (Points per million), Absolute or Relative. Default is PPM.
  • Tolerance value: tolerance used together with the tolerance type to consider two peaks the same. Default is 300.
  • Reference type: First, Median, Last, Average, Average up or Average down. Default is Average (AVG).
  If you choose MALDIquant, you also have to set:
  • Tolerance value: tolerance used to consider two peaks the same. Default is 0.002.



Align Peak Lists dialog