Probe group comparison methods

eArray can compare two probe groups based on either probe sequences or probe names. You select one of four methods of comparison, and eArray returns a list of probes that satisfy the criteria of the selected method. You can create a probe group from this list of probes. The table below describes the four methods of comparison, as applied to two probe groups A and B.

Method	Diagram	Description
Probes common to both groups		The resultant set contains probes that are common to both probe groups. Use this type of comparison when you want to determine the overall and specific similarities between two probe groups.
Probes from both groups		The resultant set contains a non-redundant set of all probes. That is, all probes are included from both groups with any duplicates removed.
Probes from first group only		The resultant set contains probes that are contained only in probe group A and not in B.
Probes from second group only		The resultant set contains probes that are contained only in probe group B and not in A.

Note: Probe group comparisons are not available for High Density (HD) or microRNA probe groups.