The Group Summary page provides a listing of all groups that exist in the results set. This table is good for determining outliers and merging them with similar more popular groups. By sorting on the "# Participants Used" column you can quickly find groups that were only used by a few participants. This table has the following columns:
# Participants Used: How many participants placed cards in this group.
# Cards: The total number of all cards placed into the group..if two participants placed the same card into the same group it would be counted twice in this column.
Unique Cards: The number of only unique cards. If two participants placed the same card in the same group it would only be counted once in this column.
Agreement: The concept of Agreement comes from Donna Spencers' Card Sort Spreadsheet. Generally speaking, higher numbers represent more agreement with 1 being 100% agreement. Donna describes agreement calculation this way:
This is a measure of how much agreement there was between participant results for that category. It is a bit obscure, but very useful when you get your head around it. As an example, for the category of "content management", sixteen participants used the category of "content management". Between them, participants put 97 cards into the category (an average of 6 cards per participant) and used twelve different cards. It has an agreement number of 0.51 - a number which has little meaning in itself, but much meaning when compared to other categories.
Compare it to the category of "accessibility". Five participants used that category and between them used ten cards in total were included in it (avg of 2 per participant). Only two unique cards were used and it's agreement is 1 - every participant who created a category of accessibility put the same two (and only two) cards in it.