Determining game performance statistics without revealing specific gaming meter data

A method for determining relative performance data of a gaming machine, comprising:

• receiving a relative performance value determined by confidential delta meter data and confidential gross meter data;
• transforming the relative performance value to a transformed performance value, wherein the transformed performance value is determined by multiplying the relative performance value with a previous transformed performance value;
• and
• plotting the transformed performance value on a performance graph.

Logic encoded in one or more tangible media for execution and when executed operable to:

• receive a relative performance value determined by confidential delta meter data and confidential gross meter data;
• transform the performance value to a transformed performance value, wherein the transformed performance value is determined by multiplying the relative performance value with a previous transformed performance value;
• and
• compile the transformed performance value in a database.