This article is from the Table Tennis (Ping Pong) FAQ, by ttennis@bu.edu with numerous contributions by others.
The Rating Committee or its chairman will make all seedings and
placements for mandatory events in the U.S. Open and U.S. Closed
Championships, for all singles events in three-star tournaments, and
at cost to any other tournament when requested by the tournament
sponsor or the E.C.
Ratings will be calculated for all USATT members who, within the
previous 12 months, have a tournament record that includes matches
against opponents near their playing ability.
5.3.1 Estimated ratings for players not eligible under By-Law5.3 will
be established by either a Match Equilibrium or a Score Equilibrium
method.
5.3.1.1Match Equilibrium Method -Initial ratings are calculated from
the win-loss record against several opponents.
5.3.1.2Score Equilibrium Method -An initial rating is made by this
method when the player's record in tournament play consists of nearly
all wins or nearly all losses. An estimated rating is calculated from
the relative point scores against opponents of known ratings.
5.3.2 Matches Used for Ratings
All reported singles matches in sanctioned tournaments will be used.
5.3.2.1Standing Rule: Club or league matches may be used at fees
stated in the Fee Schedule.
 
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