Sorority Preferential Bidding System

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Sorority Preferential Bidding System

Post  KatieBradford on Sun May 31, 2009 3:15 am

This article talks about the Preferentail Bidding Alogrithm used to match sororities and the girls who rush for them. When talking about matching and preferences it reminded me of the process of filling out cards for each stage of the sorority rush process. The way in which the process happens is described in this excerpt:
Table 1--Sorority Rushing Instructions:

The Preferential-Bidding System Algorithm


Bid Lists

1. At a specified time, each fraternity files with the Panhellenic Executive a list of women it wishes to bid.

a. Lists are in duplicate; one copy is used in bid matching, the other is returned to the chapter when the bid matching is completed.

b. The fraternity bid list should be on paper ruled into three columns:

Left hand column- List in alphabetical order of fraternity's first choices up to the limit of quota.

Right hand column- List in order of preference the fraternity's additional choices which may number as many as the chapter wishes to submit.

Center column- Is left blank, as this is the column in which the matched bids are entered.

As a bid is matched, the rushee's name is crossed off every fraternity's first or second list. Her name is entered in the center column of the fraternity list of the group to which she is being pledged.

2. Along with its bid lists, each fraternity brings to Panhellenic enough formal bids (in envelopes) for each woman to be pledged. These formal bids are to be addressed after bid matching is completed.

Procedure for Matching Bids

1. Persons matching bids include the Reader, the Tabulator, and one alumnae handling the bid list from her fraternity. Undergraduates are not to participate in bid matching.

2. Before bid matching begins, names of all rushees who chose not to sign a preference card should be crossed off all preference lists, and those lists adjusted to fill the space of these women.

3. Mechanics:

a. After alphabetizing the preference cards, the reader calls the rushee's name and her first choice. If the fraternity of her first choice has given her a bid on its first bid list, it is a matched bid, and all others should cross her from their list. If the rushee's name is not on the fraternity's first bid list, her preference card is temporarily laid aside. Names of rushees who list only one preference and are unmatched at the end of the first reading should be crossed off all other bid lists and their cards laid aside.

b. Each time a name is crossed off a fraternity's first bid list, if openings in the fraternity's pledge quota remain, a name from the fraternity's second bid list is added, in the listed order, to the bottom of the unmatched names remaining on the first list. The number of unmatched names on the adjusted first bid list and the number of those pledged must always equal quota (unless a chapter has run out of names to add from its second bid list.)

c. The cards laid aside in step "a" are read again according to the first choice of the rushee. This process is repeated as long as there is any possibility of the rushee receiving a bid from the fraternity of her first choice.

d. Those cards remaining are those of rushees whose names are on the second bid list of the fraternities of their first choice.

e. When it becomes apparent a rushee will not receive a bid from the fraternity of her first choice, a rushee's second choice is then matched, if possible, in the above manner.

f. Any remaining cards are then read according to the rushee's third choice and the same procedure followed.

g. The tabulator reads the results and all bid lists are reviewed for accuracy.

h. Unmatched bids - If a rushee's preference card has failed to match for a bid, the Panhellenic Executive may contact the rushee and ask if she will accept a bid from a fraternity not previously listed among her choices, if this other fraternity has her name on one of their bid lists. Any rushee not bid by any of her preference choices is eligible at any future time for rushing and pledging by any fraternity.

Unfilled Quotas - If a fraternity has failed to fill its quota through this bid matching in formal rush, it may be contacted by the Panhellenic Executive to ask if the fraternity wishes to extend a bid to anyone not originally on its bid lists.

This process reminds me in part of the way in which preferences are made in the relationship market algorithm. How people are crossed off especially. Its also interesting how complex the process is to attempt to get the result for large numbers of girls and several organizations. Thinking about market applications to situations such as this (as opposed to obvious markets that involve money exchange) are interesting. I believe a bipartite graph could be used to represent this situation, although it would definitely be large and confusing. Also, the article seems to imply in the end that although the system has initially stable results, in the larger framework they are not stable. I'm not entirely sure about the logic behind this but it is somewhat interesting. Perhaps because the girls if not placed in their first choice are not placed in their second choice spot (if open) until their first becomes available, but rather unplaced until later. It still seems like a fairly effective market-type system for placing rushees in their respective sorority houses.


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Join date : 2009-04-13

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Re: Sorority Preferential Bidding System

Post  Kristina Youmaran on Sun May 31, 2009 2:56 pm

First off, very interesting article on the sorority bid process. According to the article I found above, some fraternities are also using this process to help out smaller houses that would otherwise not have quality men attracted to them. I think it's interesting to compare both rush processes, especially here on campus. No matter how "unpopular" or "undesirable" the sorority is, they typically still have many members, whereas an unpopular or not well known fraternity barely survives because either they don't have a good rep or no one knows about them. The bid process above would help with them out.

Personally, I don't see all fraternities switching to this process, especially here.

Kristina Youmaran

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Fraternities Adopting a Panhellenic View of Rush

Post  wizeguy on Sun May 31, 2009 4:47 pm

I do believe that fraternities that NU could greatly benefit by adopting some aspects of the Sorority Rush process. At the end of the sorority rush process, the girls have only one bid to a sorority. Sometimes it is the sorority they wanted and sometimes it isn't. But the process works to a point because every girl that wants to rush a sorority is exposed to every house and makes an informed decision of where she would like to end up.

However, for fraternity rushing, rush week is essentially just for show. Most fraternities already know who they are going to give bids to in Fall Quarter. But fraternities could greatly benefit by having open houses for freshmen so that the freshmen can look at each house before making any type of decision. Some guys go to one house in the beginning of Fall Quarter and never go anywhere else, and for this reason they could be missing out on what another fraternity may have to offer. With the current system, freshmen looking for a fraternity are kind of like the market for lemons, as they are making decisions based on incomplete information, and do not necessarily know if the fraternity they are primarily looking at is a lemon because they have nothing to compare to.


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Re: Sorority Preferential Bidding System

Post  Tod Reynolds on Mon Jun 01, 2009 10:12 am

Sororiety/Fraternity recruitment is a hilarious process whose optimal stratagy could be debated till the end of time.

At the most stereotypical levels, fraternity recruitment at NU is all about finding the best guys for your house, while sororiety recruitment is about being the farest to everyone.

In fraternity recruitment freshman that are interested in joining the house go and meet with brothers at only the houses that they have a intrest in. Houses discuss members that they are interested in, and once they reach a number of bids that matches the number of guys are looking to accept they stop searching. Freshman are then given the opportunity to choose between all of the houses that asked them to join. This is the optimal solution for multiple reasons. 1) cost: freshman only have to go to houses that they are interested in, and Houses only need to entertain guys they are interested in. 2) retention rate: Because when joining a frat it is the new members that have the final say as to weather they stay. In the sororiety process while the new members provide input, it really is the house that has the final say. This leads to signifigantly higher drop out rates in sororieties than fraternaties.

Tod Reynolds

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