BI Ratio

The Brush to Invite ratio is a social ratio that measures the quality and "blokeness" of a particular friend. It uses the number of invites issued to said friend which is used to divide by the number of times said friend has not exercised attendance at the event (i.e. "brushed" the event) It is expressed as follows:
\mbox(Brush to Invite ratio) = \frac (\mbox{Number of Brushes)) (\mbox{Number of Invites))
For example, if "Fred" is issued five (5) invites to a social event and decides not to attend four (4) of these, then his brush to invite ratio would be four (4) divided by five (5), which equals 0.80. It means that for every five invites that "Fred" is sent, he will only attend one (1) of these. A brush to invite ratio of less than 0.20 is usually considered to be acceptable (i.e., you make the effort to attend the majority of social events).
The brush to invite ratio is an indication of several qualities of a friend or mate (see "mateship"); such as strength of "wingman" attributes, commitment to mates and mates' causes, the ability to assist with and self-release built up stress via enjoying an alcoholic beverage with friends.
Acceptable brush to invite ratios vary from culture to culture, however it is widely accepted that Australian men have the lowest occurrences of brush to invite ratios (reference needed) in the world. If a man's brush to invite ratio are less than 0.20, then he is generally considered to be a "good friend". If the ratio is near to or equal to 1.00, it may be caused by several factors, the main being an incorrect setting of order of priorities, i.e. prioritising the stay at home with his wife/partner above that of enjoying a social time with old friends. In other words a ratio near or equal to one (1) means the gent in question is not a "good mate".
Recent application of the brush to invite ratio has raised several requests for exceptions to the ratio, in an attempt to cancel out numbers of brushes against invites, hence preserving a good BI ratio score.
In fact, certain practitioners of the BI ratio have highlighted the importance of a good BI ratio score by disregarding key barriers to entry for social events, such as financial solvency, in order to ensure their ratio remains as low as possible.

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