FF function

Create any firm-firm (FF) matrix

General function to create a firm-firm (FF) matrix

FF(..., who, ties, id_as_firm_name = NULL, Matrix = NULL, self_ties = FALSE)

Arguments

• ...: Either multiple objects of class firm or a list of such objects
• who: Whether to take into account: (ownership) co-ownership ; (management) board interlocks, or both (recognises minimum unambiguous strings).
• ties: Type of ties to create. Possible values: binary; naive; share (see Details).
• id_as_firm_name: Whether to use the ticker as the firm's name. Defaults to TRUE if all firms' id is neither NULL nor NA.
• Matrix: Whether to use the c("list("Matrix")", " package"). Defaults to TRUE when any matrix in the pipeline contains more than 10,000 cells and the package is installed.
• self_ties: Whether to allow self-ties (a 'loop' in graph theory). Defaults to FALSE.

Returns

A matrix object of class financial_matrix(possibly using the c("list("Matrix")", " package"))

Details

See more specific functions for a detailed overview:

for board interlocks (who == 'management'):

• FF.binary.management, if ties = 'binary';
• FF.binary.management, if ties = 'naive';
• FF.norm.management, if ties = 'share'.

for co-ownership (who == 'ownership'):

• FF.binary.ownership, if ties = 'binary';
• FF.naive.ownership, if ties = 'naive';
• FF.norm.ownership, if ties = 'share'.

for both co-ownership and board interlocks (who == 'both'):

• FF.binary.both, if ties = 'binary';
• FF.naive.both, if ties = 'naive';
• FF.norm.both, if ties = 'share'.

Examples

# Create the normalised FF matrix of Berkshire Hathaway's holdings by boards interlocks
data('firms_BKB')
FF <- FF(firms_BKB, who = 'man', ties = 'share')

See Also

Other Financial_matrix builders: FF.binary.both(), FF.binary.management(), FF.binary.ownership(), FF.naive.both(), FF.naive.management(), FF.naive.ownership(), FF.norm.both(), FF.norm.management(), FF.norm.ownership()

Author(s)