Estimate the parameters of a Bradley--Terry model

A one-liner to fit and extract model parameters from a BTm model Deprecated: use BradleyTerry() or BTscores() instead.

BT2(C, sort = FALSE)

Arguments

C	a square matrix of paired comparison data
sort	logical. If TRUE, sort the weights in descending order

Details

Previously a placeholder function, now remains for reference and comparison purposes.

References

Heather Turner, David Firth (2012). Bradley--Terry Models in R: The BradleyTerry2 Package. Journal of Statistical Software, 48(9), 1--21.

Bradley, R. A., & Terry, M. E. (1952). Rank analysis of incomplete block designs: I. The method of paired comparisons. Biometrika, 39(3/4), 324--345.

See also

BradleyTerry BTscores

Examples

BT2(citations)
#>         AmS        AISM         AoS        ANZS        Bern        BioJ 
#> 0.023845806 0.021878755 0.063145179 0.016872933 0.031871580 0.010675592 
#>         Bcs         Bka       Biost         CJS        CSSC        CSTM 
#> 0.037234175 0.057807368 0.030739512 0.021617392 0.004520609 0.007571317 
#>       CmpSt        CSDA         EES        Envr         ISR       JABES 
#> 0.008415965 0.009438680 0.009860338 0.014311649 0.022124902 0.013518074 
#>        JASA         JAS         JBS        JCGS         JMA         JNS 
#> 0.056297500 0.003881007 0.006919857 0.030368919 0.010145373 0.009411895 
#>      JRSS-A      JRSS-B      JRSS-C        JSCS        JSPI         JSS 
#> 0.031968730 0.129001545 0.017391451 0.006377070 0.011478353 0.007147141 
#>        JTSA         LDA        Mtka         SJS      StataJ       StCmp 
#> 0.023094735 0.017604584 0.013265794 0.030851089 0.016326273 0.016523633 
#>       Stats       StMed        SMMR       StMod       StNee       StPap 
#> 0.008292951 0.017007063 0.011229789 0.012792928 0.014350611 0.004146547 
#>         SPL       StSci       StSin        Tech        Test 
#> 0.014493826 0.017852216 0.021274273 0.027140415 0.007914610 

# Compare:
plot(BT2(citations), BTscores(citations))
abline(0, 1)