Profiling half-back play in rugby union and the impact of substitutions

Mike Hughes, Gordon Smyth

Abstract

An exploratory method of quantifying the impact of individual players in rugby union was developed and applied to both half-back positions in 2015 Rugby World Cup matches with a view to firstly test the validity of these systems by profiling players, and secondly, if successful, to assess the impact of substitutions. A match impact scoring system was devised using questionnaire responses of an expert group of professional rugby analysts and experienced international coaches. The scoring system weighted each game action in a positive or negative manner according to the impact on team performance. It was found that the proposed method produced valid and reliable data concerning player performance. It was applied to half-backs substituted with more than 20 mins playing time left, the two 20 min period, before and after substitution, were compared. A “non-substituted” control group were also analysed, in both the first and final 20 minutes of competition. It was found that for the scrum-half position, the starting players produced a higher median ‘efficacy’ score than replacement players 27.46, (std. dev. +10.06) and 20.42, (+12.45). The best performing scrum-half group were the 60-80 minute non-replaced players 29 (+9.0). For the out-half position, it was found that the highest median ‘efficacy’ was achieved by the replacement player group 18.80, (+ 11.00), with the non-replaced 60-80 minute group performing worst 14.40, (+ 7.09). Future research should develop the methods applied in this study to define player profiles for each position on the rugby field. It is suggested that these profiles should use score difference between the teams to take into account the strength of the teams involved. The concept of a weighted individual player efficacy system has been demonstrated in the sport of rugby union, but could be applied in any team sport where greater individual player performance data is required.


Keywords

Player profiling; Substitutions; Rugby Union

References

Bremner, S., Robinson, G. and Williams, M.D. (2013). A retrospective evaluation of team performance indicators in rugby union. International Journal of Performance Analysis in Sport, 13:2, 461-473. https://doi.org/10.1080/24748668.2013.11868662

Carroll, R. (2013). Team performance indicators in Gaelic football and opposition effects. International Journal of Performance Analysis in Sport, 13:3, 703-715. https://doi.org/10.1080/24748668.2013.11868682

Heasman, J., Dawson, B., Berry, J. and Stewart, G. (2008). Development and validation of a player impact ranking system in Australian football. International Journal of Performance Analysis in Sport, 8:3, 156-171. https://doi.org/10.1080/24748668.2008.11868457

Hughes, M. and Bartlett, R.(2002). The use of performance indicators in performance analysis. Journal of Sports , 20, 739 – 754. https://doi.org/10.1080/026404102320675602

Hughes, M., Cooper, S-M. and Nevill, A. (2002) Analysis procedures for non-parametric data from performance analysis. EIJPAS International Journal of Performance Analysis Sport (Electronic), 2, 6 – 20. https://doi.org/10.1080/24748668.2002.11868257

Hughes, M. T., Hughes, M. D., Williams, J., James, N., Vučković, G. and Locke, D. (2012a). Performance indicators in rugby union. Journal of Human Sport and Exercise, 7:7, 383-401. https://doi.org/10.4100/jhse.2012.72.05

Hughes, M., Caudrelier, T., James,N., Redwood-Brown, A., Donnelly, I., Kirkbride, A. and Duschesne, C. (2012b). Moneyball and soccer - an analysis of the key performance indicators of elite male soccer players by position. Journal of Human Sport and Exercise, 7, 402 – 412. https://doi.org/10.4100/jhse.2012.72.06

International Rugby Board, (2011). Rugby World Cup 2011 – Statistical review and match analysis. Dublin: International Rugby Board.

James, N., Mellalieu, S. and Jones, N. (2005). The development of position-specific performance indicators in professional rugby union. Journal of Sports Sciences, 23:1, 63-72. https://doi.org/10.1080/02640410410001730106

Jones, N., Mellalieu, S. and James, N. (2004). Team performance indicators as a function of winning and losing in rugby union. International Journal of Performance Analysis in Sport, 4:1, 61-71. https://doi.org/10.1080/24748668.2004.11868292

Lim, E., Lay, B., Dawson, B., Wallman, K. and Aanderson, S. (2009). Development of a player impact ranking matrix in Super 14 rugby union. International Journal of Performance Analysis in Sport, 9:3, 354-367. https://doi.org/10.1080/24748668.2009.11868492

O'Donoghue, P. (2010). Research methods for sports performance analysis. Oxford: Routledge.

Pearce, M. and Hughes, M. (2001). Substitutions in Euro 2000. In M.D. Hughes (ed.) pass.com, Cardiff: UWIC, pp. 303 – 317.

Prim, S., van Rooyen, M. and Lambert, M. (2006). A comparison of performance indicators between the four South African teams and the winners of the 2005 Super 12 Rugby competition. What separates top from bottom? International Journal of Performance Analysis in Sport, 6:2, 126-133. https://doi.org/10.1080/24748668.2006.11868378

Quarrie, K. L., Hopkins, W. G., Anthony, M. J., and Gill, N. D. (2013). Positional demands of international rugby union: Evaluation of player actions and movements. Journal of Science and Medicine in Sport, 16:4, 353-359. https://doi.org/10.1016/j.jsams.2012.08.005

Vaz, L., Rooyen, M. and Sampaio, J. (2010). Rugby game-related statistics that discriminate between winning and losing teams in I.R.B. and Super Twelve close games. Journal of Sports Science & Medicine, 9:1, 51-55.

Villarejo, D., Palao, J., Ortega, E., Gomez-Ruano, M. and Kraak, W. (2015). Match-related statistics discriminating between playing positions during the men's 2011 Rugby World Cup. International Journal of Performance Analysis in Sport, 15:1, 97-111. https://doi.org/10.1080/24748668.2015.11868779

World Rugby, (2011). Replacements increasing in influence, analysis shows http://www.worldrugby.org/news/91646 [accessed 6th May 2016].

World Rugby, (2015). Coaching- The home of rugby coaching on the web. Scrum-Half/Half-back. http://coaching.worldrugby.org/?module=2§ion=8&subsection=55&page=2088 [accessed on 5th November 2015].

World Rugby, (2015). Coaching- The home of rugby coaching on the web. Stand-off / Fly-half / Out-half. http://coaching.worldrugby.org/?module=2§ion=8&subsection=56 [accessed on 5th November 2015].

World Rugby, (2016). Laws of the game. Rugby Union http://laws.worldrugby.org/?law=3&language=EN [accessed 8th May 2016].




DOI: https://doi.org/10.14198/jhse.2018.134.20





License URL: https://creativecommons.org/licenses/by-nc-nd/4.0/