El ColegiadoData on refereeing in the Liga

Alfonso Álvarez × Gonzalo Castro

21 matches of Gonzalo Castro (RCD Mallorca, Real Sociedad, Málaga CF) refereed by Alfonso Javier Álvarez Izquierdo, from 2008-09 to 2017-18.

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Player data: 2000-01 → 2021-22 only. Player-level match sheets come from Zenodo (BeSoccer, CC BY-NC 4.0 licence, non-commercial use). No free source provides them after 2021-22: more recent matches are not counted here. Penalties conceded are not attributed to players in the source, so they are not analysed.

In short

Alfonso Álvarez refereed 21 Liga matches in which Gonzalo Castro took part, from 2008-09 to 2017-18: 1,108 minutes played, 4 yellow cards and 0 red cards. With the other referees, over the same seasons (256 matches, 15,797 minutes), Gonzalo Castro receives 0.17 yellow cards per 90 minutes, against 0.33 with Alfonso Álvarez.

Verdict: no clear difference with the other referees.

Cards are rare (less than one per player per match): over a few dozen matches, only a very large deviation can be told apart from chance. "No clear difference" does not mean "no effect".

Matches

21

12 starts · 1,108 minutes · 10 seasons

Yellow cards

4for 2.3 expected

0.33 per 90 minutes with this referee · 0.17 with the others

no clear difference

Red cards

0for 0.2 expected

0.00 per 90 minutes with this referee · 0.02 with the others

no clear difference
For experts: statistical tests and method

Permutation test stratified by season: within each season, the player's matches given to this referee are drawn again at random among all the player's matches (same number per season). Deviation = (observed − expected cards) per 90 minutes played with this referee; positive = more cards than expected. q: Benjamini-Hochberg correction over the 3,781 pairs with at least 10 matches, separately for yellows and reds.

MeasureObservedExpectedDeviation / 90 minpqVerdict
Yellow cards42.26+0.1420.240.98no clear difference
Red cards00.16−0.0130.551.00no clear difference

The 21 matches

Minutes played and cards received by Gonzalo Castro in each match refereed by Alfonso Álvarez.

DateMatchTeamMinutesYellowsReds
30 Nov 2008Real Valladolid 3-0 RCD MallorcaRCD Mallorca↑ 77′ → 90′00
23 Apr 2009RCD Mallorca 2-0 Real ValladolidRCD Mallorca↑ 79′ → 90′00
18 Oct 2009RCD Mallorca 3-1 Getafe CFRCD Mallorca0′ → 90′00
13 Dec 2009CA Osasuna 0-1 RCD MallorcaRCD Mallorca0′ → 86′10
4 Apr 2010UD Almería 1-1 RCD MallorcaRCD Mallorca0′ → 90′10
23 Oct 2010Valencia CF 1-2 RCD MallorcaRCD Mallorca0′ → 90′00
19 Mar 2011RCD Mallorca 1-0 Real ZaragozaRCD Mallorca0′ → 60′00
19 Feb 2012RCD Mallorca 4-0 Villarreal CFRCD Mallorca0′ → 90′00
21 Apr 2012RCD Mallorca 1-0 Real ZaragozaRCD Mallorca0′ → 78′00
29 Oct 2012Real Valladolid 2-2 Real SociedadReal Sociedad0′ → 74′00
20 Dec 2012Real Sociedad 2-1 Sevilla FCReal Sociedad↑ 84′ → 90′00
14 Apr 2013Rayo Vallecano 0-2 Real SociedadReal Sociedad↑ 77′ → 90′10
18 May 2013Sevilla FC 1-2 Real SociedadReal Sociedad↑ 87′ → 90′00
10 Mar 2014Real Sociedad 2-3 Rayo VallecanoReal Sociedad0′ → 63′00
24 Aug 2014SD Eibar 1-0 Real SociedadReal Sociedad↑ 71′ → 90′00
9 Nov 2014Real Sociedad 2-1 Atlético MadridReal Sociedad0′ → 84′00
12 Sept 2015Real Betis 1-0 Real SociedadReal Sociedad↑ 47′ → 90′00
23 Sept 2016Real Betis 1-0 Málaga CFMálaga CF↑ 77′ → 90′10
5 Mar 2017Athletic Bilbao 1-0 Málaga CFMálaga CF↑ 73′ → 90′00
21 Dec 2017Deportivo Alavés 1-0 Málaga CFMálaga CF0′ → 90′00
1 Apr 2018Málaga CF 1-0 Villarreal CFMálaga CF0′ → 75′00

↑: came on as a substitute. Stoppage time is not recorded in the source: minutes stop at 90.

Gonzalo Castro with other referees

  • Estrada Fernández17 matches
  • Mateu Lahoz17 matches
  • Carlos Velasco Carballo17 matches
  • Undiano Mallenco16 matches
  • Ayza Gámez14 matches
  • David Fernández Borbalán14 matches
  • Del Cerro Grande13 matches
  • Carlos Clos Gómez12 matches
  • Iglesias Villanueva10 matches
  • José Paradas Romero10 matches