El ColegiadoData on refereeing in the Liga

Undiano Mallenco × Xabi Alonso

21 matches of Xabi Alonso (Real Sociedad, Real Madrid CF) refereed by Alberto Undiano Mallenco, from 2000-01 to 2013-14.

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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

Undiano Mallenco refereed 21 Liga matches in which Xabi Alonso took part, from 2000-01 to 2013-14: 1,773 minutes played, 7 yellow cards and 0 red cards. With the other referees, over the same seasons (250 matches, 20,388 minutes), Xabi Alonso receives 0.36 yellow cards per 90 minutes, against 0.36 with Undiano Mallenco.

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

20 starts · 1,773 minutes · 9 seasons

Yellow cards

7for 7.2 expected

0.36 per 90 minutes with this referee · 0.36 with the others

no clear difference

Red cards

0for 0.1 expected

0.00 per 90 minutes with this referee · 0.00 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 cards77.20−0.0100.951.00no clear difference
Red cards00.05−0.0030.771.00no clear difference

The 21 matches

Minutes played and cards received by Xabi Alonso in each match refereed by Undiano Mallenco.

DateMatchTeamMinutesYellowsReds
18 Mar 2001Real Sociedad 1-1 Deportivo AlavésReal Sociedad0′ → 66′00
2 Feb 2002Real Sociedad 2-1 Villarreal CFReal Sociedad0′ → 90′00
22 Sept 2002Real Sociedad 3-3 Real BetisReal Sociedad0′ → 76′00
23 Nov 2002Rayo Vallecano 0-0 Real SociedadReal Sociedad0′ → 90′00
2 Mar 2003Real Valladolid 3-0 Real SociedadReal Sociedad0′ → 90′00
20 Apr 2003Real Sociedad 5-0 Rayo VallecanoReal Sociedad0′ → 68′10
10 Jan 2004Real Sociedad 1-0 Real Madrid CFReal Sociedad↑ 57′ → 90′00
29 Nov 2009FC Barcelona 1-0 Real Madrid CFReal Madrid CF0′ → 90′00
28 Mar 2010Real Madrid CF 3-2 Atlético MadridReal Madrid CF0′ → 90′10
24 Apr 2010Real Zaragoza 1-2 Real Madrid CFReal Madrid CF0′ → 90′10
16 May 2010Málaga CF 1-1 Real Madrid CFReal Madrid CF0′ → 90′00
16 Oct 2010Málaga CF 1-4 Real Madrid CFReal Madrid CF0′ → 90′00
20 Nov 2010Real Madrid CF 5-1 Athletic BilbaoReal Madrid CF0′ → 90′10
3 Jan 2011Getafe CF 2-3 Real Madrid CFReal Madrid CF0′ → 90′00
15 May 2011Villarreal CF 1-3 Real Madrid CFReal Madrid CF0′ → 90′10
29 Oct 2011Real Sociedad 0-1 Real Madrid CFReal Madrid CF0′ → 90′00
12 Feb 2012Real Madrid CF 4-2 Levante UDReal Madrid CF0′ → 90′00
21 Apr 2012FC Barcelona 1-2 Real Madrid CFReal Madrid CF0′ → 90′10
15 Sept 2012Sevilla FC 1-0 Real Madrid CFReal Madrid CF0′ → 90′00
1 Dec 2012Real Madrid CF 2-0 Atlético MadridReal Madrid CF0′ → 90′00
23 Mar 2014Real Madrid CF 3-4 FC BarcelonaReal Madrid CF0′ → 90′10

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

Xabi Alonso with other referees

  • César Muñiz Fernández16 matches
  • Carlos Clos Gómez14 matches
  • Mateu Lahoz14 matches
  • Ramírez Domínguez13 matches
  • Fernando Teixeira Vitienes12 matches
  • David Fernández Borbalán11 matches