vbstats

fast and simple stat recorder for volleyball games
https://ellemenno.github.io/vbstats/

quick overview

volleyball

• a match is best 2 of 3 sets (3 of 5 not currently supported)
• a set is a series of rallies until a team reaches 25 points (or 15 for final set) and wins by two
• a rally is a sequence of ball contacts
• when the contact is with a human, the play continues
• when the contact is with the floor, the net, antenna, or some violation is called, play stops and a point is awarded

this app lets you record the contacts quickly, and then summarize stats for the match

usage

1. upon loading the app, you may want to record the venue, date, and team names (this is optional)
   • the venue text field is at the top, you can enter any text
   • the date picker is at the top and defaults to the current day, but any day can be selected
   • team name text field are under the court on opposite sides of the score
     • the home team (blue) is considered 'your team', and will have player jerseys attributed to contacts
     • the away team (orange) will have anonymous contacts
2. click on the jersey icon next to the home team name to select the valid jersey numbers for your team
3. choose the serving team (home or away) to start recording
   • see details about recording in full court mode or speed court mode below
4. rallies and sets will be automatically scored based on the contacts you record

full court mode

by default, the app starts in full court mode, which shows a scale model of the volleyball court and allows you to record specific contact locations. this can be useful when recording from video footage, where you have the option to pause and rewind the game, and enables review of player position in addition to stats.

after choosing the serving team,

• click in the service area for the starting team to place the first contact
  • if the contact is on your team's side, the contact agent menu will open to attribute a jersey number or the floor to the contact
• as play continues, click on the court where contact with the ball happens
  • you can click near the net for blocks, on the net or out of the court for errors
  • to record a violation, click the whistle to select which team was awarded a point

speed court mode

by clicking on the lightning icon toggle, you can toggle to speed court mode, which offers a simpler interface optimized for recording live play.

after choosing the serving team,

• if the home team is serving, click the jersey number of the serving player
• if the away team is serving, click the 1 button under touches (one touch for the serve)
• as play continues, use the buttons to record ball contacts:
  • IN or OUT on the appropriate side of the net when the ball touches the floor
  • NET if the ball contacts the net
  • for home team contacts, click the jersey number of each player who contacts the ball in the order of touch
  • for away team contacts, simply click the button representing the total number of touches used to return the ball
  • use the touches at net buttons to hint to the recorder when a block is possible
  • to record a violation, click the whistle to select which team was awarded a point

stats

vbstats infers statistics based on the transcript of a recorded match and the rules of the game

visualizations

• match transcript: short-hand record of all rallies, using color coded symbols for each contact
• contribution: points won, lost, and net contribution to match score by player
• actions: counts of contact types by player

vocab & rules

https://usavolleyball.org/resources-for-officials/rulebooks-and-interpretations/ http://fs.ncaa.org/Docs/stats/Stats_Manuals/VB/2008%20VB%20Stats%20Manual%20easy%20print.pdf https://www.wiaawi.org/Portals/0/PDF/Sports/Volleyball/vbstatspresentation.pdf

to keep things simple, vbstats has a relatively small vocabulary and pays attention to a short list of contact types.

term	definition
Serving	putting the ball into play at the start of a set and after each point
Receiving	attempt to return the ball, using no more than 3 touches
Ace	untouched or unreturnable serve that lands for a point
Pass	body-level contact keeping the ball off the floor
Attack	overhead contact of the ball designed to score
Kill	unreturnable attack that lands for a point
Block Kill	attack stopped and returned at net that lands for a point
Assist	pass to kill
Dig	first contact with opponent's attack, including off a failed block

actions

• Serve
• Block
• Pass
• Attack

effects

effect	pt	team	description
Ace	1	contacting	kill from Serve
Block Kill	1	contacting	kill from Block
Kill	1	contacting	kill from Pass or Attack
Pass	0	contacting	ball transfered between players
Error	1	opposing	from any contact

contextual effects

effect	pt	team	context
Dig	0	contacting	first Pass
Assist	0	contacting	Pass preceding Kill
Service Error	1	opposing	Error from Serve
Attack Error	1	opposing	Error from Attack
Reception Error	1	opposing	Error from Block or Pass

court specs

• 18m x 9m + 3m free zone + 6m service area at court ends
• each side is a 9m x 9m square
• attack line is 3m from net; remaining 6m is back court
• ball is 65 - 67cm

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:   :  |     :   ||   :     |  :   :
:   :  |     :   ||   :     |  :   :
:   :  |     :   ||   :     |  :   :
:   :  '--------------------'  :   :
:...:..........................:...: