Fall 2004

Clay Shields

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Project 2 - Volleyball Statistics

Assigned: October 6, 2004
Design due: October 13, 2004
Program Source code due: October 19, 2004

Volleyball Statistics Calculator

The Georgetown Beach Volleyball Club has been keeping match statistics as required by their league. They would like your help in automating the processing of the individual statistics so they can see how their players are doing. The way they want this done using a modified form of the official indoor statistics [PDF link] as explained below. Here is a gratuitous picture of the GU Beach Volleyball Club on their secret on-campus practice field.

Picture linked from http://student.sun.ac.za/volleyball/photos/images/social/beach11oct/DSC00151.JPG

Each player is referred to by their number which, since there are only two players, is either 1 or 2. For each player they keep track of the following actions and their outcomes.

Action	Code	Outcome	Code
Kill Attempt	K	Kill	K
		Error	E
		Zero	Z
Assist	A	Kill	K
		Error	E
		Zero	Z
Pass	P	Kill	K
		Error	E
		Zero	Z
Serve	S	Ace	A
		Error	E
		Zero	Z
Dig	D	Dig	D
Dig	D	Error	E
Block	B	Solo	S
		Assist	A
		Error	E

The statistics keepers (seen sitting in the lower right corner of the picture above) keep track of each touch of the ball by each player. They then enter this information into the computer in the following form:

One line with player 1's name
One line with player 2's name
One line for each touch of the ball, each with the format:
<player #> <action code> <outcome code>

There can be many lines in the file. You will be reading them one at a time from the file using a loop. A small statistics file might look like this:

Katherine Salais Fernando Stoneham 1 S A 1 S Z 2 D D 1 A K 2 K K 1 S E 2 P Z 1 A Z 2 K Z 2 Q K 1 K K

This shows only four points played. Since they play until one team reaches 25 points, the files that track a full game will be much longer. Sometimes, there are errors in the statistics files when the record keepers get sunscreen in their eyes. Notice that there is an error in the action code on the second to last line of the sample file above - there is no Q action. Fortunately, the player numbers are always correct because the sheets they use are pre-numbered, but there might be errors in the action or outcome codes. If you detect an error, output a message on where the error is in the file, and continue processing.

There are several statistics they would like for each player in each game.

kill percentage = (kills - errors)/attempts
assist percentage = (kills - errors)/attempts
pass percentage = zeros/attempts
serve percentage = (attempts - errors)/attempts
dig percentage = (digs - errors)/attempts
block percentage = (attempts - errors)/attempts
solo block percentage = (solo - errors)/attempts

Sample Runs and Data Sets

Below is a sample run of a program that implements this, run on the small data set provided.

GU Beach Volleyball Statistics Determination
Go Hoyas!

Please enter the filename of the statistics file to process:
Error in action code: Q on line 12


                   Katherine Salais   Fernando Stoneham
         Kill Percentage:     1.000               0.500
       Assist Percentage:     0.500               0.000
         Pass Percentage:     0.000               1.000
        Serve Percentage:     0.667               0.000
          Dig Percentage:     0.000               1.000
        Block Percentage:     0.000               0.000
   Solo block Percentage:     0.000               0.000

There are also some larger data sets for you to use. I have linked to them below so you can download tem if you like. I also included the command for you to use to copy them to your directory on gusun for use there. There are sample results for each file as well.

Game 1

Data set for game 1.