KSPCWords

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Class KSPCWords

java.lang.Object
  KSPCWords

public class KSPCWords
extends java.lang.Object
extends java.lang.Object

This program calculates the KSPC characteristic for various text entry techniques based on the keystrokes required to enter words in the target language.

KSPC is an acronym for "keystrokes per character". It is the number of keystrokes required, on average, to generate a character of text for a given text entry method in a given language.

Related references:

KSPC (Keystrokes per Character) as a characteristic of text entry techniques, by MacKenzie (MobileHCI 2002). This is the paper that first introduced KSPC as a characteristic statistic for text entry methods.
Text entry using a small number of buttons, by MacKenzie and Tanaka-Ishii (2007). This paper presents an analysis of KSPC and a comparison of several text entry techniques using KSPC.

Invocation:

     PROMPT>java KSPCWords file

     where file = a word+freq+keystroke file

The argument file is a text file containing a series of lines, each with three white-space delimited entries: a word, the word frequency, and the keystrokes to enter the word. The keystroke entry should include a terminating SPACE character.

The output is the KSPC characteristic for the text entry technique.

Some example invocations are shown below. The file used in the 1st invocation is d1-wordfreq-mtks.txt. The third entry on each line is the keystroke pattern needed to enter the word using the multitap a phone keypad (including a terminating SPACE). This file was built from d1-wordfreq.txt using the BuildKeystrokes utility. Consult the API for BuildKeystrokes for complete details. The other files in the invocation examples can be built using BuildKeystrokes.

Invocations - Dictionary #1: (d1-wordfreq.txt – 9022 words)

     PROMPT>java KSPCWords d1-wordfreq-mtks.txt
     KSPC = 2.0242237284857083
   
     PROMPT>java KSPCWords d1-wordfreq-m2tks.txt
     KSPC = 4.960524263792793

     PROMPT>java KSPCWords d1-wordfreq-mt4ks.txt
     KSPC = 3.4667227248852397

     PROMPT>java KSPCWords d1-wordfreq-mt6ks.txt
     KSPC = 3.139541982622594

     PROMPT>java KSPCWords d1-wordfreq-t9ks.txt  
     KSPC = 1.0064113710167126

     PROMPT>java KSPCWords d1-wordfreq-t6ks.txt  
     KSPC = 1.0288350850177785

     PROMPT>java KSPCWords d1-wordfreq-t4ks.txt  
     KSPC = 1.0669724260825588

     PROMPT>java KSPCWords d1-wordfreq-t2ks.txt  
     KSPC = 1.547122102995653
     
     PROMPT>java KSPCWords d1-wordfreq-lwks.txt          
     KSPC = 1.1467001895323452
     
     PROMPT>java KSPCWords d1-wordfreq-meks.txt           
     KSPC = 1.8157369585513656
     
     PROMPT>java KSPCWords d1-wordfreq-pagerks.txt           
     KSPC = 3.1247507835761943
     
     PROMPT>java KSPCWords d1-wordfreq-datestamp1ks.txt   
     KSPC = 10.711223210678188
     
     PROMPT>java KSPCWords d1-wordfreq-datestamp2ks.txt   
     KSPC = 10.55073639862169
     
     PROMPT>java KSPCWords d1-wordfreq-datestamp6ks.txt   
     KSPC = 4.103238636279833
     
     java KSPCWords d1-wordfreq-wpk10ks.txt 
     KSPC = 0.5050941156663911
     
     java KSPCWords d1-wordfreq-wpk5ks.txt 
     KSPC = 0.7939110125879739
     
     java KSPCWords d1-wordfreq-wpk2ks.txt   
     KSPC = 0.7292869590025196
     
     java KSPCWords d1-wordfreq-wpk1ks.txt  
     KSPC = 0.6867196447839975
     
     java KSPCWords d1-wordfreq-wps1ks.txt   
     KSPC = 0.7175690315314045
     
     java KSPCWords d1-wordfreq-wps2ks.txt   
     KSPC = 0.6272164642142578
     
     java KSPCWords d1-wordfreq-wps5ks.txt   
     KSPC = 0.5366359936980745
     
     java KSPCWords d1-wordfreq-wps10ks.txt  
     KSPC = 0.48955932330736396
     
     java KSPCWords d1-wordfreq-ttnsks.txt  
     KSPC = 1.6412600112779792

Invocations - Dictionary #2: (d2-wordfreq.txt – 64,566 words)

     PROMPT>java KSPCWords d2-wordfreq-mtks.txt          (Multitap)
     KSPC = 2.0341507188198014

     PROMPT>java KSPCWords d2-wordfreq-t9ks.txt          (T9)
     KSPC = 1.0072058361585188

     PROMPT>java KSPCWords d2-wordfreq-lwks.txt          (LetterWise)
     KSPC = 1.1500484081836353

     PROMPT>java KSPCWords d2-wordfreq-meks.txt          (MessageEase)
     KSPC = 1.8209716971531273

     PROMPT>java KSPCWords d2-wordfreq-pagerks.txt       (Glenayre pager)
     KSPC = 3.132031659103719

     PROMPT>java KSPCWords d2-wordfreq-datestamp1ks.txt  (date stamp method #1)
     KSPC = 10.65975600545338

     PROMPT>java KSPCWords d2-wordfreq-datestamp2ks.txt  (date stamp method #2)
     KSPC = 10.619927472302642

     PROMPT>java KSPCWords d2-wordfreq-datestamp6ks.txt  (date stamp method #6)
     KSPC = 4.226292050082005

     PROMPT>java KSPCWords d2-wordfreq-wpk10ks.txt  
     KSPC = 0.8131640271181506

     PROMPT>java KSPCWords d2-wordfreq-wpk5ks.txt   
     KSPC = 0.748312907208014

     PROMPT>java KSPCWords d2-wordfreq-wpk2ks.txt   
     KSPC = 0.7085798740624372

     PROMPT>java KSPCWords d2-wordfreq-wpk1ks.txt   
     KSPC = 0.7390759336078825

     PROMPT>java KSPCWords d2-wordfreq-wps1ks.txt   
     KSPC = 0.7390759336078825

     PROMPT>java KSPCWords d2-wordfreq-wps2ks.txt 
     KSPC = 0.6465846451367377

     PROMPT>java KSPCWords d2-wordfreq-wps5ks.txt  
     KSPC = 0.5506287228310269

     PROMPT>java KSPCWords d2-wordfreq-wps10ks.txt 
     KSPC = 0.5000315114434339

Invocations - Brown corpus: (bc-wordfreq.txt – 41,532 words)

     PROMPT>java KSPCWords bc-wordfreq-mtks.txt
     KSPC = 2.0442649462511326
     
     PROMPT>java KSPCWords bc-wordfreq-t9ks.txt  
     KSPC = 1.008214539459543
     
     PROMPT>java KSPCWords bc-wordfreq-lwks.txt          
     KSPC = 1.1623250386744075
     
     PROMPT>java KSPCWords bc-wordfreq-meks.txt           
     KSPC = 1.8239574145624717
     
     PROMPT>java KSPCWords bc-wordfreq-pagerks.txt           
     KSPC = 3.140325186207169
     
     PROMPT>java KSPCWords bc-wordfreq-datestamp1ks.txt   
     KSPC = 10.564776588456656
     
     PROMPT>java KSPCWords bc-wordfreq-datestamp2ks.txt   
     KSPC = 10.603084634745237

     PROMPT>java KSPCWords bc-wordfreq-datestamp6ks.txt   
     KSPC = 4.314453728184652

     PROMPT>java KSPCWords bc-wordfreq-wpk10ks.txt  
     KSPC = 0.8124519768507685

     PROMPT>java KSPCWords bc-wordfreq-wpk5ks.txt   
     KSPC = 0.7488902395077912

     PROMPT>java KSPCWords bc-wordfreq-wpk2ks.txt    
     KSPC = 0.7082677289025504

     PROMPT>java KSPCWords bc-wordfreq-wpk1ks.txt  
     KSPC = 0.7372019741154122

     PROMPT>java KSPCWords bc-wordfreq-wps1ks.txt  
     KSPC = 0.7372019741154122

     PROMPT>java KSPCWords bc-wordfreq-wps2ks.txt   
     KSPC = 0.7372019741154122

     PROMPT>java KSPCWords bc-wordfreq-wps5ks.txt  
     KSPC = 0.6479416532634211

     PROMPT>java KSPCWords bc-wordfreq-wps10ks.txt  
     KSPC = 0.5551980768504509

Invocations - Finnish corpus: (fi-wordfreq.txt – 200,000 words)

     PROMPT>java KSPCWords fi-wordfreq-mtks.txt
     KSPC = 2.2371840963420784
     
     PROMPT>java KSPCWords fi-wordfreq-t9ks.txt
     KSPC = 1.0043453727052178

     PROMPT>java KSPCWords fi-wordfreq-wpk1ks.txt
     KSPC = 0.7637596123000695

Author:: Scott MacKenzie, 2001-2015

Constructor Summary
`KSPCWords()`

Method Summary
`static void`	`main(java.lang.String[] args)`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail