Fi#s’  Law  Project	
ChickenSoup
Overview
•  What  is  'ʹFi#s  Law'ʹ?	
•  Research  Design	
•  Research  Method	
•  Data  Collection	
•  Results	
•  Analys...
What is 'Fitts’ Law'?
An  empirical  model  explaining  speed-­‐‑accuracy  tradeoff  
characteristics  of  human  muscle  m...
Research Design
•  Independent  Variables	
            -­‐‑  size  of  the  target	
            -­‐‑  distance  of  the  t...
Research Method
•  Testing  application  developed  in  HTML  and  
javascript	
	
•  1st  version	
            -­‐‑    bu#...
Research Method
•  Three  cases  of  testing:	
o  Same  distance  from  start  bu#on,  varying  target  size.	
	
6  trials...
Experiment description
•  Same  computer,  same  mouse	
•  In  same  order:	
•  Conducted  in  the  same  environment	
Var...
Interface
Each  trial  starts  with  the  START  bu#on
Data Collection
•  logging  key  strokes  (hits  and  misses)	
•  History	
•  Data  analysis
Analysis - constant distance, varied size
Analysis – constant size, varied distance
Analysis - varied both distance and size
Analysis- All data for each person
Error	
•  Error  =  Actual  Time  -­‐‑  Estimated  Time	
•  Actual  Time:  the  real  time  spent  by  users  in  clicking...
Error - constant distance, varied size
Error - constant size, varied distance
Error - varied both distance and size
Correlation and Dependence
Pearson  product-­‐‑moment  correlation  coefficient  is  a  
measure  of  the  correlation  (lin...
Correlation and Dependence
Discussions
	
 	
 	
 	
	
We  cannot  say  that  we  have  accurately  replicated  
Fi#s’  law  :	
•  Unequal  no.  of  tri...
Discussions
•  Considerations  for  further  study	
o  Eliminate  confounds	
o  Add  more  trials
Fitts law
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Fitts law

  1. 1. Fi#s’  Law  Project ChickenSoup
  2. 2. Overview •  What  is  'ʹFi#s  Law'ʹ? •  Research  Design •  Research  Method •  Data  Collection •  Results •  Analysis •  Discussion
  3. 3. What is 'Fitts’ Law'? An  empirical  model  explaining  speed-­‐‑accuracy  tradeoff   characteristics  of  human  muscle  movement   •  As  a  target  gets  smaller  and/or  further  away,  it  takes   longer  to  move  to  it http://www.interaction-design.org/encyclopedia/fitts_law.html)
  4. 4. Research Design •  Independent  Variables            -­‐‑  size  of  the  target            -­‐‑  distance  of  the  target  from  start  bu#on •  Dependent  Variable            -­‐‑    time  to  move  to  the  target •  Within  participants  design •  Three  test  conditions  
  5. 5. Research Method •  Testing  application  developed  in  HTML  and   javascript •  1st  version            -­‐‑    bu#ons  randomly  assigned •  2nd version - buttons manually assigned - previously saved positions and sizes in arrays       •  Size  = [5, 10 , 15 , 20 , 25];        index  =  [0,  3  ,  2  ,  1  ,  4];        output  =  [5, 20, 15, 10, 25];  
  6. 6. Research Method •  Three  cases  of  testing: o  Same  distance  from  start  bu#on,  varying  target  size. 6  trials  for  each  participant o  Same  size  target,  but  varying  distance  from  start   bu#on. 10  trials  for  each  participant o  Varying  target  size  and  distance  from  the  start   bu#on 10  trials  for  each  participant
  7. 7. Experiment description •  Same  computer,  same  mouse •  In  same  order: •  Conducted  in  the  same  environment Varied size Varied bothVaried distance
  8. 8. Interface Each  trial  starts  with  the  START  bu#on
  9. 9. Data Collection •  logging  key  strokes  (hits  and  misses) •  History •  Data  analysis
  10. 10. Analysis - constant distance, varied size
  11. 11. Analysis – constant size, varied distance
  12. 12. Analysis - varied both distance and size
  13. 13. Analysis- All data for each person
  14. 14. Error •  Error  =  Actual  Time  -­‐‑  Estimated  Time •  Actual  Time:  the  real  time  spent  by  users  in  clicking  a   bu#on •  Estimated  Time:  the  time  that  should  be  used  according   to  fi#s  law
  15. 15. Error - constant distance, varied size
  16. 16. Error - constant size, varied distance
  17. 17. Error - varied both distance and size
  18. 18. Correlation and Dependence Pearson  product-­‐‑moment  correlation  coefficient  is  a   measure  of  the  correlation  (linear  dependence)  between   two  variables  X  and  Y. The  coefficient  ranges  from  -­‐‑1  to  +1 The  sample  correlation  coefficient  is  wri#en:
  19. 19. Correlation and Dependence
  20. 20. Discussions We  cannot  say  that  we  have  accurately  replicated   Fi#s’  law  : •  Unequal  no.  of  trials  across  the  conditions •  different  motor  skills •  experience  with  mouse  vs  trackpad
  21. 21. Discussions •  Considerations  for  further  study o  Eliminate  confounds o  Add  more  trials
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