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Project Report

Project Report. An investigation on data entry effectiveness & efficiency. Agenda. Introduction Experiment Design Experiment Platform Data Analysis Conclusion. Introduction . Developing fast and efficient means for text entry is one of the most pressing research topics in today!

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Project Report

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  1. Project Report An investigation on data entry effectiveness & efficiency

  2. Agenda Introduction Experiment Design Experiment Platform Data Analysis Conclusion

  3. Introduction Developing fast and efficient means for text entry is one of the most pressing research topics in today! Although the QWERTY layout is entrenched for physical keyboards, soft keyboards are easy to implement and customize.

  4. Objective To develop a statistically reliable analysis of possible factors that may have influence on the input efficiency and error rateof the soft keyboard and give design guideline on this issue.

  5. Response variables • Average typing speed • Error rate

  6. Cause–and-effect Diagram

  7. Control variables Keyboard layout Key size Key shape Mouse C/R ratio

  8. Keyboard layout

  9. Other Control Factors Key size Large: the size of keys on standard physical keyboard Small: that of general electronic dictionaries Mouse C/R ratio High: the highest in the tested computer. Low: adjusted one which is the lower bound that one can bear Key shape • There are three kinds of key shape generally, but we choose two of them for simplicity: circle and square, the rest is hexagon

  10. Learning Curve for Novice

  11. Experiment Design(1/3) • Mixed Level Full Factorial Design • Repleicated on two testees • Each testee enters the same paragraph of text with different combinations of control factors

  12. Experiment Design(2/3)

  13. Experiment Design(3/3) • Block On Noise Variables • Data within each block is homogenous (exclude the potential influence of different users) • Enough DOF to Estimate Interactions • Eliminate Learning Effect • Two replicates with different (randomly generated) execution sequence

  14. Platform(1/4) • Large-Small • High-Low • FITALY-OPTI II-METROPOLIS-QWERTY • Square-Circle. • There are 16 different types of soft keyboard in all.

  15. Platform(2/4) FITALY OPTI II METROPOLIS QWERTY

  16. Platform(3/4)

  17. Platform(4/4) • Saved in CSV files • Key name, x-coordinate, y-coordinate, the time when it is entered • Errors: number of “Backspace”

  18. Discussion on Error Rate Click “Backspace” when ever testee notices error and count the number of “Backspace” clicked as error Errors may not be noticed immediately. Sequence of the words or letters may be changed, due to other reasons unrelated to the keyboard.

  19. Analysis • Tools • DOE++ • Minitab • Two Kinds of Responses • Time • Error rate • Principle • Treat different responses separately • Find an integrative optimal solution

  20. Response Time Data Analysis

  21. Step 1: ANOVA The main effect is significant

  22. Step 2: Regression • Ignore the 3 or higher order effects • Keep the significant items

  23. Step 3:Probability Plot

  24. Step 4: Eliminate Insignificant factors • Keep A, B1, B2, B3

  25. Step 5: Residual Checking

  26. Step 6: Interaction Matrix

  27. Conclusion • Time will be shorter when • factor size= 2(larger size) • factor layout=1(qwerty), and then 4(FITALY), 2(metro), 3(OPTI) • The factor shape and C/R ratio will not influence the result if the response is time

  28. Error Rate Data Analysis

  29. Step 1: ANOVA The main effect is significant

  30. Step 2: Regression • Ignore the 3 or higher order effects • Keep the significant items

  31. Step 3: Probability Plot

  32. Step 4: Eliminate Insignificant Factors • Keep B1, AB1, AB2, C

  33. Step 5: Residual Checking

  34. Step 6: Interaction Matrix

  35. Conclusion • It is more reasonable to choose factor size= 2(larger size) • Hence factor layout = 4(FITALY) will be chosen when the size=2 • The factor C/R ratio=1(low) will be better • Factor shape has no effects

  36. Final Recommendation • Larger size • FITALY layout • Low C/R ratio • Both shapes

  37. Potential Weakness • Limited Sample Size • Both Young Female University Students • Familiar with QWERTY • Without Upper Case • Limited to English Text

  38. Q&A Thank you

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