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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

Project Report

An investigation on data entry effectiveness & efficiency

agenda
Agenda

Introduction

Experiment Design

Experiment Platform

Data Analysis

Conclusion

introduction
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.

objective
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.

response variables
Response variables
  • Average typing speed
  • Error rate
control variables
Control variables

Keyboard layout

Key size

Key shape

Mouse C/R ratio

other control factors
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
experiment design 1 3
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
experiment design 3 3
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
platform 1 4
Platform(1/4)
    • Large-Small
    • High-Low
    • FITALY-OPTI II-METROPOLIS-QWERTY
    • Square-Circle.
  • There are 16 different types of soft keyboard in all.
platform 2 4
Platform(2/4)

FITALY

OPTI II

METROPOLIS

QWERTY

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

analysis
Analysis
  • Tools
    • DOE++
    • Minitab
  • Two Kinds of Responses
    • Time
    • Error rate
  • Principle
    • Treat different responses separately
    • Find an integrative optimal solution
response time
Response Time

Data Analysis

step 1 anova
Step 1: ANOVA

The main effect is significant

step 2 regression
Step 2: Regression
  • Ignore the 3 or higher order effects
  • Keep the significant items
conclusion
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
error rate
Error Rate

Data Analysis

step 1 anova1
Step 1: ANOVA

The main effect is significant

step 2 regression1
Step 2: Regression
  • Ignore the 3 or higher order effects
  • Keep the significant items
conclusion1
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
final recommendation
Final Recommendation
  • Larger size
  • FITALY layout
  • Low C/R ratio
  • Both shapes
potential weakness
Potential Weakness
  • Limited Sample Size
    • Both Young Female University Students
    • Familiar with QWERTY
  • Without Upper Case
  • Limited to English Text
slide38
Q&A

Thank you