WebBased Research: Issues, Problems and an Example Technique

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Web-Based ResearchIssues, Problems and an
Example Technique

• John H. Krantz
• Hanover College

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Outline

• Brief History
• Issues in Internet Research
• An Example Method
• Problems and Solutions

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History

• Email for 2-3 Decades
• 1995
• Krantz, Ballard, Scher (1997) Within Subjects
• Reips (1997) Between Subjects
• First True Web Experiments
• July 1995 List of Online Psychological Research
  sponsored by APS for awhile
• http//psych.hanover.edu/research/exponnet.html
• Almost 200 studies and study sites listed

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Why Do Internet Research

• Musch Reips (2000)
• Sample Size
• Statistical Power
• High Speed
• Ability to reach participants in other countries
• High external or ecological validity
• Low cost
• Ability to replicate a lab experiment with more
  power
• Special populations

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Issues

• Is the Sample Representative
• Yes and No
• Important to remember base of comparison
• Ideal vs. Lab
• Krantz Dalal (2000)
• Much more diverse that most lab samples
• Especially in age and education range
• Race is generally limited as is nationality

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Sample Characteristics Gender

• Are Internet Samples Male Dominated?
• Krantz Dalal (2000) Female
• GVU 1st (1994) 5
• Reips (1996) English 43 German 18
• Krantz, et al. (1997) 44
• Pasveer Ellard (1998) 3rd Study 71
• More Recent
• Caddell Utt (2004) 77
• Meyerson Tryon (2003) 45

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Sample Characteristics Age

• Are we still testing college sophomores?
• Krantz, et al. (1997) 43 gt 30
• Smith Leigh (1997) 35 gt 30
• Pasveer Ellard (1998) 45 gt 25
• GVU 1st 36 gt 30
• Caddell Utt (2004) 60 gt 30
• Pattison Rouse(2003) 16 gt 30

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Is the College Sophomore be Making a Comeback

• Plot of activity of Psychological Research on the
  Net
• Pattison Rouse (2004) 76 18-22

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Sample Characteristics Race

• How diverse are the samples?
• Unfortunately in general samples, diversity is
  still limited
• Krantz et al. (1997) 89 White
• Smith Leigh (1997) 86 White
• GVU 10th (1998b) 87 White
• ONeil, Penrod, Bornstein (2003) 82 White
• Meyerson Tryon (2003) 93 White
• However, as will be discussed later, web can make
  it possible to access special populations

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Sample Characteristics Nationality

• Where to do the subjects come from?
• Largely North American, even US, even in some
  European studies
• Krantz, et al. (1997) 86 N. Am.
• Senior, et al (1999) gt80 N. AmThis study was
  conducted in England.

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Is the Data Any Good

• Emphatically Yes

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Data Quality Direct Comparisons

• A number of studies, still, run both laboratory
  and internet samples.
• Krantz, et al. (1997)
• Regression of web means on laboratory samples
  (even though different types of samples) lab
  mean 1(Web mean) 0 r2 .99

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Compare to Established Data

• Compare web results to previously published data
  sets
• Myerson Tryon (2003)
• Studied Sexual Boredom Scale of Watt Ewing
  (1996)
• Matched sample characteristics
• Found same internal consistency
• Form of administration was not a significant
  factor

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Direct Validity Comparison

• Use same techniques to validate results
• Pasveer Ellard (1998)
• Developed new scale
• Internal consistency
• Psychomectric properties

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Data Validity Arguments

• Reips (2000)
• Statistical Power
• Limited Sample Population
• Limited External Validity
• Less than Optimal Voluntariness
• Motivational Confounding
• Experimenter Bias
• Nontransparency
• Limitations of what is feasible to research

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Interesting Deviations

• Stern Faber (1997)
• Milgrams lost letter technique
• Milgram, sent on
• Stern Faber, returned to sender
• From doing favor to doing easy task
• Often effects are smaller

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Getting Subjects General

• http//psych.hanover.edu/research/exponnet.html
• Other Pages
• Social Psychology http//www.socialpsychology.org
  /expts.htm
• The Web Experiment List http//genpsylab-wexlist.
  unizh.ch/

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Getting Subjects Special Populations

• Advertising
• Email Groups
• Careful, get permission
• Can be thought spam
• Netiquette
• Discussion Groups
• Same, permission

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Sample Method for Doing Survey

• Birnbaum, M. H. (2001). Introduction to
  Behavioral Research on the Internet. Upper
  Saddle River, NJ Prentice Hall.
• Lots of resources at http//ati.fullerton.edu/
• NSF sponsored classes at Fullerton on Social
  Psychology
• One more next January, look for the announcement
  at this site

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First Step Where to put it

• Setting up a server can be easy
• Apache web server
• http//www.apache.org
• Most popular server
• Freeware
• Any computer connected to web is now a server
• May have issues of firewalls dynamic IP
  addresses

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Second Step SurveyWiz

• In Birnbaum (2001)
• Also linked to from http//ati.fullerton.edu/
• Under Birnbaums page
• Freely available
• We will build a very short survey to illustrate

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Forms

• SurveyWiz uses web forms to collect data
• What are forms
• Elements to allow web page viewers to input
• This data is then sent back to the server to be
  processed
• SurveyWiz
• What the page looks like My Take
• Can edit it with any web page editor

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Examples I have done this year

• Caddell Utt
• Pattison Reese

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Third Step Collecting the data

• First way, let Birnbaum do it for you
• SurveyWiz is set up this way
• ltFORM actionhttp//psych.fullerton.edu/cgi-win/po
  lyform.exe/generic methodpostgt
• FTP//guestguest99_at_psych.fullerton.edu
• You can type in the address box of your browser.
  Note that this is FTP site. At the present time,
  password is guest99, as shown above, and permits
  download only.

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Keeping the Data Local

• Second, get this perl script (found at
  http//psych.fullerton.edu/mbirnbaum/programs/PERL
  _script2.htm)
• The script and instructions are at this site
• Written by Billy Schmidt
• Also change code in form command
• At my school the line reads
• ltFORM actionhttp//psych.hanover.edu/cgi-bin/surv
  ey_wiz.pl methodpostgt

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What is CGI

• Common Gateway Interface
• Method for other programs to interact with web
  servers
• In this case, this perl program takes data from
  web forms and stores them in a file
• Stores data in Excel or SPSS readable files

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Fourth Step Example Data File

• Data File
• Data coding scheme all variable names begin two
  numbers, see example
• The perl program sorts the variables by numerical
  order

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Another Method of Survey Generation

• Schmits Survey Assistant
• He manages data
• More flexibility
• http//or.psychology.dal.ca/wcs/hidden/home.html
  

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What Do I Need?

• At NSF ATI site
• List of software resources

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What Problems are important

• Musch Reips (2000) 5 point scale
• No control over participants behavior 3.6
• No control over motivation 3.4
• Inability of participants to ask questions 3.3
• Nonrepresentative sample 2.9
• Manipulation and fraud 2.4
• Ethical problems 1.5

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Problems

• Eliminating Multiple Entries
• Dropout
• Security
• Data Integrity

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Multiple Entries

• People submit too fast, while waiting for
  feedback
• People will fake being two people
• Usually have same IP address
• SurveyWiz and most other methods, sends the IP
  address of machine where survey is being taken
• Can eliminate more than one from same IP, e.g.
  Schmidt (1997)

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Security Data Integrity

• If on public server, others can access data and
  download
• Others might fake pages to send data (unlikely)
• Keep data in non-public directories so only
  researchers have access
• Have CGI check for origin of survey to make sure
  it is yours (Schmidt, 1997)

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Dropout

• People will come but not finish
• Or data is incomplete
• Survey will sends a complete signal to help you
  track
• Can use (ONeil, Penrod, Bornstein, 2003)
• Short sweet
• Financial incentives.
• If multiple pages to survey, several pages
  warm-up so not drop-out during

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Ethical Issues

• Should not think of Ethical Issues of Web
  Research Alone
• Compare to Ethics of doing Traditional Research
• Not let our comfort with what we have done blind
  us to those problems

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Conclusion

• Many Benefits
• Easy Methods
• Easy Resources
• Not alternative to traditional methods
• A new tool still needs to be used thoughtfully