EDUR 9131
Doctoral Research Methods
Note:
single measure for overall construct
measure
- place in clendar
- place in instructions for gropu progject
- place in notes
reversed score = (minimum score) + (maximum score) – actual score souorce: www.theanalysisfactor.com/easy-reverse-code
Summer 2012
Instructor/Facilitator: Bryan W. Griffin
My personal web pages can be found at http://coe.georgiasouthern.edu/foundations/bwgriffin/
Announcements:
Activity 1 due date extended to June 21.
Course Index (check frequently for alterations)
A. Course Administration
B. Activities that count toward course grade
Andy Field, of the University of Sussex, has students complete a similar project. He provides useful insight into the steps one must take to develop a questionnaire so I recommend you review his project instructions: Design a Questionnaire
C. Activities that do not count toward course grade
D. Course Notes and Assigned Readings
1. Review of Educational Research (linked readings below were taken from EDUR 7130, Introduction to Educational Research)
2. Review of Descriptive Statistics and Inferential Statistics
3. Questionnaire Development
4. Reliability
(a) Read: de Vaus chapter 11; pp 52-53; pp. 180-186; review "Scaling Checklist" p. 195; William Gabrenya's Reliability
(b) Stability with test-retest (scores must be correlated, and means should be similar; correlation and correlated samples t-test)
(c) Equivalent forms, brief overview
(d) Internal Consistency with Cronbach's alpha
(e) Scorer-rater; inter-judge agreement -- Discussed below with coding open-ended responses
5. Sample Size Determination
(a) Read: de Vaus chapter 6; and Cohen 1992
(b) Excel spreadsheet to calculate sample size or power, or to convert among effect size measures: http://www.bwgriffin.com/samplesize
(c) Yes/No Items (categorical variable status; use for Chi-square type analyses)
To find sample sizes for studies involving simple proportions, such as responses to Yes/No type questions (assumes binomial distribution)
- sample_size_proportion.xls (Excel [or OpenOffice] file download)
- D. A. de Vaus (2004). Surveys in social research (5th ed.). Routledge press. See Tables and pages 80 through 83.
- http://www.raosoft.com/samplesize.html
(d) Effect Size d
- Effect size d: Thalheimer & Cook 2002 Becker 2000 (see also Notes 5 t-tests pp. 12-13)
- Calculation and Interpretation of d
- pooled vs. control group sd for calculation of d
- Distributional overlap illustration:
- Cohen's recommended effect sizes (refer to Cohen's article linked above)
- Effect size conversions: see Excel spreadsheet to calculate sample size or power linked above in (b), or see content\sample_size_effect_size_conversion.xls
(e) Group Comparisons
To find sample sizes for group comparisons (e.g., t-tests, ANOVA type analyses)
- sample_size_in_ANOVA_Maxwell_Delaney.pdf (per group)
- Cohen 1992 Table 2 (per group)
(f) Correlation
Sample sizes for Pearson's correlations
- sample_size_correlation.xls (Excel [or OpenOffice] file download)
- (Source for formula used in above Excel file: Dell, Holleran, & Ramakrishnan 2002)
- An on-line calculator for sample size for correlation can be found here: http://www.biomath.info/power/corr.htm
(g) Regression -- presented below after coverage of regression
(h) Other software or websites for sample size calculations
G Power -- free software for sample size determination
- Free sample size software: http://www.psycho.uni-duesseldorf.de/abteilungen/aap/gpower3/
- Also downloadable from course web site (9.7MB): content\GPower3Windows.zip
- On-line sample size calculators:
6. Coding open-ended questionnaire responses (conceptual analysis discussed here; see link below by Palmquist 2008 for relational analysis example).
(a) Read: de Vaus chapter 9, and the following works by Le Compte, Palmquist, Glenn, and Tobacco Control:
- Le Compte 2000 Analyzing Qualitative Data. Theory into Practice, 39, 146-154
- Palmquist 2008 Content Analysis
- Glenn 2007 Analyzing Open-ended Questions (blog or discussion board post of simple steps to follow)
- Tobacco Control Evaluation (no date) Content Analysis: A Method for Analyzing Qualitative Data
- Stemler 2001 An Overview of Content Analysis (brief discussion of rater reliability)
- Supplemental reading:
- http://www.bwgriffin.com/gsu/courses/edur9131/readings/content_analysis_tobacco.pdf
- http://www.bwgriffin.com/gsu/courses/edur9131/readings/content_analysis_acell.pdf
- http://www.bwgriffin.com/gsu/courses/edur9131/readings/content_analysis_analyzingqualdata.pdf (within framework of qual. analysis)
- http://www.bwgriffin.com/gsu/courses/edur9131/content/PASS_coding_data.pdf
- http://tobaccoeval.ucdavis.edu/files/ReadyTalk/Analyzing_Qualitative_Data/lib/playback.html (analyzing qualitative data webinar)
(b) Codebooks/Codesheets
- Development: http://www.bwgriffin.com/gsu/courses/edur9131/readings/content_analysis_codebook.pdf
- Samples: http://academic.csuohio.edu/kneuendorf/content/hcoding/hcindex.htm
- Sample Questionnaire and Coding Sheet:
- Sample questionnaire: sample_survey_open_ended_authorship.pdf
- Sample code sheet: sample_code_sheet_open_ended_authorship.pdf
- Coded response #420: open_ended_coding_example_420.pdf
- Coded response #1140: open_ended_coding_example_1140.pdf
- Published version of questionnaire and results presented above: Moore & Griffin 2006
(c) Reliability -- inter-rater and intra-rater agreement
- Rating Scales are Categorical/Nominal (angry, fearful, contempt, disgust) or Few Ranked Categories (poor, good, very good)
- Notes on Inter-rater Agreement with Categorical Data
- Review of inter-rater agreement: http://www.bwgriffin.com/gsu/courses/edur9131/content/Inter_Rater_agreement.pdf
- Percentage Agreement
- Simple count of agreement/disagreement with percentage agreement calculated for two raters
- Index of concordance = A / (A+D) where A=agreement and D=disagreement
- Mean level of agreement if more than two raters
- Kappa:
- Useful for two raters with unordered rating scale or few ordered options
- Discussion: Viera & Garrett 2005
- Example of kappa use: Uiters et al 2006, see page 4 and table
- SPSS -- see Inter-rater Agreement with Categorical Data
- Requires symmetrical scores -- all scores must be present for each rater (Rater A uses 1 to 5, Rater B uses 1 to 4, no kappa)
- Likely not useful if number of categories is large (many themes to coding responses, good for overall judgments [excellent, pass, fail])
- SPSS notes
- http://www.stattutorials.com/SPSS/TUTORIAL-SPSS-Interrater-Reliability-Kappa.htm
- http://www.uccs.edu/~faculty/lbecker/SPSS/ctabk.htm
- http://www.sma.org.sg/smj/4412/4412bs1.pdf -- page 617
- (problem, all categories must be present for both raters): http://www.ats.ucla.edu/stat/spss/faq/kappa.htm (can 3+ raters be used?)
- Supplemental reading on kappa: http://www.childrens-mercy.org/stats/definitions/kappa.htm
- Kappa for more than two raters
- See Inter-rater Agreement with Categorical Data
- Note to instructor: http://www.ccitonline.org/jking/homepage/interrater.html (Excel files for Fleiss kappa; large excel may be problematic)
- Rating Scales are Ordinal with Several Steps, or Interval/Ratio Scale
- Notes on Inter-rater Agreement with Ranked/Interval Data
- Two Raters
- Correlation between pairs of scores
- Check for mean differences/similarities
- More than Two Raters
- Intra-class Correlation (check description of single vs. multiple judge intra-class correlation estimates from SPSS - definition)
- Cronbach's alpha
- Note to instructor: http://www.bwgriffin.com/gsu/courses/edur9131/content/interrater_agreement_vs_reliability.pdf add this discussion to Inter-rater Agreement notes.
- Instructor note (students may ignore): Spearman rho; Kendall’s coefficient concordance (W) -- mean of all Spearman rho among raters; Cronbach's alpha among raters (yes)? Supplemental notes http://tinyurl.com/47ens9j
- Instructor note: See Liao Hunt Chen 2010 Comparison between inter-rater reliability and inter-rater agreement in performance assessments. Annals of Academy of Medicine
- Instructor note: http://www.bwgriffin.com/gsu/courses/edur9131/content/interrater_agreement_vs_reliability.pdf add this discussion to Inter-rater Agreement notes.
7. Validity -- Providing Evidence
(a) Read: de Vaus chapter 4
(b) Summary notes: http://www.bwgriffin.com/gsu/courses/edur9131/content/Validity_According_to_Standards.pdf
(c) Read the following articles:
(d) Illustrative Examples of Validity Evidence -- for each, in what ways is validity evidenced?
8. Factor Analysis
(a) Read:
(b) Notes on Conducting Factor Analysis
(c) Reporting Factor Analysis
E. SPSS Tutorials (obtained from various on-line sources: Dr. McKnight at U. Oklahoma, Dr. Elvers at U. of Dayton, Guang-Hwa Change at Youngstown State U.)
F. PDF File Creation
Since groups will be required to submit this project, I will only accept PDF attachments from one individual in each group. See detailed instructions on this in the Research Project link above. If you do not know how to create a PDF file, use one of the following sources:
Here are a few free web page that convert files to PDF over the internet:
I use the following free software to create my PDF files (it leaves no watermark): http://www.primopdf.com/
I also use OpenOffice to create some free PDF files. Open Office is a free Office Suite similar to Microsoft Office (Open Office leaves no watermark): http://www.openoffice.org/
If you want further tips and links for converting to free PDFs, read this site http://www.pruittfamily.com/paul/freepdf.htm or this http://en.wikipedia.org/wiki/List_of_PDF_software .
G. Reporting Statistical Outcomes
APA style for t-test, correlation, regression, ANOVA, chi-square: Reporting Statistics (Word document with sample APA styled tables and written presentations).
Add factor analysis.
Course Calendar (tentative plan of course coverage)
Session | Date | Topic |
1 |
5/21 |
1. Syllabus 2. Research Project -- Review Activity 1 Assignment 3. Questionnaire Development
4. Literature Searches -- brief review using Google Scholar and GALILEO (search for reading interest measure; also add literature review writing, list vs. integration, early vs. late citations, transitions). 5. Review of basics of educational research 6. Review of Descriptive Statistics and Inferential Statistics 7. SPSS Introduction
|
|
5/27 |
1. Activity 2 Assignment due Possible videos will be posted for viewing
|
|
5/28 |
1. Discuss Activity 2 : Instrument
Construction Steps 2. Questions on Activity 1 -- Brief review of questionnaire item wording and development; guidelines to questionnaire construction (practical tips)
3. Review of independent and correlated samples t-test (read: de Vaus chapter 15)
4. Review of Pearson's Correlation (read: de Vaus chapter 14)
5. Reliability (Spring 2011 -- covered briefly tips on questionnaire construction, independent samples t-test, correlation, Cronbach's alpha)
|
|
5/31 |
1. First draft questionnaire you plan to use for the Activity 1 is due
Possible video of Sample Size Determination posted by 6/1 (see de Vaus chapter 6; Cohen 1992)
|
3 |
6/4 |
1. Note to students: Send revised group research project questionnaire to instructor for final review. 2. Work through internal consistency exercise: http://www.bwgriffin.com/gsu/courses/edur9131/content/cronbachs_alpha_exercise_data.sav 3. Correlated samples t-test (read: de Vaus chapter 15)
4. Reliability: Test-retest
5. Coding open-ended questionnaire responses (conceptual analysis discussed here; see Palmquist 2008 for relational analysis example). Read de Vaus chapter 9, and the following works by Le Compte, Palmquist, Glenn, and Tobacco Control: 6. Begin Regression, see de Vaus' text pp 280-288 Other readings from my course notes in EDUR 8131 (introductory statistics): SPSS Regression Videos
(Spring 2011: Covered all above except correlated t-test, started simple regression)
|
6 |
2/28 |
1. Resume Regression
2. Review sample size determination for regression; see Cohen 1992
3. Validity -- Providing Evidence (read de Vaus chapter 4) 4. Factor Analysis (read de Vaus chapter 11) (Spring 2011: through regression sample size )
|
7 | 3/7 |
1. Resume material from chat session 6 2. Illustrate group project analysis steps from data collection to final regression analysis Note to instructor:
|
Note: The material indented with grey background are comments for instructor about content to review for possible incorporation into course. Students should ignore this information.
Assessing reliability and validity of single item measures:
Validity Standards: Validity evidence (Standards Validity Evidence), and these standards (note also steps for questionnaire development): http://nces.ed.gov/StatProg/2002/std2_6.asp
National standards on validity discussion, useful table: http://www.bwgriffin.com/gsu/courses/edur9131/content/validity_new_standards_11539590.pdf
Link between Research Questions and Methods -- (Note to instructor: develop examples; consider design issues)
Add links to on-line statistical programs, e.g.,
Reading Research Reports --- t-tests and ANOVA
From "Instrument Construction Steps" activity: Conley, D. T., & Goldman, P. (1995). Reactions from the field to state restructuring legislation. Educational Administration Quarterly, 31, 512-538.
Note -- Links to possible Reading Research report tables
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur7130/RR_JER_rating_and_learning.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur7130/RR_backgroundmusic.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur9131/infantmentalhealthjournal.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur9131/infantandchilddeveopment.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur9131/journalofchildneurology.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur9131/journalofsocialpsychology.pdf
http://coe.georgiasouthern.edu/foundations/bwgriffin/edur9131/ceprittschofgriffin.pdf
Copyright © 2005, Bryan W. Griffin
Last revised on 18 January, 2018 02:44 PM