The second in a series of four seminars presented to University of North Texas librarians. This presentation focuses on organizing and presenting basic descriptive statistics, including measures of central tendency and variation.
5. SCALES OF DATA (NOIR)
Nominal
•Counts by category
•Binary (Yes/No)
•No meaning
between the
categories (Blue is
not better than
Red)
Ordinal
•Ranks
•Scales
•Space between
ranks is subjective
Interval
•Integers
•Zero is just another
value – doesn’t
mean “absence
of”
•Space between
values is equal and
objective, but
discrete
Ratio
•Interval data with a
baseline
•Zero (0) means
“absence of”
•Space between is
continuous
•Includes simple
counts
6. ANOTHER WAY
• Counts by Categories
• Ranks
• Scales
Qualitative
• Measurements
• Composite scores
• Simple Counts
Quantitative
8. RESEARCH QUESTION
Does UNT Libraries
provide access to the
resources used by PACS
faculty, based on
references in their
published works?
9. PACS STUDY VARIABLES
•Department
•Years at UNTFaculty
•# published by type
•Rankings of journalsPublished
•# cited by type
•Rankings of journals
•UNT accessible
Cited
IV
DV
10. PACS STUDY VARIABLES BY SCALE
•# of publications by
type
•# of citations by type
•# references available
Qualitative
•Years at UNT
•Years since PhD
Quantitative
14. TABLES
Department
Num
Faculty
% of
Faculty
Anthropology 20 18%
Behavior Analysis 17 15%
Criminal Justice 18 16%
Public Administration 19 17%
Rehab, Social Work, &
Addictions 18 16%
Sociology 21 19%
Totals 113 100%
Department Article
%
Articles Other
Anthropology 73 61% 46
Behavior Analysis 65 81% 15
Criminal Justice 54 69% 24
Public Administration 64 58% 47
Rehabilitation, Social
Work, and Addictions 49 82% 11
Sociology 83 62% 50
Totals 388 67% 193
Availability # Refs %
Available 586 79.62%
Title not avail 134 17.66%
Year not avail 23 2.72%
Grand Total 743 100.00%
15. Department Article Article % Book Book % Other Total
Anthropology 1152 666 2012
Behavior Analysis 1412 289 1740
Criminal Justice 1220 624 2003
Public
Administration 966 561 1724
Rehabilitation,
Social Work, and
Addictions 852 365 1282
Sociology 2238 1558 3970
Totals
Department Article Article % Book Book % Other Total
Anthropology 1152 57% 666 33% 194 2012
Behavior Analysis 1412 81% 289 17% 39 1740
Criminal Justice 1220 61% 624 31% 159 2003
Public
Administration 966 56% 561 33% 197 1724
Rehabilitation,
Social Work, and
Addictions 852 66% 365 28% 65 1282
Sociology 2238 56% 1558 39% 174 3970
Totals 7840 (avg) 63% 4063 30% 828 12731
ACTIVITY 1
16. GRAPHS
0%
20%
40%
60%
80%
100%
% Articles by Department
Anthropology
Behavior Analysis
Criminal
Justice
Public
Administration
Rehabilitation,
Social Work, and
Addictions
Sociology
% of Faculty
17. GRAPH & CHART RULES OF THUMB
Trends
Connection
across the X-
axis
Categorical
Comparisons
Grouped
Stacked
Relative
Stacked
Categorical
Few
Categories
Differences
are Wide
18. ACTIVITY 2
Draw a bar graph of References by Type
Department Article Article % Book Book % Other Total
Anthropology 1152 57% 666 33% 194 2012
Behavior Analysis 1412 81% 289 17% 39 1740
Criminal Justice 1220 61% 624 31% 159 2003
Public Administration 966 56% 561 33% 197 1724
Rehabilitation, Social
Work, and Addictions 852 66% 365 28% 65 1282
Sociology 2238 56% 1558 39% 174 3970
Totals 7840 (avg) 63% 4063 30% 828 12731
0
1000
2000
3000
4000
5000
Other
Book
Article
20. EXPLORATORY DATA ANALYSIS
• John W. Tukey
• Exploratory Data
Analysis
• Examining your data
visually.
• Stem & Leaf
• Hinges
• Box plots
• Scatter plots, etc.
37. PRESENTATION
OF SPREAD
• Box plots
• Median
• Upper & lower
quintiles
• Outliers
• Cross-tabulations
• Bar graphs
38. BOXPLOT IN EXCEL
Set parameters
•Median
•Quartile 1
•Minimum
•Maximum
•Quartile 3
Use Excel
functions
•Median(range)
•Quartile.inc(range,1)
•Min(range)
•Max(range)
•Quartile.inc(range,3)
Insert Chart
•Highlight both
columns
•Select a bar
chart
•Switch the
columns & rows
•Modify the
formats of each
element
•YouTube tutorial
55. PROGRESSION FROM DESCRIPTIVE TO
INFERENTIAL STATISTICS
Central
Tendency
Spread
Distributions
Probability
Inferential
Statistics
56. RESOURCES
Rice Virtual Lab in
Statistics
Excel Tutorials for
Statistical Analysis
Khan Academy -
videos
Basic Research
Methods for
Librarians – ebook
Descriptive Statistical
Techniques for
Librarians - ebook