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Notes for online students:

This is the first of a series of lectures on some very basic ideas of quantitative data analysis

Many different statistical software products are available – SAS, S‐PLUS, Stata, R, etc. Excel 
provides some rudimentary capabilities as well.
We’re using SPSS because it’s very easy to use and it’s one of the most popular and 
important tools for statistical analysis
important tools for statistical analysis




                                                                                                   1
2
Notes for online students:

1. Can you give some examples based on your research topic?
2. How do these data differ from one another?
3. And how can these be organized in an SPSS file for quantitative analysis?




                                                                               3
Notes for online students

Give examples of variables: gender, income, frequency of usage, stress, job title
Give examples of cases: Mary, Peter, Project A, Project B, Company Microsoft, Company 
Google

The video is a very good introduction. Be sure to watch it.




                                                                                         4
Notes for online students:

Think about how you might code the data you will collect for your group project
Would you be able to put a number on everything?
What types of data might they be?

More explanations of the different data types are available in your textbook




                                                                                  5
Notes for online students:

This chart is a useful tool to figure out what data type you need




                                                                    6
Notes for online students:

Here is how you might code these data:

1. Gender as a categorical variable: 1= female and 2=male
2. Ice cream flavor as a categorical variable: 1 = mint chocolate, 2 = vanilla, 3 = cookie 
   monster 
3. Customer number as a continuous integer (i.e., no decimal points): 1234, 1235, 1238, 
3 Customer number as a continuous integer (i e no decimal points): 1234 1235 1238
   9999
4. Size as a continuous integer value (i.e., no decimal points): 2, 4, 6, 8, 10
5. “I support Obama” as discrete units (on a 1‐5 Likert scale): 1, 2, 3, 4, 5
6. Temperature as a continuous decimal value: 7.8, ‐2.7




                                                                                              7
8
Measurement in research consists of assigning numbers to empirical events, objects or 
properties, or activities in compliance with a set of rules. This slide illustrates the three‐part 
process of measurement.
Text uses an example of auto show attendance.
A mapping rule is a scheme for assigning numbers to aspects of an empirical event.




                                                                                                      9
Exhibit 11‐1.
•The goal of measurement – of assigning numbers to empirical events in compliance with a 
set of rules – is to provide the highest‐quality, lowest‐error data for testing hypotheses, 
estimation or prediction, or description. 
•The object of measurement is a concept, the symbols we attach to bundles of meaning 
that we hold and share with others. Higher‐level concepts, constructs, are for specialized 
scientific explanatory purposes that are not directly observable and for thinking about and 
communicating abstractions. Concepts and constructs are used at theoretical levels while 
communicating abstractions Concepts and constructs are used at theoretical levels while
variables are used at the empirical level. Variables accept numerals or values for the 
purpose of testing and measurement. 
•An operational definition defines  a variable in terms of specific measurement and testing 
criteria. These are further reviewed in Exhibit 11‐2 on page 341 of the text.




                                                                                               10
This is a good time to ask students to develop a question they could ask that would provide 
only classification of the person answering it.
                 •Classification means that numbers are used to group or sort responses. 
Consider asking students if a number of anything is always an indication of ratio data.  For 
example, what if we ask people how many cookies they eat a day?  What if a business calls 
themselves the “number 1” pizza in town? These questions lead up to the next slide. Does 
the fact that James wears 23 mean he shoots better or plays better defense than the player 
donning jersey number 18?
donning jersey number 18?

In measuring, one devises some mapping rule and then translates the observation of 
property indicants using this rule. 
Mapping rules have four characteristics and these are named in the slide.
•Classification means that numbers are used to group or sort responses. 
•Order means that the numbers are ordered. One number is greater than, less than, or 
equal to another number.
•Distance means that differences between numbers can be measured. 
•Origin means that the number series has a unique origin indicated by the number zero. 
Combinations of these characteristics provide four widely used classifications of 
measurement scales: nominal, ordinal, interval, and ratio.




                                                                                                11
Students will be building their measurement questions from different types of scales. They 
need to know the difference in order to choose the appropriate type. Each scale type has 
its own characteristics.




                                                                                              12
•Nominal scales collect information on a variable that can be grouped into categories that 
are mutually exclusive and collectively exhaustive. For example, symphony patrons could 
be classified by whether or not they had attended prior performances.
•The counting of members in each group is the only possible arithmetic operation when a 
nominal scale is employed. If we use numerical symbols within our mapping rule to identify 
categories, these numbers are recognized as labels only and have no quantitative value. 
•Nominal scales are the least powerful of the four data types. They suggest no order or 
distance relationship and have no arithmetic origin. The researcher is restricted to use of 
distance relationship and have no arithmetic origin The researcher is restricted to use of
the mode as a measure of central tendency. The mode is the most frequently occurring 
value. There is no generally used measure of dispersion for nominal scales. Dispersion 
describes how scores cluster or scatter in a distribution. 
Even though LeBron James wears #23, it doesn’t mean that he is better player than #24 or 
a worse player than #22. The number has no meaning other than identifying James for 
someone who doesn’t follow the Cavs.




                                                                                               13
•Order means that the numbers are ordered. One number is greater than, less than, or 
equal to another number.
You can ask students to develop a question that allows them to order the responses as well 
as group them.  This is the perfect place to talk about the possible confusion that may exist 
when people order objects but the order may be the only consistent criteria. For instance, 
if two people tell them that Pizza Hut is better than Papa Johns, they are not necessarily 
thinking precisely the same. One could really favor Pizza Hut and never considering eating 
another Papa John s pizza, which another could consider them almost interchangeable with 
another Papa John’s pizza which another could consider them almost interchangeable with
only a slight preference for Pizza Hut.  This discussion is a perfect lead in to the ever 
confusing ‘terror alert’ scale (shown on the next slide)…or the ‘weather warning’ system 
used in some states to keep drivers off the roads during poor weather.  Students can 
probably come up with numerous other ordinal scales used in their environment.




                                                                                                 14
•Ordinal data require conformity to a logical postulate, which states: 
                 •If a is greater than b, and 
                 •b is greater than c, then 
                 •a is greater than c. 
•Rankings are examples of ordinal scales. Attitude and preference scales are also ordinal. 
•The appropriate measure of central tendency is the median. The median is the midpoint 
of a distribution. A percentile or quartile reveals the dispersion. 
•Nonparametric tests should be used with nominal and ordinal data. This is due to their 
•Nonparametric tests should be used with nominal and ordinal data This is due to their
simplicity, statistical power, and lack of requirements to accept the assumptions of 
parametric testing.




                                                                                              15
In measuring, one devises some mapping rule and then translates the observation of 
property indicants using this rule. 
Mapping rules have four characteristics and these are named in the slide.
•Classification means that numbers are used to group or sort responses. 
•Order means that the numbers are ordered. One number is greater than, less than, or 
equal to another number.
•Distance means that differences between numbers can be measured. 
•Origin means that the number series has a unique origin indicated by the number zero. 
•Origin means that the number series has a unique origin indicated by the number zero
Combinations of these characteristics provide four widely used classifications of 
measurement scales: nominal, ordinal, interval, and ratio.




                                                                                          16
Researchers treat many attitude scales as interval (this will be illustrated in the next 
chapter). 
•When a scale is interval and the data are relatively symmetric with one mode, one can use 
the arithmetic mean as the measure of central tendency. The standard deviation is the 
measure of dispersion. 
•The product‐moment correlation, t‐tests, F‐tests, and other parametric tests are the 
statistical procedures of choice for interval data. 




                                                                                              17
In measuring, one devises some mapping rule and then translates the observation of 
property indicants using this rule. 
Mapping rules have four characteristics and these are named in the slide.
               •Classification means that numbers are used to group or sort responses. 
               •Order means that the numbers are ordered. One number is greater than, 
               less than, or equal to another number.
               •Distance means that differences between numbers can be measured. 
               •Origin means that the number series has a unique origin indicated by the 
               •Origin means that the number series has a unique origin indicated by the
               number zero. 
Combinations of these characteristics provide four widely used classifications of 
measurement scales: nominal, ordinal, interval, and ratio.




                                                                                            18
Examples
E    l
       Weight
       Height
       Number of children
       N b     f hild
•Ratio data represent the actual amounts of a variable. 
•In business research, there are many examples such as monetary values, population 
counts, distances, return rates, and amounts of time. 
•All statistical techniques mentioned up to this point are usable with ratio scales. 
Geometric and harmonic means are measures of central tendency and coefficients of 
variation may also be calculated. 
•Higher levels of measurement generally yield more information and are appropriate for 
more powerful statistical procedures. 




                                                                                          19

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