Download CHAPTER 11 CHI-SQUARE: NON-PARAMETRIC COMPARISONS

CHAPTER 11
CHI-SQUARE: NON-PARAMETRIC COMPARISONS OF FREQUENCY
The hypothesis testing statistics detailed thus far in this text have all been designed to
allow comparison of the means of two or more samples to determine if they are significantly
different from each other. Such comparisons can only be conducted when the researcher has
interval level data. While the use of interval level data is preferred by most researchers
because it provides a more precise measurement of the phenomena under consideration, it is
often impossible to obtain. Researchers must then turn to another set of statistical tools that
allow the testing of hypotheses using nominal and ordinal data. These tools are referred to in
the field of statistics as non-parametric tests. A parameter is a quantity which is constant
for a given population. Parameters can also be defined as numerical descriptive measures of
a population. Two major parameters already explained in earlier chapters are measures of
central tendency and variability. For example, the mean is a parameter which describes an
entire distribution of values. Obviously, these parameters cannot be obtained for nominal and
ordinal data. It follows then that statistics not dependent on calculating measures of central
tendency or variability are non-parametric. However, this is not to say that parameters are
not studied when using non-parametric statistics. One just does not know or make
assumptions about any specific values of a parameter. Statisticians generally refer to T-tests
and ANOVA tests as parametric statistics.
This chapter introduces and explains the use of Chi-Square, used to test hypotheses
involving nominal data, while the next is devoted to a statistic called Mann-Whitney U which
is employed for hypothesis testing when working with ordinal measures. It should be pointed
out by way of a cautionary note that statistics designed to test hypotheses for nominal and
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ordinal data are no better than the data which they are designed to analyze. Interval data are
more precise and accurate. The lower level of precision possible using nominal or ordinal
measures makes the non-parametric statistics are somewhat less accurate for hypothesis
testing. This limitation is partially addressed through the use of more stringent demands for
statistical significance when non-parametric statistics are used.
CHI-SQUARE
The most frequently used non-parametric statistic for testing hypotheses with nominal
data is Chi-Square. The nature of nominal data as explained in chapter one involves
assigning data to mutual exclusive categories, labeling, or naming the data. Nominal data are
most generally analyzed by frequency of occurrence. The non-parametric statistic ChiSquare is a comparison of relative frequencies among two or more groups. The null
hypothesis for Chi-Square is that there is no statistically significant difference in the relative
frequency of one outcome over another. For example, a possible null hypothesis might be that
there is no statistically significant difference in the relative frequency of Hispanics failing
their first math course in college and the relative frequency of Whites failing their first math
course. In other words, there is no statistical difference between the two groups as measured
by frequency of failure. Nominal data for testing this hypothesis can be organized in a twoby-two data matrix containing two rows and two columns for pass-fail categories and by
group. This approach to organization is shown for a sample of 100 Hispanics and a sample of
100 Whites in Figure 11:1.
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FIGURE 11:1
Pass
Fail
Total
Whites
50
50
100
Hispanics
50
50
100
100
100
200
Total
In this example, the null hypothesis would be accepted because one can simply observe that
there is no difference between Hispanics and Whites. The frequencies of pass or fail rates are
the same for both groups. No statistics are necessary for nominal data equally distributed
between groups, but not all frequencies are this simple. Generally, decisions relative to
accepting and rejecting null hypotheses require far more complex analyses because differences
between samples do occur. Whether or not these differences are sufficient to suggest a
statistically significant difference in the overall populations is the reason for conducting
statistical tests.
Calculation of the Chi-Square statistic is basically a comparison between observed and
expected frequencies. Observed frequencies are actual nominal data for each characteristic
under consideration by the researcher. In the above example, one observes that fifty Whites
and Hispanics failed and fifty Whites and Hispanics passed. The expected frequencies are
the nominal data results one would expect to find if the null hypothesis is to be accepted. In
the above example, one would expect the proportion of pass and fail frequencies for Whites
and Hispanics to be the same. The theory behind the Chi-Square statistic is that if the
difference between the observed and expected frequencies is large, that even with assumed
sampling error, the null hypothesis is rejected. One would conclude that a statistically
significant difference between two or more groups does exist. By implication, this also means
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that not all differences between observed and expected frequencies are significant, some are
the result of sampling error or too small to be significant.
The formula for calculating the Chi-Square statistic is:
Where:
the observed frequencies for each position in the matrix
the expected frequencies for each position in the matrix
Calculation of the Chi-Square statistic is a simple process involving the use of a solution
matrix. For example, suppose a researcher wanted to test the difference between frequencies
of high or low incomes for men and women in the same profession. A research question
could be stated as follows: Do male lawyers have higher incomes than female lawyers? The
null hypothesis might be stated as follows: There is no statistically significant difference
between the frequencies of the high and low incomes for males and the frequencies of the high
and low incomes for females.
Organizing the solution matrix for the Chi-Square statistic is simple and easy. First,
the data are organized by row and column in the form of a data matrix. The actual or observed
values for each place in the data matrix are recorded. Then the values in each rows and
column are totaled and the total number of cases under consideration (n) is determined. The
solution matrix will vary in size depending on the number of rows and columns needed to
display the observed frequencies. In figure 11:2 the following data matrix was constructed
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using the observed frequencies of high and low incomes (nominal) for men and women
(nominal) are displayed in a 2 x 2 data matrix.
Figure 11:2: DATA MATRIX
Men
High Income
15
25
(19.66)
(20.34)
Low Income
Total
Women
14
5
(9.34)
(9.66)
29
30
Total
40
19
59
Once the data matrix has been constructed, the expected frequencies for each cell in the matrix
can be determined using the formula:
For example, row 1 and column 1 square of the matrix, which represents high income men,
the calculation of the expected frequency is:
Row 1 column 2 is calculated:
Expected frequencies are similarly obtained for all of the squares of the data matrix and
included in parentheses within the data matrix immediately below the observed values. When
the expected frequencies have been calculated, the remaining Chi-Square calculations are
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simple mathematics.
Solution Matrix for
Row
Column
1
1
15
19.66
-4.66
21.72
1.10
1
2
25
20.34
4.66
21.72
1.07
2
1
14
9.34
4.66
21.72
2.33
2
2
5
9.66
-4.66
21.72
2.25
The value of the Chi-Square statistic is 6.75. The next step in the process of testing the
hypothesis requires that the degrees of freedom be determined. The simple formula for finding
the degrees of freedom for P2 is:
d.f. = (Total Rows - 1) (Total Columns - 1)
In the context of the present example, df= (2-1)(2-1)=1(1)=1
By consulting the table in Appendix H the critical values for P2 at .05 and .01 are
3.84 and 6.63 for 1 degree of freedom. The researcher compares the obtained value for P2
with the critical value to determine if the observed difference in frequencies is statistically
significant. The null hypothesis is rejected at both the .05 and .01 levels At the 95% and 99%
confidence levels in this case because the obtained value is higher than either of the critical
values from Appendix H. Therefore, the researcher must conclude that there is a statistically
significant difference between the relative frequencies of high and low incomes for men and
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women. Even allowing for the presence of sampling error, the value of P2 is large enough to
suggest that a real difference exists between the populations represented by these samples. In
this example, the research conclusion is that the female lawyers have higher incomes than
male lawyers. A very useful rule for accepting or rejecting the null hypothesis for P2 is as
follows:
Accept null if the obtained P2 is less than the critical values in the P2 table. Reject the
null hypothesis if the obtained P2 is equal to or greater than the critical values in the P2
table.1
Under certain circumstances when working with a 2x2 data matrix, the formula used to
calculate the Chi-Square statistic is adjusted slightly. This process is utilized when any of the
expected frequencies within the data matrix are lower than 10. The alternative Chi-Square
formula is known as the Yates' Correction. When expected frequencies are this low,
researchers have determined that it is appropriate to make the standard for rejecting the null
hypothesis more stringent by subtracting .5 from the absolute value of the difference between
each observed and expected frequency before the differences are squared. The formula for
Chi-Square using Yate’s Correction is as follows:
Applying this correction requires an additional column in the solution matrix and the
1
The critical values are “critical” because they are the basis for accepting or rejecting the null
hypothesis. Since Chi-Square is a statistic based on nom inal data, the obtained Chi-Square m ust be
larger than these critical values in the table for a significant difference in the frequencies.
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correction will also reduce the size of Chi-Square. The reduction is an effort to be more
conservative and reduce the probability of making the alpha error. The comparison of
frequencies of men and women in high and low income categories earlier in the chapter
provides an example of a context in which Yate’s Correction is to be applied. Compare the
solution matrix using Yate’s Correction presented in figure 11:3 below with the one produced
earlier. Notice the difference in the value of Chi-Square and the difference in statistical
conclusions required when the Yate’s Correction is employed.
FIGURE 11:3: YATE’S CORRECTION
Men
High Income
15
25
(19.66)
(20.34)
Low Income
Total
Women
14
5
(9.34)
(9.66)
29
30
Total
40
19
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Row
Column
1
1
15
19.66
-4.66
4.16
17.31
.88
1
2
25
20.34
4.66
4.16
17.31
.85
2
1
14
9.34
4.66
4.16
17.31
1.85
2
2
5
9.66
-4.66
4.16
17.31
1.79
The obtained value for Chi-Square is 5.37 which is still significant at the .05 level but which
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is no longer significant at the .01 level.
In summation, the Chi-Square statistic is used to test hypotheses by comparing
observed and expected frequencies of a characteristic for two or more groups. Chi-Square is
not limited to the comparison of two samples. One may have a 5 x 5, 10 x 10, 7 x 10, or any
size data matrix for many independent samples. Unlike the t test, Chi-Square is not used for
dependent samples. In addition, Chi-Square is used only for nominal data, and a researcher
should make use of Yates' Correction when it applies.
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EXERCISES - CHAPTER 10
(1)
A researcher wants to determine whether students who had taken a driver’s education
course sponsored by the school passed their state driver’s examination with a higher relative
frequency than those who did not take the class. Using the data provided in the 2x2 matrix
below and Yate’s Correction:
A.
Write a null hypothesis
B.
Calculate the value for Chi-Square
C.
Draw statistical and research conclusions
Taken Driver’s Education
Test Result
No
Total
Pas
14
6
20
Fail
5
10
15
19
16
35
Total
(2)
Yes
In a poll of New York residents, the following results were recorded with
reference to political ideology and party affiliations. For 65 Republicans: 20
conservative, 35 liberal, and 10 neither. For 120 Democrats: 40 conservative, 70
liberal, and 10 neither. Test a null hypothesis for these data and draw statistical
conclusions.
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