How to Choose Appropriate Statistic

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How to Use Bill Trochim’s Program for Choosing
An Appropriate Statistic

• Probably the most complete system for choosing
appropriate statistics when researcher has “raw” data can
be found at:
• Bill Trochim – Cornell University – Center for Social
Research – Statistics Selector
• http://trochim.human.cornell.edu/selstat/ssstart.htm
Flaschner’s Procedure

• State Number of Variables
– One
– Two
– Three
One Variable
• Compute Descriptive Statistics
– Depends on Level of Measurement

• Test if Statistic is significantly different
from corresponding population Parameter
– One Sample
– Depends on Level of Measurement
Verification in Choosing
Tests

Verification for
Two Variables
• Calculate Measure of Association
– Probable Change in Y occurs due to change in
X
Measures of Association

Measures of Association
Test for Differences
• Between
–   Frequencies      – Variances
–   Proportions      – Standard Deviations
–   Medians          – Correlations
–   Means            – b’s
B’s
Difference Between Means
• Size of smallest sample
• Test of independence
– Contingency Coefficient - C
• Test for differences between variances
Verification in Choosing
Tests

Verification in
Possible Statistics Using Excel’s Tools/Data
Anova: Single Factor
Anova: Two-Factor With Replication
Anova: Two-Factor Without Replication
Correlation                      Regression
Covariance                       Sampling
Descriptive Statistics           T-Test: Paired Sample for Means
Exponential Smoothing            T-Test: Two-Sample Assuming
F-Test Two-Sample for Variances         Equal Variances
Fourier Analysis                 T-Test: Two-Sample Assuming
Histogram                               Unequal Variances
Moving Average                   Z-Test: Two Sample for Means
Random Number Generation
Rank and Percentile
Possible Statistics Using SPSS
Verification
• What path do I follow to be
allowed to calculate the
statistics in which I have an
interest?

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 views: 10 posted: 1/14/2010 language: English pages: 13