During the development of IBM® SPSS® Data Collection Survey Reporter, the algorithms for statistical formulae were rewritten, and the revised formulae were reviewed by IBM Corp. statisticians. Although the formulae appear very different to those used in IBM® SPSS® Quantum™ and IBM® SPSS® Quanvert™, tests have shown that they give comparable p values.
This section provides a comparison of the formulae in Survey Reporter and Quantum/Quanvert.
In the column proportions test, where the data are not overlapping, the denominator of t = sqrt(term), where term is
in Survey Reporter:
in Quantum/Quanvert:
Where there is overlap, the denominator of t = sqrt(term), where term is
in Survey Reporter:
in Quantum/Quanvert:
In some cases, slight differences will be seen in your results as borderline cases that are significant using the Survey Reporter formula may not be significant using the Quantum/Quanvert formula.
Degrees of freedom:
in Survey Reporter:
DF = e1 + e2 - e0 - 2
in Quantum/Quanvert:
DF = e1 + e2 - e0 - 1
Customers who want to reproduce the Quantum/Quanvert formula can do this using the Use Quantum/Quanvert column proportions formula option available from the popup box in the Statistics tab of the Table Properties dialog box.
For full details of the Survey Reporter formula, see Statistical Formula for the Column Proportions Test.
Degrees of freedom:
in Survey Reporter:
DF = e1 + e2 - e0 - 2
in Quantum/Quanvert:
DF = e1 + e2 - e0 - 1
Customers who want to reproduce the Quantum/Quanvert formula can do this using the Use Quantum/Quanvert column proportions formula option available from the popup box in the Statistics tab of the Table Properties dialog box.
For full details of the Survey Reporter formula, see Statistical Formula for the Column Means Test.
In the paired preference test, the denominator of t = sqrt(term), where term is
in Survey Reporter:
in Quantum/Quanvert:
where
For full details of the Survey Reporter formula, see Statistical Formula for the Paired Preference Test.
For full details of Quantum and Quanvert formulae, see the Quantum User's Guide or the Quanvert User's Guide.
Kish, L. Survey Sampling. New York: John Wiley and Sons. ISBN 0-471-48900-X.