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The formulae for the statistical tests in IBM® SPSS® Data Collection Survey Reporter have been specifically developed for the market research industry. The tests differ from the corresponding tests offered in IBM® SPSS® Statistics 10 in two main ways:
• Overlapping data. Survey Reporter allows you to run the column proportions and column means tests on overlapping data. When Survey Reporter detects overlapping data in the columns being tested, it automatically uses a special formula to compensate, known as the overlap adjustment.
• Weighted data. The statistical formulae in SPSS Statistics 10 are designed for data weighted with replication weights, which are normally integer values, whereas the statistical formulae in Survey Reporter are designed for data weighted with sample weights, which are normally non-integer values.