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Discovering Statistics Using IBM SPSS Statistics: North American Edition, by Andy Field

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The z-statistic was developed by Abraham Wald (Figure 20.2), and is known as the Wald statistic. SPSS Statistics reports the Wald statistic as z2, which transforms it so that it has a chi-square distribution.
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Discovering Statistics Using IBM SPSS Statistics: North American Edition
Discovering Statistics Using IBM SPSS Statistics: North American Edition
by Andy Field
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