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Chapter 2: Variable Coding and Data Quality (pp 12-18), this is p. 18
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when easy resolution of problems seemed out of reach. Therefore, our consultants should not be held responsible for any errors of fact or interpretaion which remain in the sections they reviewed. Despite errors that certainly remain in unknown places throughout this considerable body of material, the quality of the published information was greatly improved by the numerous major and countless minor contributions from our outside experts. Much of whatever merit resides in these data should be credited to their careful reviews and constructive criticisms of our handiwork.

Ultimately, the quality of any data set depends on measurement validity, not only reliability. But validity in political research is not so easily determined. Chapter 14 attempts to evaluate the validity of our measurement by analyzing the interrelationships among the basic variables underlying the framework's major concepts. More convincing evidence of measurement validity, however, requires extensive data analysis while testing substantive party theory. Although such research lies beyond the scope of this book, it is the reason for the book's existence.

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