ISBN-13: 9780313254260 / Angielski / Twarda / 1989 / 344 str.
Polls are at their best as indicators of public opinion when they allow comparison over extended periods of time. Yet all too often changes in question working and in questionnaire content make over-time comparisons impossible. This works aims to overcome this difficulty by bringing together a compendium of results using identically worded questions on a range of social, political and economic topics of importance to the American people.