ABC News/Washington Post Pre-Super Tuesday Poll, January 2008

ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection: Standardized missing values.; Created online analysis version with question text.; Performed recodes and/or calculated derived variables.; Checked for undocumented or out-of-range codes..

ICPSR（校际政治与社会研究联盟，Inter-university Consortium for Political and Social Research）管理的数据集均需接受保密审查，并会在必要时进行修改以降低数据披露风险。ICPSR还会常规生成即用型数据文件，配套提供主流统计软件格式的程序设置文件，以及随数据一同发布的标准代码手册。除上述流程外，ICPSR还针对本次数据集采集执行了以下处理步骤：标准化缺失值处理；创建附带问卷题文本的在线分析版本；执行重编码及/或计算衍生变量；核查未标注代码与超限代码。