National Neighborhood Data Archive (NaNDA): Code for merging ZCTA level datasets with the UDS Mapper ZIP code to ZCTA crosswalk

NaNDA contains some datasets that measure neighborhood context at the ZIP Code Tabulation Area (ZCTA) level. They are intended for use with survey or other individual-level data containing ZIP codes. Because ZIP codes do not exactly match ZIP code tabulation areas, a crosswalk is required to use ZIP-code-level geocoded datasets with ZCTA-level datasets from NaNDA. A ZIP-code-to-ZCTA crosswalk is available on the UDS Mapper website at https://udsmapper.org/zip-code-to-zcta-crosswalk/.<br><br>The sample SAS and Stata code provided here merges the UDS Mapper crosswalk with NaNDA datasets. <br>

NaNDA 包含多套以邮政编码制表区域（ZIP Code Tabulation Area，ZCTA）为统计粒度的邻里环境测度数据集。此类数据集可与搭载邮政编码信息的调查数据或其他个体层级数据配合使用。由于邮政编码与ZCTA无法完全匹配，若需将邮政编码级地理编码数据集与NaNDA的ZCTA级数据集结合分析，需借助交叉映射表（crosswalk）。邮政编码至ZCTA的交叉映射表可于UDS Mapper官方网站（https://udsmapper.org/zip-code-to-zcta-crosswalk/）获取。

本文提供的统计分析系统（SAS）与Stata示例代码，可实现UDS Mapper交叉映射表与NaNDA数据集的合并关联。