HIGHLIGHTS
SUMMARY
Data integration is not new to survey researchers, who have already combined surveys based on probability-based samples (PS) with auxiliary data from censuses or administrative registers to enhance inference. Starting from the 2000s, volunteer web surveys and_(big) digital trace data (textual data from social media, Google searches and maps, sensor data, etc.) have become popular data sources that can potentially replace or be integrated with traditional PS surveys. The frontier of data integration and inference relates to three relatively new data sources: volunteer web surveys, big or digital trace data, and mobile . . .
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