TY - JOUR T1 - Persistent Interest Portfolios: <em>Marrying Web Search Data with Mean–Variance Theory</em> JF - The Journal of Investing SP - 135 LP - 141 DO - 10.3905/joi.2016.25.3.135 VL - 25 IS - 3 AU - Daniel Nadler AU - Anatoly B. Schmidt Y1 - 2016/08/31 UR - https://pm-research.com/content/25/3/135.abstract N2 - Using Web search data obtained with Google Trends, the authors find that some companies among the S&amp;P 500 Index constituents have persistently high search scores. Many of these companies provide consumer products/services. Mean–variance-optimal portfolios composed of these companies significantly outperform the S&amp;P 500 Index and the consumer-related exchange-traded funds over the 2009–2015 period. The authors conclude that the information from Web searches may be helpful for identifying optimal portfolios.TOPICS: Exchange-traded funds and applications, statistical methods ER -