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A new pre-averaging\/kernel estimator for spot volatility is also introduced to handle the microstructure noise of ultra high-frequency observations. A CLT for the estimation error of the new estimator is obtained, and the optimal selection of the bandwidth and kernel function is subsequently studied. It is shown that the pre-averaging\/kernel estimator\u2019s asymptotic variance is minimal for two-sided exponential kernels, hence justifying the need of working with kernels of unbounded support. Feasible implementation of the proposed estimators with optimal bandwidth is developed as well. Monte Carlo experiments confirm the superior performance of the new method.<\/jats:p>","DOI":"10.1017\/s0266466622000470","type":"journal-article","created":{"date-parts":[[2022,10,18]],"date-time":"2022-10-18T07:17:53Z","timestamp":1666077473000},"page":"558-607","source":"Crossref","is-referenced-by-count":11,"title":["KERNEL ESTIMATION OF SPOT VOLATILITY WITH MICROSTRUCTURE NOISE USING PRE-AVERAGING"],"prefix":"10.1017","volume":"40","author":[{"given":"Jos\u00e9 E.","family":"Figueroa-L\u00f3pez","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bei","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2022,10,18]]},"reference":[{"key":"S0266466622000470_r32","doi-asserted-by":"publisher","DOI":"10.1214\/aoms\/1177728190"},{"key":"S0266466622000470_r18","doi-asserted-by":"publisher","DOI":"10.1214\/09-AOS756"},{"key":"S0266466622000470_r15","doi-asserted-by":"publisher","DOI":"10.1093\/jjfinec\/nbi025"},{"key":"S0266466622000470_r24","doi-asserted-by":"crossref","first-page":"36","DOI":"10.1016\/j.jeconom.2017.01.010","article-title":"Adaptive estimation of continuous-time regression models using high-frequency data","volume":"200","author":"Li","year":"2017","journal-title":"Journal of Econometrics"},{"key":"S0266466622000470_r12","doi-asserted-by":"crossref","unstructured":"Figueroa-L\u00f3pez, J.E. & Wu, B. 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