Soley, F.J2024-04-162024-04-161987Soley, F.J. (1987). Statistical significance of a weak spectral peak using filtering techniques: a case study. Ciencia y Tecnología, 11(1), 5-14. https://www.kerwa.ucr.ac.cr/bitstream/handle/10669/644/1987_1.pdf?isAllowed=y&sequence=1https://daki.cigefi.ucr.ac.cr/handle/123456789/28Filtering techniques are applied to geopotential series at the 850, 700 and 300 hPa levels at Howard Base, Panama to determine if the weak spectral peak near a frequency of 0.25/day can be considered real or noto An ARMA bandpass filter and a pole cancelling method are applied to the data. Statistical tests suitable to filtered series are applied and it is determined that the hypothesis that the peaks are real is not supported.enArticle