2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/130448This paper modifies a box-counting method of estimating a fractal dimension of a graph, and applies it to estimate the roughness of a sample function of a stochastic process such as a Levy process or a Gaussian process with stationary increments24 pages, 6 figures, LaTexStatistics TheoryProbability90A20, 62M09, 60G17Estimating the p-variation index of a sample function: An application to financial data settext