Altmetrics to quantify impact of research published in open full text repositories

Scatter plot of usage data from hprints.org: Blue diamonds are the number full text downloads (Nd) as a function of the number of page views (Nv). Red squares correspond to the lower limit of ln (d) = 0 and the green triangles to the upper limit of ln (d) = 0, with d = Nd/ Nv * Nd.