We report ranges because different specifications of value - added models yield different correlations. (carnegieknowledgenetwork.org)
Different correlation coefficients between investments is why asset allocation works much better for sane rational individual investors than anything else ever invented. (toolsformoney.com)
Namely, the authors represent different correlations between common features of MOOCs and specific pedagogical benefits these features lead to: (elearningindustry.com)