scedasticity meaning in English

方差性
离中趋势

Optimization model of networks " roughness is established . in this model , objective function is the average scedasticity of relative error for water level and discharge . with the recorded water level and tidal data , the value of roughness is optimized
建立了以流量和水位相对均方差作为目标函数的河网糙率优化模型，并利用实测的河道水位及潮流资料，对河道的糙率取值进行了优化，所建立的糙率优化模型更加合理，计算的效率及精度大大提高了。