which is used to find the difference between a forecast and a weather forecast? what is the variable of forecast's error what's the relationship between variable forecast error and forecast variable? variance of forecast's error what is variances in forecast vs error what is the variable of forecast's error what is variance of forecast error what is the forecast error what is the difference between forecast error and time series variance what is the variation of forecast error textvar d_t-f_t= what is forecast error and variance variance of forecast's error what is variance of forecast variance of forecast errors variance of forecast's error variable of forecast's error definition is there any situation in which $$textvar(d_t-f_t)=textvar(d_t)+textvar(f_t)-textcov(d_t,f_t)$ can be used what is the variable of forecast error in the f t variance of forecast's error example