【多选题】Forecasts based solely on the most recent observation(s) of the variable of interest
A.
are called “naive” forecasts.
B.
are the simplest of all quantitative forecasting methods.
C.
leads to loss of one data point in the forecast series relative to the original series.
D.
are consistent with the “random walk” hypothesis in finance, which states that the optimal forecast of today's stock rate of return is yesterday's actual rate of return.