Markov Chain is suitable for short-termforecast of great capacity sample data sequence, but gray system forecast method is suitable for medium-termforecast of few capacity sample data sequence.
马尔柯夫链适用于大样本数据序列的短期预测，而灰色系统预测方法适用于小样本数据的中期预测。
2
The important cause that ECMWF medium-term numerical forecast made errors in 1998 is that astronomical tide is not included in the model.
不考虑天文潮汐可能是1998年欧洲中期数值预报产生较大误差的重要原因。
3
Hence, Grey forecast Modal has been adopted, appropriate software developed for short-term and medium-term load forecast.