【简答题】【消耗次数：1】
若时间序列有18年的数据，采用3年移动平均，修匀后的时间序列中剩下的数据有[填空]个。
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相关题目
【简答题】
若时间序列有18年的数据，采用3年移动平均，修匀后的时间序列中剩下的数据有[填空]个。
【多选题】
采用移动平均法对时间数列修匀后所得到的一个新的时间数列,以下哪些说法正确？
①
是由一般平均数组成的
②
是由序时平均数组成的
③
项数一定少于原数列
④
其基本发展趋势同原数列不一致
⑤
其基本发展趋势同原数列一致
【单选题】
用移动平均法修匀时间数列时，在确定平均的项数时
①
必须考虑现象有无周期性变动
②
不必须考虑现象有无周期性变动
③
可以考虑也可以不考虑周期性变动
④
平均的项数必须是奇数
【单选题】
在应用一次移动平均法对时间序列预测中，下列哪一种说法正确（）
①
n取的越大，对时间序列修复越强
②
第一移动平均值放在时间序列的末端
③
时间序列波动很大的情况下
④
以上都不正确
随机题目
【单选题】
7.He looked around and caught a man____his hand into the pocket of a passenger.
①
put
②
to be put
③
to put
④
putting
【单选题】
14.The thief fell to the ground，his left foot ____and blood ____down from his mouth.
①
breaking; running
②
broken; running
③
breaking; run
④
broken; run
【单选题】
18.- Did you get a dictionary?- No, I _____, but there were not any _____.
①
tried; to be left
②
had tried to; leaving
③
tried to; left
④
had tried; have left
【单选题】
4.____the diamond, he had to look for a place to hide it.
①
Having stolen
②
Having been stolen
③
Stolen
④
Stealing
【单选题】
12.You can’t imagine what great trouble they have ____the problem____.
①
to solve; being talked about
②
solving; discussing
③
to solve; to talk about
④
solving; being discussed
【单选题】
6.And there, almost____in the big chair, sat her little brother, who never had to be told to keep quiet.
①
having lost
②
losing
③
to be lost
④
lost
【单选题】
17.____, the subject was always in my mind.
①
Walking or sleeping
②
Walking or slept
③
Having walked or slept
④
To walk and sleep
【单选题】
20. The joke told by Tom made us_____, so our maths teacher couldn’t make himself _____.
①
to laugh; hearing
②
laughing, heard
③
laughing; hear
④
laughed; heard
【单选题】
15.The program was so exciting that the children kept their eyes ____on the screen.
①
to fix
②
to be fixed
③
fixed
④
fixing
【单选题】
10.In January, 2004, the United States successfully launched “spirit”, a Mars Exploration Rover, _____ a new milestone in the history of mankind.
①
it marked
②
marking
③
marked
④
to mark