The time series is mainly divided into absolute number time series, relative number time series and ( ). A: Period series B: Time-point series C: Chronological series D: Average time series

at the end of a period of time or a series of events

‍Which of the following conclusion is wrong?​ A: For the target with better effect value, the time series of situation effect with attenuation must be given priority; B: For the target with smaller value, the increasing situation effect time series should be excluded in the discussion; C: For the target with moderate effect value, the time series of effect of growth situation is discussed; D: For the target with moderate effect value, the time series of effect of attenuation situation is discussed;

中国大学MOOC: Speeches arranged _______ follow a time pattern. They may narrate a series of events in the sequence in which they happened.

If is an economic factor, is time factor, is the observation data of factor at time , then is: A: A. Time series of economic behavior B: B. Economic behavior index sequence C: C. Economic behavior sector sequence D: D. Horizontal sequence of economic behavior

如果定义函数计算调和级数之和;series::Int-Float用series n表示[img=242x25]1803c461290438b.png[/img]，那么如何用series 表示[img=191x25]1803c46130ff710.png[/img]？ A: series n-1 B: series (n-1) C: series 1 + series 2 + ... + series (n-1) D: series (1+1/2+..+ 1/n-1)

Time series and variable series（ ）. A: Are arranged in chronological order B: Are arranged according to the size of the variable value C: The former is arranged according to chronological order, the latter is arranged according to the size of the variable value D: The former is arranged according to the size of the variable value, the latter is arranged according to the chronological order

Which of the followings are correct about difference-in-difference(DID) quasi-experiment study? A: time series data can be used for DID analysis B: panel data can be used for DID analysis C: DID analysis compares the changes over time in an outcome of the treatment group to changes over the same time period in the outcome of the control group. D: DID analysis is the changes over time in an outcome of the treatment group

下列关于Series说法正确的是（） A: Series是一个类似一维数组的对象 B: Series可以保存任何类型的数据 C: Series由数据和索引构成 D: Series结构的数据位于索引的左侧

a series of lectures