Intro

Question 1

Bigdata- statistics
3V?

Answer 1

3V －volume, velocity, variety
Volume - the amount of available data
Velocity- the speed of collecting and processing data
Variety -different data types.

Question 2

What can big data do?

Answer 2

Hold great promises for understanding
Commonality: in the presence of large variations. (Noises)
Heterogeneity: personalized medicine or services.

Question 3

Applications in business and economics

Answer 3

Accounting会计
Finance金融
Economics经济
Marketing（营销）
Operation(运营)
Information systems信息系统

Question 4

What is average?
What is average for?

Answer 4

Average is mean median, mode
Average is for to measure the central tendency

Question 5

Mean, mode, median?

Answer 5

Arithmetic mean,
Mode is most frequent value in the data set
Median is middle value that separates the higher half from the lower half

Question 6

Data is raw facts and figures

Answer 6

Categorical(qualitative)- nominal, ordinal scale
Quantitative- interval, ratio scale

Question 7

Simpson’s paradox

Answer 7

There is trend in several different sets of data, but when these data sets are combined, this trend disappears or reverses.
Confounding variables: because school is a hidden variable that cannot be ignored.

Question 8

累积分布的类似(cumulative distribution )

Answer 8

Cumulative frequency(累积频数)
Cumulative relative frequency(累积相对频数)
Cumulative percent frequency(累积百分频数)

Question 9

累积分布是？

Answer 9

Cumulative frequency: buleg buriiin deed hyzgaartai tentsuu buyu tuunees baga zuilsiin toog haruuln
Cumulative relative frequency: buleg buriin deed hyzgaartai tentsuu buyu tuunees baga zuilsiin haritsangui davtamjiig haruuln
Cumulative percent frequency:buleg buriin deed hyzgaartai tentsuu buyu tuunees baga zuilsiin percent g haruuln

Question 10

累积分布等于：

Answer 10

Cumulative frequency:hurimtlagdsan davtamjiin tarhaltiin suulchiin utga ni ajiglaltuudiin niit tootoi urgelj tentsuu
Cumulative relative frequency : hurimtlagdsan haritsangui davtamjiin tarhaltiin suulchiin utga ni urgelj 1.00tei tentsuu bn
Cumulative percent frequency: hurimtlagdsan percent davtamjiin tarhaltiin suulchiin utga ni urgelj 100tai tentsuu bn

Question 11

画stem and leaf display(茎叶图)

Answer 11

P.28
Durslel deerh mur buriig ish gej nerlene
Ish bur deerh tsifruud ni navch

Question 12

Navchnii negj?

Answer 12

Navchnii hed ch bj bln
Navchnii negjiig haruulaagu tohioldold 1tei tentsuu gej uzn

Question 13

Cross tabulation(交叉分组表)

Answer 13

Cross tabulation is a useful analysis tool commonly used to compare the results for one or more variables with the results of another variable.

Question 14

交叉分组表的remark

Answer 14

Remark: when the cross tabulation involves aggregated data, we should investigate whether a hidden variable could affect the results. (Like Simpson’s paradox)

Question 15

在Data上有几个类似 Data

Answer 15

Categorical Data
Quantitative Data

Question 16

Categorical data ‘s tabular displays, graphical displays

Answer 16

Tabular displays －frequency dist, Rel freq dist, % freq dist, cross tabulation
Graphical displays －bar chart, pie chart, side by side bar chart, stacked bar chart

Question 17

Quantitative Data?
Tabular displays, graphical displays

Answer 17

Tabular displays －freq dist, rel freq dist, ％ freq dist, cum freq dist, cum rel freq dist, cum % freq dist, cross tabulation
Graphical displays －dot plot, histogram, stem and leaf display, scatter diagram