Stat 344: Course Information
Instructor: Jiahua Chen
Oce: ESB 3136; email: [email protected];
Avoid sending me emails as much as possible.
If you have to, use UBC email account only.
For most course
Stat 344, Midterm Nov 5, 2012
Instructor: Jiahua Chen; Duration: 50mins; Aids: Calculators
Some useful facts in obvious notation
Var(n ) = (1
y
n S2
) ;
N n
n
s2 = (n 1)1
n
n
(yi yn )2 = (n 1)1 [
i=1
Statistics 344 - Final Exam
Friday, December 18, 2015
Instructions:
Two sheets (both sides, i.e., 4 pages) of notes and a simple calculator are allowed.
The exam time is 150 minutes.
There are six
Statistics 344 - Midterm Exam
Monday, February 28, 2011
Instructions: One sheet (both sides) of notes and a simple calculator are allowed. The
exam time is 50 minutes. There are four problems, with a
Lexi Zhang
Assignment HW03 due 10/27/2015 at 06:00pm PDT
STAT344-101 2015W1
Solution: (a) Under simple random sampling, the sample
mean of the scores, yS = 71.18, estimates the population mean.
If pre
Lexi Zhang
Assignment HW04 due 11/20/2015 at 06:00pm PST
STAT344-101 2015W1
Greater Numbsville is comprised of three villages: Lower
Numbsville (LN, 500 residents), Old Numbsville (ON, 700 residents),
Lexi Zhang
Assignment HW02 due 10/09/2015 at 06:00pm PDT
STAT344-101 2015W1
The le lawyers.csv linked below contains the result of a
simple random sample of 35 out of 220 counties that comprise
the my
Lexi Zhang
Assignment HW01 due 09/25/2015 at 06:00pm PDT
STAT344-101 2015W1
Your market research rm has been hired to conduct a survey. The goal is to produce estimates of both average annual
income a
nite or not innite populations?
The line is not so clear in other examples.
The nite population may itself be dynamic. When the
unemployment information is needed, the population itself changes
with t
Week 2, Continue from Week2a slides.
Jiahua,Chen
Stratied,Simple,Random,Sample
2.3.1 Some notions the textbook omitted
The general task of a statistician is to make inference about the
stochastic syst
STAT 344 Lecture Notes- Week 4
Remark: This part of the note matches Chapter 4 and more.
4.1. Population proportion There is no doubt that proportion of units
with a specic characteristic in the popul
STAT 344 Lecture Notes- Week 2
Remark: This part of the note matches Chapter 2 and more.
2.1. Finite population
Generally speaking, a target population in survey context are nite populations. If you k
Week 2, Continue from Week2b slides.
Jiahua,Chen
Week2c
2.3.2 Back to sampling plan SRSWOR
Suppose a nite population has N units, and a sampling plan
makes every subset of size n equally likely to bec
STAT 344 Lecture Notes- Week 3
Remark: This part of the note matches Chapter 3 and more.
3.1. Bias, variance and MSE of an estimator A statistical problem is
invariably to make inference on some aspec
STAT 344- Assignment 1
Marking scheme:
0: practically nothing sensible;
1: good eort; 2: sensible;
3: correct in principle; 4. nearly or is perfect.
Very simple problems worth 2 marks rather than 4. E
STAT 344- Assignment 2
Marking scheme:
0: practically nothing sensible;
1: good eort; 2: sensible;
3: correct in principle; 4. nearly or is perfect.
Very simple problems worth 2 marks rather than 4. E
Stat 344, Midterm Nov 14, 2014
Instructor: Jiahua Chen; Duration: 50mins; Aids: Calculators
1. [3] Provide one key dierence between concepts of stratum and cluster.
Ans: We do not sample strata but sa
Lexi Zhang
Assignment HW02 due 10/09/2015 at 06:00pm PDT
STAT344-101 2015W1
The le lawyers.csv linked below contains the result of a
simple random sample of 35 out of 220 counties that comprise
the my
Statistics 344 - Final Exam
Wednesday April 13, 2011
Instructions: Two sheets (both sides) of notes and a simple calculator are allowed. The
exam time is 150 minutes. There are eight problems, with a
STAT 344 Lecture Notes- Week 1
Remark: This note is anticipated as a condensed version of the textbook
to be delivered as lectures. I will mark the relevant sections in the textbook
as much as possibl
STATISTICS 344, Lecture #9
Ratio Estimation, Continued
September 26, 2016
Recall ratio estimation idea: Y of interest, X auxiliary
Record both (xi , yi ) for sampled units (for i 2 S, in our notation)
STAT 344: October 24, 2016
First Thoughts about Cluster Sampling
Say the population you are studying is all residents of Vancouver. And the variable y you
are interested in is the number of contacts a
STATISTICS 344, Lecture #10
Regression Estimation
September 28, 2016
Recall from last time: A graphical view of ratio estimation
Think of line passing through (0, 0) and (
xS , yS ) as a fitted line
o
STATISTICS 344, Lecture #16
Poll of Polls, with a Tweak
October 14, 2016
Say you have five independent studies estimating current
support for a political party
Study
Estimate
SE
1
0.29
0.01
pagr
2
0.4
STATISTICS 344, Lecture #17
Review
October 17, 2016
My exam philosophy
Looking for demonstration of core skills
Looking for understanding of big-picture concepts
Not looking for recall of obscure deta
STATISTICS 344, Lecture #2
Some Review, and a Demo
September 9, 2016
STAT 200: Inference for/by a Mean
ANIYB:
propor*on
With respect to a numerical variable Y , typical notation would be:
Size
Mean
SD
STATISTICS 344, Lecture #28
Venue Sampling
November 16, 2016
Where are we at?
Last time - a (second-hand, from NYT) story about sampling
weights.
Today - a (first-hand) story about sampling weights.
P
STATISTICS 344, Lecture #12
Stratification I
Text
October 3, 2016
Today we look at the reverse situation from last time
samplepropor/on
Estimation in a domain: Take a single sample from the whole
popu
STATISTICS 344, Lecture #4
Tweaking the STAT 200 Theory
September 14, 2016
Scorecard (i): Population mean, total, variance:
yP
=
tP
=
sP2
=
N
1 X
yi
N
i=1
N
X
yi
i=1
1
N
1
N
X
i=1
(yi
yP )2 .
Scorecar
STAT 344
Lecture #23
Cluster Sampling IV
November 3, 2017
1 / 14
Todays synthetic population Y-values: 20 sub-populations
with 10 members each
head(y,3)
#
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9]
STATISTICS 344, Lecture #8
Ratio Estimation, Continued
September 25, 2017
Where are we at?
Last time - Lecture 7(B) - only made it through to the end of slide
6.
Slides 7-9: a few contexts where ratio
STATISTICS 344, Lecture #6
Sample Surveys and Change Over Time
September 20, 2017
Motivation
Surveys of political opinion, especially during an election campaign,
are amongst the most visible applicat
STATISTICS 344, Lecture #4
Tweaking the STAT 200 Theory
September 15, 2017
Scorecard (i): Population mean, total, variance:
yP
tP
=
=
N
1 X
yi
N
i=1
N
X
yi
i=1
N
sP2
=
1 X
(yi yP )2 .
N 1
i=1
Scorecar