Econ325River
Normal distribution
T distribution
Perquisite
Know
Population
deviation
Test
Statistic(#)
Z=sample mean-population mean
Population SD/sample size
T= sample mean-population mean
Sample SD/
Chapter 5
Continuous Random Variables
A continuous random variable can take any numerical value in some
interval. Assigning probabilities to individual values is not possible.
Probabilities can be mea
Chapter 7.1
Properties of Point Estimators
Let the random sample X 1 , X 2 , . . . , X n be a set of random
variables that are independently and identically distributed.
An applied study works with a
Chapter 6
Economies of Scale, Imperfect
Competition, and International Trade
6-1
Introduction
When defining comparative advantage, the Ricardian
model and the Heckscher-Ohlin model both assume
consta
Chapter Four
H-O Model
4-1
Introduction
While trade is partly explained by differences in labor
productivity, it also can be explained by differences in
resources across countries.
The Heckscher-Ohl
Chapter 3
3-1
Absolute Advantage
Assume that labor is the only factor of production,
labor productivity is constant, define a unit labor
requirement as the constant number of units of labor
required
Chapter Five
The Standard Trade Model
5-1
Introduction
The standard trade model combines ideas from the
Ricardian model and the Heckscher-Ohlin model.
1.
Differences in labor, labor skills, physical c
Instructions on R Computing
for Applied Statistics (EC208)
1 AN INTRODUCTION TO R . 3
1.1 R INSTALLATION . 3
1.1.1 The base system . 3
1.1.2 Packages . 4
1.2 R HELP AND DOCUMENTATION . 5
1.3 R WINDOWS
Instructions on R Computing
for Applied Statistics (EC208)
1 AN INTRODUCTION TO R . 3
1.1 R INSTALLATION . 3
1.1.1 The base system . 3
1.1.2 Packages . 4
1.2 R HELP AND DOCUMENTATION . 5
1.3 R WINDOWS
Chapter 3.1
Random Experiment, Outcomes and Events
In the analysis of economic data any conclusions involve some
uncertainty. To incorporate ideas of uncertainty into the study of
economic data an und
0
.05
.1
Density
.15
.2
.25
Econ 325 Assignment II
60
65
r(meanX)
70
75
summarize prc
Variable |
Obs
Mean
Std. Dev.
Min
Max
-+-prc |
252
68.8213
Obs
Mean
9.943052
53.75
91.5
Min
Max
summarize meanX
Va
Now introduce two new statistics.
A Test of Normality
Textbook Reference: Chapter 14.2
(eighth edition, pages 591 3; seventh edition, pages 6246).
The calculation of p-values for hypothesis testing ty
Clicker Question
For a sample of daily stock market prices for a company a
financial analyst would like to test the null hypothesis that
the population mean of the daily returns is zero against the
al
Clicker Question
For a sample of final grades for 10 students the average
grade is 75.
A 90% interval estimate for the population mean is
calculated. The upper limit is 77.
Find the lower limit of the
Clicker Question
A study of the effectiveness of a statistics course records test
scores of students from a "before course" test and an "after
course" test. For each student a difference is calculated
Chapter 9.1
Hypothesis Testing
To test the hypothesis, a test statistic is computed from the sample
data. The decision to take can then be either:
Interval estimation leads the way to hypothesis testi
Report of daily stock market data for the Johnson and Johnson
This report analyzes daily stock market data for the Johnson and Johnson in the year 1999.
From graph of the daily closing price from Jan
Chapter 8.1
Confidence Intervals for the Difference
Between Two Population Means
Let ( X i , Yi ) for i = 1, 2, . . . , n be a pair of random variables that
each follow the normal distribution with po
Chapter 10.4 Testing the Equality of Variances
Consider two random samples. Assume:
Like the chi-square distribution, the F distribution is defined only for
non-negative values and the skewed shape of
Instructions on R Computing
for Applied Statistics (EC208)
1 AN INTRODUCTION TO R . 2
1.1 R INSTALLATION . 2
1.1.1 The base system . 2
1.1.2 Packages . 3
1.2 R HELP AND DOCUMENTATION . 4
1.3 R WINDOWS
Chapter 8 Trade Policy
8-1
Types of Tariffs
A specific tariff is levied as a fixed charge for
each unit of imported goods.
For example, $1 per kg of cheese
An ad valorem tariff is levied as a fracti
Environmental Economics
and Policy
Haitao Yin
Overview of Environmental Insurance
The use of insurance policies to manage certain
environmental risks is increasing:
Asbestos abatement insurance:
Pro
EC208
Computing Class
May 31, 2016
CC4: Principal component analysis
In the 1988 Seoul Olympics, the heptathlon () was won by a women athlete from
the USA, Jackie Joyner-Kersee. The results for all 25
EC208
Computing Class
Mar 15, 2016
Computing Class 1: Descriptive statistics
Data household in package HSAUR2 is a data set collected from a survey of household
expenditure, and gives the expenditure
Keys to CC3: ANOVA and Linear regression
1. ANOVA
(1)
a.
> IDSalary <- read.csv(file="IDSalary.csv", row.names=1)
> attach(IDSalary)
> # Tests for the assumptions of ANOVA - normality & variance homog
Chapter 1
Getting Started
Economic data sets are viewed as a sample from the population.
The challenge is to use the sample to make statements about the
behaviour of the population. Some degree of unc
Lecture 1: Matrices, Linear Algebra,
and Vector Geometry
Nandita Krishnaswamy
Columbia University - QMSS
Aug 31st, 2017
Nandita Krishnaswamy (CU)
Lecture 1
Aug 31st, 2017
1 / 84
Introduction
Nandita K
Lecture 4: Regressions
Nandita Krishnaswamy
Columbia University - QMSS
Sept 1st, 2017
Nandita Krishnaswamy (CU)
Lecture 4
Sept 1st, 2017
1 / 13
4: Regressions
Suppose you have n observations of an dep
Lecture 4: Regressions
Nandita Krishnaswamy
Columbia University - QMSS
Sept 1st, 2017
Nandita Krishnaswamy (CU)
Lecture 4
Sept 1st, 2017
1/7
4: Regressions
Suppose you have n observations of an depend