Continuous Probability Distributions
Probability Density Function (pdf):
the probability function for a continuous random variable such that
the area under the pdf curve between any two points a and b is equal
to the probability p(a<x<b). The total area
Probability Model of the data
Population parameters
(; )
Probability
Model/distribution
Observed Data: random sample from the
1, ,
Probability model acts as the bridge between population and the
sample drawn from it.
Using the probability model, we can
Descriptive Statistics and Graphics
Example: A Depression study among Breast Cancer patients (BC
depression study)
A double-blinded study to compare the efficacy and safety of paroxetine
and desipramine with that of placebo in the treatment of depressive
Poisson Distribution
! For the binomial distribution, the random variable was the number of
occurrences of an event in a fixed and finite number of trials (the number of
girls born in a series of 5 births).
! For situations in which the number of trials i
You Are What Your Mother Eats: Evidence for Maternal Preconception Diet Influencing Foetal
Sex in Humans
Author(s): Fiona Mathews, Paul J. Johnson and Andrew Neil
Source: Proceedings: Biological Sciences, Vol. 275, No. 1643 (Jul. 22, 2008), pp. 1661-1668
Lab 1 Outline
I.
II.
What is SAS?
Learn the parts of the SAS system.
III.
Explore the data using PROC CONTENTS and PROC PRINT.
IV.
Miscellaneous information you need to know about SAS
How to use the notes:
An arrowhead bullet point always indicates an in
BIOS 500 Lab 2 Fall 2015
Lab 2 Outline
Recall: Given an electronically stored data set, we want to do 3 things with it (in this order):
1. Examine what has been recorded (Lab 1)
2.
PROC CONTENTS
PROC PRINT
Examine the distribution of the values of our dat
BIOS 500
Homework #2
Due to the size of the class, only one or two of these problems will be graded. A full
solution set will be provided for you to check the remaining problems on your own.
These homework problems are very similar to those you might find
BIOS 500
Homework #1
1. A clinical trial was developed to measure the effects of a new surgery technique
for relieving intracranial pressure from clotting in stroke patients. Eleven patients
were recruited, and were initially assessed for motor function b
BIOS 500
Homework #3
1. CD4 counts are normally distributed, with the distributions depending on gender. For
males, the mean is 800, with a standard deviation of 200, while for females, the mean is
1050, with a standard deviation of 180.
a.
b.
c.
d.
e.
f.
BIOS 500
Homework #4
1. Give three reasons for using a sample to draw inference to a population.
2. What makes a sample a random sample?
3. A researcher who is investigating a new treatment for AIDS patients presents her
findings in a journal article, sta
BIOS 500
Homework #7
1. Obtain a six-sided die, and roll it 120 times. Record the number of times you
observe each outcome (1 through 6). Test whether the die is fair (formally state
the null and alternative hypothesis, calculate the test statistic and p-
BIOS 500
Homework #5
A researcher is looking at the effects of a new drug for treating time to relief from an
asthma attack. He recruits 15 asthma patients, and randomizes them to one of two
study groups. The control group receives an inhaler with a stand
BIOS 500
Homework #6
1. A researcher wanted to observe the effect of three different treatments on a
random sample of overweight people. He randomly assigned each participant to
one of four groups (Hi-Carb, Low-Carb, No-Carb, Placebo), and measured the
am
THE UNIVERSITY OF TEXAS HEALTH SCIENCE CENTER AT HOUSTON
SCHOOL OF PUBLIC HEALTH
PH1690 FOUNDATIONS OF BIOSTATISTICS
Assignment # 3 [60 points]
Due date October 7, 2016 by or before 10:00pm CST
Suppose that a disease is inherited via a dominant (DOM) mode
Rollins School of Public Health of Emory University
Department of Biostatistics
BIOS 531 - SAS Programming Fall 2014
INSTRUCTORS:
OFFICES:
OFFICE HOURS:
George Cotsonis
GCR 222A
Tue 10-11 am
Friday 9-10 am
LECTURES:
M 1:00 pm 2:50 pm
GCR P45 (Paul)
GCR 10
CHRISTIANSEN-LINDQUIST
MEASURES OF FREQUENCY &
INTRODUCTION TO STATISTICS
EPI 530
1
CHRISTIANSEN-LINDQUIST
LORD KELVIN 1824 1907
Ones knowledge of
science begins when
[they] can measure
what [they are]
speaking about and
express it in numbers
2
CHRISTIANS
BIOS 510: Homework 1, due 9/14/2016
Exercises refer to Bain/Engelhardt, 2nd edition
1.
p. 45: 19
2.
A throws 2 dice and wins if he scores at least one 1. B throws 3 dice and
wins if he scores at least two 1s. Who has the greater probability to win?
3.
Fro
BIOS 506, 2016
Homework 2
Due Date: Thursday September 29th
Question 1. Assume that serum cholesterol level among adults in the United States is normally distributed with a
mean of 190 mg/dL and standard deviation 40 mg/dL. Use R to generate 5,000 samples
EPIDEMIOLOGY 530
Exercise 1
Overview of Epidemiology &
Experimental vs. Observational Research
1
Instructions:
Please read the following article entitled, How to Know Whether to Believe a Health Study.
This lab session will be a review of the first three
CHRISTIANSEN-LINDQUIST
COHORT STUDIES I
EPI 530
1
CHRISTIANSEN-LINDQUIST
COHORT STUDIES I: OVERVIEW
Review of study types
Cohort study basics
General defining features
Prospective vs. retrospective cohort studies
Measures of frequency and association
BIOS 506, 2016
Homework 1
th
Due Date: Monday September 19
Question 1. Suppose that an influenza epidemic strikes a city. In 10% of families the mother has influenza; in 10%
of families that father has influenza; and in 2% of families both the mother and
CHRISTIANSEN-LINDQUIST
EPIDEMIOLOGIC STUDY TYPES AND DESIGNS
EPI 530
1
CHRISTIANSEN-LINDQUIST
OVERVIEW
Types of Studies
Descriptive vs. analytic
Experimental vs. observational
Overview of study designs
Clinical trials
Cohort studies
Case-control (C
The Structure and Function
of Nucleic Acids
Revised edition
C.F.A. Bryce* and D. Pacini
*Department of Biological Sciences, Napier University, Edinburgh, and
Bolton School Boys Division, Bolton
The Biochemistry Across the School Curriculum Group (BASC) wa
Every year, cancer claims the lives of more than half a million Americans. Cancer is the second
leading cause of death in the United States, exceeded only by heart disease. One of every four
deaths in the United States is due to cancer. For a short moment
Screenings are medical tests that doctors use to check for diseases before there are any
symptoms. Screenings help find diseases early, when they may be easier to treat. Getting
screening tests is one of the most important things you can do for your healt
Ebola virus disease, formerly known as Ebola hemorrhagic fever, is a severe often fatal
illness in humans. The virus is transmitted to people from wild animals and spreads in the
human population through human to human transmission. (WHO, 2014) The most
s
Public health inspectors are found in most of our everyday establishments. In fact they are the
front line members of government health departments who monitor businesses and public
facilities. They protect the public from many common health threats becau