# 1. Read the training dataset into memory: "train.short.csv"
xx=read.csv("train.short.csv",header=T)
new.xx=xx[,3:299]
yy=read.csv("test.short.csv",header=T)
# 2. Build a predictive model where "Purchase.Flag" is the DV
out = glm(Purchase.Flag ~
Field6+F
topicmodels: An R Package for Fitting Topic Models
Bettina Gru
n
Kurt Hornik
Johannes Kepler Universitat Linz
WU Wirtschaftsuniversitat Wien
Abstract
This article is a (slightly) modified and shortened version of Gr
un and Hornik (2011),
published in the
An Introduction to Recursive Partitioning
Using the RPART Routines
Terry M. Therneau
Elizabeth J. Atkinson
Mayo Foundation
June 29, 2015
Contents
1 Introduction
2
2 Notation
4
3 Building the tree
3.1 Splitting criteria . . . . . . . . . . . . . . . . . .
Brief Introduction to Random Forests
Joseph Retzer, ACT Market Research Solutions
Ewa Nowakowska, GfK Data Lab
Sawtooth Software Conference 2016
Park City, Utah
September 2016
I am the Lorax. I speak for the trees.
I speak for the trees for the trees have
#
# Decision Tree Example
#
# Create Single Decision Tree Using CART
# Install and load 'rpart' library for fitting a decision tree
tryCatch(library(rpart),
error=function(e)cfw_install.packages("rpart");library(rpart))
# Install and load 'patykit' librar
Introduction to Random Forests
Joseph Retzer, ACT Market Research Solutions
Ewa Nowakowska, GfK Data Lab
Sawtooth Software Conference 2016
Park City, Utah
September 2016
I am the Lorax. I speak for the trees.
I speak for the trees for the trees have no to
#Video test
#
# Load relevant packages
library("httr")
library("XML")
library("stringr")
library("ggplot2")
# Define Video source
video.url = 'http:/byuanalytics.com/emotion/rabbit.mp4'
# Define Microsoft API URL to request data
URL.emoface = 'https:/api.
STAT
121: Writing Assignment 2
Significance Test and Confidence Interval (24 points)
Directions: Read the following problem, and follow directions, and answer each question completely but
concisely. Be sure to save a copy of your work, and see the syllabu
# average point differential for each season in the footballGames table
select SeasonID, avg(BYUscore) - avg(OPPscore) as diff
from footballGames
group by SeasonID;
#Avergage Gain on different days of the week in the footballoffstats (join will
be needed)
Know the advantage of an experiment over an observational study
Experiments are used to establish causation (a cause and effect relationship between the explanatory
and response variables) and observational studies cannot be used to establish causation.
G
Know how to interpret slope in a least squares regression line
Slope tells us the average "increase" (positive slope) or "decrease" (if slope is negative) in y for each one
unit increase in x. When interpreting, you need to first determine what the x and
Know why random sampling and random allocation are so important
So we can do inference.
Be able to identify the population of interest, the response variable and the sample
The population is the entire group of individuals about which the researcher wishe
Be able to compute a confidence interval for slope
Use the first value in the second row as the estimate and the second value in the second row as SEb; find
t* using t table using df = n - 2. Remember that the formula for df is given on the formula sheet.
Explanatory vs. Response variable in terms of regression
In regression, the response variable is the one we want to predict (the y) and the explanatory variable is
the x variable (i.e., the variable we use to do the predicting.)
Be able to construct and i
Be able to decide whether to use the five-number summary or mean and standard deviation to describe
a data set
Moore recommends using the five-number summary in the presence of outliers.
Know how to find a probability on an individual for a given x-value
Know the four parts of statistics
It's the study of data analysis-defining the problem, collecting data, analyzing and summarizing data, and
drawing inferences from data.
Know the definition of distribution
A list of the possible values of a variable toge
lack of realism
weakness in experiments where the setting of the experiment does not realistically duplicate the
conditions we really want to study.
law of large numbers
the true probability of an event "A" is estimated by the relative frequency with whic
convenience sample
sample where the researcher contacts those subjects who are readily available and does not use any
random selection. the results are almost surely biased.
cluster sampling
sampling conducted when the population is naturally divided into
bias
A condition that occurs when the design of a study produces a sample that is not representative of the
population.
blocking
The grouping of individuals according to some characteristic like rats in the same litter or plots of land at
the same locatio
Michael Jenkins
BM 121 MW 10am
Week 1: September 20th- 26th; 1 Nephi 7:16- This scripture talks about frankly forgiving
our brethren.
Living this scripture of forgiveness proved to be much harder but much more
fulfilling than I had thought it would be. In
Michael Jenkins
Section 009
Writing Assignment #1
1. The population that the confidence interval is making an inference about is
all adult Americans (ages 18 or older)
2. The parameter of interest is the true average heart rate of all adult
Americans.
3.
STAT 121: Writing Assignment 2
Significance Test and Confidence Interval (24 points)
Directions: Read the following problem, and follow directions, and answer each question
completely but concisely. Be sure to save a copy of your work, and see the syllabu
STAT 121: Writing Assignment 1
Confidence Intervals (13 points)
Directions: Read the following article and answer each question completely but concisely. Be
sure to save a copy of your work, and see the syllabus for submission details. (The spacing
betwee