Publications by Harold Nelson
The t test
The t test Harold Nelson 2024-04-03 The t test We can use the t test to test hypotheses about the mean value of a variable. Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ for...
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Tidymodels Regression
Tidymodels Regression Harold Nelson 2024-04-02 Setup Load tidyverse and tidymodels Load the dataframe OAW2309. Solution library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0...
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Hypothesis Testing
Hypothesis Testing Harold Nelson 2024-03-27 Hypothesis Testing Hypothesis testing is an alternative to confidence interval construction. Confidence intervals are easy to understand. You use a confidence interval to make an expanded statement on an estimate you’ve made. Here’s my estimate, and here’s how good I think it. My estimate is WWW ...
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Regression 2
Regression 2 Harold Nelson 4/3/2022 Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0.0 ✔ stringr 1.5.1 ## ✔ ggplot2 3.4.4 ✔ tibble 3.2.1 ## �...
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Regression 3
Regression 3 Harold Nelson 4/5/2022 Setup library(tidyverse) Dummy Variables A dummy variable has only two values, 0 and 1 or (FALSE or TRUE). This device is used in regression to mark the presence or absence of a condition. If one of these is used in the list of independent variables, the value of its coefficient is the amount added to the pre...
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Confidence Intervals
Confidence Intervals Harold Nelson 2024-03-25 Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0.0 ✔ stringr 1.5.1 ## ✔ ggplot2 3.4.4 ✔ tibble 3...
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Proportion Sampling
Proportion Samplinng Harold Nelson 2024-03-25 Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0.0 ✔ stringr 1.5.1 ## ✔ ggplot2 3.4.4 ✔ tibble 3...
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Logistic Regression
Logistic Regression Harold Nelson 3/24/2024 Logistic Regression This model is used for models with a binary outcome. As an example, we will consider the problem of identifying gender based on other variables. We will continue using the cdc2 dataframe. Load the Data load("cdc2.Rdata") Setup Get the packages we need. library(tidyverse) ## ──...
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Regression 1
Regression 1 Harold Nelson 3/21/2022 Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0.0 ✔ stringr 1.5.1 ## ✔ ggplot2 3.4.4 ✔ tibble 3.2.1 ## �...
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Why Normal
Why The Normal Harold Nelson 2024-03-22 Setup library(tidyverse) ## ── Attaching core tidyverse packages ──────────────────────── tidyverse 2.0.0 ── ## ✔ dplyr 1.1.4 ✔ readr 2.1.5 ## ✔ forcats 1.0.0 ✔ stringr 1.5.1 ## ✔ ggplot2 3.4.4 ✔ tibble 3.2.1 #...
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