# Data Analysis and Linear Regression: A Comprehensive R Solution

August 19, 2023
Chloe Mitchell
🇺🇸 United States
R Programming
Chloe Mitchell is a seasoned expert in R programming and statistics, boasting over 9 years of experience. With a Ph.D. from Kansas State University, Chloe specializes in assisting students with their assignments.
Key Topics
• Problem Description:
• Step 1: Setting Up the Environment
• Step 2: Data Import and Cleaning
• Step 3: Variable Categorization
• Step 4: Descriptive Statistics
• Step 5: Normality Testing
• Step 6: Linear Regression Analysis
• Step 7: Significance Testing

In this comprehensive data analysis and linear regression solution, we explore a dataset comprising 2400 responses to 10 interview questions using the R programming language. We guide you through the entire process, starting with setting up your R environment and ensuring the necessary packages are in place. Subsequently, we clean the data, categorize key variables, generate descriptive statistics, and assess the normality of the dataset. The culmination of our analysis is a thorough linear regression, unveiling the significance of specific variables. This resource equips you with the tools and insights for robust data-driven decision-making.

## Problem Description:

In this R Programming assignment, we analyze a dataset of 2400 responses to 10 interview questions using R. We begin by preparing our environment, ensuring the necessary packages are loaded. Next, we clean the data, eliminating invalid responses. Key variables, such as age, education, employment, and religious inclination, are categorized. Descriptive statistics are generated, and the normality of the data is assessed. Finally, a linear regression analysis is performed to explore the significance of select variables within the dataset.

## Step 1: Setting Up the Environment

In R, the first step is to ensure that all the necessary packages are correctly installed and loaded into the library. For this project, we rely on key packages, including Janitor, dplyr, tidyverse, psych, and readxl.

R Code

``````# Load required packages
library(janitor)
library(dplyr)
library(tidyverse)
library(psych)

## Step 2: Data Import and Cleaning

The dataset consists of 2400 responses to 10 interview questions. It's crucial to clean the data by eliminating invalid responses such as "Don't Know," missing data, and those who refused to answer. We can achieve this using the subset() function in R, which results in the removal of 323 data points with problematic responses.

R Code

``````# Import the Excel dataset
# Clean the data by removing invalid responses
data_cleaned &lt;- data %&gt;%
subset(!(Question %in% c("Don't Know", "Missing", "Refused to Answer"))) ``````

## Step 3: Variable Categorization

Selected variables, including age, education, employment, and religious inclination, need to be categorized for analysis. This is accomplished using the cut() function.

R Code

``````# Categorize selected variables
data_cleaned &lt;- data_cleaned %&gt;%
mutate(
Age_Group = cut(Age, breaks = c(18, 25, 35, 45, 55, 65, Inf),
labels = c("18-25", "26-35", "36-45", "46-55", "56-65", "66+")),
Education_Level = cut(Education, breaks = c(0, 8, 12, 16, 20, Inf),
labels = c("Primary", "High School", "Bachelor's", "Master's", "PhD")),
Employment_Status = cut(Employment, breaks = c(0, 1, 2, 3, Inf),
labels = c("Unemployed", "Part-time", "Full-time", "Self-employed")),
Religious_Level = cut(Religious, breaks = c(0, 1, 2, 3, Inf),
labels = c("Low", "Moderate", "High", "Very High"))
) ``````

## Step 4: Descriptive Statistics

Descriptive statistics provide insight into the characteristics of the variables. To obtain these statistics, we can use the summary() or describe() functions. describe() offers more detailed information about the variables.

R Code

``````# Generate descriptive statistics
descriptive_stats &lt;- describe(data_cleaned) ``````

## Step 5: Normality Testing

To assess normality, a normality test can be applied. This helps determine whether the data follows a normal distribution.

R Code

``````# Perform normality test
normality_test_result &lt;- shapiro.test(data_cleaned\$Variable_of_Interest) ``````

## Step 6: Linear Regression Analysis

For linear regression analysis, we will select a subset of the data. The results of this analysis are shown below.

R Code

``````# Perform linear regression analysis
linear_model &lt;- lm(Y_Variable ~ X1 + X2 + X3, data = data_cleaned)
# View the results of the linear regression
summary(linear_model) ``````

## Step 7: Significance Testing

Using a two-sided t-tailed test, we assess the significance of specific variables (e.g., Q52J, Q19A, Q1, and Q101) within the rejection region. Further variable testing can be conducted as needed.

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