CHAPTER 15: Data Preparation and Analysis of Data - Coggle Diagram
CHAPTER 15: Data Preparation and Analysis of Data
A process of inspecting, cleaning, transforming and modeling data with goal of highlighting useful information, suggesting conclusion, and supporting decision making.
has multiple facets and approaches, encompassing diverse techniques under a variety of names.
Logging The Data
mail surveys returns
coded interview data
pre-test or post test data
procedure for logging in the information and keep track of incoming data
set up database
Checking the Data for Accuracy
Question to asked as part of initial data screening
Are the responses legible/readable?
Are all important questions answered?
Are responses complete?
Is all relevant contextual included?
Developing a database
to store data for study for analysis
option for storing data on computer
instrument/method of collection
Entering the Data into the Computer
type the data directly
high level of accuracy
reduce entry error
transform raw data into variables
The Process of Data Analysis
can be done during the stages of data entry
no subjective decision are made
The guiding principle
during subsequent manipulations of data
information should always be cumulatively retrievable
Initial Data Analysis
Quality of Data
Alternative to assess data quality
normal probability plots
Quality of Measurement
possible transformation of variables
square root transformation
possible data distortions should be checked
Characteristics of Sample Data
can be assesed by looking at
basic statistics of important value
analyses that can be used during the initial data analysis phase
Main Data Analysis
aim to answer the research questions are performed as well as other relevant analysis needed to write the first draft of the report