dependent variable is the outcome that the researcher wants to predict or explain. Changes in the dependent variable are presumed to be caused by the independent variable.oResearch variables (what types of studies do you find these in?)Descriptive and correlational quantitative studies Research variables are the qualities, properties, or characteristics identified in the research purpose and objectives or questions that are observed or measured in a study. Research variables are used when the intent of the study is to observe or measure variables as they exist in a natural setting without the implementation of a treatment. Thus no independent variables are manipulated and no cause and effect relationships are examined©2015 UTA School of Nursing5
oExtraneous variables (include confounding and environmental variables)exist in all studies can affect the measurement of study variables and the relationships among these variablesExtraneous variables are of primary concern in quantitative studies because they can interfere with obtaining a clear understanding of the relational or causal dynamics within these studies. These variables are classified as recognized or unrecognized and controlled or uncontrolled. Some extraneous variables are not recognized until the study is in progress or has been completed, but their presence influences the study outcome.What is a conceptual definition of a variable? provides the theoretical meaning of a variable and is often derived from a theorist's definition ofa related concept. In a published study, the framework includes concepts and their definitions, and the variables are selected to represent these concepts. The variables are conceptually defined, indicating the link with the concepts in the framework.What is an operational definition of a variable? is derived from a set of procedures or progressive acts that a researcher performs to receive sensory impressions (e.g., sound, visual, or tactile impressions) that indicate the existence or degree of existence of a variable Operational definitions need to be independent of time and setting so that variables can be investigated at different times and in different settings using the same operational definitions. An operational definition is developed so that a variable can be measured or manipulated in a concrete situation; the knowledge gained from studying the variable will increase the understanding of the theoretical concept that this variable represents.What are demographic variables? are attributes of subjects that are collected to describe the sample.The demographic variables are identified by the researcher when a proposal is developed for conducting a study. Some common demographic variables are age, education, gender, ethnic origin (race), marital status, income, job classification, and medical diagnosisChapter Six: Understanding the Literature Review in Published Studies©2015 UTA School of Nursing6
In chapter six, the assigned pages to read are 163 – 187. Please read with a focus on quantitative research studies.
You've reached the end of your free preview.
Want to read all 10 pages?
- Fall '16
- Denise Cauble
- Nursing, UTA School of Nursing