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REACH Dictionary
S Clear

Secondary data analysis involves the use of previously collected data in a particular research field to study a different research question. Researchers can recycle data from one article or combine data from various studies to create a new, larger sample as well.

Category: Study methods and variables

Selection bias occurs when a sample is not selected randomly, whether accidentally or deliberately, and thus does not provide an accurate representation of the population.

Category: Errors and biases

Selection effects are correlations between a characteristic of the study subject and the presence of an observer, thus resulting in biased data.

Category: Errors and biases

Semi-structured interviews are a data collection method for qualitative research, in which interviewees are asked questions about overarching themes rather than a from a script of questions, which allows participants to present responses relevant to the themes in question and potentially present unexpected themes as well.

Category: Study methods and variables

Related Terms:

A service is "a branch of the Armed Forces of the United States, established by act of Congress, which are: the Army, Marine Corps, Navy, Air Force, and Coast Guard."

Category: Military

Related Terms:

The Sexual Assault Prevention and Response Program is "a Department of Defense program for the Military Departments and Department of Defense components that establishes sexual assault prevention and response policies to be implemented worldwide."

Category: Military

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Single-item measures, also referred to as one-item questions, consist of measuring tools used by researchers that contain only one question. These measures include scales which rank the participants' responses (e.g., a pain scale from no pain to the worst pain ever).

Category: Study methods and variables

Snowball sampling is a nonprobability sampling procedure through which the first few initially recruited participants go on to recruit more participants, and so on. Though this sampling method can be convenient, it does not necessarily provide an accurate representation of the population being studied.

Category: Study methods and variables

"The Sobel test is used to determine whether a variable carries (or mediates) the effect of an independent variable to the dependent variable—the outcome of interest." To do so, this method tests whether or not there is no difference between the impact of the independent variable on the dependent variable and the impact of that same independent variable on the dependent variable when accounting for potential mediators.

Category: Data analyses

The social interaction learning (SIL) model is structured to teach with an emphasis on an individual's relationships to others. Teaching methods in SIL include group work and cooperative learning facilitated by teachers to help students construct meaning.

Category: Theories

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