Factors originating outside a system or study that influence outcomes but are not part of the model being tested. In experimental research, external variables are everything the researcher didn't design, didn't control, and often didn't consider. They include weather, politics, economic conditions, cultural events, personal histories—the entire buzzing chaos of reality that can't be confined in a laboratory. Good research designs attempt to control for external variables through randomization, blinding, or statistical adjustment, but they can never eliminate them entirely. External variables are why causation is so difficult to establish: the thing you think is causing your effect might just be correlated with some external factor you never noticed.
External Variables Example: "The classroom intervention seemed to work perfectly, but the external variable—a new education policy implemented the same week—made it impossible to know what actually caused the improvement."
by Dumu The Void March 12, 2026
Get the External Variables mug.Factors originating within a system or study that influence outcomes and are, in principle, part of what the researcher is studying or should be controlling. In experimental design, internal variables include the treatment itself, participant characteristics, measurement procedures, and all the elements the researcher deliberately manipulates or measures. However, internal variables also include unintended factors: participant expectations (placebo effects), researcher expectations (experimenter bias), measurement error, and all the ways the study itself shapes its own results. Distinguishing intended internal variables from confounding internal variables is the fundamental challenge of research design.
Internal Variables Example: "They thought they were measuring the drug's effect, but the internal variable of participant expectation—they all knew they were getting the real drug—confounded everything. The improvement might have been pure placebo."
by Dumu The Void March 12, 2026
Get the Internal Variables mug.Broad, encompassing factors that influence outcomes across multiple contexts and studies—the kind of variables that every researcher knows they should consider but rarely can adequately measure. General variables include things like socioeconomic status, educational attainment, cultural background, historical period, and other massive forces that shape human life so pervasively they're almost invisible. In any specific study, general variables are noise to be controlled; across studies, they're the patterns that emerge when enough data accumulates. The challenge of general variables is that they're everywhere and nowhere—they influence everything but are rarely the focus of investigation.
General Variables Example: "Every study of educational outcomes finds socioeconomic status as a general variable—it predicts everything, explains a huge amount of variance, and is almost impossible to truly control for because it shapes every aspect of a child's life."
by Dumu The Void March 12, 2026
Get the General Variables mug.Unusual, specific, or context-dependent factors that influence outcomes in particular situations but aren't generalizable across contexts. Unlike general variables (which appear everywhere), special variables are the idiosyncratic details that make replication difficult and prediction uncertain. In one study, a special variable might be the charisma of a particular teacher; in another, it might be a unique historical event that coincided with data collection. Special variables represent the irreducible particularity of real-world research—the fact that every study happens somewhere specific, at some specific time, with specific people, and those specificities matter.
Special Variables Example: "The intervention worked brilliantly in that school, but the special variable—a beloved principal who retired the next year—meant it could never be replicated. The magic wasn't in the program; it was in the person."
by Dumu The Void March 12, 2026
Get the Special Variables mug.Trackmania Nations Forever maps that are recreations of the first map A01-Race. There is a server full of them and it is dominated by Team A01.
"Hop on A01 Variations"
by CA1EBYT July 3, 2025
Get the A01 Variations mug.When you commit to do something fun with your friends only to be told by your partner you have to change your plans.
by Daniel O’Rourke August 1, 2025
Get the Late variables mug.On social media platforms like YouTube, this term commonly abbreviated as IVRs refer to engagement metrics, such as likes, comments and subscriptions. For creators, this type of engagement can lead to more dopamine in the brain, resulting in a rush of pleasure and validation for their work.
The way his subscriber count kept climbing was all thanks to those intermittent variable rewards; every notification felt like a little win!
by Emotional Cruiser September 22, 2025
Get the intermittent variable rewards mug.