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What Is a Time-Trend? Why Is It Important to Control

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Essay

What is a time-trend? Why is it important to control for a time-trend if it is present in the data? How can you test and control for a time-trend in your data? Explain.


Definitions:

Blocking

A technique in experimental design used to reduce the effects of nuisance variables by grouping subjects into blocks based on these variables.

Experimental Unit

The smallest division of the experimental material such that any two units may receive different treatments during the experiment.

Psychology Class

An academic course focusing on the study of the mind and behavior, covering topics from mental functions to social interactions.

Observational Study

A study in which the investigator does not manipulate variables but rather observes and measures variables without intervention to find relationships.

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