About: study design controlled variable

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type	Class
label	study design controlled variable
subClassOf	directive information entity nodeID://b665185306 nodeID://b665209603 nodeID://b665808125 nodeID://b665832422 nodeID://b665864637 nodeID://b665888934 nodeID://b665913231 nodeID://b665937528
described by	proxy:entity/http/purl.obolibrary.org/obo/obi.owl
term editor	PERSON: Bjoern Peters PERSON: Alan Ruttenberg PERSON: Chris Stoeckert
example of usage	In a study in which gene expression is measured in patients between 8 month to 4 years old that have mild or severe malaria and in which the hypothesis is that gene expression in that age group is a function of disease status, age is a controlled variable.
definition	Controlled variable specification is a part of a study design. They are the entities that could vary, but are kept constant to prevent their influence on the effect of the independent variable on the dependent.
definition source	WEB: http://en.wikipedia.org/wiki/Control_variable
alternative label	controlled variable
editor preferred term	controlled variable specification
has curation status	ready for release
editor note	In the Philly 2013 workshop the label was chosen to distinguish it from "controlled variable" as used in statistical modelling 2/2/2009 Original definition: Controlled variables are also important to identify in experiments. They are the variables that are kept constant to prevent their influence on the effect of the independent variable on the dependent. Every experiment has a controlling variable, and it is necessary to not change it, or the results of the experiment won't be valid
curator note	2009-03-16: work has been done on this term during during the OBI workshop winter 2009 and the current definition was considered acceptable for use in OBI. If there is a need to modify thisdefinition please notify OBI.
is topic of	Ontology for Biomedical Investigations

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