baseline

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baseline

 [bās´līn]
an observation or value that represents the normal or beginning level of a measurable quality, used for comparison with values representing response to experimental intervention or an environmental stimulus, usually implying that the baseline and reponse values refer to the same individual or system.

baseline

Clinical trials
The health state—disease severity, confounding conditions, etc.—present in a person or group of individuals at the beginning of a prospective study.
 
The baseline is time “zero”, before the participants in the study receive an experimental agent or intervention, or negative control; drug safety and efficacy may be determined by monitoring changes in baseline values; variations in distributions of baseline values between groups may introduce bias in the results.
 
Informatics
A measure of cumulative citation frequency across all Derwent Section classes, which shows upward and downward trends in a particular patent family.

Sleep disorders
The normative (i.e., typical) state of a person or of an investigative parameter before an experimental manipulation.
 
Vox populi
A generic term for any basal, null or unstimulated state, often represented as a horizontal line.

base·line

(bās'līn)
1. A line approximating the base of the skull, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus; the skull is in the anatomic position when the baseline lies in the horizontal plane.
Synonym(s): orbitomeatal line.
2. Level of performance or aggregate findings before initiation of therapy.

Baseline

A return to an original state.
Mentioned in: Sedation

base·line

(bās'līn)
1. A line approximating the base of the skull, passing from the infraorbital ridge to the midline of the occiput, intersecting the superior margin of the external auditory meatus.
2. Level of performance or aggregate findings before therapy.
Synonym(s): orbitomeatal line.
References in periodicals archive ?
In addition, baseline choice proportions were variable across pigeons.
HydroPoint has revealed that it will allow Baseline to continue its operations as an independent entity.
In sum, confusion around and abuse of budget baselines have shaped some of the most important fiscal policies of the current century, and failures in budget baselines have undermined political accountability, budget enforcement rules, and a proper understanding of the likely effects of these budget policies.
Xu separates along-track baseline and cross-track baseline through image registration, and estimates the two kinds of baseline errors by image registration and subspace decomposition respectively [20].
Recommendation: To strengthen its baselines, facilitate external and independent reviews of those baselines, ensure effective oversight of the BMDS, and further improve transparency and accountability of its efforts, and to improve clarity, consistency, and completeness of the baselines reported to Congress, the Secretary of Defense should ensure that MDA, for schedule baselines, in meeting new statutory requirements to report variances between reported acquisition baselines, also report variances between the test plan as presented in the previous acquisition baseline and the test plan as executed that explain the reason for any changes.
The baseline model drives design decisions, so the underlying assumptions must be well thought-out and transparent.
This plot is presented in function of azimuths and lengths of baselines according to formulas:
When examining the meta-analysis Swanson and Sachse-Lee report that a multiple baseline design was used in 62% of the studies.
Biomonitoring surveys of selected child populations at an early stage of FQPA implementation could provide important baseline data for the big task of evaluating the law's effectiveness.
The need for a variety of baselines is illustrated in the middle row.
In most practical DF systems, one baseline is not enough; there are ambiguities which are typically resolved by repeating the process with two or more differently oriented baselines, or with baselines of different length.