confidence interval (redirected from Confidence set)

interval /in·ter·val/ (in´ter-val) the space between two objects or parts; the lapse of time between two events.

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atrioventricular (AV) interval  the time between the start of atrial systole and the start of ventricular systole, equivalent to the P–R interval of electrocardiography.

cardioarterial interval  the time between the apex beat and arterial pulsation.

confidence interval  an estimated statistical interval for a parameter, giving a range of values that may contain the parameter and the degree of confidence that it is in fact there.

coupling interval  the length of time between an ectopic beat and the sinus beat preceding it; in an arrhythmia characterized by such beats, the intervals may be constant (fixed coupling i's) or inconstant (variable coupling i's) .

escape interval  the interval between an escape beat and the normal beat preceding it.

interdischarge interval  the time between two discharges of the action potential of a single muscle fiber.

interpotential interval  the time between discharges of action potentials of two different fibers from the same motor unit.

P–R interval  the portion of the electrocardiogram between the onset of the P wave (atrial depolarization) and the QRS complex (ventricular depolarization).

lucid interval 

1. a brief period of remission of symptoms in a psychosis.

2. a brief return to consciousness after loss of consciousness in head injury.

pacemaker escape interval  the period between the last sensed spontaneous cardiac activity and the first beat stimulated by the artificial pacemaker.

P–P interval  the time from the beginning of one P wave to that of the next P wave, representing the length of the cardiac cycle.

QRS interval  the interval from the beginning of the Q wave to the termination of the S wave, representing the time for ventricular depolarization.

QRST interval , Q–T interval the time from the beginning of the Q wave to the end of the T wave, representing the duration of ventricular electrical activity.

systolic time intervals  (STI) any of several intervals measured for assessing left ventricular performance, particularly left ventricular ejection time, electromechanical systole, and preejection period.

V–A interval  the time between a ventricular stimulus and the atrial stimulus following it.

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confidence interval

Etymology: L, confidere, to rely on; L, intervallum, area within ramparts

a type of statistical interval estimate for an unknown parameter: a range of values believed to contain the parameter, with a predetermined degree of confidence. Its endpoints are the confidence limits, and it has a stated probability (confidence coefficient) of containing the parameter.

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Confidence Interval

The range of numerical values in which one can be confident (to a computed probability—e.g., 90 or 95%), that the population value being estimated will be found.

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interval [in´ter-val]

the space between two objects or parts; the lapse of time between two events.

AA interval the interval between two consecutive atrial stimuli.

atrioventricular interval (AV interval)

1. P–R interval.

2. in dual chamber pacing, the length of time between the sensed or paced atrial event and the next sensed or paced ventricular event, measured in milliseconds; called also atrioventricular or AV delay.

cardioarterial interval the time between the apical beat and arterial pulsation.

confidence interval an estimated statistical interval for a parameter, giving a range of values that may contain the parameter and the degree of confidence that it is in fact there.

coupling interval the distance between two linked events in the cardiac cycle.

His-ventricular (H-V) interval an interval of the electrogram of the bundle of His, measured from the earliest onset of the His potential to the onset of ventricular activation as recorded on eight of the intracardiac bipolar His bundle leads or any of the multiple surface ECG leads; it reflects conduction time through the His-Purkinje system.

lucid interval

1. a brief period of remission of symptoms in a psychosis.

2. a brief return to consciousness after loss of consciousness in head injury.

PA interval the interval from the onset of the P wave on the standard electrocardiogram (or from the atrial deflection on the high right atrial ECG) to the A wave on the His bundle ECG; it represents intra-atrial conduction time.

postsphygmic interval the short period (0.08 second) of ventricular diastole, after the sphygmic period, and lasting until the atrioventricular valves open.

P–R interval in electrocardiography, the time between the onset of the P wave (atrial activity) and the QRS complex (ventricular activity).

presphygmic interval the first phase of ventricular systole, being the period (0.04–0.06 second) immediately after closure of the atrioventricular valves and lasting until the semilunar valves open.

QRST interval (Q–T interval) in the electrocardiogram, the length of time between ventricular depolarization (the Q wave) and repolarization (the T wave); it begins with the onset of the QRS complex and ends with the end of the T wave.

VA interval [ventricular-atrial interval] the interval between a ventricular stimulus and the succeeding atrial stimulus; it is equal to the AA interval minus the atrioventricular interval.

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confidence interval,

n a statistical device used to determine the range within which an acceptable datum would fall. Confidence intervals are usually expressed in percentages, typically 95% or 99%.

Cone cutting.

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confidence

degree of assurance.

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confidence interval

a range of values about a sample statistic that has a specified probability of including the true value of the statistic.

confidence level

1 minus the type 1 error; the probability that the trial under consideration will show no significant difference when there is in fact no significant difference between the treatments.

confidence limits

the highest and lowest values in a confidence interval.

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confidence interval

Statistics A range of values for a variable of interest–eg, a rate, constructed so that the range has a specified probability of including the true value of the variable. See Confidence limits.