confidence interval


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Related to confidence interval: Confidence level

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)
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.

con·fi·dence in·ter·val (CI),

a range of values for a variable of interest, constructed so that this range has a specified probability of including the true value of the variable.

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.

confidence interval

A measure of the precision of an estimated value, which corresponds to a range of values consistent with the data that have a high probability (± 95%) of encompassing the "true" value. The confidence interval is expressed in the same units as the estimate. Wider confidence intervals indicate lower precision; narrower intervals indicate greater precision.

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.

con·fi·dence in·ter·val

(CI) (konfi-dĕns in'tĕr-văl)
Range of values for a variable of interest, constructed so that this range has a specified probability of including the true value of the variable.

confidence interval (CI)

A statistical term that quantifies uncertainty. In a clinical trial, the 95% confidence interval (the interval usually employed) for any relevant variable is the range of values within which we can be 95% sure that the true value lies for the entire population of people from which those patients participating in the trial are taken. The greater the number of patients on which the confidence interval is based the narrower it becomes.

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%.
Enlarge picture
Cone cutting.

confidence

degree of assurance.

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.
References in periodicals archive ?
ANOVA two factors were controlled: SR based VARIETY; STRESS Analysis of variance for senescence rate Source DL SC CM F P VARIETE 3 1344 448 1,14 0,347 STRESS 4 11209 2802 7,15 0,000 Erreur 32 12544 392 Total 39 25097 Confidence interval 95% STRESS Moyenne N1 6,7 ( * ) N2 5,3 ( * ) N3 23,0 ( * ) N4 32,5 ( * ) N5 50,0 ( * ) 0,0 20,0 40,0 60,0 Confidence interval 95% VARIETE Moyenne BIDI 23,5 ( * ) GTA 32,4 ( * ) VITRON 16,3 ( * ) WAHA 21,7 ( * ) 10,0 20,0 30,0 40,0
Parametric bootstrap confidence intervals for the 95th percentile with no censoring varied in length from 0.
interval result: "A 95% confidence interval for the correlation
Interpretations made from confidence intervals estimated from x = 0 successes and x = 0 failures are equivalent, thus a discussion of the case where x = n successes has been omitted.
Upper Confidence Interval (rounded up) = 10, the tenth number in the ranking.
The other positive extension of the sampling logic included in the revenue procedure is the relaxation of the requirement to use the lower limit of the confidence interval when the sample is sufficiently precise.
For simple linear regression if the group size m is equal to 4, the resulting confidence interval for the mean response of the group is 4 times the confidence limits found in formula 3 (Neter, Wasserman & Kutner, 1990).
Our second contribution is to construct confidence intervals for pixel values, by generalizing a theorem of O'Leary and Rust to allow both upper and lower bounds on variables.
The focus of this section is on presenting the confidence interval and estimating its variance.
But some products did not perform as well as others and had very broad 90% confidence intervals for both AUC and [C.
The bootstrap percentile confidence interval is based upon the quantiles of the bootstrap distribution of estimates and is given by:
Furthermore, the 95% confidence interval, which also reveals additional interesting information, was also included on the output and it also provided another means to demonstrate how interval estimates can be used with real data: We can be 95% confident that a player's average points per game will increase on average somewhere between 1.