TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

A lognormal error is usually assumed in the traditional stock–recruitment(SR) analysis.... a positive bias results when [a] SR model with [a] lognormal error is used for fish recruitment prediction. Not only is this bias exponentially dependent on the structure of the model' s residual variance and the historical SR data, it is also dependent on the specific value of spawner biomass used.... a bias correction that is asymptotically unbiased with a finite-sample biasthat is practically zero [is then derived]. Data from two Pacific salmon populations, southeast Alaska pink salmon... and Chilko Lake sockeye salmon... are used to demonstrate this approach. The results show that the relative bias is about 10% for a spawning biomass within the historical range and that the bias is substantial outside that data range. However, with the proposed bias correction, the bias is negligible both within(<0. 1%) and outside of(<0. 3%) the data range.  2, fiche 1, Anglais, - bias%20correction

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

The seminal Generalised Least Squares contribution, together with the first matrix formulation of the Linear Regression Model appeared in Aitken, s paper, "On Least Squares and Linear Combinations of Observations", Proceedings of the Royal Society of Edinburgh, 1935, vol. 55, pp. 42-48. In this paper we find the well-known extension of the Gauss-Markhov Theorem to the case where the regression error vector has a non-scalar covariance matrix-the Aitken estimator is "Best Linear Unbiased".  1, fiche 2, Anglais, - Aitken%20estimator

Fiche 2,  Justifications,  Français

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

... the average of the squared distance between the estimate and the parameter.  4, fiche 3, Anglais, - mean%20square%20error

Record number: 3, Textual support number: 2 DEF

A measure of the error to which one is exposed by the use of an estimator, which is given by the expected value of the squared difference between the estimator and a(theoretically) correct value. For unbiased estimators, the mean square error equals the variance.  6, fiche 3, Anglais, - mean%20square%20error

Fiche 3,  Justifications,  Français

Fiche 3,  Justifications,  Espagnol

Fiche 4,  Justifications,  Anglais

Record number: 4, Textual support number: 1 DEF

The square root of the mean square error [derived from variate values]  1, fiche 4, Anglais, - root%2Dmean%2Dsquare%20error

Record number: 4, Textual support number: 1 OBS

mean square error: ... the average of the squared distance between the estimate and the parameter.  3, fiche 4, Anglais, - root%2Dmean%2Dsquare%20error

Record number: 4, Textual support number: 2 OBS

A measure of the error to which one is exposed by the use of an estimator, which is given by the expected value of the squared difference between the estimator and a(theoretically) correct value. For unbiased estimators, the mean square error equals the variance.  1, fiche 4, Anglais, - root%2Dmean%2Dsquare%20error

Fiche 4,  Justifications,  Français

Record number: 4, Textual support number: 1 CONT

L'erreur type est l'écart type d'une distribution d'échantillonnage d'une mesure obtenue à partir de calculs effectués sur un échantillon.  2, fiche 4, Français, - erreur%2Dtype

Fiche 4,  Justifications,  Espagnol

Fiche 5,  Justifications,  Anglais

Record number: 5, Textual support number: 1 CONT

Procedures have been developed to give asymptotically unbiased estimates of error variance where data periodicity is shorter than contract length.  1, fiche 5, Anglais, - data%20periodicity

Fiche 5,  Justifications,  Français

Record number: 5, Textual support number: 1 CONT

Des méthodes ont été mises au point dans le but de produire des estimations asymptotiquement «non biaisées» de la variance d'erreur quand la périodicité des données est plus brève que la durée des contrats.  1, fiche 5, Français, - p%C3%A9riodicit%C3%A9%20des%20donn%C3%A9es

Fiche 5,  Justifications,  Espagnol