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单词 overfit
释义

overfitn.

Brit. /ˈəʊvəfɪt/, U.S. /ˈoʊvərˌfɪt/
Origin: Formed within English, by conversion. Etymon: overfit v.
Etymology: < overfit v.
Statistics.
An analysis which corresponds too closely or exactly to a particular set of data; = overfitting n.
ΚΠ
1975 Statistician 24 295 It would be wise to start with a simple ‘overfit’ to MA(2).
1983 Jrnl. Accounting Res. 21 294 Measurement and estimation problems resulted in overfits of models in both papers.
1999 Holocene 9 521 In this study, the nonlinear models contain a greater degree of overfit than the linear model.
This is a new entry (OED Third Edition, December 2004; most recently modified version published online March 2022).

overfitadj.2

Brit. /ˈəʊvəfɪt/, U.S. /ˈoʊvərˌfɪt/
Origin: Formed within English, by derivation. Etymons: over- prefix, fit n.4
Etymology: < over- prefix + fit n.4, after misfit n. 3. Compare underfit adj.
Physical Geography.
Designating or relating to a stream which, on the basis of its current flow, would have eroded a larger valley than it occupies. Cf. underfit adj.
ΘΚΠ
the world > the earth > water > rivers and streams > stream > [adjective] > overfit or underfit
overfit1913
underfit1913
misfit1932
1913 W. M. Davis in Ann. Assoc. Amer. Geographers 3 18 Conversely, the capturing branch, AB, and its river, BD, below the entrance of the capturing branch, being increased in volume, should exhibit for a time an overfit relation to their valley curves, in the sense of actively enlarging them.
1954 W. D. Thornbury Princ. Geomorphol. vi. 156 It is difficult to cite examples of overfit rivers... The reason..may be that a stream cannot long remain overfit, for an increase in volume will be accompanied by increased erosive power and rapid adjustment of valley size.
2002 Encycl. Brit. Online 31 July at Valley Some practical measure of size, most often the meander wavelength, indicates that the modern river is either too large or too small for the valley in which it flows. The former condition, known as an overfit stream, is relatively rare.
This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).

overfitv.

Brit. /ˌəʊvəˈfɪt/, U.S. /ˌoʊvərˈfɪt/
Origin: Formed within English, by derivation. Etymons: over- prefix, fit v.1
Etymology: < over- prefix + fit v.1 In sense 2 after overfitting n.
1. transitive. To be too large for. Obsolete. rare.
ΚΠ
a1731 G. Waldron Descr. Isle of Man 184 in Compl. Wks. (1731) Shoes..of such a monstrous Length and Bigness, that they would infinitely have over-fitted the Feet of the Giants set up in Guild-Hall.
2. transitive. Statistics. To produce or represent an analysis which corresponds too closely or exactly to (a particular set of data); to make (a model) fit a particular set of data too precisely. Also intransitive: to provide too close a fit. Cf. overfitting n.
ΚΠ
1955 Jrnl. Royal Statist. Soc. B. 17 98 For the classes of smoothing operator most widely used in practice, the greater the extent of the operator the less the tendency to overfit the trend.
1973 New Phytologist 72 580 It is clear that any attempt to over-fit forces relationships of RGR and NAR with time the raw data do not adequately support.
1997 Marketing Sci. 16 377/1 If your objective is to buld a model that is generalizable to new data..then it is important to use a validation sample to prevent overfitting the model.
This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).

> see also

also refers to : over-fitadj.1
<
n.1975adj.21913v.a1731
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