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Record W4242639621 · doi:10.22215/etd/2017-12163

Classification and Feature Selection in Sparse High-Dimensional Models

2017· dissertation· en· W4242639621 on OpenAlexaff
L.F. Thompson

Bibliographic record

Venuenot available
Typedissertation
Languageen
FieldMathematics
TopicStatistical Methods and Inference
Canadian institutionsCarleton University
Fundersnot available
KeywordsDimension (graph theory)Feature selectionComputer scienceSelection (genetic algorithm)Binary numberData miningFeature (linguistics)Artificial intelligencePopulationMachine learningHigh dimensionalPattern recognition (psychology)AlgorithmMathematicsCombinatorics

Abstract

fetched live from OpenAlex

This work deals with binary classification in a sparse high-dimensional model.Essentially, we have two predetermined subclasses of the normally distributed population and we want to assign a new observation to one of the two subclasses.In this thesis, we look at a classification problem in which the sample size is less than the dimension of the data.The goal is to find good methods for classification that can minimize our chances) iii 14.1 Simulations in the region D 1 . . . . . . . . . . . . . . . . . . . . . . . . .14.2 Simulations in the region D 2 . . . . . . . . . . . . . . . . . . . . . . . . .14.3 Simulations in the region D 3 . . . . . . . .

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.005
metaresearch head score (Gemma)0.018
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Theoretical or conceptual · Consensus signal: none
GenreCandidate signal: Methods · Consensus signal: Methods
Teacher disagreement score0.005
Threshold uncertainty score0.027

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0050.018
Meta-epidemiology (narrow)0.0010.001
Meta-epidemiology (broad)0.0020.002
Bibliometrics0.0020.002
Science and technology studies0.0010.002
Scholarly communication0.0020.002
Open science0.0010.002
Research integrity0.0020.003
Insufficient payload (model declined to judge)0.0010.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.130
GPT teacher head0.397
Teacher spread0.268 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designTheoretical or conceptual
Domainnot available
GenreMethods

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations0
Published2017
Admission routes1
Has abstractyes

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