scholarly journals Missing data in spatiotemporal datasets: the UK rainfall chemistry network

2015 ◽  
Vol 2 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J. N. Cape ◽  
R. I. Smith ◽  
D. Leaver
Keyword(s):  
Missing Data ◽  
Rainfall Chemistry ◽  
The Uk

Revealing the Invisible: The Need for Retrospective Conversion in the Virtual Future

2000 ◽  
Vol 12 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Ann Chapman
Keyword(s):  
Missing Data ◽  
Lifelong Learning ◽  
Electronic Records ◽  
National Strategy ◽  
Access To Information ◽  
New Methods ◽  
The Uk ◽  
The Invisible

Libraries, archives and museums act as memory organizations, recording and providing access to a range of knowledge and information. In an age of increasing access to information via electronic methods, they support lifelong learning, as well as national and international goals in support of the rights of individuals to education, leisure, health and employment. The provision of new methods of accessing catalogues from a distance is severely compromised if the catalogues accessed do not record the complete stock of their institutions, and therefore the retrospective conversion of catalogues is of increasing relevance today. Items for which there are no electronic records effectively become invisible to potential users. The retrospective conversion of catalogues still in manual forms has been a goal since electronic versions were first installed, but the extent to which it has been achieved has been governed largely by financial considerations. Recent studies in the UK have revealed the extent of missing data in the electronic catalogues of libraries and archives. Some retrospective conversion is being carried out as and when funding becomes available, but progress is erratic and piecemeal, without reference to a national overview. To address this problem, a national strategy for the UK has been developed and will be taken forward by a newly formed Implementation Group.

scholarly journals The impact of handling missing data on alcohol consumption estimates in the UK women cohort study

2009 ◽  
Vol 24 (10) ◽  
pp. 589-595 ◽  
Author(s):  
U. Nur ◽  
N. T. Longford ◽  
J. E. Cade ◽  
D. C. Greenwood
Keyword(s):  
Cohort Study ◽  
Missing Data ◽  
Alcohol Consumption ◽  
The Uk ◽  
The Impact

The UK GDPR Reform: missing data privacy, regulatory probity, and harm prevention

2021 ◽  
Author(s):  
Francesca Mazzi ◽  
Abid Adonis ◽  
Josh Cowls ◽  
Andreas Tsamados ◽  
Mariarosaria Taddeo ◽  
...  
Keyword(s):  
Missing Data ◽  
Data Privacy ◽  
Harm Prevention ◽  
The Uk

scholarly journals Missingness Adapted Group Informed Clustered (MAGIC)-LASSO: A novel paradigm for prediction in data with widespread non-random missingness

2021 ◽  
Author(s):  
Amanda E. Gentry ◽  
Robert M. Kirkpatrick ◽  
Roseann E. Peterson ◽  
Bradley T. Webb
Keyword(s):  
Missing Data ◽  
Large Scale ◽  
Scientific Discovery ◽  
Genetic Correlations ◽  
Phenotypic Correlation ◽  
Machine Learning Methods ◽  
Sequential Group ◽  
The Uk ◽  
Clustering Of Variables ◽  
Target Sets

AbstractThe availability of large-scale biobanks linking rich phenotypes and biological measures are a powerful opportunity for scientific discovery. However, real-world collections frequently have extensive non-random missing data. Machine learning methods are able to predict missing data but performance is significantly impaired by block-wise missingness inherent to many biobanks. To address this, we developed Missingness Adapted Group-wise Informed Clustered LASSO (MAGIC-LASSO) which performs hierarchical clustering of variables based on missingness followed by sequential Group LASSO within clusters. Variables are pre-filtered for missingness and balance between training and target sets with final models built using stepwise inclusion of features ranked by completeness. This research has been conducted using the UK Biobank (n>500k) to predict unmeasured Alcohol Use Disorders Identification Test (AUDIT.) The phenotypic correlation between measured and predicted total score was 0.67 while genetic correlations between independent subjects was >0.86, demonstrating the method has significant accuracy and utility.

scholarly journals Factor structure and convergent validity of the Derriford Appearance Scale-24 using standard scoring versus treating ‘not applicable’ responses as missing data: a Scleroderma Patient-centered Intervention Network (SPIN) cohort study

BMJ Open ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. e018641 ◽  
Author(s):  
Erin L Merz ◽  
Linda Kwakkenbos ◽  
Marie-Eve Carrier ◽  
Shadi Gholizadeh ◽  
Sarah D Mills ◽  
...  
Keyword(s):  
Missing Data ◽  
Factor Structure ◽  
Convergent Validity ◽  
Factor Model ◽  
Negative Evaluation ◽  
Model Fit ◽  
Secondary Outcome ◽  
Scoring Methods ◽  
Two Samples ◽  
The Uk

ObjectiveValid measures of appearance concern are needed in systemic sclerosis (SSc), a rare, disfiguring autoimmune disease. The Derriford Appearance Scale-24 (DAS-24) assesses appearance-related distress related to visible differences. There is uncertainty regarding its factor structure, possibly due to its scoring method.DesignCross-sectional survey.SettingParticipants with SSc were recruited from 27 centres in Canada, the USA and the UK. Participants who self-identified as having visible differences were recruited from community and clinical settings in the UK.ParticipantsTwo samples were analysed (n=950 participants with SSc; n=1265 participants with visible differences).Primary and secondary outcome measuresThe DAS-24 factor structure was evaluated using two scoring methods. Convergent validity was evaluated with measures of social interaction anxiety, depression, fear of negative evaluation, social discomfort and dissatisfaction with appearance.ResultsWhen items marked by respondents as ‘not applicable’ were scored as 0, per standard DAS-24 scoring, a one-factor model fit poorly; when treated as missing data, the one-factor model fit well. Convergent validity analyses revealed strong correlations that were similar across scoring methods.ConclusionsTreating ‘not applicable’ responses as missing improved the measurement model, but did not substantively influence practical inferences that can be drawn from DAS-24 scores. Indications of item redundancy and poorly performing items suggest that the DAS-24 could be improved and potentially shortened.

scholarly journals Determining trip attraction rates for the UK office developments with limited observations and missing data

2014 ◽  
Vol 37 (3) ◽  
pp. 247-263
Author(s):  
David C. Broadstock ◽  
Alan Collins ◽  
Lester C. Hunt
Keyword(s):  
Missing Data ◽  
The Uk

The diagnosis and management of factor VIII and IX inhibitors: a guideline from the UK Haemophilia Centre Doctors' Organization (UKHCDO)

2000 ◽  
Vol 111 (1) ◽  
pp. 78-90 ◽  
Author(s):  
C. R. M. Hay ◽  
T. P. Baglin ◽  
P. W. Collins ◽  
F. G. H. Hill ◽  
D. M. Keeling
Keyword(s):  
Factor Viii ◽  
Diagnosis And Management ◽  
Viii And Ix ◽  
The Uk

1476: Prostate Cancer Detection in Men Aged 45-49 Years in the UK Protect (Prostate Testing for Cancer and Treatment) Trial

2006 ◽  
Vol 175 (4S) ◽  
pp. 476-477
Author(s):  
Freddie C. Hamdy ◽  
Joanne Howson ◽  
Athene Lane ◽  
Jenny L. Donovan ◽  
David E. Neal
Keyword(s):  
Prostate Cancer ◽  
Cancer Detection ◽  
Treatment Trial ◽  
Prostate Cancer Detection ◽  
The Uk

653: The Protect (Prostate Testing for Cancer and Treatment) Study: Evaluating Screening and Treatment of Clinically Localised Prostate Cancer in the UK

2006 ◽  
Vol 175 (4S) ◽  
pp. 210-210
Author(s):  
◽  
Freddie C. Hamdy ◽  
Athene Lane ◽  
David E. Neal ◽  
Malcolm Mason ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
The Uk
Sign in / Sign up

Export Citation Format

Share Document