missing data


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missing data

EBM
A term used in the context of a clinical trial for:
(1) Data not completed or corrupted in reports and case report forms; or
(2) Data not captured when a subject withdraws from a trial.
 
Clinical trial reviewers are usually more concerned about non-captured data, as patients who are not improved or who believe they have experienced side effects are more prone to leave a trial, thus skewing the analysis of results if such analysis were only done on subjects who had continued with the trial. Trial designs therefore specify plans for how such missing data will be treated in analysis.
References in periodicals archive ?
Generally, both MI and a broad range of missing data issues have received ample attention in the applied literature (Graham et al.
It may be thought that all missing data can and should be imputed.
An automated missing data validation process could perform a missing data check of the same 72,000 volume records in a fraction of the time, usually seconds.
When a biller communicates missing data elements to the rest of the staff at staff meetings, the result is improved office efficiency.
Missing data are data you desired to collect but never got into your database for subsequent analysis.
The CPA expert witness, on both sides of the lawsuit, must literally sift through the data and material to determine what is specifically relevant to his or her testimony, Also, the trial team always finds there seems to be either too much, too little or missing data.
Cllr Taylor said: "This missing data must be bad news.
If one drive fails, the missing data would be lost, but RAID level 5, for example, adds parity data (check digits) to disk striping, allowing the data on the failed drive to be reconstructed from the data remaining on the other drives.
If the warehousing organization will invest in uniform representation--methods for covering missing data and correcting errors--it will significantly decrease the preparation of data for KDD.
The decision tree also shows a 34-percent cumulative probability that the court will find the company's method accurate if the missing data are found and if the full expert testimony is admitted.
Another feature, the on-line auditor, alerts you to math errors, as well as missing data and deductions that might draw the IRS' attention.
APPENDIX: DEFINITIONS AND IMPUTATIONS FOR MISSING DATA
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