integrity of research data - mit opencourseware...integrity of research data data acquisition,...
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Integrity of Research Data
Data Acquisition, Management, and Sharing
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Definition of DATA
Recorded information; includes writings, films, sound recordings, pictorial reproductions, drawings, designs, or other graphic representations, procedural manuals, forms, diagrams, work flow charts, equipment descriptions, data files, data processing or computer programs (software), statistical records, and other research data
[NIH Grants Policy Statement, “Rights in Data”]
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Some Issues In Data Integrity � Acquisition and record keeping
� Processing
� Ownership and control� Retention and storage
� Access and sharing
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Policies & Guidelines Concerning Data Integrity � Federal (e.g., Public Health Service, Food
and Drug Administration) � Institutional (e.g., MIT) � Laboratories or research groups
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Data Acquisition and Record-Keeping
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Record KeepingStandards from FDA (standards for
eventual approval of biologics, drugs,devices) • Basic science: “Good Laboratory Practices”
or GLP’s • Clinical studies: “Good Clinical Practices” or
GCP’s • Standards for design, conduct, recording,
reporting of research studies – data for approval of use must be of “highest qualityand integrity” [FDA]
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Record Keeping in Research StudiesFDA GLP:
• All data should be recorded promptly • Entries must be dated and signed • Any changes should not obscure original
entry • Reason for change must be indicated,
signed, and dated [21 CFR PART 58]
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Laboratory NotebooksWhat to record?
• Methods • Results/observations • Ideas • Location of relevant computer & paper files • Changes to protocol • Notes from lab meetings • Contributors at each stage
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Laboratory NotebooksHow to record?
• As results are generated • Chronologically • With clear, readable entries
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Laboratory Notebooks Do’s and Don’ts Do
• Use bound notebook with sequentially numbered pages
• Write in black ink (resistant to moisture, solvents)
• Sign and date each entry • Correct mistakes by slash, initialed and
reason given
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Laboratory Notebooks Do’s and Don’ts Do
• Include attachments by taping into notebook and putting initials/date across tape
• Save notebooks
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Laboratory Notebooks Do’s and Don’ts Don’t
• Erase • Leave blank spaces without slash, signature,
and date • Tear out pages
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Record Keeping in Clinical Studies FDA GCP
• Maintain case history records
� Supporting documents � Case report forms
• Ensure accuracy, completeness, legibility, and timeliness of data
• Make corrections to case history records so as not to obscure original entry (applies to both written and electronic corrections)
[Federal Register, vol. 60, number 159]
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Record Keeping in Clinical Studies � Case History Records should include
• Basic subject information • Information that subject meets eligibility criteria • Information on treatment • Information from tests and examinations
� Lab results � X-rays � Physical examinations, etc.
� Form of record can be printed, optical, or electronic
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Record Keeping Using ComputersComputerized data collection systems must
• Allow data entry by authorized individuals only • Control ability to delete or alter entries • Provide audit trail
� Who made change � When � Why
• Protect from tampering • Ensure preservation of data (backup & recovery) • Have system for generating print-outs
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Data Processing
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Data Processing� Maximize following in data set:
• Completeness • Accuracy
� Verify that • Data are entered correctly • Each variable falls within proper range • No missing values (or identify and handle cases with
missing information)
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Data Entry� Use double entry systems
• Enter observations into initial data set • Re-enter to validate
Use direct transfer from equipment�
� Check after entry
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Out-of-Range Values“Outlier” is observation that appears
inconsistent with remainder of data set � Detect outliers in a single variable
• Are the minimum and maximum values for each variable what you expect?
• Does the distribution have outlying tails? � If possible, determine cause of outliers � Decide how to deal with them before
analysis
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Possible Sources of Outliers � Errors made in taking, recording, or
entering data � Case with extreme value is not part of
population you intended to sample � Extreme value is result of extreme (but
real) biological or environmental variation
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Example
Case
1
2
3
4
…
16
F (N)
20
3400
4500
2010
…
7000
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ExampleHistogram
Num
ber
0
1
2
3
4
5
6
0-50
0
500-
1000
1000
-150
0
1500
-200
0
2000
-250
0
2500
-300
0
3000
-350
0
3500
-400
0
4000
-450
0
4500
-500
0
5000
-550
0
5500
-600
0
6000
-650
0
6500
-700
0
Force (N)
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Example� When checking original tracing of load
cell output, find force for Case 1 = 2000 N Æ data entry error
� When checking original description of cases, find that Case 16 is male. Sample was intended to be female Æ case is not part of intended sample
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Outliers in a Combination of Variables � Unusual combination of two or more
measurements � Can use scatter plots to search among
continuous variables for unusual patterns � There are statistical multivariate methods
to detect these outliers
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Example of Multivariate Outlier
0
0.2
0.4
0.6
0.8
1
1.2
17 19 21 23 25
BMD
(g/c
m2 )
BMI (kg/m2)
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Outlying Data What To Do Strategy depends on source � Inaccurate data entry
• Replace with correct value Case is not from target population�
• Delete case if you know that you inadvertently sampled unit that is not from target population
• Run analysis with and without case and compare results if you only suspect
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Outlying Data What To Do � Extreme variation
• Run analysis with and without case and compare results
• Use techniques during the analysis phase that adjust for skewed data
• Live with it and accept any distortion caused by outlier
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Missing Values� Identify and flag missing values
Determine cause if possible�
• Examples: Patient drop-out, machine malfunction
� Quantify amount of missing information � Check pattern -- should be random � Decide how to deal with missing values
before analysis
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Missing Values -- What To Do � Drop variable with missing value(s)� Drop case with missing value(s)� Accept unequal numbers of observation
� Be cautious with repeated-measures designBone Mineral Density (g/cm2)
ID Baseline Year 1 Year 2
1 1.22 1.19 2 1.01 3 0.88 0.99
1.12 0.97 0.86
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Missing Values -- What To DoImpute missing values (be careful)�
• Use average of non-missing values � Potential problem: variability of new data set may
be underestimated • Use preceding non-missing value after
sorting data into meaningful order • Use relationships with other variables to
estimate missing value (do not use variables to be used in hypothesis testing)
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Missing Values -- What To Do � Treat missing data as data
• Use when failure to have value may itself bepredictor of outcome in your study
• Make new “dummy” variable out of variablewith missing values and use as anothervariable in analysis � Complete = 0 � Missing = 1
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Data Processing -- Summary Make Measurements
check for Enter Data (Computer) Use system to
correct values Handle missing, out-of-range values
Refine Data Set
Back up on regular basis
Analyze
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Data Processing – Responsible Conduct � Refining data set may require omission or
modification � Disclose basis for dropping or modifying
data
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Data Ownership and Custody
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Data OwnershipData ownership standards and policies
depend on source of support • Public Health Service (PHS): Data generated
under PHS grant is owned by granteeinstitution
• Sponsored research: Ownership and controldepend on research contract
• Unsupported: Typically institution retainsownership
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Data Ownership – PHS Policy “In general, grantees own the data
generated by or resulting from a grant-supported project”
NIH Grants Policy Statement, “Rights in Data”
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Data Control - Sponsored Research � For sponsored research contracts, control
of data is often in “publication” paragraph
� Examples: • Institution is free to publish results of
research after providing Sponsor with time to review for � Patentable material � Inadvertent disclosure of proprietary information
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Data Custody
Custody or guardianship is typically in hands of PI or Laboratory (on behalf of institution)
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Departure of Investigator� Policies regarding departure depend on
institution � Examples:
• If PI leaves institution � PI able to remove original data while allowing
future access � PI takes copies
• If co-investigator, post-doc, student leaves Original data left with PI; copies provided Original data left with PI; access allowed
�
�
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Data Retention and Storage How long must original data records be
retained? • PHS: 3 years after end of grant
[45 CFR Part 74] • FDA: 2 years after marketing approval
[21 CFR Part 58] • Institutions/laboratories: Varies from 2 years
after publication to indefinitely
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Data Retention and Storage Where should original data records be
stored? • Often not stated explicitly • Examples:
� In laboratory In research office of institution�
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Data Retention and Storage
Under what conditions should original databe stored? • Ideal conditions
� Temperature and humidity controlled � Protection against natural disaster or theft � Access controlled (no alterations) but easy to
retrieve • Reality
� File drawer
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Documentation of Storage� Usually no set institutional policy � Recommendation: Maintain tracking
directory that records • Type of data (notebook, tape, x-ray, etc.)
and identifying number • Project title • Investigator • Date data were recorded or notebook
completed • Storage location
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Data Sharing
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Data Access and Sharing
Potentially opposing goals of data exchange: • Right of investigators to get credit for data
(through analysis, presentation at research meetings, publication)
versus • Obligation of investigators to make data
available to colleagues
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Data Access and SharingWhy do we need access?
• Openness and exchange of information are basic tenets of science
• Access may be required to investigate allegations of misconduct
• Access may be requested through Freedom of Information Act
• Access required for PHS-funded research
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MIT Policy Statement on Data Sharing
“The prompt and open dissemination of the results of M.I.T. research and the free exchange of information among scholars are essential to the fulfillment of M.I.T.'s obligations as an institution committed to excellence in education and research”
Guide to the Ownership, Distribution and Commercial Development of M.I.T. Technology
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NIH Statement on Sharing Research Data � NIH expects timely release and sharing of
final research data for use by other researchers
� NIH will require applicants to include a plan for data sharing or to state why data sharing is not possible. (applies to grants over certain amount)
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NIH Statement: Why share? � Extends NIH policy on sharing research
resources � Reinforces open scientific inquiry � Encourages diversity of analysis and
opinion � Promotes new research � Supports testing of new or alternative
hypotheses and methods of analysis
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Why share?� Facilitates the education of new
researchers � Enables the exploration of topics not
envisioned by the initial investigators � Permits the creation of new data sets
from combined data
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What kind of information should be shared? � Final research data necessary to validate
research findings � Does not include:
• laboratory notebooks • partial data sets • preliminary analyses • drafts of scientific papers • plans for future research • communications with colleagues • physical objects, such as gels or lab specimens
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To what kind of research does this apply? � Data generated with support from NIH:
• Basic research • Clinical studies • Surveys • Other types of research
Especially important to share:�
• Unique data sets that cannot be readily replicated
• Large, expensive data sets
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Caveats for studies including human research participants� Investigators need to be cautious with
• Studies with very small samples • Studies collecting very sensitive data
� However, even these data can be shared if safeguards exist to ensure confidentiality and protect identify of subjects
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What is meant by timely?No later than acceptance for publication of
main findings from the final data set
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How to share data?� Provide in publications � Share under the investigator’s own
auspices � Place data sets in public archives � Put data on a web site � Place in restricted access data centers or
data enclaves � Other ways
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Summary
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Summary� Policies on responsible data management
are evolving � Some current views:
• Investigator’s responsibility to ensure accurate and reliable data set, including � Primary sources (e.g., notebooks) � Refined data set
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Summary• Institutions tend to own data • PI’s or laboratories tend to have custody of
data • Original data should be retained for ≥3 years • Access is required for PHS-funded research
(after publication) and may be required for other types of support
• Open dissemination of results is basic tenet of research community
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Resources� Committee on National Statistics, National
Research Council, Sharing Research Data,National Academies Press, available athttp://www.nap.edu/books/030903499X/html/index.html
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Resources� MIT TLO Policy Guide, available at
http://web.mit.edu/tlo/www/guide.2.html � National Aeronautics and Space Administration
(NASA) Guidelines for Ensuring the Quality ofInformation, available at ftp://ftp.hq.nasa.gov/pub/pao/reports/2002/NASA_data_quality_guidelines.pdf
� NIH Data Sharing Information Main Page,available at http://grants2.nih.gov/grants/policy/data_sharing/