Kenneth Wayne Sheffield
Richmond, VA 23238
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Objective
To obtain a position that will enable me to use my strong statistical and
analytical skills and provide a stable, fulfilling career.
Experience
05/2011 - 05/2013 IBM, New Carrollton, MD
Managing Consultant - Data Mining Specialist
. Developed SPSS Modeler Fraud Models responsible for stopping 16
billion dollars in tax fraud
. Responsible for three of the five priority fraud models
. All models developed were superior to prior year versions
. Developed exploratory Identity Theft models
. Rebuilt and automated project sampling plan to allow for interactive
updating
. Worked with client to establish technical requirements or identifying
fraud schemes
. Developed methodology for identifying taxpayer entities
. Created process flows for life cycle tax fraud identification
including segmentation, model options, and treatments
. Mapped rule and requirement data to IRS income forms and data sets
06/2010 - 05/2011 SAIC, Alexandria, VA
Senior Data Mining Specialist
. Provided Data Mining Expertise for responses to government proposals
. Analyzed hundreds of thousands of internet use records to identify
users accessing inappropriate content - . findings were used by
Securities Exchange Commission staff in determination of appropriate
disciplinary action
. Used EnCase Forensic software to review existing and deleted evidence
files on suspect machines
. Wrote a comparison report for the Military Health System after
analyzing multiple "Commercial Off-the-shelf" Time Series and
Forecasting programs
. Developed a project database allowing SAIC sales staff immediate
access data from multiple data sources with customized filtering
capabilities
10/2009 - 06/2010 IRS (Contractor - Trinus), Washington, DC
SPSS Modeler/Data Mining Specialist
. Reported to IRS Criminal Investigation Department - An overview of
existing Fraud Detection models for precision, accuracy and complexity
. Verified Hit-to-Scan ratios and fraud coverage
. Identified potential gaps in Fraud Detection and provided appropriate
steps to improve coverage
. Established Data Mining test environment allowing for efficient
creation and evaluation of models
. Generated and presented alternative models that reduced the existing
70,000 rule C5.0 model to a single equation with no significant loss
in model performance
. Provided Knowledge Transfer on Data Mining and SPSS Modeler
11/2006 - 04/2009 Capital One Financial (Contractor - CXI, Inc),
Richmond, VA
Data Analyst/Data Mining Specialist
. Programmed multi-million dollar financial (Credit Limit Increase
Program) scorecards and parallel models in SPSS Modeler SQL language
. Used SQL to program Instalment Loan models in SPSS Modeler
. Translated and refined Business Analyst requirements into statistical
programming logic for credit card portfolio models
. Provided SPSS Modeler and general statistical programming training to
Capital One staff members
. Mined historical and transactional customer data to create segmented
customer lists
. Evaluated, debugged, and validated existing financial models
. Accessed, merged, transformed, and validated data from scores of
tables, dozens of which contained over one hundred million cases
. Managed timelines and expectations for multiple simultaneous SPSS
Modeler models
. Standardized data pull and exclusion logic across financial models
. Worked with Business Subject Matter Experts and Data Base
Administrators to optimize model and reporting processes
06/2005 - 09/2006 Princeton Data Source, Fredericksburg, VA
Call Center Project Manager
. Forecast daily and weekly hour requirements for call center projects
. Wrote SPSS syntax and utilized Excel spreadsheets to calculate daily
response rates, attempts by call queue, and sample management reports
for multiple projects
. Developed a multi-variable tool for scoring interviewers
. Responsible for project and sample management in Quancept
. Responsible for questionnaire review and quality control
03/2004 - 04/2005 Department of Defense (Contractor - Softworld),
Rosslyn, VA
Survey Research Methodologist
. Responsible for statistical and survey knowledge transfer
. Created survey process and project background documents
. Reviewed and revised proposed survey questions for validity,
functionality between related questions, and analytic possibilities
. Designed new survey instruments
. Provided maintenance support for existing instruments
. Provided analysis of new and existing surveys
. Used proprietary survey internet tool
. Utilized SPSS for survey analysis
07/2000 - 01/2004 IRS (Contractor - EDS, Raytheon), New Carrollton, MD
Survey Research Specialist
. Generated reports for Congress, Commissioner, CIO and Directors;
reports covered methodology and sampling, stratified response analysis
across location, Business Unit, and tenure
. Worked with Subject Matter Experts to identify survey purposes and
define proper information required to meet those purposes
. Created general and system specific survey instruments
. Developed procedures that increased response rates by fifty percent
. Derived sampling methods for large multi-level stratified populations
. Educated IT staff on survey creation and analysis methods
. Facilitated end user focus groups
Key Skills
IBM SPSS Modeler (SPSS Modeler), IBM SPSS Statistics, IBM SPSS Data
Collection Survey Suite, CRISP-DM, Means Testing, Forecasting, Regression,
Time Series, Market Basket Analysis, Correlation, Probability, Descriptive
Statistics (such as Cross Tabs, Frequencies, Custom Tables, etc.), Sample
Design, Access, Excel, Word, Powerpoint
Education
BS in Statistics
North Carolina State University, US