U.S. flag
      An official website of the United States government, Department of Justice.
        Here's how you know
      Here's how you know**Official websites use .gov**
            
            A **.gov** website belongs to an official government organization in the United States.
      **Secure .gov websites use HTTPS**
            
            A **lock** (
            A locked padlock
            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. Menu

      
        close

            
            
                                              About NIJ
        
                    
  
          About NIJ
      
    
          The NIJ Director
          How NIJ Is Organized
          Mission and Guiding Principles
          Research and Development Process
          Strategic Framework
          Assessments of NIJ
          Annual Reports & Reports to Congress
          Staff Directory
          Funding & Awards
        
                    
  
          Funding & Awards
      
    
          Current Funding
          Forthcoming Funding
          Expired Funding
          Awards: Listing of Funded Projects
          Guidance for Applicants and Awardees
          Fellowship & Student Programs
          Travel Scholarships
          NIJ Challenge Program
          Library & Multimedia
        
                    
  
          Library & Multimedia
      
    
          NIJ Journal
          Podcasts
          Publications Listing
          Multimedia Listing
          Rated Practices on CrimeSolutions
          Rated Programs on CrimeSolutions
          Software & Databases
          Datasets
          Patents
          Topics
        
                    
  
          Topics
      
    
          Article Listing
          Corrections
          Courts
          Crime Prevention
          Crimes
          Drugs and Crime
          Equipment and Technology
          Forensic Sciences
          Youth Justice
          Justice System Reform
          Law Enforcement
          Tribal Crime and Justice
          Victims of Crime
          Events
        
                    
  
          Events
      
    
          NIJ 2024 Research Conference
          Scheduled Events
          On-Demand Events
          Research Meetings & Workshops
          NIJ-Hosted Online Training

                            
                                About
          Contact Us
          Subscribe
          Topics A-Z
                  Share
FacebookXLinkedInRedditPinterestEmail Home
                            Library & Multimedia
 Statistical Methods for Combining Multivariate and Categorical Data in Postmortem Interval Estimation
NCJ Number
              250467

Author(s)
          Lynn R. LaMotte
Date Published

December 2016
Length
              11 pages
Annotation
              This project focused on estimating postmortem interval (PMI) using insect evidence, because this field provides the largest data set for model exploration; however, the statistical methods used are broadly applicable in all scientific disciplines concerned with PMI estimation.
Abstract
              Inverse prediction (IP) is a statistical methodology that can be used to obtain confidence sets on estimates. This project's objective was to extend and adapt methods of IP for use in forensically important settings. The three main parts of this research were to develop methods of IP multivariate quantitative responses with heterogeneous variance-covariance structure, including flexible, adaptive modeling of both means and variances; to develop methods of IP for categorical responses with the same modeling flexibility; and to integrate these results to create IP methods for hybrid quantitative-categorical responses. A common objective in this three-pronged effort was to assess and quantify the inherent uncertainty accurately and defensibly. The over-arching objective was to develop a set of statistical methods and versatile, accessible tools for IP in settings important in assessing time since death and other forensically important applications. This objective was accomplished by making it possible for IP methodology to be implemented within the broad context of mixed linear models. Its computations leading to p-values and confidence sets can be more easily performed, because an investigator can now do the analysis using a variety of widely available statistical computing packages. The project has submitted for publication scientific manuscripts to illustrate the immediate practical value of the IP methods for guiding PMI research design. Scholarly products are listed.
      
  
          Additional Details
Grant Number(s)
        2013-DN-BX-K042


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Publication Type
        Research (Applied/Empirical)
                                Report (Study/Research)
                                Report (Grant Sponsored)
                                Program/Project Description


  
  
        
  Award
        Statistical Methods for Combining Multivariate and Categorical Data in Postmortem Interval Estimation
    
  
  
Date Published: December 1, 2016
    
          Downloads
        
                      PDF

Side navigation
  

        

  
  
              NIJ Journal
    
      
            
            
            
      Podcasts
    
      
            
            
            
      Publications Listing
    
      
            
            
            
      Multimedia Listing
    
      
            
            
            
      Rated Practices on CrimeSolutions
    
      
            
            
            
      Rated Programs on CrimeSolutions
    
      
            
            
            
      Software & Databases
    
      
            
            
            
      Datasets
    
      
            
            
            
      PatentsRelated Topics
        
                Death investigations
        Forensic sciences
        Homicide
        Homicide investigations
        Justice system



  
Similar Publications
        
                      Moving Forward While Looking Back: Understanding the Influence of a “Test All” SAK Mandate on Sexual Assault Case Attrition
                  The Over-citation of Daubert in Forensic Anthropology
                  Technical Note – Analysis Of Marijuana And Marijuana Products
 Top

      National Institute of Justice

        
        
                        About NIJ
                    About NIJ
      
    
                  How NIJ Is Organized
      
    
                  NIJ Director
      
    
                  Research Disclaimer
      
    
                  Funding & Awards
                    Funding & Awards Home
      
    
                  Awards Listing
      
    
                  Current Funding
      
    
                  Guidance for Applicants and Awardees
      
    
                  Resources
                    Events
      
    
                  Podcasts
      
    
                  Publications
      
    
                  Topics
      
    
                  Multimedia
      
    
                  Reuse Policy
      
    
                  Contacts
                    Contact NIJ
      
    
                  Staff Directory
      
    
                  Submit a FOIA Request
      
    
                  File a Civil Rights ComplaintFacebook
          
                      X
          
                      YouTube
  

      810 7th St. NW, Washington, D.C. 20531
      
              Secondary Footer link menu
            Accessibility
              Plain Language
              Privacy Policy
              Legal Policies and Disclaimer
              No FEAR Act
              Freedom of Information Act
              USA.gov
              Justice.gov