CSAFE @ ISU - REU 2017

Statistical Approaches to Matching Bullets

Anna Steffensmeier

Posted on July 28, 2017

What data do Hare et al use? Hare et al used the x3p file, bullet R-package, and the random forest package. The 3-D scanned images of the bullets from the Hamby study were used as the foundation of their data, which they then analyzed later. In what... [Read More]

Statistical Approaches to Matching Bullets

Francesca Spencer

Posted on July 28, 2017

What data do Hare et al use? They used a “reference database” of 3D bullet scans to train a statistical model. In what ways do the methods used by Hare et al differ from the “traditional” methods of bullet matching? The “traditional” methods involve using a comparison microscope... [Read More]

Statistical Approaches to Matching Bullets

Kahlil Sample

Posted on July 28, 2017

What data do Hare et al use? The data used were 3D topographical images of each bullet, an array of surface measurements (x3p format) and “x3pr” and “bulletr” R packages In what ways do the methods used by Hare et al differ from the “traditional” methods... [Read More]

Statistical Approaches to Matching Bullets

Sam Rew

Posted on July 28, 2017

What data do Hare et al use? Hare et al use 3-D topographical images of their sample bullets from the Hamby study. Each bullet is scanned six times, once per land, in order to gather the data. Hare et al use bulletr and x3pr packages in R to... [Read More]

Matching Bullet Lands: Hare, Hofmann, and Carriquiry

Amanda Rae

Posted on July 28, 2017

Background: Watch the entire CSAFE webinar (including questions at the end) posted here. (The actual presentation starts about 7 minutes in.) While you are watching, keep in mind the following questions to respond to when you’re finished: 1. What data do Hare et al. use? Hare discusses... [Read More]

CSAFE @ ISU REU

Summer 2017

195 Durham Center

Iowa State University

Leaders: Joe Papio, joepapio at iastate dot edu and Sam Tyner, sctyner at iastate dot edu

Description:

Statistical Approaches to Matching Bullets

Anna Steffensmeier

Statistical Approaches to Matching Bullets

Francesca Spencer

Statistical Approaches to Matching Bullets

Kahlil Sample

Statistical Approaches to Matching Bullets

Sam Rew

Matching Bullet Lands: Hare, Hofmann, and Carriquiry

Amanda Rae

More info...