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]

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]

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]

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]

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]

1. What data do Hare et al use? The data that they use is the 3D topographical images of the bullets, along with the x3p format which is the array of surface measurements at the micrometer level. They used x3pr and bulletr for processing the data in R. They... [Read More]

The data used was 3D topographical images of each bullet. Each image is in x3p format, which is an array of surface measurements at the micrometer level. R was used to streamline formatting. The traditional method of examining bullet striations involves placing the bullets under a... [Read More]

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: What data do Hare et al use? In what ways... [Read More]

1) What data do Hare et al use? For this study, Hare et al used the random forest package, the x3p file, and bullet r package. In regards to their reference data base, they used the Hamby study as a starting point and analyzed the data from there. 2) In... [Read More]

What data do Hare et al use? The data format that Hare et al used was 3D topographical images, they also used 3 R packages which were randomForest, x3pr, and bulletr. In what ways do the methods used by Hare et al differ from the “traditional” methods... [Read More]

What data do Hare et al use? The data used was: the Hamby Study of known impressions as a reference database, the random forest model software, and two other R packages – x3pr and bulletr, developed by Hoffman and Hare. Data was collected using 3D topographical images of... [Read More]

Chapter 13 The reasoning for saying “provided strong evidence that using the busy road was quickest” as opposed to “proved that using the busy road was quickest” is because the outcome of the experiment cannot be “proved” without measureable data. A very small p-value was... [Read More]

Background: Read Chapters 13-15 of the book What is a p-value anyway? by Andrew Vickers. (Sam and Joe will have handed copies out already.) Respond to the circled discussion questions at the end of each chapter. Remember, length of response is not as important as how well and how... [Read More]

Chapter 13: 1) To say you have proved something suggests that it is a fact. He did not prove that the busy road was ALWAYS the fastest, but the evidence suggested that in most cases the busy road was quicker than the back roads. 2) A p-value isn’t a numbers... [Read More]

Chapter 13 The narrator stated they “provided strong evidence” rather than “proved” that using the busy road was quickest because it takes more to prove that something is the way it is. The narrator stated that from the statistical analysis that they conducted by timing the rides home... [Read More]

Chapter 13 There is a difference between proof and evidence. Evidence suggests that there is a strong correlation between two things, but there is still room for doubt. Proof is considered to be undeniable and final. Proof is based on a massive set of evidence in order... [Read More]

Chapter 13 The reason why the writer says “provided strong evidence that using the busy road was quickest,” instead of saying “I proved it” is because one cannot prove something that is constantly changing. Also one can’t prove without data plus the outcome cannot be applied broadly.... [Read More]

Chapter 13 The reason the author could not say that he proved that the busy road was the quickest is because statistics is about managing risk and more data would be needed in order to “prove” it. The small p-value (despite the trivial difference between... [Read More]

Background: Read Chapters 13-15 of the book What is a p-value anyway? by Andrew Vickers. (Sam and Joe will have handed copies out already.) Respond to the circled discussion questions at the end of each chapter. Remember, length of response is not as important as how well and how... [Read More]

Chapter 13: 1) When one says that they have “proved” something, they are calling it a fact. When conducting a study, no matter what the subject or field is, you need to have sufficient backing before you call something a fact. Much of the time, this means that experiments have... [Read More]

Chapter 13 There was no need fore me to prove it because even though you provided strong evidence you still have to weigh all considerations in order to pick the road that will be very beneficial to you. The difference between the two p-value groups are trivial because... [Read More]

Chapter 13 The author could not say that he proved that the busy road was the quickest since there are different variables that can affect the potential outcomes. For example when calculating the means and standard deviations on given day, some influences could impede the traffic flow such... [Read More]