Identify any potential problems with the model

Assignment Help Basic Computer Science

Reference no: EM131239106

For the horseshoe crab data from Exercise 23, there may be signs of over dispersion.

(a) Repeat the analysis from the example on page 316 to see whether a quasi-Poisson or a negative binomial is a better option. In particular, create a plot like Figure 5.10 and compute the quadratic regression as shown in the example. What do you conclude about the two model options?

(b) Fit the quasi-Poisson model to the data and test the model effects again. How do the results compare to those from

Exercise 23?

Exercise 23

Agresti (2007) provides data on the social behavior of horseshoe crabs. These data are contained in the HorseshoeCrabs.csv file available on our website. Each observation corresponds to one female crab. The response variable is Sat, the number of "satellite" males in her vicinity. Physical measurements of the female-Color (4-level ordinal), Spine (3-level ordinal), Width (cm), and Weight (kg)-are explanatory variables.

(a) Fit a Poisson regression model with a log link using all four explanatory variables in a linear form. Test their significance and summarize results.

(b) Compute deviance/df and interpret its value.

(d) Carry out the GOF test described on page 296 using the PostFitGOFTest() function available in the Post Fit GOF Test. R program of the same name from our website. Use the default number of groups. (M/5 when M ≤ 100)

i. State the hypotheses, test statistic and p-value, and interpret the results.

ii. Plot the Pearson residuals for the groups against the interval centers (available in the pear.res and centers components, respectively, of the list returned by the function). Use this plot and the residual plots from part (c) to explain the results.

Reference no: EM131239106

Questions Cloud

How much leeway should an employer have : Do you think the administrative law judge and the National Labor Relations Board (NLRB) went too far in overruling Starbucks? Why or why not? How much leeway should an employer have in setting standards for conduct, customer interaction, and attire i..

Purpose of a continuous improvement program : 1. What is the purpose of a continuous improvement program? What role does HRM play in assisting continuing improvements? 2. What are the various goals of HRM?

Fit a quasi-binomial regression model : Use a beta-binomial model to repeat the analysis from part (a). This can be done using the betabin() function of the package aod. Are the results substantially different?

Find two current research studies on one of given topic : Find two current research studies on one of the topics: - • Media & the Environment - • Social Media - • Media & Politics.

Identify any potential problems with the model : Plot the Pearson residuals for the groups against the interval centers (available in the pear.res and centers components, respectively, of the list returned by the function). Use this plot and the residual plots from part (c) to explain the result..

What are gender conversational rituals : What are gender conversational rituals? Explain how these rituals have a role in conversations. Provide a specific example to show how a person has to adapt to gender differences in communication

Describe successful listening skills and process : Describe successful listening skills and process that can aid communication. How can these skills help you to become an effective leader in your workplace

How does americas taste differ from that of other countries : How does America's taste differ from that of other countries? How are they similar? Do Komar & Melamid's findings align with your own tastes and preferences in art? Do you see any problems with their approach or methods?

Dimensions of effective microsystems : There are 8 dimensions of effective Microsystems. Which two (2) do you believe are the most important and why? Please provide examples to illustrate your position. Don't forget to cite sources to support your position. APA format.

User Account

All Pages