• 1. Implement Insert and Delete operation on Red-Black Trees
• 2. Why do we need a B-Tree? (Min. 2 pages)

Min 2 Pages, Excluding references 

Due 4/28/19  7 p.m EST

Be on time, Original Work, Know SPSS, READ Instructions before asking for work!!

Data Attached along with Step by Step Guide.

Cox Proportional Hazard is a regression technique that incorporates the element of time-to-event into the computation of a hazard ratio. A censoring variable is one for which information is only partially known. A time-to-event variable is one that encapsulates the time between starting a treatment and onset of a new event.

For this Assignment, you identify a censoring variable and a time-to-event variable. You also identify an independent variable that represents exposure status (with exposure or without exposure). You then conduct Cox Proportional Hazard regression analysis using these variables to compare survival times for those with and without the exposure. Finally, you interpret the output of the regression, including the testing of the assumption of proportionality and the hazards ratio. Use the Week 9 Dataset (SPSS Document)

The Assignment

1. Dataset 
   1. Access the dataset attached
   2. Identify the censoring variable, given that you wish to evaluate the event stroke.
   3. Identify the time-to-event variable and produce a frequency table to determine the presence of ties
   4. Identify the independent variable for exposure status, given the following research question: Is there an association between hypertension and the time a person was followed before experiencing a stroke?
   5. Create a table with the above variables and their role in this analysis. 
2. Test the assumption of proportionality 
   1. Use Kaplan-Meier in SPSS. Create a Hazard plot with time = followed, status=stroke, and factor = hypertension. 
   2. Interpret the results: Are the baseline hazards proportional and what does this mean in terms of your planned methodology? 
3. Use SPSS to run a Cox Proportional Hazards test 
   1. Use stroke as the event and hypertension as the factor. (be sure to identify hypertension as a categorical variable). Be sure to include the output in your submission. 
   2. Create a Hazard Plot for Hypertension (select separate lines) 
   3. Interpret the results. 
   4. Could the presence of ties in time followed (from the frequency table in 1c) affect the results? How might you accommodate ties in this analysis? 

 Discuss the textbook’s recommendations for improving business-IT communication. Provide examples from your own experience to support your ideas 

Using the Web or other resources, find a case where an illegal search was claimed.

Write a brief essay describing that case and how it relates to this week’s topic.

Discussion Question

Begin your discussion by sharing your problem statement and research question. Next, discuss your sampling plan. In addition, discuss your research design. Consider the following as you craft your response.

Sampling

How will the sample be selected?

What type of sampling method is used? Is it appropriate to the design?

Does the sample reflect the population as identified in the problem or purpose statement?

Is the sample size appropriate? Why or why not?

To what population may the findings be generalized? What are the limitations in generalizability?

Research design

What type of design will be used?

Does the design seem to flow from the proposed research problem, theoretical framework, literature review, and hypothesis?