Question

please I know there is answer for this question but I want R input  

here is the package and data

/var/folders/64/t67pwpy165sbvnbgx6_yyznw0000gn/T//RtmpQmWnyp/downloaded_packages

Import the data set "prostateSurvival" from the "asaur" package in R software. The dataset contains survival times from prostate cancer diagnosis to death from prostate cancer (event of interest). Those patients who were alive at the end of the study or died from other causes are considered to be censored. Type in "?prostateSurvival" to see the description of variables used in the dataset. The variables of interest are "grade", "stage", "ageGroup", "survTime", and status" (a) Adjust the variable "status" to accommodate the type of censoring indicator that we use (b) Fit a Cox's proportional hazard model to the give data and answer the following questions (i) How does the hazard of a poorly differentiated patient compare to that of a moder- for a Cox's model [2 marks] (take the level of significance to be 0.05) ately differentiated patient [6 marks] (ii) Do you think the variable "stage" is significant in explaining hazards of different patients? Justify your answer by carrying out a suitable test of hypothesis. Make sure to draw appropriate conclusion from the test results [8 marks] (iii) Does the information-based criteria help you to draw similar conclusion. Explain (iv) Based on your conclusion in (ii) above, how would you compare the lifetime of (v) Since the variable "ageGroup" has four levels, you must have created three dummy your answer [5 marks] patients belonging to different stages [8 marks] variables corresponding to it. How would you comment on the three p-values corre- sponding to these three dummy variables. Is there any way you can come up with a general conclusion regarding "ageGroup"? [16 marks]

Answer 1

The variable state is adjusted in such a way that it accommodates the current scenario of the patient under going prostate cancer, that it contains all the data about the period of time the patient is undergoing the prostate cancer, his current health condition, the possible ways to recover from cancer etc poorly differentiated people are those who are affected by prostate cancer in a worse manner, that is they have crossed the states of being cured from cancer moderately differentiated people are those who have a chance of getting recovered from cancer yes of course the variable stage is essential for defining the current health condition of the patient tat is it indicates the stage (the level of prostate be cancer) of cancer the patient is undergoing \r\n For sure the information obtained from the above stages can be used to make further conclusion as the patient stage and