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What is the difference between Proc Lifetest and proc Phreg?
PROC LIFETEST is a nonparametric procedure for estimating the dis- tribution of survival time and testing the association of survival time with other vari- ables. PROC LIFEREG and PROC PHREG are regression procedures for modeling the distribution of survival time with a set of concomitant variables.
What is ODS output in SAS?
The ODS OUTPUT statement creates the SAS data set EnergyOutput from the output objects that PROC TABULATE produces. The name of each output object is Table. You can determine the name of the output objects by using the ODS TRACE ON statement. Create output data sets and an HTML report.
What are the two methods of survivor functions for which proc Lifetest produces estimates?
The LIFETEST procedure can be used to compute nonparametric estimates of the survivor function either by the product-limit method (also called the Kaplan-Meier method) or by the life-table method (also called the actuarial method).
What is SAS SQL?
PROC SQL is the SAS @System’s implementation of Structured Query Language, which is used for retrieving and updating data in relational tables and databases. PROC SQL also has substantial data manipulation and summarization capabilities.
How to use survivor function in Proc phreg?
The COVARIATES= option in the BASELINE statement specifies the data set that contains the set of covariates of interest. The PLOTS= option in the PROC PHREG statement creates the survivor plot. The OVERLAY suboption overlays the two curves in the same plot. If the OVERLAY suboption is not specified, each curve is displayed in a separate plot.
Which is an example of proc lifetest 9.2?
This example highlights some of the new features of PROC LIFETEST for SAS 9.2, especially the survival plot with number of subjects at risk and multiple comparisons of survival curves. In the following DATA step, data of 137 bone marrow transplant patients extracted from Klein and Moeschberger ( 1997) are saved in the data set BMT .
What do you need to know about SAS Survival analysis?
This seminar introduces procedures and outlines the coding needed in SAS to model survival data through both of these methods, as well as many techniques to evaluate and possibly improve the model. Particular emphasis is given to proc lifetest for nonparametric estimation, and proc phreg for Cox regression and model evaluation.
How is Proc phreg used in the Cox model?
PROC PHREG The PHREG procedure fits the proportional hazards model of Cox (1972, 1975) to survival data that may be right censored. The Cox model is a semiparametric model in which the hazard function of the survival time is given by