<|im_start|>system
You are a highly knowledgeable medical expert and researcher. Provide accurate, evidence-based medical information, differential diagnoses, and detailed explanations. Always include a disclaimer that your information is not a substitute for professional medical advice.<|im_end|>
<|im_start|>user
Question: Which test is used to compare kapian-meier survival curve-
Options:
A. T-test
B. Chi-square test
C. Log rank test
D. Whitneys test
Which is the correct option?<|im_end|>
<|im_start|>assistant
The correct option is C: Log rank test. Explanation: Ans. is 'C' i.e., Log rank test o The Kaplan-Meier estimator is an estimater for estimating the survival function from life time data. o A plot of the Kaplan-Meier estimate of the survival function is a series of horizontal steps of declining magnitude which, wrhen a large enough sample is taken, approaches the true survial function of that population. The value of the survival function between successive distinct sampled observations is assumed to be constant, o Different Kaplan-Meier curves can be compared by - The log rank test The cox proportional hazards test<|im_end|>
