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in this video i explain the log rank test we will go through what a log rank test is and how it is calculated the formulas used are from the very recommendable book survival analysis by david g kleinbaum and mitchell klein and with that i would say lets start with the first question what is the log rank test the log rank test is used in survival time analysis and compares the distribution of time to occurrence of an event of two or more independent samples but now step by step what does distribution mean what does time until an event occurs mean and what does two or more independent samples mean lets start from the back i would say with two or more independent samples with the log rank test you can test if there is a difference between two or more different groups for example whether there is a difference between two different materials used for a dental filling now the next question is in terms of what is there a difference the log rank test analyzes whether there is a difference i
