Please explain why we used the Fischer exact test in question number 6 when comparing the histopathological types between the 2 groups. Is it because one of the values is 0?
Week 7 & 8 Exercises (B)
Look at the abstract and table 1 and determine the proper statistical test that should be used of evaluation of the following variables:
Thanks for the great lectures, and I apologize for running behind schedule.
I have a question, and I hope you can help me to understand it. Why did we use the stent t-test to compare the serum PSA in the 2nd paper despite the non-normally distributed values of Serum PSA level (ng/ml) and mean (SD) as follows, 10.2 (10.3) in the first group and 10.8 (9.8) in the second group?
Thank you very much for your very cleaver question. There are 2 mistakes in this calculation. The first mistake is a wrong presentation of the variable of PSA because it clearly seems that it is non-normally distributed variable because double standard deviation is bigger than the mean. So, it must be presented as median and range and not as mean and standard deviation. Under such condition, the authors must use Mann-Whitney test instead of Student’s T test to calculate significance, and this is the second mistake inflicted by the authors.
I am so happy by your comment because it reflects how the authors do mistakes during writing their articles. The ability of the reader to catch the mistakes is one of the objectives’ of this course and it seems that you catch the knowledge properly. I thank you very much and I do recommend that all the participants read this question and its answer to enhance and consolidate their knowledge.
Dear Participants I am ready to receive your questions and comments. Please go in and be a part of this discussion. Please let me know your impression.
Please explain why we used the Fischer exact test in question number 6 when comparing the histopathological types between the 2 groups. Is it because one of the values is 0?
Week 7 & 8 Exercises (B)
Look at the abstract and table 1 and determine the proper statistical test that should be used of evaluation of the following variables:
Dear Professors,
Thanks for the great lectures, and I apologize for running behind schedule.
I have a question, and I hope you can help me to understand it. Why did we use the stent t-test to compare the serum PSA in the 2nd paper despite the non-normally distributed values of Serum PSA level (ng/ml) and mean (SD) as follows, 10.2 (10.3) in the first group and 10.8 (9.8) in the second group?
Dear Dr. Kirolos
Thank you very much for your very cleaver question. There are 2 mistakes in this calculation. The first mistake is a wrong presentation of the variable of PSA because it clearly seems that it is non-normally distributed variable because double standard deviation is bigger than the mean. So, it must be presented as median and range and not as mean and standard deviation. Under such condition, the authors must use Mann-Whitney test instead of Student’s T test to calculate significance, and this is the second mistake inflicted by the authors.
I am so happy by your comment because it reflects how the authors do mistakes during writing their articles. The ability of the reader to catch the mistakes is one of the objectives’ of this course and it seems that you catch the knowledge properly. I thank you very much and I do recommend that all the participants read this question and its answer to enhance and consolidate their knowledge.
Thank you so much my dear professor !
Dear colleagues,
I’m here to help.
Dear Participants
I am ready to receive your questions and comments. Please go in and be a part of this discussion. Please let me know your impression.