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Threads 1861 to 1890 of 1890

Forum: Biostatistics

Epidemiology and biostatistics, public health research. GLM, logistic regression, survival analysis, clinical trials.

  1. hello all, please help me choose the statistical test for my research

    I am looking at a database and would need help on what statistical test to use for my research project. There are four groups (for example cars...

    Started by mdme‎, 01-03-2008 12:07 PM
    • Replies: 2
    • Views: 4,106
    01-12-2008, 05:57 AM Go to last post
  2. Angry Null Hypothesis for OR

    I got this question: "In the background for this study, the authors mentioned that “Data from the Sleep Heart Health Study (Baldwin et al., 2001)...

    Started by abrenner‎, 11-28-2007 02:55 PM
    • Replies: 1
    • Views: 3,677
    11-28-2007, 07:23 PM Go to last post
  3. EBM Stats

    Hi everyone - my first post! Was wondering if anyone could help me. I am doing a project on the outcomes of a particular type of eye surgery...

    Started by 7up‎, 11-13-2007 07:30 AM
    • Replies: 1
    • Views: 2,714
    11-25-2007, 12:23 PM Go to last post
  4. Writing a Life Regression Model with Minitab Output

    Alrighty, I feel incredibly dumb here so please bear with me. :( I have the following output from minitab from a life regression. Now, what I want...

    Started by IronMan‎, 11-08-2007 05:20 PM
    • Replies: 1
    • Views: 3,861
    11-15-2007, 10:48 AM Go to last post
  5. Question I need so much help in statistics....I have alot of questions, please help me.

    Hi there, Im taking a statistics class online right now because Im going for a degree in Bio technology. When I comes to math I just get so confused...

    Started by megank‎, 11-11-2007 01:14 PM
    • Replies: 1
    • Views: 8,265
    11-12-2007, 11:18 AM Go to last post
  6. LD50 power analysis

    Hello all, I come from a biology background, and I wanted to ask a question. We have a value of LD50 (lethal dose), which is the dose at which 50%...

    Started by Shiranai‎, 11-08-2007 05:56 PM
    • Replies: 2
    • Views: 4,510
    11-09-2007, 02:22 PM Go to last post
  7. who can provide good forum about clinical trial data management and biostatistics?

    thank you very much!!!多谢大家啦!!!

    Started by orientaldream‎, 10-29-2007 11:08 PM
    • Replies: 0
    • Views: 5,804
    10-29-2007, 11:08 PM Go to last post
  8. Question Probit Analysis on Limited Data

    My problem is how to address data on mortality rates of spiders exposed to three temperatures. I have done probit to analyse similar data with...

    Started by kencil‎, 07-20-2007 10:29 AM
    • Replies: 4
    • Views: 4,000
    10-23-2007, 07:11 AM Go to last post
  9. Biostatistics

    Hi guys, Newbie here. From Malaysia. I am a medical doctor trying biostatistics. Anybody else with similar background? :D

    Started by DrJ‎, 10-08-2007 10:14 PM
    • Replies: 0
    • Views: 2,823
    10-08-2007, 10:14 PM Go to last post
  10. Exclamation Another Confidence Interval Qn!

    How do I do this? It is claimed that a new treatment for prolonging the lives of cancer patients is more effective than the standard one. The...

    Started by georgina_009‎, 10-02-2007 10:18 PM
    • Replies: 0
    • Views: 2,570
    10-02-2007, 10:18 PM Go to last post
  11. Question Reproducibility

    I was reading "Sample Size Calculations in Clinical Research", a book by Chow, Shao, and Wang. On p. 6 there is a table of the probability that a...

    Started by Michael Schmidt‎, 08-20-2007 10:42 AM
    • Replies: 0
    • Views: 3,113
    08-20-2007, 10:42 AM Go to last post
  12. Smile question about determining clinical significance cutof

    Hi, I have a parenting measure that I would like to construct a multinomial outcome from (4 categories). I am constructing it as follows from two...

    Started by sten‎, 08-16-2007 09:36 PM
    • Replies: 1
    • Views: 3,218
    08-16-2007, 10:21 PM Go to last post
  13. Backward logistic regression

    :wave: Hi ...This is my first posting. After reviewing the talkstats archives for info on regression analyses, I turn to talkstats subscribers for...

    Started by dataquest‎, 07-05-2007 05:48 AM
    • Replies: 4
    • Views: 7,777
    07-10-2007, 03:52 AM Go to last post
  14. undefined odds ration

    Hi everybody, i have a problem in calculation of odds ratio if one cells was zero. has any one any idea about how to calculate it? thank you for...

    Started by Ghada‎, 06-23-2007 02:35 PM
    • Replies: 6
    • Views: 7,944
    06-28-2007, 03:10 PM Go to last post
  15. Kaplan-Meier Survival Analysis - Why P-value of 0.10?

    Hi all..I've been searching for ages and I just can't work out why the kaplan0meier survival analysis in SPSS suggested using P-value of 0.10 as a...

    Started by shan‎, 05-28-2007 12:04 AM
    • Replies: 0
    • Views: 7,124
    05-28-2007, 12:04 AM Go to last post
  16. Statistics Question

    Andre is fearless circus performer who gets shot from a special cannon during the grand finale of the show and is supposed to land on a safety net at...

    Started by alexkeytone‎, 04-14-2007 05:40 PM
    • Replies: 0
    • Views: 3,509
    04-14-2007, 05:40 PM Go to last post
  17. Causal inferences in surveys??

    Hi, I am looking into the general problems of making causal inferences in surveys. There are a few points I am still confused: a)In what ways...

    Started by aquary‎, 01-08-2007 06:17 PM
    • Replies: 1
    • Views: 3,124
    01-10-2007, 05:27 PM Go to last post
  18. Unhappy Flora Z Statistic

    Hi, I am a Post-Graduate Surgical Resident working on my Thesis. I need to analyze my data using the 'Flora Z Statistic'. Unfortunately even the...

    Started by jipmerite‎, 01-05-2007 12:51 PM
    • Replies: 2
    • Views: 4,525
    01-07-2007, 12:14 PM Go to last post
  19. Logistic regression

    I'm studying for my comprehensive exams. I have read several texts on logistic regression and have found discrepancies between the definition and...

    Started by teanabeana‎, 12-20-2006 05:21 PM
    • Replies: 0
    • Views: 3,046
    12-20-2006, 05:21 PM Go to last post
  20. Looking for some assistance

    The project is on testing for measles and how your antibody levels have to be greater than the cut off value in order for you to test positive. ...

    Started by monthecelts‎, 11-23-2006 12:42 PM
    • Replies: 0
    • Views: 2,988
    11-23-2006, 12:42 PM Go to last post
  21. How to test for differences between sevaral factors

    Hi there, quite new to stats and was wondering whether someone can help with this? I've just finished an experiment investigating the survival...

    Started by Tt3‎, 11-15-2006 08:00 PM
    • Replies: 0
    • Views: 2,292
    11-15-2006, 08:00 PM Go to last post
  22. time dependent covariate transplant analysis

    I need to analyse data where i need to look at survival of patients on transplant waiting list , some of whom have received transplants. I need to...

    Started by kallady43‎, 11-09-2006 06:07 AM
    • Replies: 0
    • Views: 2,739
    11-09-2006, 06:07 AM Go to last post
  23. Calculating significance for indepent samples

    Hello to you all. I would be very happy if anyone would mind helping me with a little problem I have encountered whilst doing some research. I am...

    Started by Orthoteer‎, 09-16-2006 02:31 AM
    • Replies: 2
    • Views: 3,079
    09-17-2006, 10:29 PM Go to last post
  24. Sensitivity and z scores

    Can I compare the sesitivities of two tests using the Z test? THanks

    Started by lostinspace‎, 08-09-2006 04:46 PM
    • Replies: 1
    • Views: 3,374
    08-10-2006, 11:27 PM Go to last post
  25. Matched analysis for ordinal data

    Hi folks, I have data from a matched case-control study (4 controls per case). Matching is on age and gender. Using Epi-Info and SPSS I am...

    Started by Peter Horby‎, 02-22-2006 09:55 PM
    • Replies: 2
    • Views: 4,463
    02-22-2006, 11:32 PM Go to last post
  26. Odds ratios

    Hi John: I just want to understand the term ORs. In logistic regression, we have ORs as effect size, correct? And also, we can calculate ORs based...

    Started by Susanbwh‎, 02-21-2006 12:32 PM
    • Replies: 1
    • Views: 4,945
    02-21-2006, 12:41 PM Go to last post
  27. Help

    Ok Guys not sure if I'm looking at these questions rite... can someone give me there opion of the correct answers? Thanks! The t test for...

    Started by chadxc1‎, 11-14-2005 06:45 PM
    • Replies: 1
    • Views: 7,388
    11-14-2005, 08:04 PM Go to last post
  28. Iam stuck with this tough question

    Dear admistrator, Thanks for help me with this hursh course , please my assignment will be after less than 18 hours, so Iam looking forward toe...

    Started by mousa‎, 10-17-2005 02:40 PM
    • Replies: 1
    • Views: 3,233
    10-17-2005, 02:53 PM Go to last post
  29. best biostatistics textbook?

    I have Health and Numbers. I'd like to get another book to supplement. Recommendations? Looking for clear and simple! Thanks!

    Started by kalbright36‎, 09-29-2005 09:58 PM
    • Replies: 3
    • Views: 12,697
    10-05-2005, 11:26 PM Go to last post
  30. How to interpret the results?

    Hello Sir or Madam,and all guys, Tomoorow i have to handin my answers on exam , and unfortunately ,i have this question , i can not answer , i will...

    Started by maysa‎, 09-29-2005 01:27 AM
    • Replies: 2
    • Views: 7,179
    09-29-2005, 12:10 PM Go to last post

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