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Forum: Biostatistics

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

  1. Question Nonparametrics, which test should I use?

    Hello. I am a veterinary student who is stuck in some statistics. I am doing an experiment with mice. I have two treatment groups and have...

    Started by Amana‎, 05-11-2012 08:12 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 7,084
    05-30-2012, 09:12 AM Go to last post
  2. help in data analysis for physiotherapy bachelor thesis

    Hi everyone! I'm new here, write from Italy so may you all accept my apologies for my english... hope to be understood anyway. I am graduating in...

    Started by mattiazambaldi‎, 09-20-2010 01:49 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 9,245
    09-23-2010, 10:29 PM Go to last post
  3. What do YOU mean by "statistically significant"?

    Here's a question more about communication than statistical methods. I've experienced that the term "statistically significant" is used often by...

    Started by jawon‎, 10-06-2008 06:19 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 13,553
    10-22-2008, 04:40 PM Go to last post
  4. What statistical test should I use?

    hello guys, I am doing some statistics and I am a little confused on which test is the most appropriate to calculate the P value. I have a...

    Started by scerab‎, 01-28-2011 12:13 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 14,549
    03-01-2011, 04:43 PM Go to last post
  5. Any statisticians out here please? £50 voucher offer

    I am doing a survey as part of my MSc project and need someone to review the protocol from a stats point of view, including helping to determine the...

    Started by brownbabygirl‎, 08-11-2014 03:13 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 16,700
    12-15-2014, 06:28 PM Go to last post
  6. Nonparametric data analysis

    I'm asking for advice. Topic of my research is brain iron accumulation. My task is the next . I have one dependent variable that is cathegorical and...

    Started by Mykola‎, 11-13-2017 03:24 PM
    2 Pages
    1 2
    confidence interval, corrections, logit, nonparametric, odds ratio., probability
    • Replies: 21
    • Views: 466
    11-18-2017, 07:59 PM Go to last post
  7. Analysing circular (angular) data - how to find significant differences?

    Dear users, this is a problem from my PhD thesis. I am grateful for suggestions. I have measured angular data from several individuals, each...

    Started by DEW‎, 03-06-2013 05:33 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,363
    03-12-2013, 07:23 AM Go to last post
  8. Choosing a sample size for a pilot study

    I am trying to figure out how to compute a sample size. Since this is a pilot scale study the results will likely not be definitive, but I want to...

    Started by hodag‎, 06-26-2013 03:32 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 10,055
    07-01-2013, 09:52 AM Go to last post
  9. STATA or SAS? Which one should I learn?

    Hello I am currently trying to go a little beyond SPSS by learning either SAS or STATA. My field is psychology and biostatistics. Which one of these...

    Started by sampier85‎, 01-07-2013 04:07 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 28,321
    03-11-2014, 11:50 AM Go to last post
  10. Flight times of insects

    I'm researching the flight times of a wasp in the southeast. The trap catches occurred in 09,20,11, and 12. However, these were done by three...

    Started by jhartsho‎, 03-09-2013 11:26 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,640
    03-23-2013, 08:58 PM Go to last post
  11. Minimum control size for determining effectiveness of treatment

    So the following scenario I have a treatment that I know to be effective, but I want to determine precisely how effective it in a (large) group...

    Started by xandalorian‎, 01-08-2016 08:27 AM
    2 Pages
    1 2
    control group, experiment design, significance, test
    • Replies: 15
    • Views: 2,152
    01-08-2016, 04:24 PM Go to last post
  12. Error Bars (Sample size variation issues!)

    Hi! I have done an experiment with a plant species, seeing how survival rate changes with drying time (0, 1, 2 and 3hours). I repeated my...

    Started by efj500‎, 08-28-2011 06:02 AM
    • Replies: 14
    • Views: 4,190
    08-29-2011, 11:32 AM Go to last post
  13. Want to run zero inflated regression... but my dependent variable is continous

    So I have been investigating the best model to run for my data. I originally looked at the zero inflated Poisson regression, but looked at my...

    Started by zombie_kid‎, 02-17-2014 11:29 PM
    • Replies: 14
    • Views: 2,925
    02-22-2014, 10:38 PM Go to last post
  14. Bias Question

    My statistics teacher and I are at a disagreement with an answer to one of his questions and I was wondering if you all could help me out. The...

    Started by jimsam321‎, 04-12-2017 04:55 PM
    • Replies: 14
    • Views: 1,416
    04-13-2017, 09:29 AM Go to last post
  15. Survival Analysis with Interval Censored Data

    Dear All I'm trying to do a survival analysis with interval censored data. The data are basically eye pressure measurements at certain...

    Started by SiBorg‎, 03-05-2012 12:37 PM
    • Replies: 13
    • Views: 11,647
    04-15-2014, 03:06 AM Go to last post
  16. Logistic Regression (very small proportion of 'yes')

    Hi Everyone, I am working on a logistic regression problem (injury predicted by air temperature and physical training program). Problem is that...

    Started by smh5154‎, 08-27-2013 12:40 PM
    • Replies: 13
    • Views: 2,549
    08-30-2013, 03:09 PM Go to last post
  17. Mean and SD of two means and SD

    If we have two groups of males, group 1: age >60 and group 2 <60. each of these groups have mean and SD; can we calculate a mean and SD for all...

    Started by docoftheworld‎, 08-02-2016 10:08 AM
    • Replies: 13
    • Views: 2,494
    08-04-2016, 11:36 PM Go to last post
  18. Is it really significant ?

    Hello, I ran a series of 100 t-tests and 100 Mann Whitnety U test, I had an "array" of 100 variables and I compare their values between healthy...

    Started by NN_STAT‎, 02-05-2012 02:47 PM
    • Replies: 12
    • Views: 3,654
    02-18-2012, 02:52 PM Go to last post
  19. Correct statistical design for Xray study

    Hi all, I'm putting together a simple study looking at two different xray programs and whether they affect clinical decision making for...

    Started by Korbah‎, 12-10-2012 07:58 AM
    • Replies: 12
    • Views: 3,077
    01-01-2013, 05:38 AM Go to last post
  20. Red face Continuous variable and its effect on dependent categorical variable, Which test?

    Hi, I question as a new SPSS user (I use version 20) I want to find a relation/correlation/association between an independent continous parametric...

    Started by ahmedhassan‎, 10-14-2013 06:38 PM
    • Replies: 12
    • Views: 3,047
    10-15-2013, 06:53 PM Go to last post
  21. Combining two ORs with the same control group

    Hi everybody. I am doing a meta-analysis of observational studies. As the disease I am working on has different stages, some of the studies reported...

    Started by amirh899‎, 07-16-2014 09:21 AM
    • Replies: 12
    • Views: 2,379
    07-17-2014, 01:19 PM Go to last post
  22. Calculating & Interpreting Cohen's D Effect Size

    Dear all, Im new to effect size & am struggling with some of the calculations, hence would like to seek some thoughts / advice. 1) Im calculating...

    Started by zeroX14‎, 02-02-2015 11:39 PM
    • Replies: 12
    • Views: 6,695
    02-04-2015, 06:58 PM Go to last post
  23. Parallel and subsequential diagnostic tests

    Hey guys, i just ran into a problem: I am having two predictive models: Model 1: Sensitivity: 0.8 Specificity: 0.4

    Started by lilchaos‎, 11-02-2016 09:25 AM
    • Replies: 12
    • Views: 3,946
    11-08-2016, 02:59 AM Go to last post
  24. Testing for trend

    I have following data that represent number of new patients with rare disease for subsequent 5 year time periods: 4, 3, 4, 2, 4, 2, 4, 6, 11 As I...

    Started by Markica85‎, 02-25-2017 09:25 AM
    • Replies: 12
    • Views: 4,238
    02-28-2017, 01:30 PM Go to last post
  25. Measuring strength of an association

    Hey guys, I'm a little stuck I'm trying to analyze the strength of an association between cancer remission (yes or no) versus number of pets (0-5). I...

    Started by Pineapple‎, 12-05-2010 08:20 PM
    • Replies: 11
    • Views: 7,532
    12-05-2010, 11:40 PM Go to last post
  26. Mixed Model for repeated measures

    Hello I ran a mixed model for a repeated measures analysis and I need some help interpreting the output. To start with, how do I interpret the...

    Started by NN_STAT‎, 05-12-2012 12:36 PM
    • Replies: 11
    • Views: 5,570
    05-15-2012, 12:51 PM Go to last post
  27. Birds - racial segregation - want to check my method please.

    I have data from four nearby sites, on Redshanks, (birds) that were captured and ringed during the winter over a 30-odd year period using two...

    Started by MW0CBC‎, 01-04-2013 12:49 PM
    • Replies: 11
    • Views: 2,168
    01-06-2013, 10:46 AM Go to last post
  28. Accounting for random effects from sampled individuals in GLM

    Hello, this is my first post but I am sure it won't be my last. I am working on my thesis and just sent the first round of analyses to my committee....

    Started by zombie_kid‎, 02-04-2014 09:32 PM
    • Replies: 11
    • Views: 2,255
    02-06-2014, 01:37 PM Go to last post
  29. biostatistics for ordinal variable

    The study is perspective. the subject is : the effect of an intervention on antibiogram level I will have a antibiogram value at (4: for...

    Started by parisaarzani‎, 11-08-2014 03:05 PM
    biostatistics, ordinal value, repeated measure
    • Replies: 11
    • Views: 2,557
    11-13-2014, 04:02 PM Go to last post
  30. Frequent ED attenders - statistical test

    Hi I've a problem at work and looking for some suggestions as to how to progress. We took a sample of 100 patients. For each patient we...

    Started by scotchpie‎, 08-26-2015 05:16 AM
    • Replies: 11
    • Views: 2,304
    08-27-2015, 08:30 AM Go to last post
  31. Multicollinearity in binary logistic regression

    I have two correlated independent variable and I need to use them both (one as a 'interesting' variable, other one as a control variable). Because of...

    Started by zxc‎, 01-07-2009 04:42 PM
    • Replies: 10
    • Views: 27,528
    01-19-2009, 10:03 PM Go to last post
  32. Masters thesis feedback from senior members/contributors

    Hi fellow members, The time has come for me to start work on my master's thesis in hopes that I'll be able to publish it in a peer reviewed...

    Started by Link‎, 11-02-2010 05:58 PM
    • Replies: 10
    • Views: 6,079
    03-04-2011, 06:51 PM Go to last post
  33. a series of T tests more appropriate than ANOVA here?

    Hi all, I'm writing up some experimental results, which I believe I know how to analyze, but wanted to get some frank and impartial feedback before...

    Started by BWGIA‎, 07-03-2011 09:18 PM
    anova, dunnett t test, t test
    • Replies: 10
    • Views: 6,736
    09-19-2015, 05:02 AM Go to last post
  34. Should I use an ANCOVA or two t-tests?

    Hi I'm studying the level of an ion in patients compared with matched controls. My results are categorized by gender and cohort/control...

    Started by victorxstc‎, 07-30-2011 06:36 PM
    • Replies: 10
    • Views: 14,917
    10-04-2011, 01:41 PM Go to last post
  35. [SOLVED] Medical Assignment

    I am working on a school assignment on medical data. I am trying to determine what test/methods to use on this assignment. I am using the date/time...

    Started by Medic49‎, 12-21-2011 12:25 AM
    • Replies: 10
    • Views: 2,600
    01-29-2012, 09:49 PM Go to last post
  36. Which test / model to use ?

    Hello I need help choosing the most appropriate test to use: I have 3 groups of treatments, one is the new therapy, one is an active control...

    Started by Yankel‎, 09-20-2012 08:46 AM
    • Replies: 10
    • Views: 2,668
    09-24-2012, 07:37 AM Go to last post
  37. Test for linear trend in odds ratio in linear regression

    I often see epidemiological studies where a continuous variable has been divided into quantiles and the odds ratios for each quantile compared with a...

    Started by Disvengeance‎, 07-13-2014 09:50 AM
    • Replies: 10
    • Views: 11,825
    09-04-2015, 01:16 PM Go to last post
  38. Relative risk

    The following comes from "Applied Medical Statistics Using SAS" 114-115. In it: p1 occurs when a disease is present when a risk factor is present...

    Started by noetsi‎, 09-11-2014 03:25 PM
    • Replies: 10
    • Views: 2,061
    09-15-2014, 10:36 AM Go to last post
  39. Test validity

    Hello friends, I'm really new at this, I'm in high school, and wanted your help to know how does someone check or calculate if a test is actually...

    Started by Pammy‎, 02-03-2015 04:15 AM
    • Replies: 10
    • Views: 2,817
    02-05-2015, 01:13 AM Go to last post
  40. Adjustment for Odds Ratios

    At present, I am working on a meta-analysis that observes the effect of physical activity for a disease (i.e. cancer). For each study we have used...

    Started by jle‎, 05-13-2015 06:24 PM
    • Replies: 10
    • Views: 2,037
    05-17-2015, 09:31 PM Go to last post
  41. Odds ratio and p-value

    could anyone plz help me out.... PRESCENCE OF INURY TO OCULAR ADNEXAE YES NO MILD 70 12 MODERATE ...

    Started by jacob‎, 09-04-2015 11:05 AM
    • Replies: 10
    • Views: 2,666
    09-04-2015, 08:48 PM Go to last post
  42. Red face Help with Cox Regression

    Hi all, it's my first time here, but I hope to be able to contribute to other threads soon. I'm working on a dataset at the moment, and need a...

    Started by researchworker‎, 12-08-2015 10:10 AM
    • Replies: 10
    • Views: 1,585
    12-09-2015, 03:49 PM Go to last post
  43. Calculating standard deviation from mean and P value

    I am doing a systematic review and one of the papers I am including has reported the data only as mean, sample size and P value. I need the mean and...

    Started by CMP‎, 06-22-2016 03:35 PM
    • Replies: 10
    • Views: 2,839
    06-24-2016, 10:10 AM Go to last post
  44. SAS Coding to find averages for every 60 observations

    Hi. I am working on an analysis for research on premature baby health. I ran into a SAS coding issue which I hope some of you can help me with. ...

    Started by Nives_ES‎, 07-28-2016 10:26 AM
    sas mean research coding
    • Replies: 10
    • Views: 1,618
    07-29-2016, 01:38 PM Go to last post
  45. Temporal Distribution of Death

    Dear all, I plan to conduct a study. The preliminary aim is to examine the temporal distribution of death of terminal cancer patients in hospice...

    Started by bestmic‎, 12-20-2016 06:40 AM
    • Replies: 10
    • Views: 4,520
    01-03-2017, 04:40 AM Go to last post
  46. Drowning in data

    I'm a GP, and am interested in performing better analysis on patient data. The raw data is around 100mb of data. I am fairly adept by now at...

    Started by gwionrhys‎, 09-02-2010 03:58 PM
    • Replies: 9
    • Views: 5,030
    09-28-2010, 05:05 PM Go to last post
  47. log linear model with zero entries

    Hi, I have a log linear model with 4 variables (3 dichotom and 1 ordinal). Some (let's say 5 of 2*2*2*4=32) entries are zero. These zeros random...

    Started by giordano‎, 11-22-2010 01:08 PM
    • Replies: 9
    • Views: 8,844
    11-25-2010, 04:45 AM Go to last post
  48. life tables: terminology...

    Hello! I'm working on relative survival and so, I'm using life tables. My problem concerns the terminology linked to these tables. Could you help...

    Started by lilly74‎, 03-14-2011 11:28 AM
    • Replies: 9
    • Views: 5,920
    03-24-2011, 10:15 AM Go to last post
  49. Cyclical Data Transformation

    For data that may look linear but is in fact cyclical (time most commonly), is there like a sine function based data transformation that has been...

    Started by greg.neyman‎, 06-05-2011 01:55 PM
    • Replies: 9
    • Views: 6,032
    07-06-2011, 04:41 PM Go to last post
  50. Trying to prove significant difference between algal biovolume data

    Hello everyone I would like if possible to ask a question regarding a part of the statistical analysis in my MSc project: Following the sampling...

    Started by manos1234‎, 08-04-2011 04:45 AM
    biovolume, non-parametric
    • Replies: 9
    • Views: 3,676
    08-05-2011, 02:59 AM Go to last post
  51. glm for risk ratio, endless loop

    Hi all, Thanks in advance for helping me with my problem :) Can someone please let me know how I can stop my GLM command from stalling? The...

    Started by petedigital‎, 10-28-2012 07:22 PM
    • Replies: 9
    • Views: 2,608
    10-31-2012, 02:15 AM Go to last post
  52. Ordinal regression vs Chi-Square

    Hey guys, I've finished analyzing my data for an article regarding decompresion in divers. My dependent variable is ordinal - 1-no recovery...

    Started by XPeriment‎, 08-16-2014 04:50 AM
    • Replies: 9
    • Views: 3,942
    08-17-2014, 01:08 PM Go to last post
  53. Parametric or Non-Parametric and why?

    I want to examine how three different treatments impact cytokine production in primary human cells (n=3) compared to an untreated control (example...

    Started by A.B‎, 09-22-2014 02:41 AM
    • Replies: 9
    • Views: 2,894
    09-22-2014, 01:20 PM Go to last post
  54. Total complications in both groups

    Hi, I have the following question: In my study I compare two kinds of surgery options. Group A has 9 patients and group B has 6 patients. When...

    Started by chabby‎, 03-31-2015 08:28 AM
    events
    • Replies: 9
    • Views: 1,781
    04-01-2015, 01:04 PM Go to last post
  55. Multiple imputation and ROC curve anlaysis

    Hi, I have searched extensively for a solution to the following problem, without success. I have used multiple imputation on SPSS 22 to create 5...

    Started by CE479‎, 03-31-2015 04:25 PM
    • Replies: 9
    • Views: 8,847
    04-02-2015, 12:36 PM Go to last post
  56. [R]: Mixed model for non-normal y with many 0s and some high values in nested design

    Dear all, I am currently writing my master thesis on the effect of a certain insecticide on bumble bee colonies. In particular I am testing...

    Started by master student‎, 08-05-2015 04:32 AM
    anova, mixed model, nesting, zero inflated, zeros
    • Replies: 9
    • Views: 2,916
    08-28-2015, 04:45 AM Go to last post
  57. One for the pros: conditional logistic regression discrepancy

    Ok here´s the problem. I am using R version 2.8.0 on a Windows XP machine. I am not a statistician. I am trying to perform a conditional...

    Started by pisti‎, 11-04-2008 12:14 PM
    • Replies: 8
    • Views: 8,288
    11-07-2008, 06:49 AM Go to last post
  58. median survival time

    Hello, I'm trying to plot a survival curve and I also need median survival time and 95%CI. I specifically need the 95% CI which is not easy to...

    Started by noob‎, 06-06-2010 05:08 PM
    • Replies: 8
    • Views: 15,910
    06-13-2010, 01:28 AM Go to last post
  59. Interpretation of Relative risk and confidence interval?

    There were fewer primary events in patients assigned to warfarin than in those assigned to aspirin (24, 1·8% per year vs 48, 3·8% per year, RR 0·48,...

    Started by nana0709‎, 08-28-2010 06:16 PM
    • Replies: 8
    • Views: 33,742
    04-01-2011, 02:10 AM Go to last post
  60. Non-parametric t-test

    Hi Everyone, I have a dataset made up of incubation periods for first-laid and second-laid eggs (nest is the sampling unit) that I want to compare...

    Started by mogetons‎, 04-01-2011 10:48 AM
    • Replies: 8
    • Views: 6,806
    04-01-2011, 02:58 PM Go to last post

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