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Forum: Biostatistics

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

  1. Patriotic Worms

    Hello all, I'm studying the Patriotic Worm… Patriotic Worms are made of RED and BLUE segments with an average of 100 segments per worm....

    Started by -P-‎, 10-10-2012 02:20 PM
    • Replies: 4
    • Views: 2,834
    10-12-2012, 02:29 PM Go to last post
  2. Shared variance across hemispheres of the brain

    Hello, I'm in the process of doing some data analysis for an MRI project I've been working on in clinical neuroscience. I'll try to lay out my...

    Started by 01kolasj‎, 09-03-2011 04:30 PM
    • Replies: 4
    • Views: 3,785
    09-24-2011, 05:56 PM Go to last post
  3. Post Estimates

    Compare point estimate to interval estimate

    Started by 0302‎, 08-10-2012 04:21 AM
    • Replies: 2
    • Views: 1,625
    08-10-2012, 07:14 PM Go to last post
  4. Multiple group stats - Protein Work - Anova or T-test

    Hi Everyone, I have a question that I'm stuck on. I think I know the correct way to do it but from what I see when I visually graph I don't believe...

    Started by 12_eggs‎, 07-27-2015 04:21 PM
    • Replies: 0
    • Views: 1,514
    07-27-2015, 04:21 PM Go to last post
  5. What test to use?

    Hey there, My first post here. I'm currently doing a course in uni which just goes through basic statistics and research methods. I am, however,...

    Started by 1337H4XXOR‎, 09-22-2012 08:57 PM
    • Replies: 2
    • Views: 1,823
    09-27-2012, 08:17 AM Go to last post
  6. Help interpreting an interaction in Binary Logistic Regression

    Firstly, thank you for taking the time to read my problem that I am having. The goal: interpret the direction of the interaction term. ...

    Started by 2+2=5‎, 06-25-2016 09:50 AM
    interaction effect, logisitic regression, logistic interaction
    • Replies: 3
    • Views: 1,100
    06-25-2016, 04:05 PM Go to last post
  7. Exclamation Help with Biostats Hw question

    The research team has considered your answers to the above. They’ve narrowed their interest to two outcomes (for now): Number of episodes of early...

    Started by 303oselim‎, 12-18-2015 08:00 PM
    biostats, stats
    • Replies: 0
    • Views: 1,224
    12-18-2015, 08:00 PM Go to last post
  8. Statistical test of difference among values from multiple timepoints

    Hello, I have a question on selecting a statistical test. I am trying to assess changing abundance of microbes in oral cavity along time. My...

    Started by 3toedsloth‎, 03-23-2016 05:25 PM
    • Replies: 0
    • Views: 1,118
    03-23-2016, 05:25 PM Go to last post
  9. Help! How to calculate difference between means +- SD

    Hi, My dissertation is due in the next 4 weeks, and what with it being distance learning and having other exams that I needed to do this year, I...

    Started by 5aboy‎, 07-17-2013 11:15 AM
    • Replies: 0
    • Views: 1,760
    07-17-2013, 11:15 AM Go to last post
  10. 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: 2,716
    11-25-2007, 12:23 PM Go to last post
  11. Help! Awkward hypothesis testing

    Hello, I desperately need some help with my project... If someone could help me, I would be very very grateful! I am comparing the different...

    Started by 87che87‎, 05-20-2012 05:51 PM
    • Replies: 1
    • Views: 1,827
    05-20-2012, 06:10 PM Go to last post
  12. analysis of the relationship between particulate air pollution and lung cancer

    Hi, I am currently doing a study on Lung cancer mortality and air pollution my hypothsis is to see if there is a link. i have 6 variables ( i...

    Started by 98107‎, 10-20-2010 11:46 AM
    • Replies: 3
    • Views: 5,445
    10-21-2010, 11:00 AM Go to last post
  13. Help in explaining my data, lung cancer- air pollution

    Hi, i am doing a ecological study of 402 distrcits from accross the UK to se wether Air pollution effects lung cancer mortalilty (measured in SMR) ...

    Started by 98107‎, 10-25-2010 05:48 AM
    • Replies: 2
    • Views: 3,386
    10-25-2010, 11:39 AM Go to last post
  14. multivariate ordinal probit regression with vglm()

    Hello, all. I'm investigating the rate at which skeletal joint surfaces pass through a series of ordered stages (changes in morphology). Current...

    Started by @nthRo‎, 03-22-2012 03:20 PM
    multivariate regression, probit
    • Replies: 0
    • Views: 1,333
    03-22-2012, 03:20 PM Go to last post
  15. 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: 2,891
    09-22-2014, 01:20 PM Go to last post
  16. Does this graph shows a normal distribution ?

    Hello, I am a newbie in Biostatistics field... I would be so thankful if you tell me if below chart has a normal distribution or not and why ? ...

    Started by A.Chakery‎, 11-21-2015 03:16 PM
    • Replies: 4
    • Views: 1,489
    12-10-2015, 11:32 AM Go to last post
  17. Comparing FISH scores

    hi there, Is there a statistical test I can do to prove that two FISH scores are reliable? Only one slide is used, with two independent...

    Started by a5027264‎, 02-03-2013 11:52 AM
    • Replies: 0
    • Views: 973
    02-03-2013, 11:52 AM Go to last post
  18. Accounting for spatial autocorrelation in neural network analysis in R

    Hi all, I have been exploring the use of neural networks to identify relationships between large numbers of differing species and the presence of...

    Started by AaronMo‎, 02-01-2014 06:07 AM
    neural networks, spatial autocorrelation
    • Replies: 0
    • Views: 1,100
    02-01-2014, 06:07 AM Go to last post
  19. Enrichment analysis between two sets of proteins

    I'm trying to calculate a statistical measure describing the overlap of two sets of proteins. The issue is that the sets are from different organisms...

    Started by aarstar‎, 05-14-2013 11:32 PM
    • Replies: 5
    • Views: 2,307
    05-15-2013, 02:09 PM Go to last post
  20. Help deciding paired vs unpaired t-test

    Hi, I am analyzing an experiment in which protein levels were examined in two different strains of bacteria. Lets call them A and B. Three...

    Started by abbey‎, 09-01-2016 01:37 PM
    comparison, t-test
    • Replies: 2
    • Views: 2,484
    09-01-2016, 02:19 PM Go to last post
  21. Seeking basic analysis help

    I have a question regarding an analysis of the number of defects found in products over a certain time period and whether or not a method to fix...

    Started by abelian‎, 06-15-2010 09:00 AM
    • Replies: 1
    • Views: 3,649
    06-15-2010, 10:39 AM Go to last post
  22. Matching 3 groups

    Hello everybody! I have 3 treatment groups and I need to match them on several criteria. However, I don't know the steps to do that, should I...

    Started by abelstat‎, 08-19-2014 04:44 AM
    • Replies: 0
    • Views: 1,258
    08-19-2014, 04:44 AM Go to last post
  23. Post Job: Health Economist/Economitrician/Biostatistician Required

    Health Economist Introduction This is an opportunity to work for an international company specialising in Health Economics, Patient-Reported...

    Started by abhijeetroy‎, 08-13-2012 05:37 AM
    biostatistician, career, econometrics, health economist, jobs
    • Replies: 0
    • Views: 1,546
    08-13-2012, 05:37 AM Go to last post
  24. Choice of Test for research data in Femur bone fracture analysis.

    Hello , I am Using SPSS on Windows 8 and SPSS Version 20. I have data regarding the Femur bone fracture strength on patients with Hip and knee...

    Started by AbhishekSPSS‎, 02-08-2014 07:10 AM
    • Replies: 4
    • Views: 1,947
    02-11-2014, 08:48 AM Go to last post
  25. Power analysis with one and two variables?

    Hi gang, I am severely illiterate in stats and so am struggling with what would seem to be a very straightforward problem. My problem: We...

    Started by ablum‎, 01-04-2017 04:18 PM
    • Replies: 1
    • Views: 2,862
    01-11-2017, 04:50 PM Go to last post
  26. Selecting appropriate statisitical analysis - research

    First, let me say that I am new to this forum. If I have missed any important steps or protocols, please let me know. A brief description of my...

    Started by aboveliquidice‎, 10-25-2011 04:30 PM
    • Replies: 3
    • Views: 2,112
    10-25-2011, 07:08 PM Go to last post
  27. Question regarding sample in EBP project

    Hi, I was hoping someone could provide me with some insight for an evidence based practice project I am working on. I'm currently appraising...

    Started by abreckenridge‎, 03-01-2016 01:46 PM
    • Replies: 1
    • Views: 1,140
    03-01-2016, 02:12 PM Go to last post
  28. 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: 3,683
    11-28-2007, 07:23 PM Go to last post
  29. Breakpoints in multivariate analysis: GLM or regression splines

    Hello all, I've been breaking my head over the following problem for some time now, but have been unable to solve it. I'm trying to asses the...

    Started by Abubakar‎, 05-21-2012 03:49 PM
    • Replies: 0
    • Views: 2,632
    05-21-2012, 03:49 PM Go to last post
  30. Post Which statistical test?

    Hey there, I have an experiment involving 2 groups of people: a control and a test. There were 30 different people in each group and the test group...

    Started by AC82‎, 12-12-2015 10:36 AM
    which statistical
    • Replies: 0
    • Views: 1,002
    12-12-2015, 10:36 AM Go to last post
  31. Modelling this non-linear relationship- please help

    Hi All, I'm using usual Cox regression where my outcome is time to a binary event. My variable of interest (a biological marker) appears to show a...

    Started by ACA‎, 04-07-2014 08:17 PM
    cox regression, non-linear relationship, quadratic, survival analysis
    • Replies: 0
    • Views: 1,725
    04-07-2014, 08:17 PM Go to last post
  32. Contingency tables with proportions only

    Hi, I have a 3x2 contingency table, which contains the observed and expected allele frequencies from a hypothetical population and I'd like to test...

    Started by Acather96‎, 05-04-2017 02:23 PM
    • Replies: 8
    • Views: 2,080
    05-04-2017, 05:59 PM Go to last post
  33. Logistic regression analysis and quantitative discrete variables

    Maybe I should start this post explaining that I am a physician working in the public health system in Brazil with little knowledge about the subject...

    Started by Acenes‎, 01-19-2014 12:49 PM
    • Replies: 4
    • Views: 3,773
    02-05-2014, 07:58 AM Go to last post
  34. confidence interval interpretation (diagnostic tests)

    If the 95% confidence interval for a relative risk (RR) or an odds ratio (OR) crosses 1, then this is taken as no evidence of an effect = NO...

    Started by adalpra‎, 08-10-2010 04:53 PM
    • Replies: 2
    • Views: 16,334
    08-10-2010, 08:40 PM Go to last post
  35. specificity and sensitivity..Please help

    Hi there, I have the following question A new test for cancer is evaluated. We have 1000 subjects. Amongst the group known to have cancer (598...

    Started by adam86‎, 10-02-2013 12:10 AM
    • Replies: 0
    • Views: 989
    10-02-2013, 12:10 AM Go to last post
  36. Study design issue: using national survey data as control group

    I'm working on a descriptive study of children who have specific health issues. Unfortunately, there is no good internal comparison group, so I'd...

    Started by adamsaa23‎, 10-31-2014 11:13 AM
    • Replies: 3
    • Views: 2,040
    11-13-2014, 11:07 PM Go to last post
  37. Matching Case-control study. Help Needed!

    Hi, I'm studying medical data. My case have Preterm Premature Rupture of Membranes and benefit of amniocentesis for detection of infection. My...

    Started by aesc‎, 05-04-2014 06:07 AM
    • Replies: 0
    • Views: 1,452
    05-04-2014, 06:07 AM Go to last post
  38. Question- student paired sample t test, wilcoxon signed rank test

    Hi, I have samples that are not expected to be normally distributed, I treat them with and without a compound and perform statistical analysis. I...

    Started by AggieTheBird‎, 01-26-2016 03:28 AM
    • Replies: 3
    • Views: 1,441
    01-31-2016, 02:58 AM Go to last post
  39. Randomized Study

    Suppose a pharmaceutical company wants to conduct a post-marketing clinical trial. It needs to recruit patients through retail pharmacies. Suppose...

    Started by aha123‎, 05-15-2011 03:45 AM
    • Replies: 2
    • Views: 2,230
    05-17-2011, 10:07 AM Go to last post
  40. which test should i use?

    Hi, if anybody could help with some Biological statisitics then this would be so great: I'm trying to analyse the significance of some cell culture...

    Started by aharrygeorge‎, 03-12-2009 01:29 PM
    • Replies: 3
    • Views: 2,712
    03-15-2009, 11:59 PM Go to last post
  41. 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: 3,038
    10-15-2013, 06:53 PM Go to last post
  42. KM curve

    Hi all, If I have a KM curve (survival vs years) and I have the number at risk each year (as well as hazard ratio for death over a median follow up...

    Started by ahmmri‎, 06-03-2015 06:20 PM
    • Replies: 3
    • Views: 2,169
    06-03-2015, 09:48 PM Go to last post
  43. Wink Reducing likert-type scales from 10 point scale to lower order point scal

    Have made lots of movement in looking at this project... Overall Aim: To construct a clinical medical image scales (10 images in scale)...

    Started by Ailariz‎, 06-12-2013 06:53 PM
    decision trees, likert-type scale, multiple raters, neural networks
    • Replies: 0
    • Views: 2,136
    06-12-2013, 06:53 PM Go to last post
  44. Adjustment for correlated data in meta-anlaysis

    Hi, I'm completing a systematic review and performing meta-anlaysis forest plots. The research question related to the finding of risk factors for...

    Started by Ainslie‎, 03-08-2017 12:47 AM
    adjustment, correlated data, meta-analysis
    • Replies: 2
    • Views: 1,897
    03-08-2017, 11:07 AM Go to last post
  45. Exclamation test with proportions

    hi :wave: i have chosen a consecutive sample for research. i want to apply hypothesis test for difference in proportions by dividing the data into...

    Started by aish‎, 12-21-2010 03:45 AM
    • Replies: 5
    • Views: 3,542
    12-25-2010, 02:28 PM Go to last post
  46. Help for master degree

    Good evening, I need your help I was admitted to the master programme in biostatistics in the university of glasgow, I was also admitted to the same...

    Started by Akaros‎, 04-24-2014 07:23 PM
    • Replies: 1
    • Views: 2,215
    04-24-2014, 08:44 PM Go to last post
  47. Poll Poll: URGENT..pls help with thesis

    Hi all, I have collected data of 100 patients who had low vision. All these patients were given a specific device and vision was noted before and...

    Started by aksh12‎, 11-30-2012 12:34 PM
    • Replies: 1
    • Views: 1,281
    12-01-2012, 04:29 AM Go to last post
  48. How many people have the disease based on the prevalence?

    Hi, I know that Prevalence=(persons with a given health indicator during a specified time period/ population during the same time period) X...

    Started by alanend‎, 02-10-2015 11:14 AM
    • Replies: 4
    • Views: 1,175
    02-10-2015, 12:19 PM Go to last post
  49. Assessing covariates to include in model

    Hi all, I have a couple of basic questions which would be great to get some help on I have a continuous outcome (brain volume: total and divided...

    Started by Alanine‎, 02-09-2017 10:47 AM
    • Replies: 2
    • Views: 1,965
    02-10-2017, 06:57 AM Go to last post
  50. Which test should I apply?

    Hi, I have a set of of things (SNPs) which explain a percentage of variance of a trait. I got a subset of those SNPs and they explain a higher...

    Started by AleixArnau‎, 07-30-2015 10:21 AM
    test question
    • Replies: 1
    • Views: 888
    07-30-2015, 11:37 AM Go to last post
  51. Which statistical test would you suggest in this case?

    Hello to everyone, I have a question on how to choose the best statistical test to see whether what I have found is significant or not. That is...

    Started by Alessiaa‎, 12-09-2015 11:55 AM
    • Replies: 0
    • Views: 900
    12-09-2015, 11:55 AM Go to last post
  52. 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
  53. Comparing proportion between categorical outcome variables, repeated measures design

    I am working on an observational prospective longitudinal study with a repeated measures design. The same categorical outcome is measured for five...

    Started by AlexLev‎, 06-02-2015 03:15 PM
    categorical variables, missing data, multivariate analysis, repeated measure, repeated measurement
    • Replies: 0
    • Views: 1,143
    06-02-2015, 03:15 PM Go to last post
  54. Comparing categorical outcome variables in repeated measures design

    I am working on an observational prospective longitudinal study with a repeated measures design. The same categorical outcome is measured for five...

    Started by AlexLev‎, 06-02-2015 03:19 PM
    categorical variables, missing data, multivariate analysis, repeated measure, repeated measurements
    • Replies: 0
    • Views: 1,368
    06-02-2015, 03:19 PM Go to last post
  55. Smile Which method i have to use?

    Dear my friend. I am working on research on supplement. I have 4 group in creatine supplement and placebo ( creatine+ exercise, creatine+ no...

    Started by ali127‎, 12-09-2011 06:47 PM
    mancova
    • Replies: 4
    • Views: 2,635
    12-09-2011, 11:11 PM Go to last post
  56. Poll: How do you handle subjects having very different patterns?

    Good day everyone - I am curious as to what you all do in these situations. If you are running a sleep study, and you are simply using two...

    Started by allie_moore‎, 09-26-2016 11:35 AM
    • Replies: 2
    • Views: 3,557
    09-26-2016, 12:14 PM Go to last post
  57. What Statistical Test to Use?

    I'm currently attempting to compare antibiotic resistance levels in two colonies of the same bacteria, but am having a hard time figuring out what...

    Started by Alloftheberries‎, 10-17-2012 01:08 PM
    • Replies: 1
    • Views: 1,534
    10-17-2012, 03:03 PM Go to last post
  58. subtract average values with SEM

    I have values of two groups, each has its own mean and calculated standad error of the mean (SEM): A +-SEM(A) B +-SEM(B) I wouls like to...

    Started by almagor‎, 09-12-2010 03:52 AM
    • Replies: 0
    • Views: 4,718
    09-12-2010, 03:52 AM Go to last post
  59. Average individual correlations or perform 1 set of correlations

    First of all thanks for your time reading this post. I got some issue with correlation analysis that I am not able to solve at all as for more...

    Started by aloik‎, 04-24-2015 07:44 AM
    • Replies: 0
    • Views: 855
    04-24-2015, 07:44 AM Go to last post
  60. Analysis of individual and pooled samples

    I have a small data set that includes individual and pooled samples. It looks like this: School A (one individual tested) Positive for infection:...

    Started by Alpha7383‎, 01-25-2013 02:13 PM
    • Replies: 4
    • Views: 1,953
    01-27-2013, 11:28 PM Go to last post

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