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Forum: Biostatistics

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

  1. Median follow Up shorter than median over all survival, possible?

    Hello, I calculated overall survival and median follow up with Kaplan Meyer. In particular follow up was calculated as inverse of overall...

    Started by greeklatin‎, 01-22-2015 09:04 AM
    • Replies: 2
    • Views: 5,509
    01-22-2015, 11:15 AM Go to last post
  2. Project Issue.

    I am a student of statistics discipline. I have to conduct a project which i can apply in society or nation. My preferable topics are...

    Started by Cynderella‎, 01-22-2015 04:55 AM
    applied statistics, biostatistics, project, research for thesis, self-study
    • Replies: 0
    • Views: 1,364
    01-22-2015, 04:55 AM Go to last post
  3. Which test to use?

    Hello guys, I am conducting a study to evaluate the effect of supplementation on serum vitamin levels. There are four categories based on the...

    Started by bsing82‎, 01-20-2015 01:48 AM
    • Replies: 5
    • Views: 1,590
    01-21-2015, 04:49 AM Go to last post
  4. Determining seasonal sample size

    I intend to deploy a new sonar system at our weir to help us count migrating fish. This new system cannot identify gender. We have six years of...

    Started by KellyD‎, 01-20-2015 04:07 PM
    • Replies: 0
    • Views: 988
    01-20-2015, 04:07 PM Go to last post
  5. Help finding appropriate test when observations are non-independent

    I have a data set consisting of data from 7 islands. I have measured the average gene flow between each pair of islands as well as the difference in...

    Started by mlogan1983‎, 01-20-2015 12:23 PM
    biostatistics, correlation, independence, non parametric, pairwise comparisons
    • Replies: 0
    • Views: 1,006
    01-20-2015, 12:23 PM Go to last post
  6. Struggling with this power/effect size analysis, any help?

    Hello all, I am trying to calculate the effect size or power analysis for this study to assess my probability to detect a phenomenon/change, here are...

    Started by Ralph84‎, 01-20-2015 06:40 AM
    • Replies: 0
    • Views: 1,499
    01-20-2015, 06:40 AM Go to last post
  7. Question Ecology: how to compare "intrinsic growth rates" (r)

    Hi everybody, I would like to know how to statistically compare different "intrinsic growth rates", most of the times named "r", belonging to...

    Started by Reset85‎, 01-19-2015 11:13 AM
    ecology, ecotoxicology, euler-lotka, intrinsic growth rate, toxicology
    • Replies: 0
    • Views: 1,247
    01-19-2015, 11:13 AM Go to last post
  8. Locating significantly different data points in a sample

    Hi, I have question regarding some data I collected recently which can be represented as plain integers (basically the number of features (dots)...

    Started by mxs‎, 01-18-2015 02:32 PM
    • Replies: 3
    • Views: 1,922
    01-19-2015, 06:32 AM Go to last post
  9. [Study design] is this a version of crossover design

    Hello, I came across a set of data comparing 2 medical approaches in terms of several continuous variables (Primary objective is compare A to B). ...

    Started by drmb‎, 01-16-2015 08:37 AM
    • Replies: 0
    • Views: 1,246
    01-16-2015, 08:37 AM Go to last post
  10. [Clustered Robust Standard Error] - Custering

    I am investigating the effects of age and exercise in protein expression in mouse motor neurons. I have four groups each with a limited number of...

    Started by brajo083‎, 01-15-2015 06:06 PM
    cluster analysis, logistic regression, regression, robust
    • Replies: 1
    • Views: 1,272
    01-15-2015, 08:41 PM Go to last post
  11. Thankfor for help in evaluating survival prognosis

    Hi! I'am investigating into the survival between two cohorts of incident patients. One historical (1986-1996) and one contemporary (2002-2012). I...

    Started by polarkakan2‎, 01-14-2015 04:51 PM
    • Replies: 1
    • Views: 2,544
    01-14-2015, 06:56 PM Go to last post
  12. Post Need help for selecting method

    I have a 4-group of data.in each group,there are 2 subcolumns which are before and after treatment.to analyse this which statistical method should I...

    Started by Yusupjan‎, 01-13-2015 05:01 PM
    • Replies: 1
    • Views: 1,445
    01-14-2015, 03:14 PM Go to last post
  13. Disproportional Sampling for Uneven Case Controls

    Hello, I am looking to do a random sampling analysis of a case/control dataset containing 6X as many controls as cases. Therefore, I need to...

    Started by rdoan‎, 01-13-2015 09:33 AM
    case control, disproportional sampling, random sampling, sampling
    • Replies: 0
    • Views: 1,334
    01-13-2015, 09:33 AM Go to last post
  14. Help on bachelor's thesis!

    Hey everyone! I'm trying to analyse my bachelor's thesis data in SPSS, but I'm not entirely confident I'm using the right methods. Could you...

    Started by Scoltey‎, 01-12-2015 05:04 AM
    • Replies: 0
    • Views: 1,608
    01-12-2015, 05:04 AM Go to last post
  15. Type 1 or type 3 analysis?

    I'm trying to fit various models (I had been doing negative binomial, but then had to switch to Poisson in some cases because of the model being...

    Started by wernie07‎, 01-11-2015 01:11 PM
    • Replies: 0
    • Views: 2,735
    01-11-2015, 01:11 PM Go to last post
  16. Use of tnm as continuous variable in univariate or multivariate analysis

    Hello, I hope I put this post in the correct group. May I use TNM stage (1,2,3....), N stage (0,1,2,3.....) or grade (1,2,3,4....) as...

    Started by greeklatin‎, 01-08-2015 02:00 PM
    • Replies: 2
    • Views: 1,610
    01-09-2015, 03:56 AM Go to last post
  17. Multiple imputation

    I am doing a research about Aids in my city in Yemen. Unfortunately I have many missing data . So I used SPSS multiple imputation. I am not sure...

    Started by Alyamani‎, 01-07-2015 07:29 AM
    • Replies: 2
    • Views: 1,921
    01-08-2015, 01:22 AM Go to last post
  18. Using survival analysis to predict scope of truncated data

    I'm not sure I'm thinking about this correctly, and would be grateful for any insight as I think the problem is analogous to one that comes up in...

    Started by rboucherdata‎, 01-07-2015 05:30 PM
    event history analysis, forecasting, survival analysis, truncation
    • Replies: 0
    • Views: 2,060
    01-07-2015, 05:30 PM Go to last post
  19. Help with kaplan meier analysis in SPSS

    HI! Thank you very much in advance for helping with my post! I am a phd student, I do surgical research at the carotid artery. My current...

    Started by phdSPPShelp‎, 01-04-2015 09:59 AM
    biostatistics, spss, survival analysis
    • Replies: 2
    • Views: 2,771
    01-07-2015, 05:13 PM Go to last post
  20. Question about population matching procedure

    Good evening everyone, I am currently conducting a clinical trial where I am taking an intervention population (which is referred to a new...

    Started by cardgage‎, 01-06-2015 10:42 PM
    matching, matching data
    • Replies: 1
    • Views: 1,697
    01-07-2015, 02:56 AM Go to last post
  21. limts and probability

    I am looking at code and I do not understand it. The values T and R are natural logs and the expression given is (T-R)^2 -(std error)^2. I do ...

    Started by Angus McLean‎, 01-06-2015 06:28 PM
    • Replies: 1
    • Views: 1,400
    01-06-2015, 09:48 PM Go to last post
  22. Prediction versus Association: what's the difference?

    Hi! I wonder how to evaluate the performance of the tools that associate a variable (example: SNP, gene...) with a phenotype. In a few papers ,...

    Started by scratchscratch‎, 12-29-2014 06:17 AM
    • Replies: 0
    • Views: 3,234
    12-29-2014, 06:17 AM Go to last post
  23. little help, incidence rate with lost to follow-up

    hi there, i hope you can help me. I am studying for a test and there is an answer that i cannot solve... it asks to calculate the annual incidence...

    Started by onosonussen1‎, 12-24-2014 07:25 AM
    incidence rate, lost to follow-up
    • Replies: 1
    • Views: 1,904
    12-24-2014, 09:44 AM Go to last post
  24. ANOSIM: significant p-value and small R-value. How?

    I am analyzing data of a large sample size ('000's of samples) via one-way ANOSIM. Results appear contradictory: Highly significant p-value...

    Started by dt87‎, 12-21-2014 11:22 PM
    • Replies: 5
    • Views: 9,563
    12-22-2014, 10:21 PM Go to last post
  25. Repeated measures or two-way ANOVA ? + sample size estimation

    A sample of patients will undergo two treatments. Each patient will receive both treatments.One treatment will on the left side and the other...

    Started by Logician‎, 12-21-2014 07:40 AM
    • Replies: 3
    • Views: 2,815
    12-21-2014, 04:40 PM Go to last post
  26. case control study

    i want to do a study i have with me serum cholesterol levels of patients with intracerebral hemorhage and infarcts other studies some say low...

    Started by valsa‎, 12-21-2014 02:07 AM
    • Replies: 1
    • Views: 1,777
    12-21-2014, 09:03 AM Go to last post
  27. Unhappy A dumb question about univariate analysis (repost from applied statistics)

    Hello I'm quite dumb regarding statistics, but i really am looking for a simple answer to a simple question. the question is: how do i explore data...

    Started by Kimboz‎, 12-19-2014 04:05 AM
    • Replies: 2
    • Views: 1,672
    12-19-2014, 05:54 AM Go to last post
  28. Two-proportion z test: is it best for my problem, and can I pool data?

    I am examining populations (cultures) of yeast cells and scoring them for a particular trait. The data is categorical; within a population, a yeast...

    Started by dmcameron‎, 12-18-2014 04:24 PM
    pooling data, proportion test, z-test
    • Replies: 0
    • Views: 1,255
    12-18-2014, 04:24 PM Go to last post
  29. Repeated-measure ANCOVA

    Hi there, I'm looking at a study which is measuring the effect of medication A on aggressive behaviour over time, after they have failed...

    Started by cheoksoon‎, 12-16-2014 05:20 AM
    • Replies: 0
    • Views: 1,527
    12-16-2014, 05:20 AM Go to last post
  30. 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: 16,625
    12-15-2014, 06:28 PM Go to last post
  31. Salmon gender

    During the salmon run we have a daily count of fish, males and females. I want to determine if there is an equal probability each day of getting an...

    Started by KellyD‎, 12-11-2014 06:16 PM
    • Replies: 6
    • Views: 2,899
    12-13-2014, 05:46 AM Go to last post
  32. clinical trial interpretation

    Hi! given two randomised clinical trials, the first compare treatment A vs B; the second compare treatment A vs B vs C. after enrolment, the...

    Started by stator‎, 12-12-2014 02:32 PM
    clinical trial
    • Replies: 5
    • Views: 1,734
    12-12-2014, 07:57 PM Go to last post
  33. Preparing for Meta Analysis

    Hello Everybody, I am a physician and a researcher, have been studying the meta-analysis subject for a while now, and we are in the process to...

    Started by messadua‎, 11-15-2014 07:30 AM
    database, diagnostic test, meta analysis, predictors, structure
    • Replies: 1
    • Views: 2,044
    12-12-2014, 05:12 PM Go to last post
  34. Compare 2 tests - Bland Altman vs. area under curve

    Hello, I want to compare the performance of 2 binary classification tests (positive vs. negative diagnosis) from the same sample (n=430). I have...

    Started by finnakerstrom‎, 12-09-2014 04:15 PM
    bland-altman, roc curves
    • Replies: 6
    • Views: 2,041
    12-10-2014, 01:54 AM Go to last post
  35. Smile Where Do I Start?

    I need assistance with the following problem: In 1960, census results indicated that the age at which American men first married had a mean of...

    Started by sditizio‎, 12-09-2014 12:12 AM
    • Replies: 3
    • Views: 2,130
    12-09-2014, 08:00 AM Go to last post
  36. Normality assumption for ARIMA analysis

    I have two time series that I wish to quantify their relationship using arima analysis. Both data series are not normally distributed, even after...

    Started by SandraC‎, 12-07-2014 06:13 AM
    • Replies: 0
    • Views: 1,420
    12-07-2014, 06:13 AM Go to last post
  37. Help needed, linear regression SPSS for birthweight controlling for maternal age

    Hello all, I am in need of help. I am performing a study looking at the effects of Assisted Reproductive Technology on birthweight, and I would...

    Started by ironslave‎, 12-05-2014 11:07 AM
    • Replies: 0
    • Views: 1,237
    12-05-2014, 11:07 AM Go to last post
  38. Power Calculation

    I will admit that I have not sat around racking my brain on this one, but thought it may be nice to get some input. I was enlisted to help out...

    Started by hlsmith‎, 03-11-2014 10:46 AM
    • Replies: 4
    • Views: 1,929
    12-05-2014, 04:17 AM Go to last post
  39. Follow-up tests with 2-way within-subject repeated measures ANOVA

    Hi everybody, I've been doing a 2-way within-subject repeated measures ANOVA and I have some questions: 1) Is it correct that I'm only...

    Started by Eric2014‎, 12-04-2014 12:19 PM
    anova, follow-up, t-test
    • Replies: 0
    • Views: 1,304
    12-04-2014, 12:19 PM Go to last post
  40. data exploration continue dependent variable or categorical dependent variable ?

    Hello everyone if you are give a data set with age ask outcome(dependent variable) but in the data set age has two scale categorical and...

    Started by dockiss‎, 12-04-2014 05:32 AM
    • Replies: 0
    • Views: 1,529
    12-04-2014, 05:32 AM Go to last post
  41. How can I obtain contrast statment for linear trend test ?

    Hi, I hope someone can explain this to me. I have obtained the following from the SAS website, but I cannot apply it to my data where I have 11 dose...

    Started by Bracknell‎, 11-27-2014 06:18 AM
    • Replies: 3
    • Views: 6,388
    12-02-2014, 09:18 AM Go to last post
  42. Should I use a two sample or paired t.test?

    Hello, Ive just wanted to post one simple question. I am comparing the removed area through endonasal approach in left or right side. It means,...

    Started by emilio.gonzalez.martinez‎, 11-23-2014 05:44 PM
    comparing, paired test
    • Replies: 5
    • Views: 1,833
    11-28-2014, 07:40 AM Go to last post
  43. Cox-analysis: right approach in this case?

    Hello all, I would be interested in your thoughts about whether this approach sounds correct to you or not. I have data of a cohort of subjects...

    Started by Ralph84‎, 11-28-2014 06:19 AM
    • Replies: 0
    • Views: 1,293
    11-28-2014, 06:19 AM Go to last post
  44. Paired t test or two sample ANOVA

    Hi, The experiment is investigating whether IQ changes based on certain training (there are 2 courses and a control - nothing). I have the IQ of...

    Started by roosterrocky‎, 11-26-2014 07:19 PM
    • Replies: 2
    • Views: 1,746
    11-27-2014, 01:03 PM Go to last post
  45. Which tests and steps to do?

    Hey there! I am new to this so I would really really appreciate any help! I haven't got statistical education but still I have to use it, so I want...

    Started by Veronikite‎, 11-27-2014 04:49 AM
    • Replies: 0
    • Views: 1,140
    11-27-2014, 04:49 AM Go to last post
  46. Where can I access the actual DATA used from medical studies?

    Hello, I have a project in my regression class where I need to find 2 studies that used regression analysis, and I need to reproduce their...

    Started by BearJewJ‎, 11-16-2014 12:59 PM
    • Replies: 3
    • Views: 1,419
    11-18-2014, 10:53 AM Go to last post
  47. Test to look at increasing admission incidence in a population

    We are trying to establish if a significantly higher proportion of obstetric patients in our hospital are being admitted to intensive care than...

    Started by RikThomas‎, 11-14-2014 03:10 PM
    • Replies: 0
    • Views: 1,198
    11-14-2014, 03:10 PM Go to last post
  48. 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: 2,034
    11-13-2014, 11:07 PM Go to last post
  49. Confounder analysis for LOGISTIC regression

    Hi there, I have the following situation: I have a logistic regression analysis, in which I have 3 variables: The dependent variable- dichotomous-...

    Started by yohayohay‎, 11-09-2014 05:30 AM
    confounders, continous variable, logistic regression
    • Replies: 2
    • Views: 1,697
    11-13-2014, 11:01 PM Go to last post
  50. 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: 2,547
    11-13-2014, 04:02 PM Go to last post
  51. Statistical significance in reproducibility study

    Thanks for taking the time to read this thread and help me out! I recently carried out a reproducibility study in which 15 observers from 4 groups...

    Started by reproducibilityhelp‎, 11-09-2014 05:28 PM
    • Replies: 0
    • Views: 1,459
    11-09-2014, 05:28 PM Go to last post
  52. Predicted vs. actual survival

    Hi guys, I am trying to do the statistics part myself for a project which looks at ability of a model to predict survival in patients. For the...

    Started by jhm3‎, 11-07-2014 06:49 PM
    • Replies: 0
    • Views: 1,190
    11-07-2014, 06:49 PM Go to last post
  53. Comparing blood levels at 2 time points between 2 groups

    Hey everyone, I'm incredibly inexperienced when it comes to biostatistics. For my bachelor's thesis, I need to do statistical analyses, and I want...

    Started by Scoltey‎, 11-07-2014 09:16 AM
    • Replies: 1
    • Views: 1,673
    11-07-2014, 09:28 AM Go to last post
  54. Age-adjusted Cumulative incidence

    Hello, Somebody knows what is the method to calculate an age-adjusted cumulative incidence for a clinical event? Also, could you tell me if...

    Started by didye‎, 11-06-2014 01:34 PM
    • Replies: 1
    • Views: 1,433
    11-06-2014, 04:32 PM Go to last post
  55. Is this linear mixed effect repeated measures?

    I'm looking for some clarity on the following. This experiment tested the null hypothesis that 2 methods for measuring the length of an animal...

    Started by dt87‎, 11-04-2014 09:13 PM
    • Replies: 0
    • Views: 1,305
    11-04-2014, 09:13 PM Go to last post
  56. summarizing health indicators by facility

    Hi! A bit of background about the current issue: We're looking at a set of 6 indicators (simple binary variables) aggregated at a facility...

    Started by jamesmartinn‎, 11-04-2014 10:19 AM
    • Replies: 0
    • Views: 946
    11-04-2014, 10:19 AM Go to last post
  57. repeated measurements - ANOVA, friedmann's test or kruskal wallis?

    Dear all, I am a junior doctor getting involved in medical statistics, of which my knowledge is very preliminary. The problem I face is the...

    Started by vzavvos‎, 10-29-2014 04:25 PM
    friedman, repeated measurements
    • Replies: 0
    • Views: 1,103
    10-29-2014, 04:25 PM Go to last post
  58. Noob question

    why when modeling do some variables have significant p values yet they are not included in the model ? I was doing a cox regression model and...

    Started by Logician‎, 10-28-2014 06:58 PM
    variables in models
    • Replies: 7
    • Views: 1,679
    10-29-2014, 03:05 PM Go to last post
  59. Post Fisher test or interaction terms to determine if 2 groups are different

    Hi, I split my sample in 2 groups, participants with condition +M and participants without the condition -M. I calculated correlations and beta...

    Started by DataPilgrim‎, 10-23-2014 02:14 PM
    fisher test, groups, interaction terms
    • Replies: 3
    • Views: 2,028
    10-29-2014, 01:31 PM Go to last post
  60. Identical continouous dependant variables vs. unique independent variables?

    Hi guys, I'm having an issue re: the statistical test I should be using in research I am undertaking. Let's say I have a study population of...

    Started by Xami‎, 10-28-2014 11:49 PM
    exposure, land use regression
    • Replies: 2
    • Views: 1,740
    10-29-2014, 08:39 AM Go to last post

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