1. Announcement:
05-10-2017
Views:
2,836
Page 1 of 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... Last
Threads 1 to 60 of 1891

# Forum: Biostatistics

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

1. ### "As treated" analysis, fixed cohort analysis, and NNH?

I had a few questions in regards to this study: http://www.bmj.com/content/346/bmj.f880.pdf%2Bhtml They conducted an "as treated" analysis and...

• Replies: 0
• Views: 2,747
06-23-2013, 09:50 PM
2. ### "Is there a sig. difference in amount of subunits between 2 groups according to age"

Hello! I think I've said it all in the title. I need to run right statistics to answer my question. I guess I have 2 independent variables (age in...

• Replies: 0
• Views: 1,236
12-03-2013, 11:54 AM
3. ### 2 methods proportional hazard in SPSS

Goodafternoon, (Answers are welcome in English, Dutch and German) I have a question concerning how to test for the proportional hazard assumption,...

• Replies: 0
• Views: 8,418
06-23-2011, 09:19 AM
4. ### 2 roc curves (from a study with 2 biomarkers) in one curve

Hy, I have a problem about solving something in R. It's about 2 roc curves of a 2 biomarkers... and I have to plot it in one curve and calculate the...

• Replies: 3
• Views: 2,521
10-16-2015, 12:45 PM
5. ### 2 x 2 ANOVA vs. Paired t-test

I'm trying to figure out which is more appropriate for a trial. I have two groups in a double-blinded, randomized, placebo-controlled trial. We are...

• Replies: 0
• Views: 4,491
02-09-2011, 12:37 PM
6. ### 2-way ANOVA or not 2-way ANOVA?

Hi, I'm currently doing an experiment assessing the effect that 4 different growth mediums have in 3 different O2 concentrations. There are 6...

• Replies: 1
• Views: 1,322
07-08-2014, 08:51 AM
7. ### 2-way ANOVA-like analysis with binomial RVs?

Hi, I have a biological dataset and I'm trying to see if certain treatments are correlated with significant changes. In each sample, I'm...

• Replies: 0
• Views: 6,549
11-20-2010, 10:52 PM
8. ### 2-way repeated measures ANOVA with 2 many repeated measures

Hi, I am looking a several genes and I have measured a value for several exons of these genes (range: 4 to 87). I am looking at the difference...

• Replies: 0
• Views: 1,762
03-23-2012, 11:12 AM
9. ### 2^4 On-farm trial - only 4 plots per farm -> what design possibilities?

Hello, I have to design an on-farm trial with possibly about 600 farmers involved (setting: Madagascar, so rather illiterate participants). ...

• Replies: 1
• Views: 1,397
08-28-2013, 03:17 AM
10. ### 3 study areas - changes in incidence/prev over time within AND between study areas?

Hi everyone, I just thought it's easiest if I go through my research plan and the aim to put things into context. I've been told one thing by one...

• Replies: 0
• Views: 2,215
06-01-2012, 11:44 PM
11. ### 3-group analysis

Hello, I have little project, and today doubts just brought me down. I have sample of 25 patients, and 3 types of disease (a person can have more...

• Replies: 0
• Views: 3,598
07-26-2010, 01:25 PM
12. ### 3D printing project + small sample size (5). How to analyze questionnaire data?

Hi there, I am currently working on a research project investigating the use of 3D printed patient specific anatomy in pre-operative planning. The...

• Replies: 0
• Views: 1,405
07-24-2014, 04:54 PM
13. ### 4 proportions to compare, each with separate N and 95% CI. use ANOVA or what?

With the above info, what's the correct way to determine whether the proportions differ significantly? I thought I had a lovely formula that used...

• Replies: 1
• Views: 1,255
10-23-2014, 09:42 PM
14. ### ?Pearson ?point-biserial correlatiom coefficient for relationship between variables

Hi, I'm new on this forum, thanks for reading my post! I'm trying to figure out if I've used the best method for determining a relationship between...

• Replies: 0
• Views: 1,264
10-27-2014, 06:08 PM
15. ### A better way to pick up on hidden variables

Hi, I'm trying to determine cattle disease risk through various values, including weight, through a machine learning application. I have the usual...

• Replies: 1
• Views: 1,488
06-12-2013, 12:30 AM
16. ### A cohort clinical trial?! Does it really exist?

I saw a study which meets the criteria for a cohort study (without a control though) but it reads a cohort clinical trial! Can you tell me is it...

• Replies: 1
• Views: 1,796
09-19-2011, 07:48 PM
17. ### A different way of presenting this data

Hi folks, I wonder if you could help me? I'm filling in for someone at work and I'm want to express this data in a simple lay person way,...

• Replies: 0
• Views: 1,555
12-04-2012, 04:40 AM
18. ### A doubt in the terminology of sample size calculation

Hi all, While going through a published article of a clinical trial in cervical cancer, I came across this statement under statistical...

• Replies: 0
• Views: 2,275
03-11-2009, 03:59 AM
19. ### 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...

• Replies: 2
• Views: 1,683
12-19-2014, 05:54 AM
20. ### 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...

• Replies: 10
• Views: 6,731
09-19-2015, 05:02 AM
21. ### a simple question

Hi, As you can tell I am statistically challenged. Suppose x and y are continuous, independent variables that represent traits of the N subjects...

• Replies: 2
• Views: 2,133
08-29-2011, 01:46 PM
22. ### A T test question

This is a question on presenting the result of the effectiveness of weight loss program. There is only one group of subject and two time point ( pre...

• Replies: 4
• Views: 1,862
04-23-2013, 04:45 PM
23. ### A tough question: How can I compare 2 sets of coordinates?

Dear All Please help! I have a set of data for children examined for an eye condition (n=334) All children were examined at 35 weeks of age...

• Replies: 4
• Views: 3,808
11-19-2011, 06:21 AM

I have done frequency analysis using spss and now person is asking CI How to find CI

• Replies: 1
• Views: 1,957
09-15-2011, 03:23 AM
25. ### Absolute values or Log-transformed data

I want to perform a non parametric test (mann-whitney) for my experiments that is briefly quantification of viral load (Real Time Polymerase chain...

• Replies: 3
• Views: 1,281
05-15-2017, 08:55 PM
26. ### accelerated time model with proportional hazards

\$coef Estimate SE lambda 0.004424690 0.005026449 gamma 0.888627728 0.108972639 treatment -0.646997631...

• Replies: 1
• Views: 1,362
05-29-2014, 07:11 PM
27. ### Accounting for demographics when outcome is rates

Hello, I've been reading some public health papers and they account for demographic factors such as age, gender, and race in regression models...

• Replies: 7
• Views: 2,178
06-19-2013, 03:15 PM
28. ### accounting for left-truncation is STATA

Hi, I have yet another question about survival analysis, this time regarding the appropriate code using STATA. I am trying to account for...

• Replies: 0
• Views: 1,587
10-09-2015, 08:49 AM
29. ### 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....

• Replies: 11
• Views: 2,253
02-06-2014, 01:37 PM
30. ### 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...

• Replies: 0
• Views: 1,103
02-01-2014, 06:07 AM

I want to add Area Under the Curve (AUC) from multiple meta analyses. AUC for each Meta analysis is given. How can I add them together?

• Replies: 6
• Views: 4,249
12-23-2016, 08:08 AM
32. ### Adjusted Chi-squared test for clustered binary / categorical data

I'm looking for some assistance in statistical analysis with R (ideally), but also some general stats advice. This follows from a review which...

• Replies: 0
• Views: 3,464
02-17-2013, 10:08 AM

Hi to everybody, does anybody knows how to calculate Adjusted Odds Ratio when I have a Multiple Logistic Regression model? Do you know about...

• Replies: 1
• Views: 7,748
12-30-2008, 05:09 PM
34. ### Adjusted Risk Ratios (proc genmod)

I'm looking at some risk factors associated with infant death comparing different races to a reference group. I calculated crude risk ratios...

• Replies: 2
• Views: 8,519
06-20-2011, 11:39 AM
35. ### Adjusting for clustered observations

Hello, I have collected mortality data and several covariates (data on treatment and vital parameters) from patients in two different hospitals....

• Replies: 5
• Views: 2,489
02-25-2016, 12:17 PM
36. ### Adjusting for repeat-test-exposure bias in diagnostic accuracy studies

I'm conducting a metaanalysis pertaining to diagnostic accuracy of an index test compared to the reference standard, and for my question on this...

• Replies: 0
• Views: 1,690
07-04-2013, 03:50 PM
37. ### ADjusting for variables in regression model

Dear all, I'm comparing two populations of oncologic patients that were treated with two different regimens in two different hospitals, group A of...

• Replies: 6
• Views: 2,462
02-22-2017, 01:56 PM
38. ### Adjustment for confounders for testing equality of variance

Dear all I wonder if there is a method that allows to adjust for confounding variables when testing for the equality of variances. I am comparing...

• Replies: 1
• Views: 1,164
05-14-2015, 05:33 AM
39. ### 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...

• Replies: 2
• Views: 1,905
03-08-2017, 11:07 AM
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...

• Replies: 10
• Views: 2,034
jle
05-17-2015, 09:31 PM
41. ### Adverse drug reaction; multiple drugs, possible event(s) per patient. What analysis?

Hello everyone, I am currently looking for the right method to compare the incidences of a given adverse drug reaction (infection) after the...

• Replies: 0
• Views: 2,316
01-24-2012, 04:25 AM
42. ### Advise on choosing statistical method

Hi. I'm a medicine student and I'm relatively new to statistics. I'm looking at some data and I can not figure out which statistical method I should...

• Replies: 4
• Views: 2,070
11-19-2013, 10:26 AM

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

• Replies: 1
• Views: 1,444
11-06-2014, 04:32 PM
44. ### Age-adjusting survey data to compare weighted estimates from multiple surveys?

Hello, I am looking to compare weighted estimates (counts and proportions) of people with disabilities from the National Health Interview Survey,...

• Replies: 0
• Views: 1,790
09-03-2015, 01:36 PM
45. ### Aggregate trend analysis

Someone I work with said they ran across a paper on a study that contained an analysis which looked at the results of several different outcomes to...

• Replies: 0
• Views: 5,271
10-13-2010, 03:35 PM
46. ### Agreement between raters who record the frequency at which they would choose options

Say I have 5 raters and 6 choices. For each choice, each rater records a frequency from 0 to 100: the percentage of time they would choose that...

• Replies: 0
• Views: 907
12-17-2015, 10:01 AM
47. ### Aic & bic

Hello I have a little question. I have learned that we use AIC and BIC to compare models and to choose the best model to fit our data. I learned...

• Replies: 2
• Views: 2,797
12-30-2012, 01:30 AM
48. ### AIC for multivariate linear regression

I am hoping to use AIC to evaluate multivariate linear regression models including interaction terms. Is this possible? If so, how does one determine...

• Replies: 2
• Views: 4,431
02-18-2013, 08:31 PM
49. ### Allowing for time-dependent covariates in power calculations

Hi all, I'm familiar with how to undertake a power calculation to estimate sample size in an unmatched case-control study. Sample size will be...

• Replies: 0
• Views: 1,796
12-12-2011, 01:12 PM
50. ### alpha in one sided tests

hello all, i have a theoretical question, i have found out that on medical research, when performing a one sided test (instead of the preferable...

• Replies: 5
• Views: 9,626
10-27-2013, 08:22 AM
51. ### Alternative to McNemar's Test

Hello all, I want to run the McNemar's Test for matched binary data, however my sample is small (n=10 pairs), and the normal approximation cannot...

• Replies: 1
• Views: 5,073
07-24-2013, 12:32 PM
52. ### Am I introducing a selection bias in my prognostic biomarker study ?

Hi all, I'd be glad to get the advice from someone who's better than me at biostatistics, especially regarding selection biases in survival...

• Replies: 5
• Views: 1,049
02-24-2016, 09:12 AM

might sound silly but for my research topic I am looking into insulin resistance (IR) and dietary factors. We are measuring IR by the use of...

• Replies: 1
• Views: 1,134
03-27-2017, 10:23 AM

Page 1 of 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.