1. Announcement:
    Want access to a chatbox?
    Dason ‎(Devorador de queso)
    05-10-2017
    Views:
    2,811
+ Post New Thread
Page 1 of 32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ... LastLast
Threads 1 to 60 of 1891

Forum: Biostatistics

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

  1. Geospatial best fit - Histogram against continous measured data?

    Hi, I have some remote sensing images from which I extracted the pixel values as histogramms: Pixel value respectively classes 1 - 255 ...

    Started by tommyw‎, Today 06:47 PM
    continous variable, histogram comparison
    • Replies: 0
    • Views: 8
    Today, 06:47 PM Go to last post
  2. Post evaluating performance

    Hi all: We've run up against a bit of a difficult scenario and we're looking for input on how to proceed. I will give some background on our data...

    Started by jamesmartinn‎, 11-16-2017 08:41 AM
    • Replies: 4
    • Views: 133
    Today, 07:56 AM Go to last post
  3. Average standard deviation?

    Hi Everyone, Sorry if a similar question has been asked before. I didn't see a thread focused on my particular query. I have a large dataset of...

    Started by peptideguy‎, 11-15-2017 03:04 PM
    • Replies: 1
    • Views: 86
    Today, 02:40 AM Go to last post
  4. 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: 418
    11-18-2017, 07:59 PM Go to last post
  5. Question about meta-analysis

    Hello! I'm new here and I'm not a statistician but I would appreciate your inputs. Is it possible to make a meta-analysis investigating results...

    Started by termsndconditions‎, 11-07-2017 07:24 AM
    • Replies: 8
    • Views: 296
    11-10-2017, 10:33 AM Go to last post
  6. Statistical test for annual crude mortality trend (3 years data=3 data points)

    Help, I have the crude mortality figures for 2015, 2016, 2017 and would like to know if the figure for 2017 is statistically different. The...

    Started by JNelson‎, 11-08-2017 10:05 PM
    crude mortality, trend analysis
    • Replies: 1
    • Views: 110
    11-09-2017, 07:15 AM Go to last post
  7. What statistical test should I use?

    Hello, I am currently working on my thesis proposal and am having to state the proposed methods of my data analysis. I am focusing on two aims: 1)...

    Started by Victoria447‎, 11-06-2017 01:52 AM
    cross sectional, longitudinal, regression analysis, thesis
    • Replies: 1
    • Views: 181
    11-07-2017, 02:42 AM Go to last post
  8. Correlation between Platelet Count and Mean Platelet Volume

    I have attached my statistical analysis in this thread. It is about correlation between platelet count and mean platelet volume. I am conducting a...

    Started by IceFeast‎, 11-02-2017 02:37 AM
    • Replies: 0
    • Views: 175
    11-02-2017, 02:37 AM Go to last post
  9. P-Trend, what does it mean and how being calculated?

    Hello all :) I need your help... I am trying to make analysis based on a similar paper, and I can't understand the statistical method to be...

    Started by Yankel‎, 10-28-2017 12:29 PM
    • Replies: 0
    • Views: 238
    10-28-2017, 12:29 PM Go to last post
  10. [SPSS - Mixed Models] Repeated measurements data from randomised controlled trial

    I am analyzing data from a randomized clinical trial, with 2 intervention groups (placebo and intervention) and repeated measurements over time. I am...

    Started by Flightpete‎, 10-05-2017 11:25 AM
    control for, mixed effects model, randomized control trials, spss
    • Replies: 3
    • Views: 351
    10-22-2017, 05:59 AM Go to last post
  11. Means are not different but significant

    Hi. I have a query, generated from PrediXcan analysis but more related to statistics. I have the two means of predicted expression values for...

    Started by aqas‎, 10-20-2017 08:27 AM
    means difference, pvalues, significant
    • Replies: 1
    • Views: 361
    10-20-2017, 08:35 AM Go to last post
  12. Question Multiple t-tests vs ANOVA with Dunnett's post-hoc test

    Hello, I am bit confused about the use of multiple t-tests vs ANOVA with Dunnett's post-hoc test (on normally distributed data). Let's take the...

    Started by Biochemist‎, 10-14-2017 07:46 AM
    • Replies: 2
    • Views: 310
    10-14-2017, 12:18 PM Go to last post
  13. Retrospective chart review subject selection: case vs. control

    I did retrospective chart review on 240 subjects from my previous institute. THe study was on sedation required for bronchoscopy. The procedure used...

    Started by dr_pritish‎, 10-14-2017 10:37 AM
    chart review
    • Replies: 0
    • Views: 158
    10-14-2017, 10:37 AM Go to last post
  14. RCT: estimation of total sample size knowing only the percentage of occurrence

    Dear all, I was asked to estimate the minimum sample size to set up a RCT comparing a standard dose technique to detect recurrence of disease vs...

    Started by MDaniele‎, 10-12-2017 04:31 AM
    estimate, noninferiority, rct, sample size, trial
    • Replies: 0
    • Views: 142
    10-12-2017, 04:31 AM Go to last post
  15. Triangulating multiple data sources of prescription information

    I am currently working on a retrospective database study assessing the real-world effectiveness of a medication. I am faced with a few challenges. I...

    Started by vpmwar‎, 10-06-2017 11:59 AM
    agreement, cohens's kappa, correlation, triangulation
    • Replies: 0
    • Views: 198
    10-06-2017, 11:59 AM Go to last post
  16. Comparing the effectiveness of an intervention in two groups?

    Hi Everyone, I'm stuck trying to find a way to compare whether or not a given intervention has a greater effect in one group (Kids < 5) than...

    Started by jpgordon‎, 10-03-2017 10:29 PM
    • Replies: 1
    • Views: 178
    10-04-2017, 08:01 AM Go to last post
  17. Looking for a test to find if there is a relationship between 2 groups

    Hi all, I have a data set of two frequencies, one is the frequency of air temperature and the second is the frequency that an activity occurs at...

    Started by spulak‎, 10-02-2017 12:07 PM
    • Replies: 2
    • Views: 185
    10-02-2017, 03:37 PM Go to last post
  18. Block design anova

    I have a question about what the most appropriate anova design is for my data. I am posting here because I cannot seem to get the search function to...

    Started by vanguard605‎, 09-11-2017 03:52 PM
    anova, block design, community ecology
    • Replies: 2
    • Views: 453
    09-29-2017, 08:35 AM Go to last post
  19. Using logistic regression to compute age-adjusted rates

    Dear All, Would anybody please give me a breakdown no how to compute "age-adjusted proportions" based on the logistic regression coefficients? ...

    Started by Raok‎, 09-15-2017 06:53 AM
    • Replies: 4
    • Views: 600
    09-22-2017, 10:02 AM Go to last post
  20. Interpreting significance based on confidence interval

    Hi Everyone, Could some of you help to interpret my results based on p values and confidence intervals? A little bit of background: I am trying to...

    Started by julian_DE‎, 09-21-2017 07:48 AM
    • Replies: 3
    • Views: 348
    09-22-2017, 05:04 AM Go to last post
  21. Repeated measures with varying count between group

    I'll explain my problem a bit: I have two groups S(story) and P(picture). Each is composed of the same 48 subjects. My endpoint is a 'score' on an...

    Started by qjuice‎, 09-18-2017 06:46 PM
    • Replies: 5
    • Views: 458
    09-20-2017, 05:05 PM Go to last post
  22. Switch of distribution during observation period (Scratch Assay)

    Dear Stats-Talkers, I performed several Scratch Assays (its an experiment where cells close a cell-free gap over time, see also attached file I)...

    Started by Peters‎, 09-12-2017 04:00 AM
    • Replies: 0
    • Views: 299
    09-12-2017, 04:00 AM Go to last post
  23. Modeling and predicting pathology from multivariate clinical data

    Hello, I have a clinical data set that consists of 5 clinical measurements on thousands of tissue samples. Furthermore, each sample has a pathology...

    Started by jason.parker‎, 09-09-2017 04:50 PM
    biostats, cancer, prediction
    • Replies: 2
    • Views: 258
    09-11-2017, 09:55 AM Go to last post
  24. what statistical test to choose (large smple size)

    Hi all, I need to perform a test which shows if there is a statistical difference between males and females in getting diagnosis. I believe I should...

    Started by bburugap‎, 09-09-2017 08:34 PM
    • Replies: 2
    • Views: 335
    09-10-2017, 09:48 AM Go to last post
  25. Chi square p value <0.01 but graph pad prompts not valid

    Hello all, i have used graph pad prism to calculate p- value. my contingency table contains some observed frequencies which are 0. my p-value has...

    Started by Tiya‎, 09-09-2017 12:52 PM
    • Replies: 1
    • Views: 224
    09-09-2017, 01:09 PM Go to last post
  26. Poll Poll: Similarity instead of differences in means b/w 2 groups

    Hi - long time lurker. First time poster. I'm hoping folks can provide guidance and opinions. I am looking at a small pilot study (n=16) of...

    Started by drtoddchang‎, 08-28-2017 12:16 AM
    equivalence, heart rate, paired, wilcoxon signed
    • Replies: 4
    • Views: 625
    08-28-2017, 03:33 PM Go to last post
  27. Is Chi-square appropriate for a single measurement variable with repeated measures?

    Hi! I am looking at how many burrows are occupied by a skink species at eight sites across a property. Counts of the number of occupied burrows...

    Started by RustyEcologist‎, 08-22-2017 11:54 PM
    • Replies: 2
    • Views: 388
    08-24-2017, 06:20 PM Go to last post
  28. One way ANOVA vs Kruskal Wallis

    Hi, I am comparing four groups (measurements of bone thickness and other bone parameters). The distributions are normal (Kolmogorov–Smirnov test)...

    Started by n.lu‎, 08-23-2017 05:04 AM
    kruskal wallis, nonparametric, one way anova, parametric
    • Replies: 1
    • Views: 475
    08-23-2017, 08:38 AM Go to last post
  29. Question Can I calculate the % of people positive for an outcome from an odds ratio?

    Hi, Thanks for looking at my question. Background I am doing a systematic reveiw and metanalysis, essentially on diagnostic test accuracy and...

    Started by SSSA‎, 08-18-2017 10:09 AM
    odds ratio
    • Replies: 8
    • Views: 441
    08-21-2017, 02:45 AM Go to last post
  30. Cox Regression with missing values

    Very grateful for any advice. I'm trying to perform Cox regression on a data set with multiple random missing values. SPSS is my go-to software,...

    Started by Rowena‎, 08-13-2017 04:36 AM
    cox regression, missing values, sas, spss
    • Replies: 5
    • Views: 587
    08-17-2017, 05:06 AM Go to last post
  31. Best scenario: unpaired or paired situation?

    I have a few questions, but first let me give you some necessary background of the experiment and the underlying questions. Basically, the design...

    Started by tleal‎, 08-15-2017 11:37 AM
    hypothesis testing, matched, paired, pairing, unpaired
    • Replies: 0
    • Views: 372
    08-15-2017, 11:37 AM Go to last post
  32. Freidman test with missing values?

    I have a set of data at four time points, but some subjects only two out of the four time points. Can I still use Friedman test for this in SPSS?

    Started by zhu‎, 08-15-2017 11:34 AM
    • Replies: 0
    • Views: 207
    08-15-2017, 11:34 AM Go to last post
  33. Propensity Score Matching

    Hi! I'm conducting a retrospective study in which we want to analyze time period of 60 days before occurence of a particular adverse event. To do...

    Started by joanna513‎, 08-09-2017 07:06 AM
    propensity score matching
    • Replies: 1
    • Views: 466
    08-09-2017, 08:56 AM Go to last post
  34. Poisson Standard Deviation

    Hi! Just a sanity check as I have to do a few computations for a report manually. Our indicator is defined in the following way: #...

    Started by jamesmartinn‎, 06-05-2017 10:03 AM
    • Replies: 6
    • Views: 1,082
    08-08-2017, 09:34 PM Go to last post
  35. Normal Approximation, Fisher's Exact Test, Relative Risk or Odds Ratio?

    A clinical trial is being planned, in which the primary outcome is binary (success/failure). There are two treatment groups (treatment/control). The...

    Started by WeeG‎, 06-17-2017 01:06 PM
    • Replies: 7
    • Views: 982
    08-08-2017, 09:33 PM Go to last post
  36. Help with correct statistical analysis?

    I am conducting an audit into vitamin D deficiency in children. I have the mean serum concentrations of vitamin D in specific areas (postcodes)...

    Started by MedStudent‎, 07-03-2017 05:54 PM
    • Replies: 5
    • Views: 831
    08-08-2017, 09:32 PM Go to last post
  37. Statistical significance

    Hi, I have the following problem and I would need some piece of advice to solve it: I have a group of 28 patients (17 survived, 11 died) and I...

    Started by Carcassonne‎, 07-10-2017 02:51 AM
    • Replies: 8
    • Views: 763
    08-08-2017, 09:31 PM Go to last post
  38. Critiquing a Network Meta-analysis: Interpreting inconsistency

    Hi all. I'm a non-statistician trying to critique a network meta-analysis on a group of migraine medications called triptans (PDF link). The...

    Started by networkMA‎, 07-18-2017 02:18 PM
    • Replies: 3
    • Views: 446
    08-08-2017, 09:30 PM Go to last post
  39. Exclamation STATA Logistic Regression Intepretation

    Hi, My dependent variable is goes to college coded 0=No and 1= Yes. I am not sure how STATA reads/ranks the dependent variable....thus I am not...

    Started by I_AM_KB‎, 08-03-2017 02:53 PM
    interpreting odds ratios, logistic regression, stata
    • Replies: 0
    • Views: 407
    08-03-2017, 02:53 PM Go to last post
  40. Sphericity with unequal sample sizes

    Hello, I want to do a repeated measures anova in R on a data set consisting of four treatments on subjects, over 4 weeks. However, in week 3 I am...

    Started by Wouterka‎, 07-30-2017 11:21 AM
    rstudio
    • Replies: 0
    • Views: 403
    07-30-2017, 11:21 AM Go to last post
  41. Question Need Appropriate Test for comparing a series of measurements from one bone to another

    My research involves taking measurements at 9 sections at different locations on the shaft of bones. I am having trouble determining which...

    Started by SierraS‎, 07-13-2017 11:58 PM
    bone, pair, series, test
    • Replies: 2
    • Views: 599
    07-23-2017, 08:41 PM Go to last post
  42. Online Biostatistics Course/Master's Degree

    Hi everyone, I'll be glad if someone could recommend me some online Biostatistics Course or Master's Degree for beginner. Thanks!

    Started by ovallecc‎, 07-20-2017 03:07 AM
    recommendation
    • Replies: 1
    • Views: 680
    07-20-2017, 04:23 AM Go to last post
  43. Patient-year Incidence rates comparisons and p value

    Dear all, I would like to statistically compare two incidence rates from two different groupes. I found the Incidence rate difference (IRD)...

    Started by didye‎, 07-19-2017 04:43 AM
    compare rates, incidence rate, ird
    • Replies: 0
    • Views: 419
    07-19-2017, 04:43 AM Go to last post
  44. Help with comparing disease death rates over time

    Hello everyone, I am working with a national mortality file and have pulled certain deaths for a particular disease and created crude rates by...

    Started by LAM_13‎, 07-17-2017 07:03 PM
    • Replies: 0
    • Views: 1,276
    07-17-2017, 07:03 PM Go to last post
  45. Software for NHANES Analysis

    Hello! I'm going to be using NHANES data for some of my research looking at dietary factors and health-related outcomes. I have a bit of exposure to...

    Started by mam326‎, 07-14-2017 04:25 PM
    nhanes
    • Replies: 0
    • Views: 489
    07-14-2017, 04:25 PM Go to last post
  46. Multi-level Meta-regression using random effect for treatment? [R pkg metafor]

    I am a biostatistician consulting on a meta-analysis of 16 studies each w/ 2 treatment arms. The main interest is in the effect of the variable...

    Started by chelbylu‎, 07-06-2017 03:45 AM
    hierarchical model, meta-regression, r metafor, random effects, treatment
    • Replies: 0
    • Views: 520
    07-06-2017, 03:45 AM Go to last post
  47. Help choosing right statistics

    The experiment consisted of testing the effect of several diets on the weight of fish. I want to check what groups differ from each other. There is...

    Started by Andre Barreto‎, 06-26-2017 02:58 PM
    • Replies: 2
    • Views: 730
    06-26-2017, 04:06 PM Go to last post
  48. sample size calculation for chi square test with more than 2 groups

    Greetings everybody I'm running a sample size estimation for a study that will use chi square test of association for the qualitative comparison of...

    Started by Bassam‎, 06-07-2017 06:23 PM
    • Replies: 4
    • Views: 1,402
    06-08-2017, 10:58 AM Go to last post
  49. test for cumulative analysis of outcomes over time in meta-analysis

    A systematic review and meta-analysis I am reading references having tested for chronological cumulative analysis for the effects of the outcomes...

    Started by Roundtoit‎, 06-02-2017 05:41 PM
    • Replies: 3
    • Views: 1,306
    06-04-2017, 03:02 PM Go to last post
  50. Simple question re retrospective study types

    Hi, Please could someone confirm that I'm using the correct terminology to describe two studies listed below. I think that they are both...

    Started by ConnemaraPony‎, 05-30-2017 01:31 PM
    • Replies: 2
    • Views: 1,735
    05-30-2017, 03:48 PM Go to last post
  51. Non Inferiority with a Historical Control

    Is it possible or valid to do a Non-Inferioirty Test againts a historical control. I should point out for the historical control all I have is a...

    Started by polc1410‎, 05-30-2017 04:09 AM
    • Replies: 1
    • Views: 1,002
    05-30-2017, 08:46 AM Go to last post
  52. Should I perform a PCA on my datas?

    Hi, I'm new to the statistic world. I have doubts about pca. I am performing the statistics of my study and I have a lot of data. I wonder if I can...

    Started by Clarissa‎, 05-26-2017 08:36 AM
    • Replies: 0
    • Views: 1,002
    05-26-2017, 08:36 AM Go to last post
  53. covariate for only clinical group

    HI I have tried to find an answer on the web but was not able, and will appreciate your help! I have a question regarding the use of a covariate in...

    Started by newbeeme‎, 05-21-2017 01:48 AM
    • Replies: 3
    • Views: 1,563
    05-22-2017, 09:28 AM Go to last post
  54. 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...

    Started by julian_DE‎, 05-15-2017 01:06 AM
    • Replies: 3
    • Views: 1,273
    05-15-2017, 08:55 PM Go to last post
  55. Smile Mixed Model Analysis SPSS

    Hello All, I have a data set which I am trying to find out what is the best way to go about analyzing. I have been asking around and was advised...

    Started by quix09‎, 05-15-2017 08:24 AM
    • Replies: 0
    • Views: 1,061
    05-15-2017, 08:24 AM Go to last post
  56. Is Cochran's Q the right test for repeated measures with binary outcomes?

    Hi, I am trying to analyze a data set. The question we are looking at is whether the rate of a successful outcome and the risk of a...

    Started by Jennifer Kosty‎, 05-12-2017 12:15 PM
    • Replies: 0
    • Views: 951
    05-12-2017, 12:15 PM Go to last post
  57. Different proportions in different conditions?

    Hi, I am struggling with the proper way to analyze my data. I did some research in and out of this forum but could not find the answer to my...

    Started by Fanny-‎, 04-11-2017 08:06 AM
    • Replies: 3
    • Views: 2,038
    05-07-2017, 03:06 AM Go to last post
  58. GLM with non-linear predictor

    Hi, I am analyzing a dataset looking at procedural skill development. The data itself is binomial, whether or not a procedure was successful. When...

    Started by amw2320‎, 05-06-2017 11:02 PM
    • Replies: 0
    • Views: 933
    05-06-2017, 11:02 PM Go to last post
  59. 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: 2,088
    05-04-2017, 05:59 PM Go to last post
  60. Post Chi-square goodness of fit test

    Hi all, I'm currently conducting research at a radiology department. The setup of our research is that we let 2 radiologists indicate their...

    Started by MaxTalksStats‎, 05-01-2017 03:29 AM
    • Replies: 1
    • Views: 1,174
    05-01-2017, 04:23 AM Go to last post

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

Thread Display Options

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.

Order threads in...

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

Icon Legend

Contains unread posts
Contains unread posts
Contains no unread posts
Contains no unread posts
More than 15 replies or 300 views
Hot thread with unread posts
More than 15 replies or 300 views
Hot thread with no unread posts
Closed Thread
Thread is closed
Thread Contains a Message Written By You
You have posted in this thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats