odds ratio

  1. L

    Ordinal logistic regression - how to calculate odds ratio?

    I am running ordinal logistic regression in SPSS. I would like to calculate odds ratios. What do I need to add to the syntax to obtain odds ratios? Currently my syntax looks like this: PLUM druguse WITH age yrsill BY Any_MH group /CRITERIA = CIN(95) DELTA(0) LCONVERGE(0) MXITER(100) MXSTEP(5)...
  2. W

    Odds Ratio to Probability of Success

    We ran a logistic regression model with Passing the certification exam (0 or 1) as an outcome. We found that one of the strongest predictors is the student's program GPA, the highest the program GPA, the highest the odds of passing the certification exam. Standardized GPA: p-value < .0001, B...
  3. S

    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 particularly on the accuracy of 'tests' alone or in combination. Some studies do not report sensitivity and specificity or the % or no. of people...
  4. L

    Data frame of results

    Hi all Suppose I have 10 different models as such: fit1.glm <- glm(admit ~ gre , data = dat, family = "binomial") fit2.glm <- glm(admit ~ gpa, data = dat, family = "binomial") fit3.glm <- glm(admit ~ rank, data = dat, family = "binomial") ... Suppose then, I want to form a data frame...
  5. L

    Odds ratio plot on log scale

    Greetings, I have had difficulties plotting results from GLM logit models to show up as odds ratios on a log scale. Ultimately I want to obtain estimates from different models and plot the results on one graph as shown here (https://www.ctspedia.org/do/view/CTSpedia/ClinAEGraph001). Do you...
  6. P

    unbalanced design in contingency table analysis. Is it a restriction?

    I conducted a research in to elucidate the biology a of an insect seed predator that infest seeds of a palm specie in cloud forest in Venezuela. I did collected seeds directly from the palm and seeds picked up from the forest floor in two localities. I want to know if differences exists between...
  7. M

    Question on Odds ratio

    Hi, I have a basic understanding of odds ratio. I can't figure out how to integrate the space S into my odds ratio equation. For the following figure: S has 23000 genes, (all genes) A has 751 genes and (condition1) B has 375 genes (condition2) How do I calculate the OR for A ∩...
  8. I

    Population specific odds ratio and subject specific odds ratio

    Hey guys, For a school assignment I have to compute the population specific odds ratio and the subject specific odds ratio from the table below. No GAD GAD Total No MDD 350 (93%) 26 376 (62.7%) MDD 153 71...
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    Multinomial regression: how to interpret results

    Hello Everyone, I'm currently writing my master's dissertation and i'm having two main issues. 1) The first one is related to the attached picture: as you can see, both the variables "deal value" and "N employees" are signicative, but the B and the Exp(B) are zero. This way they are not...
  10. K

    Large odds ratio in binary logistic regression/big scale difference of variables

    I'd like to ask for some help with a binary logistic regression. In SPSS I am building a binary logistic regression with 4 independent continuous variables(Sample size - 85). However, with one of the variables (Bicaudatus_index) I get a huge odds radio: I think that I know where the problem...
  11. C

    Author's interpretation of Odds Ratio and Confidence intervals

    Hi all, Having some difficulty understanding the results of this paper I am including in a review. It compares the effects of 3 interventions aimed at preventing HIV on couple's relationships. A multivariate logistic regression is used and effect estimates are given (which we are told are odds...
  12. J

    Please help interpret cross-sectional study results (odds ratio, relevant risk, etc.)

    I'm trying to help my wife with some statistics. She's looking to see if people with Removable Dentures (RD) have a higher prevalence of Combination Syndrome (CS). She did a cross-sectional study (survey) of 314 patients at her university. Of the 314 patients surveyed, 200 had Removable...
  13. L

    test of logistic regression constant

    Hello, everyone! I wonder whether anyone knows how can i intepret a coefficient of constant in logistic regression. I have used "logistic" in stata, so i got oddsratios. My constant is eqiual .0441026** Please help ! i googled it , but did not find anything.
  14. B

    Interpreting Odds Ratio after Weight of evidence transformation

    I am doing a logistic modeling with several continuous variables and binary outcome variable. 1- event 0-non event. I did the initial modeling with the variables and then did the Weight of evidence(WOE) transformation for all variables except for 1 variable using ratio of Account good/Account...
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    General inverse variance method

    Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know can I combine log OR with the standard OR I have from papers? Or would I need to convert the OR's from papers into log ORs for analysis...
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    percentages or adjusted odds ratio on revman help

    Hi Hi, I'm new to meta-analyses and revman and would really appreciate your help! I have data from an article I wish to add to revman. They have given an adjusted odds ratio, percentages of the event, and the total number of participants in each group. I thought that if I had the...
  17. C

    OR with multiple variables!!

    Hi everyone! I guess this is easy, but I'm not too good in statistics so I need some help!! I'm trying to evaluate a case-control study, where the most common statistical tool is the OR... but now I'm dealing with a multiple variable analysis: This is an example: I'm analysing the...
  18. T

    Random Odds and Percentage Question

    Hi Everyone, I have a random question related to odds and percentage that I can't figure out. Does this statement in terms of the percentage difference sound true? "The odds for students in group A to graduate are 5.03 (11,734 group A students graduate and 2330 do not) and the odds for...
  19. R

    How to compare 2 ORs from different regression models.

    I created a logistic regression model to predict an outcome of depression vs. no depression. There are several variables in the model including gender. I then stratified the population and created 2 logistic regression models (one for women and one for men) because of interactions between gender...
  20. R

    Chi Sqaure and odds ratio help

    Hi all, I was wondering - what's the relationship between chi square and odds ratio? To me it makes sense that these two values are fixed- i.e., if one value changes, the other will. Is it possible to observe the same odds ratio in two different tests with different sample sizes but get a...