Recent content by WilliamB

  1. W

    Odds ratios and correlations

    Yes, 4 others - BMI (body mass index) - MAT-sf (a self-reported measure of physical function) - EQ5D (health-related quality of life questionnaire) - Biobank memory questionnaire
  2. W

    Odds ratios and correlations

    Therefore, age's OR can be interpreted as, an increase in age has a decrease in odds of having worse physical function, which is contradictive to a negative correlation, indicating as age increases, physical function gets worse
  3. W

    Odds ratios and correlations

    Sorry I typed it wrong: Although there is a negative linear relationship for age and physical function (suggesting as age increases, physical function decreases) However, the Odds Ratio for Age is 0.983 (suggesting that as Age increases, the odds of having WORSE physical functional decreases)
  4. W

    Odds ratios and correlations

    Hi, I am having trouble interpreting some results from SPSS. My DV is physical function and my IV is Age. Although there is a negative linear relationship for age and physical function (suggesting as age increases, physical function decreases) However, the Odds Ratio for Age is 0.983 (suggesting...
  5. W

    ROC Curve

    Hi, when running a ROC curve on SPSS and entering the 'Value of State Variable', is this the value for the variable that we hope to be able to predict? Or the opposite? For example, I have a binary DV: Frail (1) and Healthy (2). If I want to be able to predict Frailty, do I enter 1 or 2 in the...
  6. W

    Correlating variable added to logistic regression changes significant predictors

    Hi, when I added a new correlating variable with my DV to the logistic regression model (which wasn't in itself a significant predictor), it changed one of the previously significant predictors to a non-significant predictor. Is this a limitation of a regression model? Does anyone have a good...
  7. W

    Logistic regression equation for calculating participant risk scores

    Or am I confusing that with a linear regression, when I am trying to do this for a logistic regression? Thanks
  8. W

    Logistic regression equation for calculating participant risk scores

    I'm a little bit stuck as to how I now use this predicted probability / risk score that I have created for all participants and then put them all into a ROC curve? Thanks in advance!
  9. W

    Logistic regression equation for calculating participant risk scores

    Thanks, fed2. So, for example, would this be correct: Predicted logit (risk score) = intercept + (Beta x variable) + (Beta x variable) + (Beta x variable) Then would you do predicted risk score = risk score / (1 + risk score)
  10. W

    Logistic regression equation for calculating participant risk scores

    I was hoping you could help me in how I can generate a participant risk score from the logistic regression equation to calculate a ROC curve? Thanks!
  11. W

    Please help! Am I using the right SPSS statistical test?

    So would this be a more effective title? - What effect do Isometric-Eccentric contractions have on VISA score and jump performance in Patellar Tendinopathy from a 12-week intervention? A Randomised Control Trial. So are you suggesting i conduct the mixed anova? What about one way/within/between...
  12. W

    Please help! Am I using the right SPSS statistical test?

    It is a VISA scale that measures pain and functional ability on a scale out of 100 - it is categorical/ordered-categorical. Please find the attachment below if you wish to see it. I do expect to see superiority after the intervention period at 3 months and continued to 12 months by the training...
  13. W

    Please help! Am I using the right SPSS statistical test?

    Thanks for your reply. So I guess I am confused between my Independant Variables. To clarify, I will not be consucting this study. I am writing a grant proposal as if I were going to perform this study. The dependant variable is an outcome measure, measuring pain and functional ability of...
  14. W

    Please help! Am I using the right SPSS statistical test?

    Hello, I am looking into a study comparing isometric-eccentric contractions vs eccentric contractions for a knee condition. Please advise on a statistical test(s) you think should be used to compare these two IVs against the outcome of the DV? I will be testing the DV at baseline, 3, 6 & 12...