medicine

  1. C

    Can you include negative results when doing statistics of antibody titers?

    I need to analyse some antibody titers. Depending on factors they are divided into two (eg. male and female) or more groups. I have to compare the groups. Example: male 1/2 neg neg neg 1/8 female neg 1/4 1/16 1/2 1/4 For the descriptive part, if I got it right, I calculate the prevalence and use...
  2. J

    [SPSS - post hoc analysis and Logistic regression] When the result don't line up

    I'm a medical student doing his research interneship. We're currently investigating if there's a link between motoric and mental outcome and MRI imaging done on neonates. Im wondering if the post-hoc analysis I did in SPSS was the right way to do it. When inserting the data in SPSS, I...
  3. R

    Multivariate regression on nominal data

    I have a database of patient data and I' want to perform a multivariate analysis looking at risk factors for patient length of stay more than 3 days. For example I have: Operation type Operation findings Length of stay > 3 days weight type x finding a...
  4. X

    Application in Medicine: Name Entity Recognition and Relation Extraction

    I am trying to do Name Entity Recognition and relation extraction on clinical text notes. Since this domain is specific, I have couple of questions: For Name Entity Recognition: I have learned http://www.nltk.org/book/ch07.html. It said for NER, we can use classifier function: function...
  5. D

    Is a Cox regression the right test for my question?

    I would like to test if the value of a blood parameter is linked to death (age as a covariate)....example: higher serum creatinine = higher risk to die? I know how to make a cox regression with two groups (e.g.two different medications), but can I also work with a question like described above...
  6. J

    Correlation between radiological sign and clinical symptom: choosing the test

    Greetings, I'm new to the forum and very rusty on statistics. I'm studying to learn enough autonomy, but I really can use some of your kind help :) A group of patients (age known for each) are referred to the radiologists because of hip pain. The clinician suspects X. The radiologist finds...
  7. C

    Minimum sample size

    Hi Everyone, I have spent hours on this and cannot seem to get to the answer. Here is the questions: Calculate the minimum number of children that will be needed in the study to allow paired and unpaired analysis to be performed based on the the following assumptions. First, it is...