statistical analysis

  1. S

    Trouble with Wilcoxon signed rank test - please help

    Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate Symptom Scores (IPSS) for 10 patients. I am applying the wilcoxon signed rank test - however through all my "googling" there appears to be 2...
  2. A

    How to prove a non negative definite matrix has to be a variance-covariance matrix?

    I know this is a iff condition,and the reverse is easy to prove.But I am having some difficulty to prove that all non negative definite matrices are variance covariance matrix.From what i have collected from wikipedia,I tried to prove it this way. Let A be a non negative definite matrix...
  3. A

    What is the role of relational databases in research design and hypothesis testing?

    I am taking a database management course with a focus on relational databases as part of the requirements of a degree program. One of the course requirements is to apply relational database techniques to a case study. In other words, students have been asked to identify a hypothesis and research...
  4. E

    Statistical Analysis Plan - help!

    I'm doing a summer research project on trends of anxiety and depression. Unfortunately, my preceptor has disappeared in the meantime and I'm left to fend for myself. I've done an extensive literature review, and now have to develop a Statistical Analysis Plan (SAP). While I understand that there...
  5. M

    Regression Hypothesis

    I am not good at statistics that is why I am seeking help in this forum. Thanks for any help in advance. My research hypothesis is Student will score high on optimism, this optimism will be highly correlated with more positive attitude towards fat children, and it will further enhance their...
  6. W

    What does uncorrelatedness and independence imply?

    Dear all, I'm currently reading papers of statistical modelling. I encountered with the concepts of uncorrelatedness and independence. I understand the definitioins, but I am wondering what are the real effects they can make in statistical analysis? For example, I have a dataset and I use...
  7. F

    Advice on comparative analysis between two groups on Likert scale questionnaire

    Hi everyone, I'm stuck on my dissertation which is due next week. I'm a business major student and my project is a comparative research on corporate social responsibility (CSR) between Chinese and German firms. According to my literature review, it's quite obvious that German firms have much...
  8. K

    What are some statistical tests for the relationship between two variables?

    Hi, I posted previously, but I haven't got any response, I assume its more appropriate to post in this forum, that's why I'm posting again. How do I test the relationship between Govt. Spending on Police and the Number of robberies (annually) I have 51 data points. I've done Pearson's, I...
  9. K

    T-test help with determining whether its 1 or 2 tailed?

    Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53 data points (53 years each variable) Firstly, can I use a t-test for this data? My first problem is that I don't get whether I should call this a one...
  10. D

    interactive query computation for statistical analysis

    The decision support is based on the query computations on the existing database. The interactive query is the basic need of end users. The accurate and complete retrieval conditions can help user get the required data from the database. At present, there are two kinds of interactive query...