statistical

  1. G

    Choosing the Statistical Test (if exists)

    Hi! I'm new here and I need help with this: The data: I have 1000+ subjects each one scanned with a MR 3 times (with different sequence T1, T2 and IR). Each scan yields (after a segmentation) to the 15 volumes of the brain region in study (the brain region has 15 "sections" which volumes' are...
  2. J

    tests of agreement between diagnostic tests

    I need to assess agreement between to variables. The problem is that one of the variable is a continuous variable and the other is a categorical variable. I create a test that gives a certain value to a the compression of the brain. The gold standard test gives a categorical value among...
  3. S

    Temporal synchronicities

    Hi, My cat died five days ago. The day after, when we buried him, I happened to look at my mobile phone at 17.17, 19.19, 21.21. On Tuesday I looked at it at 10.10, 14.14, 15.10, 16.10, 17.17, 20.20, 21.21, 22.22, and yesterday I looked at it at 11.11. I have looked at my phone a few more...
  4. S

    plot type 'line' will be truncated to first character

    For anyone that can help me this would be greatly appreciated. I have to determine the probability of a Markov chain hittng state 1 before hitting state 5, with z varying from 0 to 1 and produce a plot. The code I have so far is: trials = 1000; hitone=0; for (k in 1:20){ z= 0 + k/20 for(j in...
  5. T

    Effect of Color on Taste - Statistical Significance

    Hi, for my 8th grade science fair project, I am testing to see if color affects one’s perception of taste. Specifically, I tricked test subjects into thinking that they were tasting different manufacturers’ chips and telling me which one tasted best, but in reality all the chips were the same...
  6. C

    Which statistical test to use for significance (p-value)?

    Hi, I am trying to find significance in a study I conducted. There are 3 groups (so 3 columns on MS Excel) and I am testing significance between them. I am testing for significance between male and female (so I inputted 0 = male, 1 = female). How do I test for significance? I use statistical...
  7. C

    how to determine what test to use for a project?

    I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco regulations went in to affect. I got the crude and adjusted rates with the 95% Confidence Intervals. Can I just use the 95%CIs to show statistical...
  8. G

    developing a statistical prediction rule for success

    Hi, My boss is looking for me to analyze data that we have an past projects and develop a "formula" that will tell how likely a future project is to be a success. We have defined what a success is, so looking at the past data I can find statistics on when projects are successful. Now comes...