compare

  1. C

    Compare Percentages

    I have some survey data and know the number and percentage of "yes" responses. How do I determine if any of the percentage yes regional responses are statistically different from the national yes response percentage. Thank you in anticipation.
  2. P

    Compare two regression models

    Hi all. I have a standard (level-level) regression model and a regression model which has the same independent variables except one of the independent variables are in log form. How could go about comparing the two statistically speaking?
  3. A

    How to Analyze: Comparing two proportions

    Hello, I need advice on how to analyze a simple set of data. For simplicity's sake I'll make up the variables. Question: A store keeps track of the proportion of males vs. females that visit its store every day. On Saturday, the proportion of men and women visiting is 0.5 and 0.5. On...
  4. I

    Choose criterion of comparison two data samples

    I have two data samples representing quality of two algorithms. I need to compare them and decide what algorithm is better. Quality depends of experiment number. i.e. it is progressing through experiments. Please, help to decide what criteria should I use to determine what algorithm is better...
  5. 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...
  6. L

    Help please with a tricky problem: compare one element to a row in a table

    Hi Please help I am stuck with a really tricky problem: Hi I have a really tricky problem. I tried several approaches and so far I got lost. I have a table with one column which contains 9 and 2. This is the second table: > my_crazy_data V1 V2 V3 V4 V5 V6 V7 1 1 a 2.0...
  7. S

    Confidence of Distribution

    Hi all, say I have a known normal distribution, which was created by an experiment. Now, I take another measurement, one only, and assume this is the mean of my new distribution, with similar properties as the known distribution. How can I calculate, how sure I am that this new distribution...
  8. D

    Help analyzing bird migration patterns?

    Hi. I am trying to analyze data I have on bird migration and am stuck on what I need to do. Basically, I have the maximum abundance of birds seen per week for 10 weeks for 4 sites within a location, for 5 different species, and over the course of 5 years. So for one year, the abundance...
  9. G

    probability of finding 2 random DNA fragments matching between genomes

    Hi all, I have a question about probabilty. There are 2 genomes (a long string, composed of 4 letters: A, T, G & C), each 150,000 bases (letters) long. Now, I generate 10,000 random fragments (sub-strings) from each genome, each exactly 20 bases long. What is the probability of finding...
  10. S

    Comparing two ratios - Which test should I use?

    It has been years since I attempted statistics and I would appreciate any form of help. I am looking at data, and I want to see if one rate influences another rate. I want to know if two rates are correlated and significance of that correlation. The data looks similar to something like this...
  11. F

    Ranking Method Comparison

    Hi, I have 15 items that need to be ranked from 1 to 15. I have two methods to do the ranking, method A and method B. Method A is where I have 15 users rank all items on a scale of 1 to 5. (5 Being best). I then take the sum of user ranks for a given item and the highest sum becomes the rank 1...
  12. A

    Comparing probability distributions over discrete random variables

    Hi guys Sorry if the post is not in the right place but I am new here. I am comparing the performance of two monte carlo methods. The results I got are the marginals for the same set of random variables. Lets say for example: First Method Second Method X1 0.62...