group comparison

  1. K

    Can I make a comparison among groups which the control group's data was set to be 100%?

    Hello I want to make a comparison between the groups. However, in the control group, all of the data was set to be 100% and the data of the other groups is the proportion compared to the control group. So the data will look like, (just for example) control group: 100%, 100%, 100%, 100%, 100%...
  2. R

    Which statistical tests should be performed?

    Hi, I did experiment to compare the effect
  3. M

    Grouping of variables to conduct t-test

    Hi all, I have asked respondents in a survey to rate 10 different communication channels (e.g. email, phone, face-to-face...) from 'Not important' (1) to 'Very important' (5). Can I now split these 10 channels into two categories (e.g. offline, online), in order to see whether there is a...
  4. C

    Graduate School Help - What test do I run?

    I am working on my independent action research project and need help figuring out what statistical test to use. I am looking at how my students' waste management knowledge and behaviors change pre- and post- survey. Usually, when I have done something like this, I run a paired t-test since...
  5. T

    ANOVA or T-test

    Hi I have two categorical variables as in below example: Region Dim Value PK Dim1 2 PK Dim2 3 PK Dim3 -1 PK Dim4 -4 US Dim1 -0.5 US Dim2 4.3 US Dim3 2.1 US Dim4 2 PK Dim1 5 PK Dim2 -0.4 PK Dim3 -0.3 PK Dim4 0.8 US Dim1 1 US Dim2 2 US Dim3 0.8 US Dim4 1 I want to compare the variables US and PK...
  6. S

    Non-Equivalent Group Statistical Analyses - is ANOVA appropriate?

    Hi there, I have pre/post data on the same tool for two different populations (Group A: Higher needs, Group B: Lower needs) and two different services (Intensive counseling for group A, Brief counseling for group B). Other variables include age, gender and length of service. Would it be...
  7. C

    Variation of Mantel test?

    Hello. I am new to this forum but it looks like it will be a great reference! For my thesis I used Mantel tests to compare non-parametric behavioral data against genetic relatedness data. So, I had behavior rates in a square matrix and compared them against genetic relatedness values in a...
  8. J

    Distinguishing noise (batch variation) from true differences

    Hello, I carried out a screen for 400 different genes. This was done in batches of 20 genes. Each batch includes 2 replicas of an internal control: a gene that works as a negative control. There is batch to batch variation and the differences between the batch means for the parameter being...
  9. S

    Compare four groups of (related???) data -- is a Friedman test ok?

    Hello, During my study of animal behavior, each of my 10 study subjects (all young females) received a number of aggressions from individuals belonging to 4 different age/sex groups (namely, immature males, mature males, immature females, and mature females). My prediction was that young...
  10. K

    Plotting results of regression with interaction terms

    This is tangentially R-related, but mostly about presenting results of a regression including interaction terms. My ultimate objective is to produce a coefficient plot representing differential associations between a set of predictors and responses for two groups. To this point, as an...
  11. W

    Performing comparisons after a cluster analysis

    I have a data set of N subjects, and P variables, with some vars measuring performance on a task, and some measuring subjects' intrinsic characteristic. Each of the performance variables consists of the proportion of correct responses (range 0 to 1.0) to some set of questions. The characteristic...
  12. B

    T-test vs.Anova Help please!

    I've had this data for so long and I just can't figure out how to analyze it. Please help. I have two groups of students; one group mentored at one point in time, one group not mentored. Both groups of students completed the STAI, the State Trait Anxiety Index, measuring anxiety at three points...
  13. A

    Standardizing Similar Groups with Different Internal Variables

    I am on the student government at a college, i feel like there has to be a way to create a scoring system for a organization. For example like lets say org through great events, used all its money, followed all of our guidelines. They get their budget increased by 1.125 the upcoming year. There...
  14. J

    AMOS- group comparison within group

    I have performed an experiment wherein the same people got to rate product 1 and product 2 on several items. These items together form latent constructs. I am modeling a simple model where I estimate the paths between 1 independent latent variable, a mediator (latent) and a dependent (observed)...