unequal sample sizes

  1. L

    Comparing one normal and one skewed group

    Dear Forum, I have 2 groups for which I need to compare the length of stay (LOS) post-op: a control and a treatment group. My control group has the following descriptive stats: (n=66; Mean = 8.42; Median = 6.00; SD = 7.45; Kurtosis = 17.66; Skewness = 3.81), while my treatment group is as...
  2. M

    Comparing distribution of two dependant binary variables different sample size

    Hello everyone, I have been searching for solution for my problem but keeps running into more questions so decided to finally ask for a bit of help. I am working with a dataset in which I want to compare efficiency of two detection techniques. Detection using both techniques are expressed as...
  3. Y

    Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member and I have to say I am not sure if this is the right section for my question (I am working in ecology). I am dealing with unbalanced designs (I am comparing groups with different sample sizes) in PERMANOVA (Permutational Multivariate Analysis of Variance). The...
  4. A

    3-way ANOVA with unequal sample sizes (between-groups)

    Dear smart people, I am currently finishing my Master's in International Business Communication and have run into a problem with my data. I was wondering if you guys could maybe offer me some guidance on how to proceed? For my research, I did the following experiment: In a...
  5. M

    Repeated measurements ANOVA with unequal sample sizes

    Hi all, I have conducted an experiment where the subject is first presented with a set of 7 stimuli. Thereafter, the subject is presented with a set of 5 stimuli. Finally, the set of 7 stimuli is presented again. The set of 7 stimuli is divided into two subgroups A and B with 5 and 2 stimuli...
  6. P

    Unequal sample sizes, unequal variances, help my ANCOVA!

    Hi everyone, I am trying to test to see if there is a difference between the means in two populations. Population A: 100 people, controls Population B: 330 people, anorexic I want to see whether they differ on a measure of body checking (ex: pinching fat). I'm using SPSS...
  7. E

    dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used t-tests adn chi-squared analyses to compare outcomes, and then a multivariate ANOVA with sex and diagnostic outcome (also unequal sample sizes) as fixed...
  8. C

    Adjusting means for different sample sizes

    Hello, I have calculated the mean score for several variables. Because there is a big difference in the number of respondents for each variable it might be misleading to compare the means directly. I am wondering if there is some way to adjust the means to account for the diffeent size of...
  9. M

    Comparing network properties of 2 groups of unequal sizes

    Hi, This may be a basic question. I wish to compare networks of 2 groups: 1st group: Controls. Size 30. 2nd group: Patients. Size: 80. How should I best control for age and gender, for instance, before doing any further analyses? Can I take only 30 patients whose means...
  10. J

    Unequal group sizes and chi square test of independence

    I began working on a project that compares birth outcomes of women in a case management program (n = 270) to the birth outcomes of the general population of delivered mothers in the state (n = 56,001). We were critiqued for testing with chi square for group differences on several birth outcomes...
  11. F

    Kruskal-Wallis & Regression: unequal n, unequal sd & non-normal dep.var.

    Hello and thank you for reading this thread! My problem is as follows: I conducted a simple experiment to check for the effect of gender and gender pairing in the outcome of a game (the ultimatum game, I won't bother you with unnecessary details). Important for my question to you, is...
  12. A

    How do I compare variance and covariance accross groups (MANOVA)?

    Hello everyone, As you'll guess, I'm pretty clueless in statistics, but I do try my best... So I'm doing a MANOVA, my sample sizes are all over the place, normality is violated and obviously Box's test is significant as well, so I read that Tabachnick and Fidell (2007) say that I need to check...