compare groups

  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. A

    One IV, two DVs, across male/female. What could I use?

    I know I've been posting a lot here lately, this is my last one: I have one independent variable (categorical) and want to determine its effect on two separate dependent variables. I know I could use MANOVA for this. But what do I use if I want to determine the effect of an independent variable...
  3. M

    What statistical Test should I use? Anova?

    I have to compare the impact of incentives on an App users (If they avoid using cell phone while driving). The variable is discrete (Number of time they use phone while driving). The first sample is users in Jan-Feb without incentive (smaller in size) and the second sample is users in March with...
  4. S

    Comparing Groups in Ordinal Logistic Regression

    Hi, I seem to have gotten a little confused about the possibility of comparing groups in ordinal logistic regression. Here is my issue: I gave people one of three framing conditions for the goal of a task, which varied in the wording of how the goal was presented. Then I let people perform...
  5. R

    Statistical method to compare urban vs rural matched siblings

    I am writing a study protocol for my masters thesis. The study seeks to compare the rates of Non Communicable Diseases and risk factors and determine the effects of rural to urban migration. Sibling pairs will be identified from a rural area. One of the siblings should have participated in the...
  6. S

    How to extract representative random subsample from large sample?

    Hi! I am new to SPSS and currently looking at data on family firms and non-family firms and their performance - I want to compare the group of family firms (70 firms) with non-family firms (25 000 firms). As you can see, the sample sizes are very different and I want to make them more similar...
  7. R

    comparing simulated and experimental data

    Hi All, I generated a time series data by simulation (each condition has been generated time condition1 condition2 condition3 .... condition50 0 70 70 70 70 20 67.3 69 70 56 30 67...
  8. C

    Appropriate test for two variables

    Hello, This is my first time posting here, so forgive me if I don't include something. I will follow this post and add more information as needed. I want to compare two samples, one is a city, and another is a neighborhood in that city, for the same disease. I have the population size...
  9. M

    Compare groups according to significant differences in mean day spending per person

    Please accept my apologies, the question to follow has probably been posted already a million times. Nevertheless, the whole flood of numbers is somehow overwhelming me and I can't just not figure out which statistical measures are the right ones for my particular research project. :( I...
  10. T

    comparing two sets of data at different time points

    Hi guys, I have a data set that has dates: the first visit, follow up, and the last visit. Each of these has variables within them. Not all participants have the same number of follow up visits. The maximum number of visists is 28, but some participants only have 4 visits, 10, and so on...
  11. E

    How do I split file by gender when using a multiple imputation dataset?

    Hello, I just imputed my data in SPSS using Multiple Imputation. Now I would like to split the data set by gender. The problem is that I am getting an error message that indicates I cannot split the data set by gender without splitting it by the Imputation variable. I tried to split the data...
  12. G

    Statistical technique to compare more than one groups with given constant values

    Hi! I have three samples (S1, S2, S3) to test for nitrogen content and three methods of analysis (M1, M2, M3). I am trying to find out the most accurate method of analysis. The methods will provide with me mean nitrogen content values for different sample. Since the samples are standards, I also...
  13. N

    Need help with comparing regression coefficients between different models

    Hello, I am estimating two multinomial logistic regression models, each with the same dependent variable, but with different main independent variables. Is there a way to determine (perhaps I need to do this by hand) whether the coefficient in my main IV in Model 1 is statistically...
  14. S

    Comparing Likert scales of different lengths

    Hi there talkstats experts. For my thesis I am doing research about listener's attitudes towards 4 different Dutch accents. Next to that I also do research about the lengths of Likert scales. I did 2 surveys with the same questions but one with a likert scale length of 6 and one of 7 answer...
  15. L

    compare questionnaire responses of parents

    Hi all, I have a question with regard to comparing the responses of parents to a questionnaire on the home environment. The questionnaire is a set of approx. 50 questions that are completed by both parents. 12 fathers and 12 mothers completed the questionnaire. I used likert scales for most...
  16. V

    High Mann-Whitney U number good or bad?

    Hello all! I'm quite the newbie with statistics so I'm probably asking stupid questions, but I've been googling now for quite a while without success. I've analysed newspaper stories and one of the variables is how many photographs they contained. I have two distinct paper groups from two...
  17. F

    small sample size

    Hi everyone! Nice to meet people do same things on the web:) Here the question: I have independent two group of patients first group have 10 patients second have 5 patients can I compare their surgical corrections (advancement measured as milimeters) with ManWhitney test? (since the...