spss

  1. S

    N changes when weighting cases in SPSS

    Hello! I'm stuck here while analyzing data in SPSS and I could really use some help. I'm weighting cases in my dataset, but when I run any analysis the N in the output has changed from 189 to 176. This puzzles me, each case has a weighted value when I check my dataset. Where do I go wrong? This...
  2. S

    What test to use in SPSS....PLS HELP :((

    Hi, I'm trying to write my dissertation for my 3rd year undergrad project and I am really stuck with the stats :( I carried out an observational study using questionnaires looking at public knowledge of dementia. I specifically want to look at how knowledge of Alzheimer's Disease (AD) and...
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    Which stats test should I use?

    I am using SPSS to analyse data. I would like to know whether there is a correlation between age and having diabetes (categorical - Yes/No). What is the most appropriate test to use for this???
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    Choice of test

    Hi all, I'm currently inputting the results for my dissertation on 'the effects of caffeine ingestion on repeated sprint performance post-fatigue'. My dependent variable is sprint time (7 x 30 m sprints) and my independent variable is the condition (control, caffeine and placebo). I have already...
  5. J

    Proportion Z-score calculator

    Hi! I have a sample (of 30) who’s outcome was measured binomially as either YES/NO. The expected population should have entirely NO answers. I therefore want to calculate if there is a significant difference in the proportions between sample of 23/30 (23-YES, 7-NO) and the expected proportion of...
  6. A

    What stats tests should I be running?

    I have data looking at the number of different prey species and the number of different predator species that visited a waterhole and I'm categorizing by time, so eg. 3-6am : 5 prey, 2 predator 6-9am: 10 prey, 1 predator ect. I've tried doing a 2 way anova, and chi squared test but I dont...
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    Why is there a difference in the confidence intervals calculated by SPSS compared to SAS and Epi-Info 7?

    I writing sample code for colleagues in developing countries who will use it to analyze a multi-stage, cluster-sample survey that measures the prevalence of infection with soil-transmitted intestinal worms. So far, I have used three of the software packages they might use: IBM SPSS Statistics (I...
  8. A

    What Stats should I do?

    I have data looking at the number of different prey species and the number of different predator species that visited a waterhole and I'm categorizing by time, so eg. 3-6am : 5 prey, 2 predator 6-9am: 10 prey, 1 predator ect. I've tried doing a 2 way anova, and chi squared test but I dont...
  9. L

    Ordinal logistic regression - how to calculate odds ratio?

    I am running ordinal logistic regression in SPSS. I would like to calculate odds ratios. What do I need to add to the syntax to obtain odds ratios? Currently my syntax looks like this: PLUM druguse WITH age yrsill BY Any_MH group /CRITERIA = CIN(95) DELTA(0) LCONVERGE(0) MXITER(100) MXSTEP(5)...
  10. M

    One sample or independent samples t-test?

    Hello everyone :) I have a problem with a mark I have received regarding my stats assignment. The data was comparing management scores (scale variable) between countries (nominal variable with 7 categories) One of the tasks was to "Test the null hypothesis that there are no significant...
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    Geisser-Greenhouse Correction Nonsignificant Effect

    I've read several pieces of documentation that say that the Geisser-Greenhouse correction for sphericity always increases the p value. I've noticed in SPSS that if a test is not significant (before any correction), sometimes the Geisser-Greenhouse corrected value is actually less than the...
  12. A

    3 way ANOVA following it up

    This is quite simple question but im more simple :p I have DV and 3 IVs, each 2 levs. Making up example, lets say they are: DV=performance%, IV1=trial type (seeing, hearing) IV2=item type (target, distractor) IV3=confidence (high, low) Subjected to a 2x2x2 RM ANOVA in SPSS and i see no 3 way...
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    Constant not sig. in multiple regression - does it matter?

    I did a hierarchical multiple linear regression in SPSS with three predictor variables. All the variables have high F-values and are highly significant at each step of the model, but the constant is not significant (0.079) in the last step. Should I disregard all the results just because of...
  14. E

    multiple IVs or multiple levels?

    Hello I’m having trouble deciding if experiment has 4 levels or 3 IVs and 2 levels. Any help would be greatly appreciated. I also need help deciding what statistical analysis to use on SPSS so in my exp I used the same group of ppts who all watched a slide show. This slide show was testing...
  15. J

    How do I setup my data for mann whitney?

    Hi, I have difficulties using SPSS for my study, I'm not entirely sure which analysis to make. I'm trying to compare the velocity of sneezes between groups (neuro disorder + non-neuro). e.g. I'm having 15 participants with results ranging from 0.1 to 0.6 and a control group of 15 people with...
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    Error message for weighted kappa

    I am working with ordinal scales for cerebral atrophy (ratings 0 to 4) and vascular burden (ratings 0 to 3) assessed by two raters. I have installed the extension bundle for weighted kappa from SPSS (version 25) but I keep getting the error message "some ratings are less than one this command is...
  17. M

    Problems with GLMM results

    Hi all, I apologize if this is a stupid question, but I'm kinda new to GLMM on SPSS. I'm analyzing non-normal data (hormonal response from primates to different factors) from a 2 year study and I'm having some trouble interpreting my GLMM results. All the results I get give me p=0.000 which I...
  18. A

    Chi-square post-hoc test - Helpless

    I have been looking around on the net looking for the best way to do a post-hoc analysis for multi factor significant chi-square test, with no success. I have a data-set of patients with different disease subtypes (Lung cancer subtype A-H). So my two main variables are - Ethnicity (12 levels) -...
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    Help URGENT deadline!! What data analysis method should I use to test the effect 1 variable has on 3 other variables ?

    Hello, I’ve just joined and am in need of any help that I can get. Basically I wanted to test whether phubbing ( snubbing someone to use your phone) impacts relationship satisfaction, sense of self-worth and respect for your partner. Does anyone know what statistical analyses I would need to...
  20. R

    Generalized method of moments/identification through heteroscedasticity

    Hello to all :) First of all sorry for my poor english. I am sadly not a native english speaker. Right now I am doing an event-study for my thesis. It focuses on the impact of the ECB on the german stock market. I found many different approaches but the approach to use the GMM seems to be...