SPSS (Statistical Package for the Social Sciences) is a proprietary cross-platform general-purpose statistical software package.

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Is weighing cases allowed/necessary for the Kruskal-Wallis and its post-hoc tests?

I have a dataset where I have respondents from 3 different countries (USA, NL & DE) and use the Kruskal-Wallis to determine if there are any statistically significant differences regarding ...
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185 views

chi square for trend - SPSS

I have followed fourth-year university students for ten years, recording their attitudes to a particular lecture. The outcome is binary (good-bad). I have 10 rows and 2 columns, meaning year and ...
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37 views

How to find a correlation with only two observations?

I did an A/B test and I have the data for the likeability of two ads and their click-through rates: Ad 1 Likeability = 2.5 Ad 1 Click-through rate = 0,015 Ad 2 Likeability = 5 Ad 2 Click-through ...
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31 views

Is there moderator or not? Centering and unsignificant b

I am trying to check if the relationship between X and Y is a moderated by M. Here is my model: Y = b0 + b1*X + b2*M + b3*X^2 + b4*X*M + b5*X^2*M where X - independable variable, M - moderator, Y - ...
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10 views

Investigation of X on time 1 has an influence on the change of Y between time 1 and time 2

I would like to investigate if X on time 1 has an influence on the change of Y (= absenteeism) between time 1 and time 2: does X on time 1 increases or decreases Y on time 2 controlled for Y on time ...
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33 views

Pooled results missing from GENLINMIXED multilevel analysis of multiple imputation data

I am running a multilevel analysis with the GENLINMIXED command (Analyze>Mixed Models>Generalized Linear Models) on a set of multiple imputation data. The data file was generated by the Multiple ...
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1answer
291 views

How to combine different questions of questionnaire into a single variable?

I have used a 48 item questionnaire - a Likert scale - with 5 points (strongly agree - strongly disagree). The questionnaire contains 6 categories and each category has 8 questions. 8 items correspond ...
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1answer
202 views

Cronbach's alpha: dependent and independent variables [closed]

When I listen / read manuals on how to measure Cronbach's alpha, none of them mention how to deal with independent and dependent variables ( variables Role in SPSS). Could someone advise if it is ...
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19 views

comparison of Akritas et al's & McKean et al's nonparametric ANCOVA models & script of Akritas' model

I'm currently analysing the results of a pretest-posttest experiment with a categorical independent variable with four levels (three treatment groups and a control group) and a continuous dependent ...
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14 views

How to formulate my design in method section

Before they do the experiment they have to fill in a questionnaire to measure their social motive. My actual experiment is about noise vs. no-noise / reward vs. punishment (within subjects). So it's ...
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41 views

Computing a single regression line with confidence intervals for multiple regression lines

I have multiple regression lines for individual groups (predicted values stored in a data set). I want to compute a single overall quadratic regression fit with confidence intervals for these ...
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1answer
90 views

Principal component analysis / multinomial logistic regression

I'm trying to see how level of scepticism impacts willingness to change diet. To measure sceptism I've used a 7 point likert scale. The study I'm basing my research on used a principal components ...
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1answer
39 views

2 factorial experiment (2 by 3). DV is NOT normally distributed

I just conducted an 2 factorial experiment that has 6 conditions (2 by 3). Specifically, my design is: IV1 = prior positive information (positive in A domain vs. control vs. positive in B domain) IV2 ...
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8 views

prediciting binge drinking by BFI and DMQ-R

I am currently doing my dissertation and am looking at the BFI and DMQ-R as predictors of binge drinking. my binge drinking variable is simply just one question. Each of of my questionnaires and binge ...
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1answer
101 views

Bonferroni Correction p value in SPSS [duplicate]

I have run an analysis on data using SPSS. I have a repeated measures design with 7 conditions. I chose to do pairwise comparisons to see where the effects lie and used the Bonferroni correction. If ...
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7 views

question about the output of Binary regression in SPSS [duplicate]

I am using binary regression modle analysising my data, by SPSS as the picture 1. you see in below, it is the first round result, Then, during the next round, I removed the variables which have no ...
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52 views

Cluster analysis in SPSS

I started learning cluster analysis (using SPSS) and I need some help in a practical problem. Given the following variables: The respondents were asked to indicate the importance of the ...
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50 views

Cox regression in SPSS and 3 way interaction with two categorical and one continuous variable

I'm new to survival analyses and am trying to test a model that has a 3 way interaction between two categorical variables and one continuous variable. I am concerned I am doing something wrong with my ...
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24 views

Calculating Cohen's d when df is Sattethwaite adjusted

Is it inappropriate to convert a t-statistic to Cohen's d if the independent groups have missing data estimated (MLE), and the df is much larger than it would be if you just entered the sample sizes? ...
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21 views

What to do when you have more than one column of dependent variable data?

I ran a 2x2x2 mixed Anova on my data I have only got a significant result for one factor and also a 3-way interaction. Trying to find out where the significance lies in the 3 way interaction at the ...
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86 views

How do I calculate Omega-squared for the Multivariate effect in MANOVA?

I did a one-way MANOVA using SPSS and reported the partial eta-squared for the overall multivariate effect as well as for the follow-up ANOVAs (provided on the SPSS output). The editor wants me to use ...
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17 views

SEM Model - Factor Analysis

I am attempting to build an SEM model for the fulfillment of my post-graduate course. For the model I have attempted to do reliability analysis with Cronbach alpha and the results are depicted below: ...
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50 views

Is the frequency of one observation greater than the frequency of others

Suppose I have 10 bags of M&M's. I count the number of red, blue, green and brown M&M's in each bag. I want to know if there are more red M&M's than other M&M's in the bags and if this ...
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1answer
38 views

Ordinal Logistic Regression Predicted Probabilities

I'm looking for a way to produce a matrix of predicted probabilities on data that went through SPSS's logistic regression test. I only use two ordinal variables with a range of 1-4 and 1-10 ...
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1answer
35 views

Inconsistent Performance of PCA Results from SPSS

I've completed PCA with my dataset (16 variables) and extracted 3 factors. I then created an Excel spreadsheet where I can enter in user provided data and calculate the scores for each of the three ...
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10 views

Two-way ANOVA, not quite right

All my data in independent and a random sample from a population. I have collected data and have one dependent variable and 2 different independent variables: Dependent = Length Independent = ...
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1answer
30 views

What is a paired observation or paired variable?

The question kind of asks itself, can anyone explain what a paired observation or paired variable is in basic terms? My data consist of the number of words learnt in a week for 19 different ...
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25 views

What type of statistical analysis would be best to use?

I'm awful at statistics so could really use some help regarding statistical analysis and which approach to use. Here is what I know - I need to determine, based on stats I have been given, whether ...
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1answer
321 views

In SPSS, should I calculate the mean score or the total sum score?

Are there any differences between mean scores and total sum scores? I know how to calculate both, I just don't know if there is one of them that is preferable? Also, the scores will be used for ...
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10 views

Can linear regression slopes be used as covariates in an univariate ANOVA?

Sorry if this has been asked before but I've searched a lot without luck! The closest thing was the following question, which partly answers my question: Can slopes in linear regressions be used as ...
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37 views

Explaining mixed-model interactions with ANOVA?

I have searched through the answers on this forum and I couldn't find any detailed explanation to my question about linear mixed models. Here is my setup: 4 groups with treatment X (one of which is ...
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26 views

Is the constant value ignorable?

I am running a linear regression on SPSS. Basically I have 2 independent and 1 dependent variables; and I would like to understand which of my independent variable is more effective on the dependent ...
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1answer
90 views

how can i calculate the degree of agreement between two methods

I have a sample of 26 learners and I used two different methods to identify their personalities. My problem is I am not that good in statistics and I want variables that I can use within SPSS to ...
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1answer
131 views

Large value of exp (B) in binary logistic regression SPSS what is wrong? [duplicate]

I had a very large value for Exp(B) in SPSS binary logistic regression. What is wrong and what should I do?
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35 views

Using standard error or standard deviation bars in within-subject design: How should i interpret and report this?

I have gathered results from a study that tests participants reaction time in a task that tests two conditions simultaneously by randomizing the trials within the experiment. I have used a wilcoxon ...
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26 views

Appropriate Test for Statistical Significant Change in Values Over Time [duplicate]

I have four number of values for number of policies within a given field put forward in a given year. I want to find if there is a statistically significant increase or decline in the number of ...
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27 views

What test should i perform in SPSS

I have data from two groups (placebo and supplement A) which I tested regarding happiness ranked from 1-10 (i.e. ordinal data). I have test results for pre test, week 1, week 2, week 3 and week 4. I ...
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30 views

pooling the results from a repeated measures using multiple imputation

How can I pool the results from a multiply imputed repeated measures analysis? SPSS does not the pooling, as it does for other analysis types. From a technical standpoint, it is not at all clear. ...
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1answer
38 views

Which statistical test to use?

I have acquired data with multiple variables that I need to test. My dependent variable, Seed number, is tested between Ecotypes but also between Treatments (hot and cold). I need to see whether Seed ...
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26 views

Multiple Imputation on SPSS number of parameters issue

I have to do several analysis on scores from questionnaires but unfortunately, I have some missing data and I was told that doing multiple imputation to replace them was the best solution. So far I ...
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1answer
77 views

Which test statistic should I use?

I have collected data consisting of radiation dose from 2 different equipment. I have taken 3 readings (reps) on each exposure using both the equipment. The data looks like "at 5 mAs and 55 kVp" ...
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1answer
60 views

ANCOVA or not? Non continuous covariate

I have done an experiment with an independent and dependent variable. I repeated the experiment 5 times. Obviously all the repeats will be different from one another, some of them significantly so. ...
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1answer
40 views

Is it possible to conduct confirmatory factor analysis in SPSS?

I found the factor analysis of SPSS seems to only support EFA, but I am not sure. Is it possible to conduct CFA in SPSS? If not, what statistical tool can be used to conduct CFA? I especially need ...
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3answers
61 views

At what point do significantly different groups start to differ?

I have two groups: a control group (N = 91), and a treatment group (N = 54). I did a t-test in SPSS that suggests that there are significant differences between the two groups in terms of the variable ...
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2answers
52 views

Homogeneity of variance is violated for z-scores but not for raw data?

Is this a normal thing to happen or have I done something wrong in SPSS? I am using a Levene's test.
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19 views

Unsure which tests to use now that my continuous symptom scale has been replaced with its underlying subscales

I've been working with a large data set in SPSS, mostly focused on the symptom scales of one developmental disorder. I have data from two separate time points, a few years apart. So for example I've ...
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76 views

Logistic Regression with Household Fixed Effects, SPSS

I have cross-sectional data on households and individuals for several countries. I am interested in the marginal effect of a particular dichotomous individual variable $D_i$ (dummy denoting whether ...
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1answer
219 views

Confused with SPSS ordinal regression output

I'm a bit (actually, totally) confused with SPSS ordinal regression output. Let say we have dependent variable score=1,2,3,4,5 (higher is better) and one predictor gender=male,female. We run Ordinal ...
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39 views

Mediation analysis with Likert scale mediator

For my master's thesis, I need to conduct a mediation analysis. My independent variable is the condition assigned, with three different conditions: high income, low income and neutral. I coded the IV ...
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42 views

Likert scale and correlation: when respondents are asked whether or not they agree with a statement

I'm having trouble figuring out how to go about applying correlation and/or regression to a set of Likert scale items that are statements that ask the respondents whether they feel two items are ...