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

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Approaches for multivariate nonlinear (but parametric) regression?

I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a growth curve when compared against (this is ...
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34 views

within group agreement, intra-class correlation, one way ANOVA to justify data aggregation

I am working on my research involving aggregating individual data into group data. Predictor: Task conflict (3-item scale) Process conflict (3-item scale) ...
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19 views

Multiple regression in SPSS

I am trying to figure our which statistical analysis is best for my research. I have 6 cont. IVs and 1 cont. DV as well as several extraneous variables. For my main analysis I want to see if any ...
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2answers
58 views

What is the relation between singular correlation matrix and PCA?

Can anyone kindly give me some information about the statement (last sentence) at the end of below definition. What does it mean by "It can be used when a correlation matrix is singular"? This quote ...
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35 views

Needs suggestions and help for my study

My research question is 'to what extent does patient-provider trust impact African American males' compliance to prostate cancer screening recommendation? This is an exploratory study. I have no ...
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20 views

How to determine which variables need to be trimmed in PCA or Factor analysis?

Background: I'm working with log returns for about 400 tech stocks. I want to use PCA to reduce these into principal components (Internet companies, software developers, circuit board manufacturers, ...
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1answer
23 views

SPSS computing pairwise comparisons after repeated measures ANCOVA, standard deviation question

I am reporting standard deviations for pairwise comparisons of adjusted marginal means. SPSS gives me the standard error that I can convert, but I am unsure if SPSS uses the equivalent of N or N-1 to ...
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18 views

Zero-inflated data? Comparing means in SPSS

I whish to know how to compare means with zero-inflated data. I tried to perform an ANOVA test but obviously comparing means it's impossible since some treatments are very rich in zeros. I'm studying ...
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1answer
43 views

Can I do a dependent t-test if pre & post were anonymous?

I am trying to analyze the following case study using SPSS. What I have done so far as part of my research is to conduct a case study to measure the affect the introduction of different technology ...
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10 views

Negative Reliability for Pre Assessment BUT Okay Reliability for Post Assessment

I have gathered data from only 6 participants participating in a program. Before running my analysis, I wanted to check my reliabilities. The 2 item PRE assessment has a negative alpha. However, when ...
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22 views

SPSS ANOVA Can't Find Independent variable (factor)

I want to know if there is significant differences between groups. I have a string variable "Site" which is grouped into 7 (Values 1-"site A"; 2 - "Site B" and so on). The problem is i can't find ...
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90 views

How to report results from a linear mixed model “test of fixed effects” in SPSS?

What is the appropriate way to report results for linear mixed model based on the "test of fixed effects" table in SPSS? Is it just (F=xxx, p=xxx)? This isn't my data but this is an image I found of ...
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9 views

Cronbach's alpha

I want to use the EAT-26 in my study , and the zero frequency is high in scoring because more than one answer represent zero in scoring ( never=0,rarely=0,sometimes=0) , so Cronbach's alpha is low ?! ...
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Measuring positive and negative items in Exploratory Factor Analysis

My research topic is related to motivation regarding product usage and the negative items mainly consist of problems that hinder motivation. My dataset is composed of both positive and negative items ...
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37 views

Kruskal Wallis test, with significant difference in variance

I would like to test my subset with ordinal dependent variable (measure in 1,2,4,8,16...) and ordinal independent dependent variables (0,1,2,3), and i choose the Kruskal Wallis test. However when i ...
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2answers
114 views

How to code open ended questions

I have some open-ended questions on a survey which i designed using survey monkey and had exported the responses from survey monkey directly to spss which means that the responses to the short answer ...
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1answer
33 views

Is Chi-square the right test to use when comparing multiple proportions

In my analysis, I have 4 groups: FLU-P (symptoms with virus) FLU-N (symptoms without virus) HCY-P (healthy with virus) HCY-N (healthy without virus) I am looking at the level of antibody ...
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20 views

Non Probability Analysis

I want to quantify the results of my non-probability survey. Are there any analysis techniques I can use that don't require or assume randomness other than descriptive?
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35 views

For a conjoint analysis in SPSS, I have 16 cards, but some combinations are unrealistic. Do I still include them in my survey and analysis?

I ran an orthogonal design for my conjoint plan and ended up with 16 cards to test. However, not all combinations make sense in the real world. I'm afraid that if I exclude the cards that are ...
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41 views

Significant Friedman's test vs. non-significant multiple comparisons

I am currently running a randomized, placebo-controlled, cross-over design for a new type of intervention. This intervention is compared to a placebo and another more conventional type of treatment. ...
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37 views

Analysis for a repeated measures design with covariate that varies over conditions?

I'm trying to find the correct analysis that will allow me to carry out the equivalent of a repeated measures MANCOVA with a covariate that varies over three conditions. Basically I have an experiment ...
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2answers
95 views

Mixed Model Type-III Sums of Squares- R vs SPSS

The age old question of comparing sums of squares (SS) between programs has reared its ugly head again. I am trying to replicate output in SPSS, that was computed using Type 3 Sums of Squares, in R. ...
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61 views

Using results of Canonical Discriminant Analysis to get overall variable importance?

I have a dataset with thousands of observations pre-assigned to 18 groups and with measures for 8 different variables. I am using canonical discriminant analysis to see how separable my 18 groups are. ...
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9 views

Interrater relibility in SPSS - how to type in data?

I have 20 participants I rated. I rated them on 10 variables (body language,talk, looks, etc) Now a second rater will rate 10-15 of those participants as well, on the same 10 variables... Is Kappa ...
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1answer
24 views

Logistic regression: Overall significance of categorical predictor in SPSS

In SPSS, when performing binary logistic regression using multiple categorical predictors, a significance level is detailed for the variable overall in addition to each category. This strikes me as ...
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42 views

SPSS ANOVA or MANOVA or huh?

Me again asking the silly questions - this might belong here as I've been told it may belong in a software section somewhere..? Which I have still been unable to find. Here is a screenshot of my ...
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125 views

SPSS - making percentage variables

I need to transform a fairly large data set in order to analyse a certain variable as a percentage. I have seconds that I want to convert to their percentage value but by grouping variables. ie. ...
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40 views

How to compare diagnostic accuracy of two tests in unpaired data?

I am wondering whether I can compare diagnostic accuracy, sensitivity, specificity, positive and negative predictive values, and likelihood ratios, between two diagnostic procedures employed in two ...
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26 views

CHAID tree analysis in SPSS

I am trying to build a decision tree using CHAID in SPSS. I am however getting only one node. I have tried taking several data inputs. I also tried out CRT. Is there some setting that needs to be done ...
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20 views

How to identify items answered differently by some factors such as male vs. female?

I want to do something like this: Variable: students (undergraduate, master students, and PhD students) Research instrument: XXXX (20 items) Reporting: The ANOVA analysis suggested that there is no ...
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14 views

When do I use full factorial and when do I use custom when running a repeated measures GLM?

I plan to run a 3-way mixed MANCOVA in SPSS 20. It is a repeated measures study design with... 3 DVs that each subject reported on 10 consecutive days (within subjects variable) and 3 categorical IVs ...
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29 views

Calculate 'order effect'

My experiment has the following setup: Participant completes exercise A. Participant completes exercise B. A counterbalancing design was used to remove (reduce?) the effect of order on the results; ...
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1answer
63 views

Using ANCOVA when the covariate is not normally distributed

I have conducted a repeated-measures ANOVA, but a reviewer suspects that the observed main effect of condition are due to a the difference between hit rates of two conditions (one of them is ...
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86 views

Multiple Hierarchical Regression - Procedure with mediation

I have a set of hypothesis that I am looking to test. The model is as follows: http://i.imgur.com/pdGRiyw.jpg (simplified to X -> M -> Y) ie. I am looking for direct effects from X -> Y, X -> M, M ...
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35 views

How to measure order effects in SPSS?

I need to measure the order effects for my data. I have four questionnaires that were counterbalanced, which lead to 4 different orders. However, for one questionnaire, there are two subscales, ...
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15 views

How to include replicates in linear mixed models in SPSS?

In my study I had 11 radiocollared hares which i gave 3 different treatments. one treatment was the release of stressed hare sounds in combi with red fox sounds, the second treatment was sheepsound ...
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Which type of test is better to compare difference of one independent variable (3 groups and one control) on a repeated measures experiment?

I have a group of 100 classroom participants, all who have taken a course that included four different lessons (from a single unit). Three lessons were taught each using a different form of ...
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20 views

How to get covariance matrix of the coefficient estimates of compound regression model in SPSS

AFter running regression model in SPSS, I get the compound model: ln(diamter)=1.126*height +3.102. I would like to have the covariance matrix of the coefficient estimates of this model and get the ...
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21 views

Recode Binary to scale Variables

I'm looking to find information to recode a set of dichotomous response variables to preferable a 1-5 scale. I have several response variables which when combined with PCA clearly depict certain ...
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45 views

Running 2x2x2 ANCOVA in SPSS

I need to conduct an ANCOVA on my data. While I've taken a number of statistics courses, I have never come across ANCOVAs and I want to get some feedback on the correct way to conduct this analysis. ...
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16 views

SPSS regression discrete number of outcomes

Patients were asked whether they experienced 6 different health consequences following a procedure. As well as looking at the predictors for each individual health consequence, I am also interested in ...
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1answer
150 views

Logistic regression shows a significant predictor, but a simpler model makes the same prediction

I am currently puzzled by the classification table SPSS produces for logistic regressions (procedure LOGISTIC REGRESSION). I used the block function for that ...
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1answer
267 views

Displaying Ordinal Data - Means, Medians, and Mean Ranks

Thanks in advance for any help. I have some ordinal data that is not normally distributed, so I decided to do non-parametric testing using the Mann-Whitney U Test. I am looking at differences ...
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131 views
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51 views

Which statistical test within SPSS for a crossover study?

I am trying to analyse data from a simple crossover study looking for differences in fat and carbohydrate oxidation and muscle glycogen depletion in 10 athletes fed either sucrose or glucose during a ...
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67 views

Repeated measures ordinal data analysis SPSS

I'm looking to run an analysis using ordinal data with a repeated measures design, and could do with some advice on how to do so. I'm looking at whether or not extra curricular activity changes after ...
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162 views

Combining variables in SPSS, if multiple regression is appropriate for likert scale

Im looking into how different types of coping strategies moderates the relationship between working and suffering parental stress. In total I have 5 hypotheses, of how the variables correlate with ...
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35 views

Wilcoxon Signed- Rank Test vs Kruskal Wallis vs One Way Anova? Which one to use

I am conducting research to rank the importance of certain elements within a property management framework. Would like to know which test is best to help me rank the items. The methodology is as ...
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89 views

SPSS chi-square output interpretation

Sorry for the dumb question, I need some help with the interpretation of the spss chi-square test outcome. Basically I have two variables: the first one is a binary variable which takes value 1 if a ...
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73 views

Dummy variables in multiple linear regression with SPSS

1) Is effect coding (as opposed to dummy coding) necessary/possible in logistic regression (as opposed to linear regression)? I think the answer to this is 'no' but I would be grateful for your ...