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

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What is a “discriminant function” and how to interpret it?

I want to test a model using discriminant function analysis. My question, as the title states, is very basic: What is a discriminant function? That is, how can I interpret the different discriminant ...
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1answer
185 views

Interpreting multivariate tests in repeated measures

I have a within subjects design with 4 DVs and I ran a repeated measures analysis on SPSS. My DV is a physiological measurement and is not expected to be linear. My multivariate Wilks lambda is ...
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294 views

Cross-correlation significance in SPSS

How do I test the significance of cross-correlation values in SPSS? It seems there is no option for this.
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11 views

Under-forecasting in Regression

I have to do forecasting of sales that is how much sales of a product is going to happen in a particular store. I have time series data for last two years and doing forecasting for 2014. The variables ...
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3answers
923 views

My distribution is normal; Kolmogorov-Smirnov test doesn't agree

I have a problem with the normality of some data I have: I've done a Kolmogorov test which says it isn't normal with p=.0000, I don't understand: the skewness of my distribution =-.497, and the ...
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1answer
165 views

How do I “nest” data in a mixed-effects model? and MANY related questions about mixed effects models!

I treated 80 people with drug X and 80 with drug Y. I presented the drugs to them in groups of 10 (meow groups). The drug was consumed for 15 weeks. They reported the severity of their headaches (from ...
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1answer
31 views

Is there an R equivalent for the SPSS custom Tables feature?

I have used the custom tables feature in SPSS for my job almost every day. I am trying to learn R . How can I recreate the custom tables functionality in R. Is there some specific package that I need ...
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21 views

How to compare two variables with different distributions?

I want to compare 2 independent variables, but the problem is that the first variable is normally distributed, while the second variable is not. What is the appropriate test in this case? Can I use an ...
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3answers
527 views

Unequal sample sizes for two-way repeated measures

I have 3 different treatments with the observations of 6 different repetitions. However, all these different treatments (groups) have different numbers of patients. The first group has 26 patients, ...
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13 views

Descriptive Analysis [on hold]

I have one independent variable pertaining to five questions. I asked these five questions to managers and asked them to give a response on the Likert scale (agree, disagree, etc.). Now I want to ...
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22 views

which test should be used to detect the effect of one variable on another?

I have conducted a research on four independent groups of students; one experimental and one control group at two levels. The design of the study was like a pre-test and post-test. I want to detect ...
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1answer
15 views

Correlations for nominal data

I have a gender variable in my questionnaire, I have done it where 1= Male and 2= Female. I would like to correlate this variable with their answers to compare the difference between male opinions ...
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2answers
266 views

SPSS and Stata output different

I'm Stata-proficient but learning SPSS for my new position. I am using a simple dataset to do very basic regressions and comparing to see if the results are the same. They're not. I'm close, but the ...
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18 views

GEE in SPSS: the case of ever-decreasing QICc values

I've been using GEEs in SPSS 22 to analyze my dissertation data and have discovered an interesting problem: when trying to figure out which subset of model factors have the lowest QICc, and therefore ...
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1answer
699 views

Where are the t-values in my pairwise comparisons?

I have data from a study with three conditions. The independent variable was within-subjects and within-items. I did an F1 and F2 analysis (= twice a repeated measures ANOVA) on the averages, by ...
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2answers
46 views

Correlation and collinearity in regression

I did a correlation analysis for my variables. All of them are associated (the coefficient is above 0). However, there is no collinearity problem in my regression analysis. I do not know how to ...
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1answer
29 views

Mixed model in SPSS with random effect and repeated measures

I am working on analyzing a dataset that involves repeated measures data. The data was previously analyzed by a colleague using custom code written in C++, but I have expanded the dataset and am ...
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1answer
126 views

Balanced repeated measures design

Okay this is my problem: I have 12 participants. Each participant spent 3 nights in my lab doing a reaction time task at four timepoints during the night(12, 1, 2 and 3 oclock), with one week ...
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1answer
155 views

One way Anova Test validation

Let me give you an example to show what i am trying to. Let's say 50 patients started a cure for a disease and it took 2 months. So, I want to compare the first month's tumor sizes to the second ...
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3answers
82 views

In SPSS, how to compare two scatterplots of separate bivariate data to determine if the distributions are similar or not similar?

In SPSS, I have created scatterplots of two continuous variables (X & Y) for two separate groups (G & P). Visual inspection comparing the scatterplots from the two groups suggests that ...
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1answer
68 views

How can I find tendencies in specific cases between two groups?

I'm doing this project where we are investigating whether social networks can influence peoples distinctiveness. Briefly summarized, we have primed a group with a social media and another is the ...
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6 views

Estimation of change and difference in changes for repeated measurements

In an ongoing project concerning life style changes, I can't find the way to study the difference in effects over time between the intervention and the control group. The project is set up as a an ...
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1answer
28 views

correlation between factors

I am new to statistics and SPSS. I have a questionerre having 30 likert scaled questions, and 5 factors each having 5 or 6 questions. I made the reliability analysis and no problem is found. all ...
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2answers
21 views

Missing values in SPSS for Chi-Square Tests

I'm a postgraduate student, doing a accent perception study, this is my first time using SPSS! I'm conducting the above tests on my data, where my participants used Likert scales to analyse the ...
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1answer
32 views

How to Calculate silhouette coefficient in SPSS for clustered data set?

I am having a pre clustered dataset with data and the action cluster identified for it using a custom clustering method. I am looking to calculate silhouette coefficient on this clustered dataset ...
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1answer
30 views

SPSS: Comparing Regression Coefficient for 2 Models

Hope you guys could help me with a question I've been stuck on for a while. I'm currently writing my thesis on how MRT (the railway system in Singapore) accessibility affects prices of public ...
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1answer
193 views

Find out if there is a way to create BMI weight category variable

I am working on a project and have to find a way to break my data into percentiles. The variables that I already have are gender, age in months and BMI. If I am able to calculate the percentile that ...
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6 views

Repeated measurement model for Dichotomous variable in spss?

I have a repeated data in 7 diffrent time and 4 group. my variable is Dichotomous (yes/no). How I can do it with spss? what non-parametric test could I use? I appreciate your answers Leili
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21answers
60k views

Python as a statistics workbench

Lots of people use a main tool like Excel or another spreadsheet, SPSS, Stata, or R for their statistics needs. They might turn to some specific package for very special needs, but a lot of things can ...
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1answer
62 views

More specific test to see where it is significant rather then whether it is significant at all? Degree courses against levels of motivation to study

I've been doing chi-square tests to see whether there is a correlation between e.g. motivation levels when studying and degree course. With chi-square, it only reveals whether there is a significant ...
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6 views

Missing values on clinical scoring system in SPSS

I have a SPSS database with 747 patients with sickness symptoms and lab results as variables. With those symptoms and results I have generate two scoring systems. I sum the scores of all the variables ...
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1answer
17 views

What can I do to if I have a nominal dependent variable and scale independent variables?

Our dependent variable is a nominal variable that asks respondents "would you share this video?" with the responses being either yes or no. The hypotheses we are testing are all relational directional ...
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1answer
30 views

Mahalanobis distance in a hierarchical cluster analysis in SPSS

I am conducting a hierarchical cluster analysis in SPSS on my database with several neuropsychological and psychiatric variables. In my database, some of my variables (that is: two pairs of variables) ...
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10 views

Sample size for Cluster sample

I'veen asked to claculate a necessary sample size and I tought the best way to reduce costs and time is using cluster samplig protocol but I have few information and I don't have much experience with ...
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1answer
862 views

Comparing groups at different time points within repeated measures study using SPSS

I have done a RCT (randomized control trial) of an intervention (which is of 6 week duration) versus control. The outcome measure (an exercise test) has been tested pre-intervention (Pre), immediately ...
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1answer
313 views

Factor vs. Covariate in SPSS MIXED

I am using the MIXED command in SPSS to run a multilevel model and was wondering what the difference is when using a dummy coded factor either as factor (via the BY command) or as a covariate (via the ...
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32 views

How to do multiple regression with within-subject independent variables using SPSS?

I have two groups of subjects, both undergoing two experimental conditions. During the experimental conditions, the subjects take questionnaires for evaluation of the mood states, and blood pressure ...
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22 views

3 way mixed ANOVA & pairwise comparisons effect size

im in desperate need of some help for my data analysis assignment! I have a 3 way mixed anova- where I have 2 sig main effects, one significant two way interaction and the sig three way ...
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12 views

some suggestions for analyzing two-factor within subject design?

I'm doing a two-factor within-subject design experiment, and the two factors are all categorical variables. factor one has four categories, while factor two has two categories, and is counterbalanced. ...
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1answer
186 views

Post-hoc chi-squared multiple comparison tests using complex samples module in SPSS v. 20

This questions refers to computing cross-tabulations and chi-squared tests of independence through the SPSS complex samples module available in SPSS versions 19 and up. I am able to compute the ...
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0answers
12 views

Error messages when doing regression in SPSS

I need to do a number of regressions in SPSS but keep getting error messages. For example - "There are X cells (i.e., dependent variable levels by combinations of predictor variable values) with ...
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0answers
10 views

Count variable as control variable in regression in SPSS

I'm doing a research on development of audit fees in 2005-2012. I'd like to see if there's a downward or upward trend in them. I have made a count variable of the years (2005=1 2012=8) and now should ...
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21 views

General Linear Model (GLM) with Continuous Variable and Categorical Variable (SPSS)

I would like to perform a GLM with a continuous variable and categorical variable as fixed factors. For e.g. Weight predicted by Height and Gender. From what it seems, the univariate GLM option in ...
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0answers
11 views

Expectation Maximization (EM) Method - All Constructs or One Construct at a time?

I want to ask whether I can run Expectation Maximization (EM) method in SPSS to replace ALL missing values of ALL constructs at one run, or I have to do for each construct separately? Thank you
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1answer
40 views

Factor Analysis in SPSS & CFA in AMOS

I'm currently in the middle of analysing data for a masters dissertation and I'm having a lot of trouble with understanding factor analysis. I've collected data using a questionnaire in which I ...
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2answers
226 views

Correlating time series for 20 regions (SPSS)

I have a question to which I can't find an answer although I spent really awfully lot of time searching. I have time series data for about 20 regions of a country. Each time series covers 20 years. ...
2
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1answer
181 views

Multiple imputation for missing values

I would like to use imputation for replacing missing values in my data set. I have some constraints , for example I dont not want imputed variable x1 be less than ...
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3answers
275 views

Correlation and group difference with unequal sample sizes

My sample is 60 participants. At first, I did not expect to analyze the correlation, but the result is interesting, so I would like to. The 60 participants are 50 people who have good reading skill ...
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2answers
62 views

mediation analysis when mediator is categorical (SPSS)

I want to do a mediation analysis, with the following variables: ...
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1answer
693 views

Mixed linear model with repeated measures in SPSS

I'm trying to run a mixed linear model analysis with SPSS. When I try to run the analysis, SPSS gives the following error message: ...