SPSS (Statistical Package for the Social Sciences) is a proprietary cross-platform general-purpose statistical software package.
5
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3answers
3k views
Difference between generalized linear models & generalized linear mixed models in SPSS
I am wondering what the differences are in SPSS between
analyze-> generalized linear models-> generalized linear models &
...
124
votes
20answers
34k 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 ...
11
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4answers
3k views
Visualizing Likert responses using R or SPSS
I have 82 respondents in 2 groups (43 in Group A and 39 in Group B) that completed a survey of 65 Likert questions each ranging from 1 – 5 (strongly agree - strongly disagree). I therefore have a ...
7
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4answers
2k views
is psych::principal function still PCA when using rotation?
I have tried to reproduce some research (using PCA) from SPSS in R. In my experience, principal() function from package psych ...
4
votes
1answer
3k views
How to perform principal components analysis on binary (Yes/No) data using SPSS?
I have a dataset with a large number of Yes/No responses. Can I use PCA or any other data reduction analyses for this type of data? Please advise how I go about doing this using SPSS.
2
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6answers
397 views
How to assess effect of intervention in one state versus another using annual case fatality rate?
I am a beginner in statistics with just basic knowledge. I have these data: cases, deaths and CFR (Case Fatality Rate-deaths per 100 cases) of a disease for 17 years (1994-2010) from 2 neighbouring ...
2
votes
1answer
65 views
Why is ANOVA interaction no longer significant after including a covariate?
I have initially run a 2x2x2 Anova and found some significant interaction between the independent variables. I then ran a ANCOVA where I added a covariate. I am confused with how to interpret the ...
1
vote
2answers
289 views
What terms should I include in a linear regression model?
Consider the following OLS output. My question is: If you have to define a linear equation from the regression, do you then only include significant variables? If so, the equation according to the ...
17
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4answers
9k views
Fisher's Exact Test in contingency tables larger than 2x2
I was taught to only apply Fisher's Exact Test in contingency tables that were 2x2.
Questions:
1) Did Fisher himself ever envision this test to be used in tables larger than 2x2 (I am aware of the ...
10
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5answers
1k views
Stepwise logistic regression and sampling
I am fitting a stepwise logistic regression on a set of data in SPSS. In the procedure, I am fitting my model to a random subset that is approx. 60% of the total sample, which is about 330 cases.
...
4
votes
2answers
2k views
Checking factor / covariate independence in ANCOVA
One of the ANCOVA assumptions, as I read it here, says that:
Independent variables orthogonal to covariates. In traditional ANCOVA, the independents area assumed to be orthogonal to the factors. If ...
6
votes
5answers
2k views
Better Classification of default in logistic regression
Full Disclosure: This is homework. I've included a link to the dataset ( http://www.bertelsen.ca/R/logistic-regression.sav )
My goal is to maximize the prediction of loan defaulters in this data set. ...
3
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2answers
2k views
Logistic Regression: Classification Tables a la SPSS in R
In SPSS output there is a pretty little classification table available when you perform a logistic regression, is the same possible with R? If so, how?
5
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4answers
3k views
How to perform pooled cross-sectional time series analysis?
For 86 companies and for 103 days, I have collected (i) tweets (variable hbVol) about each company and (ii) pageviews for the corporate wikipedia page (...
3
votes
1answer
1k views
Factor analysis for ordinal variables that have different categories
I have a data set that contains about 40 categorical variables that are taken as independent variables (and believed to be related to some unobservable human resource factors) and 4 categorical ...
3
votes
1answer
6k views
Inter-rater reliability using Intra-class correlation with ratings for multiple objects on multiple properties
Initial Question:
I am trying to calculate inter-rater reliability. Previous researchers in this area have used intraclass correlation. SPSS has options for two-way random, mixed random and one-way ...
2
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2answers
2k views
Egger's test in SPSS
How can I conduct an Egger's test using SPSS17? For each study included in the meta-analysis I know effect size and sample size of patients and controls groups.
3
votes
2answers
340 views
BY and WITH command in mixed model SPSS
I coded a variable as 0/1 (species 1 vs. species 2). I assumed that a dichotomous independent variable can be put in the SPSS mixed model as either a "factor" (two levels) ("by") or, if coded 0/1 also ...
1
vote
1answer
11k views
Working with Likert scales in SPSS
I performed a survey using a Likert 1 to 5 scale (totally agree/agree/neutral/ disagree/totally disagree) on 12 questions which are split into 3 statements which the respondent places a value of ...
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0answers
117 views
Performing regression and correlation in SPSS
I hope you are doing good, This is Khawaja Fawad Latif - Sir, i am enrolled in PhD and currently working on my Rresearch Proposal. Sir i have this one question if you could kindly answer my query i ...
14
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11answers
1k views
Best way to get started with and learn R
I have tried several times to "go it on my own" - but with limited success. I am a casual SPSS user and some SAS experience.
Would appreciate a pointer or two from someone who has similar background ...
14
votes
3answers
5k views
When is R squared negative?
My understanding is that R squared cannot be negative as it is the square of R. However I ran a simple linear regression in SPSS with a single independent variable and a dependent variable. My SPSS ...
6
votes
3answers
3k views
Sidak or Bonferroni?
I am using a generalized linear model in SPSS to look at the differences in average number of caterpillars (non-normal, using Tweedie distribution) on 16 different species of plants.
I want to run ...
4
votes
2answers
2k views
How to test for normality in a 2x2 ANOVA?
Study Design: I showed participants some information about sea-level rise, focusing the information in different ways, both in terms of the time-scale and the magnitude of potential rise. Thus I had a ...
4
votes
3answers
1k views
How to do post-hoc tests with logistic regression?
I looked at whether participants recycled after being subjected to a given message. There were three groups: a Control group, group A, and group B.
Since my dependent measure was dichotomous ...
4
votes
3answers
418 views
“Multiple response” analysis of arrest records
Background:
I'm a junior researcher at an institute dealing with regional issues, particularly involving drug policy. Almost two years ago, one of our senior researchers began collecting arrest data ...
7
votes
2answers
4k views
Understanding repeated measure ANOVA assumptions for correct interpretation of SPSS output
I am investigating whether different reward conditions may affect task performance. I have data from a small study with two groups, each with n=20. I collected data on a task that involved performance ...
4
votes
2answers
1k views
How to correctly treat multiple data points per each subject
I am currently arguing with someoe on how to correctly treat data with multiple measurements for each subject. In this case data was gathered for each subject within a short time for different ...
2
votes
1answer
2k views
Types of inverse transformations
In performing an inverse transformation to correct for skewness/kurtosis in SPSS, it asks me to choose what "type" of inverse transformation and I have no idea what the differences between these ...
2
votes
1answer
3k views
How to do meta-regression analysis with SPSS?
I have done a meta analysis and heterogeneity is too high. I am working with (even/Total) for experimental and control groups to calculate the Odds Ratio. I have done fixed-effect and random-effect ...
0
votes
2answers
610 views
Should I use repeated measures ANOVA? Or which other SPSS test should I use?
I have already sent a question to this forum about this, but as I changed my experiment a bit and I am still confused, I would be really grateful if you helped me!
I conducted an experiment in which ...
5
votes
3answers
891 views
Is 0 a valid value in a Likert scale?
I have carried out my pilot study on language learning motivation using a 6 point Likert scale but from 0 (strongly disagree) to 5 (very much agree). I noticed a colleague in his survey used 1 to 6. ...
4
votes
1answer
2k views
Factor analysis problem — singular covariance matrix?
I'm having trouble performing factor analysis on my dataset.
When I perform the factor analysis in SPSS (default settings), it works fine. Problem is, I need to do it programmatically (in Python). ...
4
votes
3answers
6k views
Can I use multiple regression when I have mixed categorical and continuous predictors?
It looks like you can use coding for one categorical variable, but I have two categorical and one continuous predictor variable. Can i use multiple regression for this in SPSS and if so how?
thanks!
4
votes
2answers
9k views
How to deal with not-binary categorical variables in logistic regression (SPSS)
I have to do a binary logistic regression with a lot of independent variables. Most of them are binary. Few ones are categorical with more than two possible values.
Which is the best way to deal with ...
3
votes
1answer
466 views
How to remove blank string values from my analysis outputs in SPSS?
I'm fairly new to the world of statistical analysis so please excuse me for asking a probable rookie question.
I created a google forms survey and after I got the desired sample size I used the xls ...
3
votes
2answers
1k views
How to compare two time series?
I have collected temperature readings for 4 locations on a beach in Cornwall UK using data loggers. The loggers recorded temperature every 15 mins accurate to .1 of a degree (Celsius). The loggers ...
3
votes
1answer
339 views
How to interpret relatively good -2LL value & Nagelkerke $R ^2$ without any significant IVs
My model's chi square says my 'full' model isn't significantly better than the null model. But my -2LL is 80 (isn't this pretty low?) and my Nagelkerke $R^2$ is .20.
On the other hand, there isn't a ...
3
votes
2answers
1k views
Analyzing Likert scales
The Likert scale I am analyzing has both positive and negative questions, but all the items are answered with 4 - strongly agree, 3 - agree, 2 - disagree and 4 - strongly disagree. For analysis, ...
2
votes
1answer
151 views
Why do coefficients and significance levels change so much in my OLS? Do I need MIXED model instead?
Please consider the following OLS model:
As a rule of thumb, a VIF score of max. 5 is considered acceptable collinearity in most fields. So for the better part I believed this model to be quite ...
2
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2answers
3k views
When to interpret multivariate tests when performing repeated-measures ANCOVA?
Yesterday, I ran a repeated-measures ANCOVA. The purpose was to determine the usability of two computer systems, call them 1 and 2. Each subject completed three (conceptually different) tasks, call ...
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vote
1answer
61 views
Two-way ANOVA, what to do next?
I used a 3x2 between-subject ANOVA to examine the effect of colour (three levels: colourless, light red, and dark red) and odour (odourless or not) on perceived sweetness. The results indicated ...
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vote
2answers
264 views
Which statistical test to use for Likert scale questionaire
I need help on determining what tests to use in SPSS. Let me provide some background on my research:
I am doing a research on system automation of leave management in a company (which is still using ...
1
vote
2answers
2k views
Significant interaction between covariate and factor in SPSS GLM
In testing gender difference on the relationship between variable A and B,
A is the covariate (or independent variable)
B is the dependent variable
Gender is the factor
As I understand it, if ...
1
vote
2answers
819 views
Explanation of “covariate” in general linear model in SPSS
I am completing a project for a client using general linear model (GLM command) in SPSS/PASW (Ver. 17)
Basically, the project is designed to find out if factors such as gender and age affect the ...
1
vote
1answer
287 views
Non-parametric multilevel analysis in SPSS
I have a trial with 8 groups. Each group experienced one of two treatments - four groups got treatment A & 4 got B. Within each group, the dependent variable was measured 4 times.
Unfortunately, ...
1
vote
4answers
2k views
How to edit features of a chart from SPSS in MS Word?
Is there any way to edit a scatterplot created in SPSS/PASW after exporting/copying and pasting it into a Word document.
I am finding that when I copy and paste my graph from SPSS/PASW into Word, the ...
1
vote
1answer
2k views
F-test for Lack-of-Fit in SPSS
Some googling revealed that doing the F-test for Lack-of-Fit in SPSS is not so trivial. It seems one has to “trick” SPSS to do that. See for example this. Can anybody suggest a better source of ...
0
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1answer
73 views
Why does SPSS throw out variables in OLS (and how can I prevent this from happening)?
My dataset consists of 4,000 companies from 24 countries. Each company has certain features, the IV's. Consider the variable list below: green is the DV, red the IV's and blue are dummies (one for ...
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0answers
758 views
How do I conduct model selection for logistic regression in SPSS?
I am analyzing a set of clinical data where I try to predict an outcome by using certain covariates. I have already done univariate analysis and now am progressing to binary logistic regression, ...
