Questions tagged [spss]

IBM SPSS Statistics is a statistical software package. Use this tag for any on-topic question that (a) involves SPSS either as a critical part of the question or expected answer and (b) is not just about how to use SPSS.

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15 views

Quantifying Similarity of Survey Responses

I have 6 survey responses with Likert scale questions and some basic demographic information. The 6 responses are pulled from the same group. They all met my selection criteria (School principals ...
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1answer
22 views

Random slopes in a growth curve analysis

I want to test whether an intervention affects a continuous outcome over 5 possible time points. How do I decide whether to include random slopes? I want slope to be able to vary between intervention ...
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11 views

Can you change SPSS time format to millisecond precision hh:mm:ss.sss (3 decimals instead of 2)? [closed]

I want SPSS to display my time as it is originally in a format with milliseconds precision (3 decimals after seconds): hh:mm:ss.sss, but I only see that SPSS only ...
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1answer
60 views

Hayes's PROCESS Multicategorical IV

I conduct an experimental research which contains 8 conditions (8 different types of fruits, 1=apple, 2=orange, 3=watermelon, 4=banana, 5=strawberry, 6=lemon, 7=pineapple, 8=grape) and use SPSS ...
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Which tests should i do with a control group and a experimental group with pretest-posttest design ( 2 levels)

I have an experimental design with a Control Group and a Experimental Group, i have one pretest and one posttest ( 2 levels i think i´ts called) for 5 different variables. Which tests should i run on ...
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18 views

How can I determine if outcome variables depend on two input variables in SPSS?

Using SPSS, I'm trying to determine if values for two independent variables (distance, tide) affect outcome concentrations of 5 compounds (dependent variables), which are listed below. Is there a ...
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1answer
33 views

Binary logistic regression model shows unrealistic OR and 95% CI

I've just done a multivariate regression analysis, using a p-value from bivariate regression analyses of <0.20 as a cut-off to determine which variables will be included in the multivariate model. ...
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30 views

Which analysis should I use on spss

There are 20 participants. Each participant is subjected to 4 conditions and each condition is repeated 9 times. Each condition yields 2 outcomes. I’m not 100% sure which analysis would be best used ...
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20 views

Which design one-way ANOVA or 2-way ANOVA using SPSS?

I have 2 drugs A & B with different 6 concentrations and for both drugs, at a specific concentration, the result is recorded (3 replicas), so I am confused. I have tried 2-way ...
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24 views

Factor with one item [closed]

I'm preparing a questionnaire consisting of some independent variables predicting my dependent variable. One of my factors is "political interest" and it asks users how much they are ...
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13 views

Calculating Mahalanobis distance using SPSS

I am a doctoral student who is still learning programming and statistics. I am really struggling with a problem and need help from this community help in calculating a new variable using Mahalanobis ...
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1answer
35 views

Different output for logistic regression between R and SPSS: how to get correct probability estimates?

I'm trying to fit a binomial logistic regression model, with the ultimate goal of estimating the chances of success/failure for the predictor variable over the outcome variable. For some reason I get ...
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1answer
34 views

Kruskal-Wallis possible?

Let's assume the group variable is the dependent variable and can have the values [A,B,C,D]. It is nominal. The independent variable is ordinal and can have numbers between 0 and 5. I want to test for ...
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9 views

Regarding stepwise and hierarchical regression (regression model building)

I am currently analysing a dataset and I was wondering if it is wrong to use a stepwise regression (to reduce the number of predictors) followed by a hierarchical regression (add demographics to the ...
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Can/How you run correlations with weighted data (csvplan data file in SPSS)?

I would like to run correlation analysis in SPSS using data from a national dataset that uses stratified random sampling. The dataset came with a csvplan datafile to be used when running weighted data ...
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1answer
62 views

How to detect differences between two repeated measures for not-normally distributed variables, adjusting for a continuous covariate?

I'll explain briefly the experimental set-up. One gruop of subject measured in two conditions: A: with treatment (Instrumented gait analysis with foot orthosis) B: without treatment (Barefoot ...
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1answer
63 views

How to analyze the effects of two treatments on two groups as measured by pre, post, and delayed post tests?

I taught two different classes using two different teaching approaches. Each class was given pre-test, immediate post-test, and delayed post-tests to assess their understanding of the topic. The pre-...
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1answer
59 views

Do my results suggest the assumption of homoscedasticity was violated?

I ran a multiple regression with 16 predictors and did assumption testings. I am not sure if my graph shows homoscedasticity, I googled and the information that I have gathered suggests that my data ...
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2answers
264 views

How to interpret negative values for -2LL, AIC, and BIC?

From a statistical point of view, can -2LL, AIC, and BIC in the table of information criteria from SPSS output be less than zero, ie negative? In this case, how should they be interpreted? Note: These ...
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27 views

Which statistical test to apply?

I'm trying to find out which delivery time is the best to give out instructions, my data consists of 3 conditions (1st, receive instructions at the beginning) (2nd, receive instructions halfway ...
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12 views

Can I do a paired sample t-test if correlation of the variables are exactly -1? [duplicate]

What is the correct way of analyzing the paired choice data? When users choose between option x and y with the following options: I like x more than y or y more than x or equally like them both. Can I ...
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1answer
20 views

which statistical test should i use for my project?

i have conducted an experiment with two conditions (happy and sad) i wanted to see the effects of these conditions on words chosen from three different categories (positive, negative and neutral words)...
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1answer
40 views

Which statistical test should i use? [I have conducted an experiment with two conditions (happy and sad)]

I have conducted an experiment with two conditions (happy and sad) i wanted to see the effects of these conditions on words chosen from three different categories (positive, negative and neutral words)...
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16 views

Examining a logistic regression relationship over time

I want to look at the association between a number of variables from a survey that has been run for a number of waves. What I am testing is whether health factors (self rated health, health scales ...
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30 views

Interpreting output from a SPSS generalized estimating equations analysis

I am trying to interpret the table shown below, which is an output of an SPSS generalized estimating equation calculation to calculate the odds ratio of individuals in groups A (Girls) and B (Boys) to ...
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1answer
56 views

Fisher Exact test - Can't replicate SPSS results in Excel

I've been doing some Fisher Exact tests in SPSS and am trying to do in Excel instead. So i can do automatically for rows of data. But I can't get the Excel results to match the results from SPSS. The ...
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21 views

Repeated Measures ANOVA Tests of Within-Subjects Contrasts

Using the MIXED procedure and a set of repeated measures data of vertical format, I obtained the results of fixed effect estimates and related t-tests for orthogonal polynomial linear and quadratic ...
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22 views

How do I use finite population correction in SPSS?

in our study, we have 80% of Norway's living brain cancer survivors. As we almost have sampled the entire population, we need to make a finite population correction. As this influences standard error, ...
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10 views

Which statistical test should be used to compare the frequency of categorical variables across a period of time?

hope everyone is having a good day. I'm developing an study that evaluates the number of deaths of COVID across a period of time and the risk factor associated with it; Figure 1(example) illustrates ...
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6 views

Doing correlation test on likert-type scales and time measures

I'm looking for a method of doing correlation test on these two measures: Time to first fixation - time measures of finding an web object Likert-type scales of satisfaction of ease to find. It is ...
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1answer
32 views

Reporting non-significant regression analysis?

As a result of attached regression analysis I found non-significant results and I was wondering how to interpret and report this. I am a self-learner and checked Google but unfortunately almost all of ...
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14 views

Is it possible to compare variances of different variables of the same population

I am running a factor analysis of a psychometric tool with three subscales. This metric comes with sex-norming guidelines (i.e. female and male raw scores are converted to T-scores using different ...
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17 views

Doing a temporal cluster analysis for terrorism

I am trying to conduct a temporal cluster analysis on a terrorism dataset, but I've hit a bit of a brick wall regarding the method. The dataset spans between 01-01-2015 and 31-12-2019, and for my 3 ...
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1answer
22 views

SPSS, how do I interpret statistical power for one sample t test and independent samples t test?

I did my one sample t test twice (I have two sample sizes from a survey administered (one was in one language and the other was in another language) and compared the respective means to an established ...
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44 views

R vs spss: ttest in python with different result after bootstrapping

Running paired t-test after bootstrapping results in very different results when using SPSS versus "ttest_rel" function in python. Why is that and which one is correct? I first had 5-fold ...
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1answer
23 views

I need help on choosing the correct t test for my data, I am debating whether to use a one sample, independent samples, or both. Please help?

I have two sample sizes of data from a survey (one has 41 replies and the other 12) and I am comparing the mean results (i.e. mean of the 41 sample size to a mean of 60 and the mean of the 12 sample ...
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9 views

Data analysis with pretest and post test and control group in randomized condition

I have done a research on how stretching affect nurses' frequency of pain in different body regions and its pain score. However, I didn't recognized the intervention group and control group ...
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20 views

Hierarchical Multiple Regression interpretation when ANOVA is non significant but model summary and co-efficient is significant

Good Afternoon, I'd appreciate some help with interpreting my regression output on SPSS and I apologise in advance if I am asking daft questions, I've got myself somewhat confused! I did a ...
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1answer
31 views

Which test should I use to compare a normal distribution sample with skewed distribution sample?

I have two groups : Infection group (n=26) and healthy control group (n=127). The aim is to see if there is a difference in the mean of T cells absolute count* values between the two groups. Ho= the ...
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14 views

Grouping dataset using Principal Component Analysis in SPSS

I have measurement results belong to 100 subjects. The measurements were taken from the four different parts of the faces. I need to group my subjects as normal and overweight individuals based on the ...
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13 views

Mediation analysis logistic regression?

We performed a logistic regression to examine the association between certain risk behavior and a negative health outcome. Both the exposure and outcome are dichotomous. Our hypothesis is the ...
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21 views

How to determine number of boost for calculating Krippendorff’s Alpha?

I'm using the SPSS macro for computing Krippendorff’s Alpha, developed by Andrew F. Hayes & Klaus Krippendorff. One argument needed is the units of bootstrapping, and I did not find formula for ...
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11 views

CATPCA - rotation failed to converge, but still get a Rotated Component Loadings matrix

I am conducting CATPCA using SPSS26 with six factors - after running it, I get a Rotated Component Loadings matrix; however, there is a footnote saying "Rotation failed to converge in 9 ...
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14 views

Trying to decide if I should use discrete or averaged observations in a correlation

new to stats, but have to do some as part of my MSc. with limited background. I'm attempting to compare two sets of data - both of which are expressing information about the same shared item. Here's ...
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2answers
27 views

Why are the survival curves different for the Kaplan Meier method and cox regression for the same categorical variable?

I have 1 categorical variable called group (1 = treatment, 2 = placebo). If I create the survival curves with the Kaplan Meier method in SPSS I see that the survival is better for the treatment group ...
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23 views

Stationary R squared

I am looking for information on the stationary R square value from an ARMA model. Are there any references for it? I haven't been able to find much of anything. How is it calculated? How does it &...
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24 views

Every time I run a statistical test, my n-value is doubled

I just finished collecting data for a small study with a within-subject design looking at caching behaviour and how it can be affected by a bird's surroundings. My study had three experimental ...
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9 views

Which SPSS test to conduct

I am writing my thesis and wondering how to format my conceptual model and which SPSS test to use. I research the impact of hard or soft policies on social assistance beneficiaries. I assume in my ...
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2answers
43 views

Ordinal predictor treated as continuous in multiple linear regression: testing deviation from linearity with SPSS

I am running a multiple linear regression with a continuous DV and a number of independent variables, one of which is ordinal (three-levels). I am trying to follow David J Pasta’s instructions to ...
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15 views

Exclusion of cases for one predictor variable in SPSS?

I am running a multiple regression analysis based on a survey I conducted with teachers. I am planning to use teacher gender as one of my predictor variables. The survey from which my data originate ...

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