All Questions
3,928 questions
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516
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One-way anova data normality assumption
The one-way anova assumptions are:
independent and identically distributed variables (or, less precisely, “independent observations”);
independent and identically distributed variables (or, less ...
- 133
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47
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Analyzing Poisson MLM level 2 residuals for outliers
I am using HLM to analyze school discipline data. My outcome variable here is a count - the number of discipline referrals per student in the academic year - and I'm using binary predictor variables ...
- 428
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answers
80
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Binary logistic regression (SPSS) only predictis one outcome
I'm running a binary logistic regression from 5 predictor variables. The outcome variable is match/no match. Although I've run this for four different groups of data with varying distributions on the ...
- 1
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191
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Obtaining individual factor loadings from a CFA in an experience sampling design
I have these intensive longitudinal data of n = 300 participants with 55 measurement occasions each. I have 12 emotion items (6 positive and 6 negative, both high and low arousal).
I am interested ...
- 81
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1
answer
33
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Spearman correlation
In correlation, suppose for example we hypothesize that the use of simple words in people with dementia increases over time and a correlation test revealed that this was not true: it decreased over ...
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241
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What statistical analysis to use for a diary study?
I was wondering which statistical strategy/technique is best for my research, which is a diary study. I have developed a theoretical framework, a mediated moderation model see figure below. All ...
user204622
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508
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What is the best way to analyse (in SPSS) a matched group design?
I am studying cognition in juvenile sex offenders.
I have two independent groups: juvenile sex offenders and juvenile non-sex offenders. I am matching these groups on 9 variables: age, gender, SES, ...
- 1
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67
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Binary logistic regression after factor reduction in SPSS
I have about 25 variables on a likert scale which I have subjected to factor reduction and arrived at 8 factors on which 20 variables are loading cumulatively. I wanted to use these factors and 3 ...
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818
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Growth Curve Models using lmer() function in R (lme4 package)
I am interested in changes in depression surrounding different life events and if personality traits (level-2 predictors) affect these changes in depression. In a given longitudinal data set, each ...
- 31
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30
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parameter different significantly if I split the data alternatively
Let's say I have linear regression model, and assume $\beta$ is the parameter.
Assume the design matrix $X = (x_0,x_1,x_2,...x_n)$
If I split the data alternatively, like this:
$$
X^{(0)} = (x_0,x_2,...
- 431
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73
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How do I "unpair" two regressors from one another that are from a common subject in a linear mixed-effects model?
I'm building a linear mixed-effects model, and I'm not sure how to best structure my data. I was forced to collapse the response variable for each of the three conditions, so I am not even sure that ...
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66
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what statistics should I use?
I did an experiment by feeding three diets (PK, HG and Control (C)) to an insect species. These three diets were offered on two different substrates (PAM, PDA). And I used two parameters to measure ...
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1
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136
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Not sure which SPSS method to use to evaluate results!
I have two main groups of mice: Control diet and high fat/high sucrose (HF/HS).
Within each group, I have three genotypes.
So for example:
Control group: TG, KO, WT
HF/HS group: TG, KO, WT
I have ...
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1
answer
2k
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How should I model relationships among latent variables
I'm learning statistics with SPSS. I have a test case where I need to analyze using regression linear method, I'm not sure if I can explain clearly so please refer to the picture. My understanding is ...
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22
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Are multi-level models equivalent to running regression on the errors?
I have some data that I would like to model in a hierarchical function (it's a toy problem). In this case its production rates on two production lines, their associated products and how much they make ...
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1k
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SPSS Likert Scale analysis
I have taken a survey of responses for different groups of students. Each question on the survey is in the form of a Likert scale response (1-7) I have decided to collapse this scale into a positive, ...
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1
answer
31
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How to find the relationship between average income and owning a house
I have a sample about the income of 110 households, and I want to see how owning a house is determined by the level of income. Or I want to see the effect of income on school enrollment for boys, ...
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1
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74
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Should I use Mixed effect repeated measures? Is this the right use case?
I have a data set which has independent variables (metrics) at the weekly level. I have one row of independent variables for every week. The dependent variable is measured at the monthly level. I have ...
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184
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Forecasting many stores sales with optimal reconciliation and regression
I am forecasting many stores sales via the optimal reconciliation approach. The problem is that forecasts are not as accurate as I would like.
Edit:
Part of the problem is that a small subset of ...
- 2,051
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1
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143
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Within-subject dataset: Fixed vs. random effects in SPSS
I have two classes of 25 students. At the beginning of the semester, they took a personality test that measured a given variable. Let's call it "competence".
Every week, each student from a ...
- 111
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42
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How to test for significant difference in multilevel data?
I work with a multilevel data set like the one below.
...
- 3
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answers
282
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Nonlinear transformation vs Nonlinear regression
Apologies, if the question has some error since my knowledge of statistics is limited. I am trying to predict DV using 9 IV. Using curve fit option in SPSS, I am finding that 6 of my IV have higher $R^...
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25
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Comparing > 2000 means in SPSS
I have two Variables containing hourly mean temperatures in SPSS. I'd like to compare the means for each hour (not the mean of the variable) for statistically significant differences, but I don't know ...
- 101
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37
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How can I model a binary outcome with four-level predictors?
I have 63,419 level-1 observations and 329 level-2, 138 level-3 and 21 level-4 clusters. Thus,
1) I have an average of only 2.4 level-3 clusters for each level-2 one, and of 6.6 level-4 clusters for ...
- 1,262
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1
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56
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0
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1
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416
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Correlation between a categorical and a continuous (scale) variable [duplicate]
How can I find the correlation between a categorical (dependent) variable and a continuous-scale (independent) variable? Is a Kruskal Wallis test appropriate? I'm a little confused as my independent ...
- 3
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votes
1
answer
15
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How to create chart analogue to Custom Tables with two nominal variables on X-axis?
The variables are
A with values A1 to A4
B with values B1 to B3
C with values C1 and C2
I managed to create a custom table with three nominal variables using the Analyze > Tables > Custom Tables ...
- 101
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0
answers
85
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ANOVA over time but not repeated measures
I have an experiment that was incorrectly designed. I'm trying to see what analysis I should provide, but I'm a little confused.
A brief description of the experiment:
Rats were given one of four ...
- 2,692
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81
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Run one univariate Analysis or separate One-way Anova's?
I am looking at the effect of delivery of feedback, type of feedback and timing of feedback on job performance.
A univariate analysis gives me different significant readings for each variable than ...
- 1
0
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0
answers
399
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Non-parametric Clustering for mixed-type data
Currently I am studying Cluster Analysis where I am going through the TwoStep clustering method found in SPSS (it is a futher developed BIRCH method).
Does anyone know what can be used as an ...
0
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1
answer
76
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Which test should I use to test this hypothesis?
I am bit new to research data analysis and SPSS software.
So I am bit confused if I am doing it in right way.
Survey(with companies)
My company believes that xyz with help in doing abc action 1 ...
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1k
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SPSS: How to get error measurements (RMSE, MAE, MSE etc.) on holdout sample?
I split my data into "estimation" and "holdout" sample, using "Select Cases" (and select only the cases I want to use as the estimation sample). Then, I created a time series using Expert Modeler in ...
- 125
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1
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56
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Not sure what statistical test to run...SPSS
I have a bit of rudimentary question and am very new to SPSS and statistics in general so I apologise in advance if anything I say is unclear or doesn't make sense - I'll try to clarify as much as I ...
- 1
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0
answers
597
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Follow Up Simple 2-Way Interactions
After conducting a 3-Way in-between subjects ANOVA, I see there is a significant interaction among the 3 independent var, XYZ (2 levels). As a follow up, I conducted a simple 2-Way interaction between ...
- 337
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76
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Scalar-on-function regression with random initial time
I was trying to answer this question
Estimating the effect of different histories of exposure, on a scalar response measured at the end of a study
Executive summary if you don't want to read the ...
- 18.4k
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votes
1
answer
34
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Recommendation for model output test
I have shell length data for mussels at 6 different sites (AS, GSF, LM, EM, ES1, LS1). At each site, I ran a model to predict their growth for present day and the next 5 decades, i.e., growth at 2017, ...
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0
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192
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Are there posterior predictive check "point-values" in Bayesian modeling?
One standard for evaluating goodness-of-fit in Bayesian modeling is posterior predictive checks. This means simultaneously visualizing the empirical distribution of the data along with the posterior ...
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1
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124
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Repeated Measures Anova with double execution
I have a similar questions to this one, where I believe the answer has misunderstood the question (although accepted as answer).
Basically what I have is a study, which I am trying to analyze with ...
- 103
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0
answers
48
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Shapiro-Wilk and Kolmogrov-Smirnoff contradict each other [duplicate]
I am testing for normality. I have 5 subjects. I am looking to see the distribution for my baseline data. The normality score that I got for SW and KS contradict each other. SW said m data is normally ...
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0
answers
61
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Measure types in SPSS
What type of measure would a variable containing only means be? Would it be a scalar variable? This variable was created to combine several other variables and make it continuous. These variables were ...
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0
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25
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How to model and measure cross-level interaction among multiple levels of data
I have a weekly data at Brand Level, Sub Segment level and Segment level (the other two are derived from rolling up the Brand level data). The data includes product characteristics, sales, marketing ...
- 101
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1
answer
882
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Comparing top level group effects using a 3-level hierarchical regression
I would like to detect group effects (if any) along with statistical confidences. I have a hierarchical data set structured as follows:
Drug Groups
...
- 101
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0
answers
75
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What Type of ANOVA Design is it?
There are two different type of games (PC and Console), and each game is played on two different screen sizes: 9 inches and 27 inches. 50 subjects are recruited to play the PC game on both screen ...
- 337
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1
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2k
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Interpretation of interaction effect in multiple regression
I was wondering about generally how I should go about and run my multiple regression.
I have two independent variables:
group (binary scored as 0 and 1)
activity (a continuous variable)
If I run a ...
- 309
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0
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397
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ARIMA time trend analysis using R and SPSS and poor datasets: opposite signs for the Moving Average part [duplicate]
I want to study a time series using ARIMA. To understand what is the best ARIMA model, I use the function Arima (dataset, order, seasonal) from the package ...
- 253
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1
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498
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selection of models in hierarchical regression
I have done a hierarchical regression (where the first model have 1 predictor, the second model have 2 predictors and the third model have three predictiors)and just the first model have a significant ...
0
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1
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31
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What test can I run?
I am working on a research question where I am hoping to find a significant difference at multiple frequencies.
I am comparing two age matched groups (n= 217). I am trying to find the correct test to ...
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1
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22
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What kind of test do I use for comparing groups that are themselves groups?
I'm sorry if this question is vague: I don't yet understand stats terminology very well.
Let's say I am interested in a measurement X. Imagine it is neuron diameter. I want to know if brain regions ...
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398
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Categorical Data Analysis (using SPSS)
Searching for behavioral differences between two groups of horses is my main research goal. All the recordings (as I mentioned in the title) are consisted of categorical variables (nominal in most ...
- 33
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310
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Power analysis for serial multiple mediation
Does anyone have suggested methods for running a power analysis for a serial multiple mediation model? I am running the model in SPSS with the PROCESS macro. G*power does not appear to have the ...
