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Questions tagged [variable]

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0
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1answer
10 views

Can I create a composite variable for my two dependent variables?

I am working with two dependent variables that are both measuring a country's level of nuclear security. The first variable is a country's nuclear security index rating (range 1-100). The second ...
6
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1answer
27 views

How to deal with variables that are only relevant for some people?

I am reviewing an article. I can't be specific, but it involves validating a test for a health condition. Their goal is to come up with a score for risk of the condition. One variable is pregnancy. ...
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0answers
4 views

Adding probabilistic suffix trees

In the context of Variable Length Markov Chains, I am interested in fitting VLMCs to longitudinal measurements of a set of patients without pruning and then add the trees together. Then, I could prune ...
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0answers
12 views

How does k-fold cross validation select variables?

I am trying to create a model and then validate it. I have 130 observations, with 10 variables. I am sure many of the variables are not needed. When i do a stepwise lm in r (AIC), it ends up ...
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0answers
6 views

Regression/ classifcation model with Ordinal Outcome types and uses

Can somebody explain me the different types of models for the train function from the caret package in R under the heading "ordinal outcomes"? Specifically, "Adjacent Categories Probability Model for ...
0
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1answer
19 views

Estimation of model with non linear dependent variable

I am trying to verify whether two variables are linked by a relation of the type: |y|=ax or y^2=ax. What could be the right statistical procedure to verify whether the above relations are correct and ...
1
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1answer
23 views

In the summary of output of the regression analysis in R, is there a way to display categorical variable with just one coefficient [closed]

I am doing a linear regression analysis in R with logarithmic dependent variable. One of the control variables is categorical and describes an industry. There are 6 industries and thereby R ...
0
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0answers
11 views

Difference of Rates in ECM

I am setting up a model to predict something using Error Correction Model (see pic. to get a general view about the model itself). Some of my $X$ variables are the interest spread between the A and B ...
1
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1answer
30 views

Create composite variables using items with different scales- dealing with multicollinearity

I have IV's that are highly correlated with one another. The first set of correlated IV's, I combined them by adding the score and dividing by 2 to create a composite score. This was simple because ...
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0answers
14 views

What is a variable selection and especially a “model-free” variable selection

First, I just want to make sure that I understand model selection properly: Model selection is a procedure on which, given a collection of models (=hypotheses), we select one which is "best" (by some ...
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0answers
27 views

Calculating value of a variable from correlated variables [closed]

I have 4 different variables (3 known and 1 unknown) correlated among each other. Y,Z,W are the known variables and X is the unknown variable. I have calculated the correlation coefficients of ...
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0answers
39 views

Interpreting units for random forest variable importance

I've trained a random forest for classification in R's caret package using the ranger method and impurity for measuring variable ...
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0answers
5 views

What model should I use if I want to describe the relationship between the % and binary outcome

I want to model a relationship between the % of students who received a flu vaccine at a certain school and whether their school had a flu outbreak or not. Thanks
0
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0answers
26 views

Statistical Test According to Independent Variables

I wish to test a statistical significance between means of data groups. The groups are determined by a continuous variable, however this continuous variable is applied to different test subjects (...
0
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0answers
40 views

What type of variable is this?

The dependent variable takes values [0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10] Strongly disagree is coded as 0 Strongly agree is coded as 10 This is like some kind of adapted Likert scale? SPSS lists this ...
0
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1answer
36 views

Dummy Variable, Reference Group

My job is to create a dummy variable so that those who voted for the Labour Party are compared to a single reference group that includes all other voters. 1 = Conservative, 2 = Labour, 3 = Liberal ...
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0answers
11 views

how to quantify the patterns of multivariate distribution (e.g. clustered in the center vs. spread out all over the place)?

I am wondering if there exists a well-established way to quantify such patterns (please see the graph)? I guess there should be multiple ways to quantify it or multiple aspects that can be quantified. ...
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0answers
7 views

SPSS Syntax - Computing variable if a certain number of variables meet a given criteria

I have a question regarding syntax for recoding multiple variables into a new variable in SPSS. The set-up: I have 7 dichotomized variables (VAR1X, VAR2, VAR3, VAR4, VAR5, VAR6, VAR7) and want to ...
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0answers
37 views

Which test to use?

I'm trying to figure out which test I would run for a study. Our research question is does the degree of disc extrusion increase with various body positions compared to a supine (lie on their back) ...
1
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1answer
88 views

Regression: very basic questions [closed]

I am about to implement the regression. Since I am analyzing on my own, and have almost zero practical know-how of statistics, I doubt myself a lot (plus the results I have obtained so far look 'weird'...
0
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1answer
35 views

Mixed ANOVA, all Sigs = .000?

I made sure everything was done correctly, why would Mixed Anova results in a P value = .000 in all tables, please?
0
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0answers
36 views

Mixed-Design ANOVA Confusion: Do I separate my treatment Column?

In this particular study, I had 40 experimental subjects which were randomly allocated to 2 treatment groups. After the initial treatment, each where randomised to receive 2 other treatments. So the ...
0
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0answers
23 views

Beta coefficient of dummy variables [duplicate]

I have a regression model with 1 quantitative variable and 2 dummy variables : y = β0 + β1*x + β2*D2 + β3*D3 How exactly do you calculate the beta coefficients of the variables in this equation ...
0
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1answer
86 views

Would “percentage of correct answers” be considered interval or ratio data?

I'm currently working on a research assignment an I'm trying to determine whether a dependent variable like "percentage of correct answers" would be considered interval or ratio data. I was originally ...
0
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0answers
26 views

Variable types or which analysis to use

I am not sure on which analysis type I should use for the following experimental design. Participants are shown 20 items, and after each item display, they have to rate each on a 0 or 1 scale. This ...
2
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0answers
26 views

Ordinal or Interval Level of Measurement?

If we have a score of number of students in a kindergarden, which goes "one, two, three, four, five, six and more", is this variable interval or ordinal? The differences between them are exact, yet ...
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0answers
3 views

Is it possible to update an aggregated dataset by changing the reference group by which an indicator is mesaured?

I have a publicly available dataset that I am using for a project. The data is aggregated on the neighborhood level and the data is originally from the US Census. The data I have from this dataset ...
1
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1answer
62 views

What would cause Random Forest to not predict the values on the tails?

In the scatterplot below you can seen that my Random Forest prediction does not predict values at the extremes(i.e above 200) on my test data. My training data has values in that range, just not that ...
0
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1answer
38 views

Computing new variable of nominal and scale z scores variables

I'm analyzing a set of data where participants' reaction time and number of errors made during the task were measured. As there were two trials (where same data was measured) I was thinking I could ...
0
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1answer
362 views

Difference between conditioned and conditioning variable?

Is there any technical difference between a conditioned and conditioning variable? E.g. see below picture Can I call both X ...
1
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2answers
649 views

What type of data are dates?

According to Yale: Categorical variables represent types of data which may be divided into groups (Lacey M, 1997) To me, dates do not fit this definition. They are ordinal, as one date is ...
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0answers
21 views

1 IV with two categories and 5 DV, which statistical test to choose? [duplicate]

I'm wondering which statistical test to chose to find out which of my five DV is the difference between Country X and Country Y not statistically significant? My Variables are: 1 Independent ...
1
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0answers
9 views

Multi Variable datasets

I've a dataset that contains several attributes and a KPI column. I would like to understand through statistics which of the attributes are more important or key attributes in influencing this KPI ...