# Questions tagged [variable]

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### How to model a continuous variable lying between [0,1] [duplicate]

I have a set of data in which the dependent variable Y is a continuous random variable in the interval [0,1] (i.e. it can take the value 0 and 1). This is an insurance dataset so the Y has many 0 (...
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### “Compound variables” Is this the correct terminology?

I am looking for a term to describe the concept of a multi-characteristic variable. Examples of this are a) vectors - have both magnitude and direction b) Olympic records - have both event (...
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### Putting into words variable transformation

If Y is a random variable which comes from a transformation of X : $Y = \phi(X)$, the formula for the tranformation of this random variable can be written as follows :  F_Y(y) = P(Y \leq y) = P(X \...
133 views

### BMI Category is qualitative or quantitative

I know for sure that BMI(Body Mass Index) is a quantitative variable as it is a continuous variable. But is that BMI Category derived from the BMI a qualitative variable or a quantitative variable? (...
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### Is a variable on scale 1-100 considered ratio or interval level?

Is the variable at ratio or interval level if it can take any value between 1 and 100 but not 0? I cannot determine using the definitions of ratio and interval variables.
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### Different Independent Variable value to Same Dependent Variable Value model selection

I would like to run a predictive model, but my DV records are repeated with different IV scenario. Could one please told me which model should I use in this case? Like Linear Regression, Decision Tree ...
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### Multivariate Regression: Both Continuous and Categorical Predictor Variables

I am involved in a meta-analysis assessing the role of multiple baseline characteristics (e.g. age, BMI, symptoms and signs) in a given disease. One element of our analysis includes a multivariate ...
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### creating a continuous variable from ordinal variables

Could I simply sum up ordinal variables (some 4-,some 7-scale) to create a continuous dummy variable, and include it in a regression model? E.g. ...
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### What is constant and variable error

What is constant error (CE) and variable error (VE)? I’ve seen the terms in several papers.
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### How do I designate a variable in a linear model to be a covariate in R?

So I want to make this equation for example: y = mu + Strain + Insect + Strain*Insect + BW_final Of all these variables, strain and Insect are controlled variables, but BW_final is an independent ...
13 views

### How to distinguish between a variable and a control factor in Anova design

Suppose I have an experiment in which participants are presented with different types of colored objects, hence 4 variables are introduced (i.e., blue, red, white, black). Participants are then ...
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### How do I interpret this dot chart? [duplicate]

I got this as a result (I can provide more information about the data itself if you would like it). I was curious about how one should interpret this chart that was created in R. I understand it has ...
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### Assigning weights to features for clustering

I want to run a K means clustering algorithm (using scipy/scikit) on a 1mn records dataset. I have a list of 5 features. Each of these features have a predetermined weight assigned to them: F1, 25% F2,...
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### Normalization/standardization in optimization problems

When working on optimization problem, do variables need to be standardized? Why or why not? Couldn't find too much literature on this.
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### Likert scale 0-4 or 1-5

I am conducting a study with Likert scale questions and my thesis advisor advised me to rescale the answers from 1-5 (strongly agree-strongly disagree) to 0-4. She says this will help in the ...
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### Multiple regression, simple regression or other?

I'm attempting to put together a research proposal where area knowledge (Western Asia) is my speciality but where the statistical methodology I need to answer my research question is not and I'm ...
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### Interpretation of Coefficients if Dependent Variable are Residuals from Another Regression Model

I try to model daily stock market trading volume with a bunch of independent variables like stock returns, stock price volatility, etc. in a time-series regression model. In the first place, I ...
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### Is data observed from the internet counted as primary data?

I need to find primary data (2 variable) to conduct a research about correlation. Are data that I observed from the internet (example: from youtube.com/amazon.com) counted as primary data?
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### Conditional Expectation(s) of Multiple Random Variables

I am having a bit of trouble with one of the problems I am working right now. The problem is: "What is $E\left \{ E\left \{ E\left \{ Z \mid X , Y \right \} \right \} \right \}$ ?" During an ...
25 views

### Categorical variable as independent variable [closed]

I am using the variable education level as a control variable and this variable consists of 7 education levels (1-7). Now I can't use it as it is converted in the data. My teacher has messaged me that ...
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### Dividing Two Random Variables

I am having trouble with a problem that I am working on for a course. I am not looking for an answer to the question (I have the answer), but I am rather looking for understanding of the concept. ...
35 views

### Standard Random Variable Notation

Perhaps this question is a bit basic for this area, so if this should go somewhere else, please let me know. I am having a bit of trouble understanding random variable notation. This is kind of ...
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### Correlation with variables with small differences in sample size

I have a sample of people, around 1140 participants but not all of them answered all questions. I have to do correlation with variables , each with different sample sizes. I have 3 variables and they ...
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### To determine the observation(or value) and variable in a given data

While reading "Statistics_The Art of Learning from data" book, we are given data to represent it in a histogram. I have read about the type of variables- i) Categorical variables(if observations on ...
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### Can you transform the dependent continuous variable in a Logistic Regression so that Y becomes bounded between [0;1]?

I want to use a Logistic regression and my dependent variable is continuous, it is a percentage. However, the percentage is technically not bounded between [0;1]. It can take a value up to 500%. If i'...
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### In a One-Way MANOVA, can one of the levels of the IV have a mean of 0 with a standard deviation of 0 on one of the dependent variables?

I realize that this sounds like a very stupid question, but I need to make sure—please stick with me. The project in question is a quantitative content analysis; for the sake of this example, let's ...
26 views

### Do percent variables need to be scaled for machine learning?

I have 101 independent variables in a logistic regression predictive model. 55 variables are continuous and 46 are categorical one-hot encoded. 5 of the 55 continuous variables are expressed as ...
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### Dichotomous independent variables and interpretation of regression output

I am running a regression on stata concerning the association of smoking intervention types upon participant age of first use. The dependent (age) is a discrete variable by age in years, while the ...
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### Differences between realization of the random variable and deterministic variable?

The first question is that can we classify variable into random variable and deterministic variable? The second question is that The possible values taken by a random variable"X"(Uppercase) are termed ...
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### Relationship of two variables over multiple time points

I am very inexperienced with statistics, so any help is appreciated! I would also greatly appreciate any recommended reading as well. We have a cohort of 10 subjects, whom we have looked at two ...
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### Accounting for Inter-Sample Collection Time Variability

I'm trying to run regression analysis on a dataset that features a pair of continuous variables that are collected at a certain time (in days). Whilst the data should be collected at a specific time, ...