# Tagged Questions

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### Dependent variables - BMI and Weight [on hold]

I have to figure out, which of the two variables (BMI and Weight) is the dependent. So I can make a scatterplot. Can you please tell me which one? And why? I tried searching the internet, but without ...
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### Ratio error propagation for dependent, paired variables

I've been struggling for some days with a statistical issue that is beyond my knowledge. Context: I'm studying the volume of cells, as well as their nucleus volume. These cells are categorized in 3 ...
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### How to compare 3 dependents conditions?

I have the result of an experiment for N subjects. The experiment results in 3 possibilities, the subject choose A, B or C. For each subject, the experiment is repeated 10 times. So I have ...
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### Different (Welch's) ANOVA tests and post hoc contradict paired tests. Which one to accept?

This is a problem that I think nothing would help but sharing my data here. I have 3 groups (n=7) which are paired. They are concentrations of a chemical compound in different parts fish tissue. For ...
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### Dependent variables with values on a (likert-type) scale

we'd like to conduct a study about the perceived valuation between two persons (let's say A and B that have different characteristics). Therefore, for our dependent variable, we'd like to ask ...
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### How to minimize dependency between existing model and retraining dataset (using fraud modeling as example)?

What are methods to minimize dependencies between the existing model in production and the data that will be used for retraining future models (when future samples are created based on the existing ...
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### Taking logs to supress hetroskedasticity

i am told that by loging variables in a regression that hetroskedasticity of errors can be reduced. is this the case also if only my dependent variable is logged? Thank you
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### Covariance between nominal and continuous variables?

I have an nominal independent variable (two groups) and a continuous dependent variable. A two-tailed Mann-Whitney test yields a significant difference between the two groups (p < 0.03; my data is ...
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### Strange results when applying Wilcoxon test in R

I am interested in whether the mean of one sample is statistically greater than the mean of the other one. The samples are not independent in that if the ith observation in sample A is positive, than ...
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### Multiple values in a variable for linear regression

Say I have a data set that I am trying to perform a linear least squares regression on. Suppose that the end goal is to predict y from x. The training data set I am working with has the form ...
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### Variance of grouped or hierarchical data

I'm coming at this from a non-pure stats background, so apologies if it's a simple problem.. Imagine there are 5 students who take 10 exams each. This gives a sample of 50 marks. I can naively ...
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### Are samples dependent or independent, paired or unpaired?

An animal performs a task in a T-maze. Sometimes he chooses the right part of the maze (right trials) and sometimes left(left trials). I want to know if there are differences in firing rate of one ...
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### Can i do regression without dependent variable?

I have a dataset of auto thefts that has the date, day, time the thefts occurred on. My independent variables would be day of the week, month, hour of the day etc. I want to see if auto thefts is ...
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### Correlation between different variables and among the group

I'm not a statistician, just a learner and facing problem in my research. I performed experiment on 25 subjects and collected data from 3 different locations (muscles, say A, B, C). The experiment ...
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### elite survey, pooling data without sufficient info to form a panel

i am working with a political candidate study which surveyed all candidates running at an election. I got two consecutive waves, or in other words, data for two elections. The response rates are about ...
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### Depandent or independent sample

I conduct research on dandelion's leaves. Throughout the growing season, I took pictures of leaves every two weeks. On the basis of the pictures I measured various parameters of the leaf (for example: ...
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### Formulating dependent variable for dynamic panel analysis

I would like to formulate dynamic panel model. I have set of independent variables, that's not a problem. But dependent variable is problematic. It should indicate probability for one event to happen -...
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### Is it possible to test an interaction between an IV and (dichotomized) DV und the DV?

as my dependent variable (DV) showed a very high skewness (strongly positive) I was wondering of I might integrate the mean-or median splitted DV as additional independent variable in my model in ...
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### References on simulating a raster with spatial dependence

I've simulated an N-by-N raster in the following way: define a set $S$ containing a finite number $|S| = K$ of possible raster values (in my simulation, $K=3$ and the elements of $S$ are land uses / ...
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### Setting up the target variable in a classification problem

Currently I’m working on a human resources project where I need to predict attrition. I have the active list of employees as on Sep’17 and the list of churned employees for different years starting ...
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### Correlation between a binary dependent variable and categorical independent variables

I'm constructing a logit model with a binary dependent variable (probability of exiting unemployment). On the right hand side (independent variables), I have a few continuous variables and a number of ...
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### independence/dependence when measuring the same subject?

Hey I read into dependent vs. independent samples but can't figure out what they are in my case. So I'll describe briefly what my samples are, and how I derived them. I have measured 4 muscles on 20 ...
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### Found my dependent variable is first difference stationary. Can I then use original variable?

I found my dependent variable is first difference stationary, but does this mean I have to use the first difference as my dependent variable? Or can I use my original variable as my dependent? My ...
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### The law of large numbers mediates predictor-outcome relation, what to do?

I am conducting a random forest analysis in which a predictor is naturally correlated to the outcome. That is, the predictor is the amount of sunlight a patient received during his admission in a ...
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### 2 dependent variables as proportion of 1 dependent variable in factorial design

I was measuring movement frequency using optogenetics in 3 genotypes of Drosophila larvae under 3 different light conditions. I therefore started out by carrying out a 3x3 mixed factorial ANOVA on the ...
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### time series in R multiple companies yearly sales data

I have 2010-2017 annual sales and total assets data for 100 different companies from pharmaceutical, dyes, chemicals industries. I have following questions: kindly help with the best way to fill the ...
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### How do you calculate the probability of seeing the same image in a set of 5 when the set is drawn randomly?

Given a webpage that displays 5 images drawn at random And given a pool of 70 images And assuming each image has an equally likely chance of being drawn And assuming if an image is drawn for 1 of the ...
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### What happens if you have a significant dependent t-test, and a significant correlation between the two?

I am testing participants RT's on two tasks. The two tasks each have two levels (congruent and incongruent) I am comparing Task1 congruent RT with Task2 congruent RT and then Task1 incongruent RT ...
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### How to rank dependent variables

Statistics and I are mortal enemies. I have an independent variable (gender) and four dependent variables (A,B,C,D). For each of the dependent variable, there were multiple questions with likert ...
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### Dependent variable is continous and categorical - how to regress?

My research is about password safety. As dependent variable I have the number of attempts a software needed to crack the respective passwords. This results in values in a range from approx. 1e+5 to 1e+...
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### Testing for mean difference in 3 subjects for a group of students

I am sorry if this is a naive question, but I wanted to have your suggestions before considering anything. Suppose I have a group of "n" students and I have their score in three courses: A, B, and C. ...