# Questions tagged [model]

A formalization of relationships between stochastically (randomly) related variables in the form of mathematical equations. DO NOT USE THIS TAG BY ITSELF: always include a more specific one.

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### how to measure significance of improvement between two methods during modeling

Hello everyone I have two methods for developing models. I use a set of input features (set1) for training model1 and another set of input features which have (set1 features + extra set2 features). I ...
43 views

### How to grade the prediction accuracy with how evenly distributed the test data is

Can anyone provide a method for measuring the even distribution of a dataset. I've come up with an example to illustrate the type of problem I am trying to solve, whereby I would like to measure the ...
1 vote
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### How to convert residual predictions back to original unit in a multiple regression model

I am trying to use a multiple-linear regression model based on observed air temperature (ta) and precipitation (pr) time series ...
30 views

### Adjusted R^2 or Lack of Fit

This might be a basic question, but I'll still ask, as I haven't found any proper conclusions from the forums. I'm fitting my data using the Response Surface methodology. So, ideally, the relation ...
33 views

### How to improve probability distribution fitting

I am trying to fit a distribution to daily percentage returns, and have got the following, where the p-val is low, suggesting it was not normally distributed. However, it's not perfect, and I try to ...
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### When authors write "model of the data" is this a shorthand for "model of the data generating process" [duplicate]

Some authors, such as Barber in Bayesian Reasoning and Machine Learning and Rasmussen & Williams in Gaussian Processes for Machine Learning, write phrases such as "model of the data" and ...
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### Can I model the interaction between a continuous variable and two factors separately for each factor?

I'm wondering if I can model the effect of the interaction between a continuous variable and two factors in a model without including the three-way interaction between the two factors. Let's imagine I ...
1 vote
33 views

### Fitting a model with multiple inputs, multiple outputs, multiple parameters, and covariance matrices for each data point

This question is the theoretical counterpart to another question posted on StackOverflow, where I asked about the implementation of the fitting algorithm using Scipy or lmfit libraries for Python. ...
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1 vote
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### Which statistical model is suitable?

I have the results of a survey of $n=132$ patients with their socio-economic profile and their spending behavior on mobility-coins (my thesis topic). In the survey, we asked people how they would ...
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### Bootstrapping Methods for Logistic Regression Models

I have a continuous numeric predictor variable and a continuous numeric response variable (the response variable is bounded by 0 and 1, and there are 0s and 1s in the response column, but the ...
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### Should I use parameter standard deviations or standard errors when bootstrapping to generate confidence intervals about logistic regression models?

I have binary response data that I've modeled using simple logistic regression. I have data from a few species and from several individuals of each species. I've modeled each individual separately, so ...
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### How does a logistic ordinal regression model learn the interaction between the features?

I have a dataset of informations about students and the last column is the target variable which is the final note. My goal is to make logistic regression and ordinal regression models to see whether ...
1 vote
53 views

### Several regressions with different dependent variables

I'm working on a project where I want to compare two groups of participants based on several different metrics. Right now, I'm estimating separate regressions with different dependent variables (i.e. ...
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1 vote
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### Variance of ARMA$\left(2,2\right)$ model

Find $Var(∇Y_t)$ if $Y_t = 5 + 2Y_{t-1} - 1.7Y_{t-2} + 0.7Y_{t-3} + e_t - 0.5e_{t-1} + 0.25e_{t-2}$. I've reduced this down to $∇Y_t = 5 + ∇Y_{t-1} - 0.7∇Y_{t-2} + e_t - 0.5e_{t-1} + 0.25e_{t-2}$. ...
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### A good variable to make a regression model for gas usage over the years for a city

so I'm new to statistics, I'm trying to make a regression model in Excel, explaining why, or due to what variable, does the gas usage change over the years. I tried using a basic Y variable - Time - ...
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1 vote
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### confusion about random effects summaries from lme and tab_model SjPlot

I am running into two issues. As such, I am not confident in my interpretation of summary estimates from the Random Effects part of lme function. I used the ...
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### Simple structure for selecting machine learning model

I recently came up with the following structure to assess which models work best for some simple classification tasks. Assume that we have some labelled multivariate data, already splitted into X and ...
1 vote
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### Can raw means and estimated marginal means be the same ? And when?

I have read a lot about calculating raw (standard) means and EMM. First are data based (descriptive stats), the latter are model based. I try to learn how to calculate both of them. In my example both ...
1k views

### What would be a good model to fit to cumulative reputation on Stack Exchange?

I'm trying to model the distribution of my cumulated reputation on one Stack Exchange site over time (that is, each data point is the sum of my reputation whenever that reputation changes, mostly ...
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### Interpreting output from sum constrast model

I have a question following the great response @DaveArmstrong answered in this topic about sum contrast coding. To first introduce my problem, have a model to account for species richness which is: <...
39 views

### Difference between a distribution model and a regression model

Kindly help me with the difference between a distribution model and regression model as related to randomness
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### Modeling quesion, linear regression or survival analysis

I am analyzing a dataset where the outcome variable is "teenagers' recreational drug use in weeks." This is continuous and highly skewed outcome variable. While the range spans from 2 weeks ...
1 vote
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### GLS Function - Fitting and Interpretation Issues

I am well aware, that this is a FAQ, but other questions could not provide me answers to my question. Also, I hope this will not be considered a double post, since I have posted this issue with a ...
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1 vote
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### Statistical models for simultaneous study designs

I have thinking about a problem that can be encountered in environmental epidemiology, but I guess in other research fields too. Background: In environmental epidemiology the interest is mostly to ...
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