# Tagged Questions

A statistical model is a formalization of relationships between variables in the form of mathematical equations. The model is statistical as the variables are not deterministically but stochastically related.

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### Do Precision-Recall vs Sensitivity-Specificity represent two cultures?

Why favor Sensitivity-Specificity over Precision-recall for model selection?
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### Validation for Household Relocation Model without validation set

We are working on several household relocation models based on census data. This data contained the location of many households over the course of three years, along with several other variables. The ...
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### How to add an interaction term in JAGS?

I'm trying to add an interaction term to a JAGS model. I found this where it shows some interaction terms. But I don't understand what's the guide lines to create an interaction term, which is ...
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### Is there a minimal percentage of a data set to have the property to be modelled?

We have a data set of about 45,000 observations. Around 2 % of these have the property that we're interested in modelling. We have made a probit model fitted to all 45,000 observations and get ...
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### Bayesian Dirichlet equivalent (BDe), Bayesian Dirichlet equivalent uniform (BDeu) and Mutual Information Test (MIT)

To estimate structures of Bayesian networks, I am thinking about three score functions, BDe, BDeu and MIT. I have several questions. What are the differences between BDe and BDeu? Can I convert BDe ...
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### Purposeful model building for prediction and inference

What are some of the best practices and steps to building models for prediction and or inferences? What have been taught to me during my classes was the steps outlined in Chapter 4 of Hosmer et al. ...
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### How to model GEE (generalized estimating equation) in data coming from two datasets?

I would like to model X (sentiment score, continuous between -1 and 1) and Y (smoking status, either 0 or 1). Individuals can be clustered by the "State" variable. It would be the most ideal if I ...
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### What are some viable models for all factor variables?

I have a dataset where everything, including my target dependent variable(s) are factors. Maybe I'm lacking creativity on this one, but what are some viable, predictive, models for something like this?...
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### How to deal with model misspecification - linktest

I am running an OLS model to examine to what degree is the physical quality of life (SF-12 scale) is associated with depression (HADS scale), adjusting by age and the presence of an acute illness (yes/...
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### confirmatory factor analysis for survey

I'm pretty new to confirmatory factor analysis and hope you can help me clear some questions. We are doing a workplace engagement survey in our organization. Our team chose approximately 150 ...
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### Is it accepted to fit model with standardized data and predict on non-standardized data? [duplicate]

If you standardize your training data, then can it work on unstandardized data during predictions accurately? Many algorithms require the feature data to be standardized and I am wondering how/why/...
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### Calculate AIC for random model (0 parameters)

I want to compare some action-selection models (e.g. soft-max and epsilon-greedy) to the simplest model I can think of. A random model, one that picks an action randomly among the available ones. To ...
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### Determining intentions on synonym phrases

I am building an app that works with the Stanford NLP Parser in order to annotate all the parts of the sentence. I can use those chunks to (more or less) understand what the user wants. Now, my ...
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### Predicted values in negative binomial model with 0-inflation

My count data are zero-inflated, for which I utilized glmmADMB. ...
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### How to build model given data only?

Given data only and without any (prior) knowledge or information about the data, how to construct a model for the data and predict new data? There are many statistical models but I have no idea which ...
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### Model for predicting Gentrification

I am looking for a way to design a model, which can in some way predict a gentrification process. I am using various indicators such as age structure, income, real estate prices etc. over a time ...
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### How to improve model by Bayesian Statistics/Inference? [closed]

I am puzzled about model improvement in implementing Bayesian statistics/inference. Normally, we will use a fixed model in bayesian statistics, e.g. normal distribution with parameter mean and sd. ...
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### Warnings using lme with a binomial distribution

Good morning all!I am trying to run a binomial gmler model. My response variable is a binomial variable: extra pair paternity -->( 1 or 0) I am looking at several continuous variables like weight, ...
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### Model to determine how many actions someone needs to continue

I need to think of a model to determine how many liked recommendations does a user need to come back to the site the next day. Until now, I did a model to determine the probability that each user ...
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### transition matrix for urn model

There are slides regrading to urn model I have two questions if a Species A dies and a Species A is born, the original text says the probability is 0.4*0.4, but since a Species A has died , ...
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### Power Model & linear regression model

What does it mean if linear regression coefficients and power model coefficients (using Log transformed value of explanatory variable) are same and only difference in intercept value? Thanks, Meera
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### Appropriate form of regression for gender pay modelling: The LASSO?

I'm aiming to identify which factors best explain the difference in hourly wages for men and women. The dataset contains 10-15 potential predictors which are of varying data types. Some examples: ...
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### Impulse response function of a SARIMA model

I really appreciate if someone could help me with some tips/Rcode to obtain the IRF of a SARIMA model estimated for a time series. What I want is to interpret the model estimated after an intervention ...
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### what other models are used to predict system resource needed to server increase in volume for an application

I am trying to use models to predict underlying cpu or memory needed to serve an application volume. For example, I have a data set like this: ...
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### Dealing with Unbalanced categorical data for prediction in R

I'm currently working on a predictive model concerning a dataset of 180521 observations for ~10 variables (including the predicted class). The predicted class is caracterized as below : True : 8058 ...
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### Building a Regression Tree with one Gaussian Mixture Model at each node

I am trying to build a regression tree that outputs both a mean and a covariance matrix for each leaf of the tree. Ideally I would be able to have a Gaussian Mixture Model at each leaf. A first ...
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### Fitting a model on continuous response variable using lme4 package in R? Factorial or Nested design?

I am trying to find the effect of plant traits on water infiltration and did some analysis using lme4 with the help of 2 statisticians, both of them suggest different models to check it. I can't ...
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### Using Conditional random field for many valued labels

I want to use the CRF for labeling a corpus of annotated text. Each word in the corpus has its own set of labels. More specifically, the labels are the pronunciations of each word: some words like "...
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### How to select automatically the best GLMM?

I have a set of 14 variables and I want to construct GLMM's. I want to include at first each variable and then add all the others, one at the time. This will require a lot of combinations of ...
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### Modelling dependence between two groups but not within effects in ANOVA

I have two conditions and in each condition, the same participants took part. however, I am not interested in how the value of an observation changes between the two conditions for each participant (i....
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### What is lm() compared to VAR()

What's the difference between # Fit Model # fit1 = lm(var$1 ~ var$2, data=data) and ...
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### Where can I find sound information about Periodic Autorregressive Multivariate models?

I am reading an article that mentions Periodic Autorregressive Multivariate Models and their noises; however, in no section have the authors explained or shown references to these models. I looked ...
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### Why would the intercept coefficient be higher than the the coefficients of the independent features?

I am a beginner in statistics and I can't seem to figure this out.. I have two models. Model 1, that contains all my independent features and model 2, that only has the features that show ...
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### Linear probability model and multinomial logit inconsistent signs

I have a dependent variable with three potential outcomes. When I run linear probability models independently on the dependent variables and compare the results to that of a multinomial logit model ...
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### Stacking/Blending Predictive Models with More than Two Outcomes

I've been experimenting with stacking predictive models recently. I've mainly been focused on looking at making meta-models based off of predictive probabilities of smaller models while implementing ...
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### Modeling periodic deviations for a varying norm

I have a continuous input that's more or less the same, though it varies slightly and somewhat periodically over time. Essentially randomly, a large deviation will occur for a period of time, after ...
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### Correlating model with measurements, trend vs absolute accuracy

I'm trying to compare results predicted by a complex model with measured results and don't know what the best method would be to do so. RMSE could give you an idea of the models absolute accuracy, but ...
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### Model comparison via AIC or BIC for different likelihood maximization procedures

Maximum likelihood estimation of different models (which all model the same variable and assume the same likelihood function) is done by a different method for each model. Simple numerical ...
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### Heteroskedastic errors may still explain more deviance?

Among a population, N = 1,100, you employ 10-iteration, 10-fold cross-validation on 1,000 observations using OLS model #1: $Y_i = \beta X + \epsilon$ This has an Adjusted $R^2$ of Q1 with a standard ...
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### Inner / outer model

i have created a SEM model and want to know while reporting which part should be treated as Structural model and which portion as and outer / measurement model . Whether i should take portion A or ...
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### simulation and model comparison

I created a simulation to compare a number of regression type models/estimators, lets call them M1, ...,Mn. for each iteration of the simulation run: I generate randomly data set X I generare ...
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### Interpreting output of analysis of deviance table from anova() model comparison

0 down vote favorite I have a large multivariate abundance data and I am interested in comparing multiple models that fit different combinations of three categorical predictor variables to my species ...
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### Parameter recovery study for a computational model: assessing model slopiness and practical implications

Consider a decision-making computational model with 6 free parameters. The model mimics human behavior: for a given decision-making task, it generates decision times and accuracy. For each parameter, ...
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### Suggestions to improve sem results

I wish to check the assumption that physical and mental health for elders are affected by two main latent factors the physical burden (PHB) and the emotional burden (EMB). The measurement model is as ...
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### study real-world process with an artificial model

I'm building a predictor for a classification problem. Some of the features are categorical, some are continuous, some are sparse, some are not. Unfortunately, the classes are very imbalanced, with ...
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### Specify a mixed effect model for per patient treatment effect and interactors for such effect

I have a study design setting where each patient received a treatment and was assed again after 30 days. the dependent variables are a set of symptoms and clinical values. I thought of a design where ...