# Questions tagged [restrictions]

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### Inequality constraints (interval restrictions) with clogit (STATA)

I am trying to estimate a conditional logit model using clogit. I have to impose different restrictions, for example: utility function: U(ik) = b1 x1(ik) + b2 x2(ik) + b3 x3(ik) + e(ik) constraints: ...
1 vote
82 views

### graphical lasso with known precision matrix structure

I wonder if there is a way to estimate the precision matrix when certain elements are restricted to be zero? Suppose data are from $N(\mu,\Omega)$, where $\Omega=V^{-1}$, i.e. the precision matrix. ...
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### What is the most fitting distribution for "how much time each day" kind of variable?

I frequently encounter variables with values restricted in a known interval but otherwise looking like being normally distributed. A typical one is, say, time spent browsing internet each day. I am ...
23 views

### Regression with unrestricted betas

Say for, instance, if I were to regress a unrestricted model such as: $$Y_it=\beta_0+V_{it}(\gamma_0+\gamma_1X_{it})+D\chi_{it}+\epsilon_{it}$$ In which I would be mainly interested in obtaining the ...
126 views

### Packages interfering with other packages on R? [closed]

I am working on a long R studio script for an experiment (more than 3000 lines) with different kinds of analyses that are not too complicated but combined there a lot of different kinds of analyses ...
1 vote
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### Maximum likelihood estimator when $\sum_{j} \theta_j = 1$. How to impose this condition? [duplicate]

I have a sample $x_1,\dots,x_n \stackrel{iid}{\sim}f(;\boldsymbol{\theta})$, where $\boldsymbol{\theta} = (\theta_1,\dots,\theta_d)$, and , $0<\theta_j<1$, $\sum_{j=1}^d\theta_j = 1$. I can ...
37 views

### Omission of variable in regression model

I am currently solving a question about the omission of variables in a regression model. The question says that $R^2$ decreases after two variables are omitted in the model; I understand this part. ...
1 vote
700 views

### Significance of correlation with range restriction in x

Background Range restriction can happen in various study designs and it affects the results of bivariate correlation or in multiple regression, for example. In some cases the range restriction may be ... 111 views

### How to find all models that meet the pre-specified restrictions

Let's say I have a large number of predictors (e.g. 2000) and I'm facing the problem of choosing the linear regression model under following assumptions: There are few predictors that have to be ...
115 views

### Hypothesis test testing for monotonic group mean change

I wonder if there is a statistical hypothesis test testing whether group average monotonically increases across groups? For example, I have four treatment groups, A, B, C and D. I would like to test ...
30 views

### How to optimize two related objective functions?

Suppose we have two functions which are somewhat related in that if one increases, the other decreases in a non-linear fashion. The decision variables for one function may or may not be present for ...
48 views

### Restriction in bayesian likelihood expression

I'm doing MCMC simulation but I'm confused in some part of my model. I dont know which of my likelihood expression is right. My model is as following. $\gamma$ = $(\gamma_{1},\cdots,\gamma_{K})$ and ...
1 vote
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### How to test hypothesis with multiple 'or' restictions

I am seeking help to interpret a question and set up test procedures for a series of hypotheses (six in total, two of which I can answer). It is part of a weekly problem set we are given in class. The ...
1 vote
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1 vote
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### Testing for a non-zero, monotonic trend amongst 3 groups in a repeated-measures design

For each subject, we repeatedly measure 3 conditions for a scalar dependent variable. The research hypothesis is that there is a monotonic positive trend - that is, either 1<2<3 or 1=2<3 or 1&...