Tagged Questions

1
vote
0answers
105 views

Significance testing for different groups in multiple regression with dummy-coded interaction variables

Consider a multiple regression predicting outcome Y using a continuous predictor P and an interaction between ...
0
votes
0answers
30 views

how to evaluate the importance of different levels of one predictor

This question is a little bit different. Say, I have 4 predictors (all categorical variables with multiple levels), and 1 response variable (binary 0/1). I used a logistic regression model, and found ...
3
votes
0answers
82 views

Appropriate statistics for proportions where categories are composites of independent binary variables?

I have data in the form of three digit binary numbers (i.e. 100, 101, etc.) scored for each individual in my samples taken from two populations I wish to compare. The three numbers represent ...
2
votes
1answer
91 views

Regression - significance of a variable

I have been running a linear regression, and one of the variables was a discrete variable (3 categories), decoded into three binary variables. I ran the regression in Stata. The first of those three ...
3
votes
2answers
150 views

Dummy's, significant and not significant

I have in my model two dummy's, for a categorical variable with 3 categories (native, EU-immigrant and non-EU-immigrant). The reference category is 'native'. These are merely control variables. Now ...
0
votes
2answers
225 views

Testing statistical significance of male vs female enrolment preference percentages between two different fields of education

The problem I have is as follows. I have enrolment data describing the number of male and female preferences for two broad fields of education: i) Information Technology and ii) Engineering. The ...
0
votes
1answer
138 views

Which one consider when dealing with dummy variables: Exact Sig. (2-sided) or Exact Sig. (1-sided)?

I'm running a cross tab of one categorical variable against a dummy variable. This dummy variable indicates the presence or absence of a company characteristic(if the company is industrial it should ...
2
votes
3answers
336 views

Comparing observed data to simulated data?

I have a set of observed values (shown with black dots in the figure) that I would like to compare to some simulated data (100 simulated datasets shown as box plots with quartiles, extremes (excluding ...
2
votes
1answer
1k views

How to test the statistical significance for categorical variable in linear regression?

If in a linear regression I have categorical variable... how do I know the stastical signifance of the categorical variable? Let's say the factor $X_1$ has 10 levels... there will be 10 different ...
3
votes
1answer
292 views

Characterizing datasets and estimating statistically significant differences?

I have four datasets: D1, D2, D3 and D4. Each dataset contains elements (different sample size in each dataset) that can be described by 100 categories (1 represents that the element belongs to that ...
4
votes
1answer
690 views

Probit estimation - insignificant coefficients with a significant difference

I'm a postgraduate economics student but not of the statistically inclined sort :) Im running a regression to estimate the likelihood of a patent being litigated. I have two dummies for the patent ...
1
vote
0answers
82 views

Identification of significant variables where dependent variable is categorical

I have a set of some 50,000 data points. There is one dependent variable which is categorical in nature and there are some 100 possible explanatory variables. Out of these 100, I have to select some ...
1
vote
1answer
252 views

Is it possible to compare multiple proportions in subdata sets?

There is one medical data set which contains 3 treatments: A, B, and C. The response variable is Yes/No. However, due to a specific medical reason, the dataset needs to be split into several ...
4
votes
1answer
292 views

$\chi^2$ test of homogeneity for three-way contingency table

I have a three-way contingency table in which the marginal totals for two sides are fixed and for the third are random. I'm wondering how to perform a chi-square test for homogeneity for such a ...