# Questions tagged [logistic]

Refers generally to statistical procedures that utilize the logistic function, most commonly various forms of logistic regression

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323 views

### Why would feature scaling cause overfitting?

I'm fitting a logistic regression to a simple two-feature dataset. The feature values range from about 1 to 100. When I scale the features (using scikit-learn StandardScaler), the in-sample ...
65 views

### Logistic regression on 3 covariates each with unequal sample size

I have 3 covariates $(x_1,x_2,x_3)$, each covariate takes only 2 values $\{0,1\}$ but each covariates have unequal sample size. $n(x_1)=79,\;n(x_2)=80,\; n(x_3)=77$ $x_1$:(60 zeros and 19 ones) ...
205 views

### How to interpret this binomial logistic regression output in R

I have run my logistic regression model to find out whether the gender of a test name is a predictor of the gender of the word assigned to the test name. ...
3k views

### Prediction using multinomial logit regression in R

I've got three variables, a factored (c) and two ordinal independent (a,b). Every variable has five categories (1,2,3,4,5). Thus, I fitted a multinomial logit regression (testus, see below) with the ...
1k views

### How to find cutoff values in multinomial regression?

Updated I have a data set with five continuous variables measuring an index in a population. For finding underlying classifications in the population based on the five observed variables, I did a ...
89 views

### What's the likelihood function in this case?

I have a data set with a binary response variable as non-zero survival cells (y=0) or zero survival cells (y=1), and I would like to build a model with explanatory variable X. I know that the most ...
967 views

### How to interpret the significance of logistic regression variable? Something analogous to a partial F test in logistic regression

For ordinary linear regression with Gaussian noise, it is easy to interpret the significance of a variable. This is consistent with a partial F test. The square of the t-test for the second variable ...
53 views

### How to treat a time rank in logistic regression?

For an analysis of user attrition I want to perform a logistic regression, using task difficulty and point in time (100 trials) for a math task. My guess is that high difficulty at a late point in ...
79 views

### Transform categorical variable

The goal is to design a variable to use in logistic regression which measures the importance of starting with possession of the ball in football. Possession is ...
136 views

### Can I test a proportion (k success out of n) against an expected probability obtained from a logistic GLM?

I have a logistic regression model which is obtained from literature about the probability of developing a toxicity ($y_{i}=1$ or $0$) when patients are given dose $X_{i}$. $X_{i}$ is a continuous ...
68 views

### Regression for categorical y and proportional and discrete xs

I have a model with a categorical dependent variable and independent variables that contain a proportional variable also. It appears that multinomial would be an ideal fit, but am not certain on how ...
697 views

### Less significant findings using conditional logistic regression

I used regular logistic regression on my dataset and got a few significant hits. However, since the data is 1:1 case-control matched data I decided to try using conditional logistic regression (...
211 views

### Goodness of fit vs. significance

If you had two models - one with a better fit, and one with predictors of higher significance - which one would you choose? Keep in mind that both models are considered a good fit. One has a 3% ...
545 views

### Transforming a continuous covariate into a discrete one in logistic regression

I am largely inexperienced in the area of logistic regression. I was wondering if there were a good way to transform a continuous covariate in a logistic regression into a discrete one by subdividing ...
74 views

### Find good features

I am trying to find out what variables are important in predicting how many points are scored in the first half of basketball games so I can plug these into a logistic regression. I know that betting ...
512 views

### Finite output in logistic regression with divergent glm algorithm

let m be my matrix of data ...
245 views

### Comparison with trial dependent chance level

I ran an experiment where each participant had to choose 1 image from a 4-image display and I measured whether the image they chose was from category A. I want to compare the average proportion of ...
147 views

### Using R in Java Project

I hope this question is not off topic on CV: I am currently fitting some different models (naive bayes, logistic regression...) in R which I up to now thought of as prototypes for a later Java ...
87 views

### Using logistic regression to fit a weird dataset

I have the variables $Y$, $x_{m1}$, $x_{m2}$, $\ldots$, $x_{mn}$, $x_{p1}$, $x_{p2}$, $\ldots$, $x_{pn}$, $x_{q1}$, $x_{q2}$, $\ldots$, $x_{qn}$. $Y$ is the class label (0 or 1). $x_{mj}$, $x_{pj}$ ...
77 views

### Using different variables for each dependent value in multinominal logistic regression

I am not sure if this is possible, but my question is - Is it possible to use different sets of independent variables in the same model for different values in a multinomial logistic regression model? ...
336 views

### Pooling data with unequal sample sizes

I have searched far and wide for a clear answer to my question (and am aware that a clear answer may not exist) and I'm hoping someone might be able to help me: I have survey data for 4 samples of ...
403 views

### Confusion while using lassoglm

I am trying to fit a logistic regression model with L1 regularization on my data. My data has just 12 examples with 150 features. So I used L1 regularization. Now when I use the lassoglm function like ...
98 views

### Centering to use a sparse covariate?

In my dataset, there's a binary response, some factors, and some covariates. In particular, there are some covariates that are always present when factor1=="A" and ...
372 views

### What are some software packages for doing panel aggregated logistic regression with no random or fixed effect intercept (not SAS)?

I am interested in doing Panel Aggregated Logistic Regression (aka Panel Binomial Logistic regression) without random intercept and I was wondering if anyone could suggest some existing packages. ...
583 views

### Weight variables to develop scoring algorithm

I am studying how to develop a prognostic index in medicine. I have read some articles and in all of them metholodgy is quite the same. Most of them use logistic regression, choose variables and build ...
4k views

### How do I conduct model selection for logistic regression in SPSS?

I am analyzing a set of clinical data where I try to predict an outcome by using certain covariates. I have already done univariate analysis and now am progressing to binary logistic regression, ...
863 views

### Generating and analyzing predicted data in JAGS

I am trying to model a logistic regression on data predicted from the results of a previous logistic regression, and am having trouble figuring out how to do it, either in OpenBUGS (BRugs) or JAGS (...
3k views

### How can I get stepwise selection for multinomial regression in SPSS to process?

I am using SPSS to analyze my data. It is multinomial regression I am using. I have 14 predictor variables of which 9 are categorical and 5 continuous. The response variable is categorical with three ...
2k views

### Logistic Regression and Linktest in Stata

When checking the fit of my logistic regression model through the linktest command in Stata, the results indicate that hatsq has been omitted due to collinearity. Does this result indicate that the ...
143 views

### 22 word frequency Variable has been selected for predicting whether tomorrow is up or down day (binary target), how to interpret

First of all, I appreciate lot of creator of this web and any attention on this question. I asked related question here: 52 variables after backward variable selection on logistic regression on 160 ...
120 views

### Coding the regresssion model with several binary variables

Say I have 5 binary variables and 2 normal variables. I want to get the probability of success, say one of the variable 1 or 0, 1 for success. How can I do that? I tried ...
932 views

### Using Rasch model to explain relationships between a set of dependent and independent variables

My research study is in development economics. My data consist of more than one independent variables (continuous and categorical) as well as more than one dependent variables (categorical 5-point ...
483 views

### Logistic regression with longitudinal data

I have longitudinal data (one measurement being continous and the other ordinal) and I want to fit a model which takes into account the correlation between these two measures. I am using stata. Can ...
25 views

### Protection levels and survival analysis of machinery?

I'm familiar with the basics of survival analysis; we use the cumulative distribution to ask, "What's the probability of a machine still being operable after X days of usage?" Eventually, ...
28 views

### Can we extract the non-significant variables by using stepwise algorithm?

In my logistic regression model, I want to remove all the significant variables and keep only the non-significant ones. Because I want to have only the variables that are not distinguished between « ...
320 views

### How to interpret normalized coefficients in logistic regression?

I trained a logistic regression model with 5 features per sample. Before training, I normalized the range of my features into [0,1] (MinMax scaler). After training, I received the following ...
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### Suggestions on binary classifiers for high dimensional categorical data set?

I have a binary classification problem with 210 variables (2 levels 0/1) and I am wondering how should I approach this problem as algorithms which I used (logistic regression, random forests) did very ...
982 views

### Lasso logistic cross validated error

I fitted a lasso logistic regression using glmnet. I use a pretty small dataset with only 51 (28/23) observations. I want to compare the model fit of two possible variable combinations. Only control ...
57 views

### Is logistic regression the best test for this study?

I have two independent variables (both categorical) and one dependent (categorical) variable. I want to look at the predictive factor or significance of those two independent variables (either ...
22 views

### How to understand if 2 very correlated predictors influence the output?

I have a binary output $y$ and a small set of predictors $x_1, x_2,\dotsc$ Two of these predictors are very correlated. It is known that one of them has influence on the output we want to know if ...
2k views

### binary logistic regression analysis (method=ENTER) model has all beta values are statistically non-significant

My binary logistic regression analysis (method=ENTER) model has all beta values are statistically non-significant. Should I include these predictors in the final binary logistic regression equation?
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### What are the preliminary analysis before running a logistic regression?

I have a dichotomous variable which represents if a student is accepted or not in a University. In order to do this I have about 60 variables (information of the students: gender, age, etc; their ...
197 views

### Comparing two logit models

Folks, Would appreciate any advice on the following topic. My question I would like to answer is the following. What are the determinants of being a First Time Buyer of a House? Based on a survey ...
263 views

### Is it ok to interpret the sign of an interaction term in a logit or probit model with random effects?

Is it ok to interpret the sign of an interaction term coeficiente in a logit or probit model with random effects? For example, Y=b0+b1*X1+b2*X2+b3*X1*X2 being Y binary (e.g. 1 if company i has ...
165 views

### Interpretation of chart in logistic regression

I built a model of logistic Regression examining whether a customer returns to buy after his first deal by the transaction amount (success is not return..). There are three parameters in the model, a ...
289 views

### Logistic regression repeated measures with binary outcome and continuous predictor

I am really a beginner in stats (and also in r) and would need a input on whether my statistical methodology for following research experiment is right: Study: I want to test the effect of the ...
50 views

### logistic and anova

In here, you can see original data. My data is $4\times3\times3\times2$ completely randomized design experiment data. I want to model the probability of survival in terms of the stimulus variables. ...
49 views

### multicollinarity issue

I ran a logistic regression moderation analyses and I noticed that with the addition of the interaction term, one of the predictors flipped signs. The variable (X) was previously -.015 and became .006 ...