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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Incremental update to *existing* Logistic Regression model?

Hi, In our work, we have a large-scale logistic regression model we hate to train everyday. Is there a way we can somehow update the existing...

• Replies: 6
• Views: 8,878
05-28-2014, 03:18 AM
2. ### Cutoff points in logistic regression

One of the articles I am reading now makes reccomendations for changing the cuttoff point used in predicting whether Y=1 or 0. My question is, since...

• Replies: 6
• Views: 13,257
03-27-2014, 08:17 AM
3. ### SPSS - Logistic Regression - Continuous independent and moderating variables

Hi, I'm trying to analyse the relation between 4 independent variables and 1 dependant variable (yes=1, no=0), using Logistic Regression, in SPSS....

• Replies: 6
• Views: 2,855
09-29-2013, 11:46 PM
4. ### Logit Regression Odds when some possible outcomes have been removed

This is my first post of this forum. I'm working on a Logit Regression to predict the nominees and winners of various movie awards. Luckily, I...

• Replies: 6
• Views: 1,693
11-20-2013, 11:46 PM
5. ### 'Significant' product-term interaction but no significant simple main effect contrast

:wave: I'm conducting a conditional logistic regression to assess the association between a continuous predictor and a dichotomous outcome,...

• Replies: 6
• Views: 4,080
11-26-2013, 07:43 PM
6. ### Logistic Regression: attaching 95% CI to predicted probabilities

Hi All, I was wondering how calculate 95% CI for predicted probabilities. I have read how to do the same for odd-ratios, but the way in which what...

• Replies: 6
• Views: 9,831
12-02-2013, 04:54 PM
7. ### Logistic regression

Good afternoon, I write to you for 3 questions. Thanks for your help. When in a regression analysis the correct model is unknown before the...

• Replies: 6
• Views: 3,140
03-22-2014, 02:04 PM
8. ### Robust regression and normality test

Hi all, When running linear regression I identified certain outliers that influence the regression model, and after analyzing I decided that the...

• Replies: 6
• Views: 2,211
03-04-2014, 03:28 PM
9. ### Lag Length for Breusch Godfrey with Cross Sectional data

Hey guys, I am working on my master thesis and I use STATA. I have cross-sectional data with not really a time component. However I ordered my...

• Replies: 6
• Views: 6,535
03-04-2014, 01:53 PM
10. ### Grouping educational level in different variables

hi there! I'm trying to apply a regression model based on the Human Capital Theory. Besides other independent variables, I have grouped the...

• Replies: 6
• Views: 1,733
02-25-2014, 04:06 PM
11. ### Collinearity

I interacted two variables from my data, and I put the newly created variable on the RHS of my model. However it automatically dropped when I ran the...

• Replies: 6
• Views: 1,616
03-05-2014, 06:36 PM
12. ### Logistic regression - default in 3years time

I am running a logistic regression to estimate a firms probability to default. My data set covers 10 years data (2002-2011)with each firms' annual...

• Replies: 6
• Views: 1,953
06-09-2014, 11:41 PM
13. ### normality transformation and regression

Hi, I have performed 1/sqrtY, and sqrtY transformations on different data sets to achieve normal distribution for simple linear regressions. So...

• Replies: 6
• Views: 1,532
07-04-2014, 03:11 AM
14. ### Multiple Regression while variables kept constant

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• Replies: 6
• Views: 1,917
07-23-2014, 03:02 PM
15. ### Partial Least Square Regression_Interpretation of Result_VIP_Model Equation_urgentpls

Hello! I would like to ask your help about the interpretation of my results. So I am doing an analysis about which among the environmental predictors...

• Replies: 6
• Views: 1,808
07-26-2014, 11:53 AM
16. ### Interaction between time and time-varying between-subjects variable

I'm struggling with how to think about a question that seems like it should be really straightforward. I have some survey data about regrets...

• Replies: 6
• Views: 1,534
08-01-2014, 05:35 PM
17. ### Testing multiple interaction variables in logistic regression

Hi everyone, For a study that I'm currently conducting I want to know the effect of some of my variables on other variables, which I think should...

• Replies: 6
• Views: 2,275
08-04-2014, 07:11 PM
18. ### Can the PCA scores be used as variables in multiple linear regression

Hello, I used PCA to reduce the dimensions of a data set of 10 variables into 2 principal components (describing 82% of variance in data set of 10...

• Replies: 6
• Views: 1,893
08-31-2014, 04:04 AM

Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

• Replies: 6
• Views: 2,500
09-19-2014, 09:55 PM
20. ### range of tuning parameters

Hi All, I have just started my advanced statistics study. And here is one thing I have not been able to understand for long time -- how can we...

• Replies: 6
• Views: 2,645
10-01-2014, 07:09 PM
21. ### How to reduce variables in multiple linear regression when multicollinearity present?

Good morning, afternoon, evening to everyone. First and foremost, this is my innaugural post so I hope I am following all of the recommended...

• Replies: 6
• Views: 2,460
10-04-2014, 10:47 AM
22. ### regression models with mixed types of independent variables

I am working on building a forecasting model, the independent variables are grouped into three types: some variables are continuous; some variables...

• Replies: 6
• Views: 2,569
10-15-2014, 12:45 PM
23. ### Multivariate logistic regression analysis from patient data

I would like to conduct a multivariate regression analysis on patient data using essentially the following setup: Dependent: a continuous...

• Replies: 6
• Views: 2,218
12-27-2014, 06:05 AM
24. ### Poll: Question Regarding Regression in Biological Research--confusion over ordinal variable

To begin with, I am relatively unfamiliar with advanced statistics; I am familiar with elementary statistics such as Chi Square and Kruskal-Wallis...

• Replies: 6
• Views: 2,136
12-26-2014, 02:21 PM
25. ### Omnibus F-stat insignificant, anything left to say about reg. coefficients?

Hi there. I am calculating a multivariate regression by hand, and just calculated the F-stat for the model. Calculated F-stat = 4.899 Critical...

• Replies: 6
• Views: 2,404
01-03-2015, 08:13 AM
26. ### (SPSS) External validation for a linear regression model

Hello, I am investigating relationships of continuous variables and I am aiming at getting a model that can be generalized for the study. My DV is...

• Replies: 6
• Views: 3,036
wid
01-06-2015, 06:49 AM
27. ### Regression analysis

Hi all. Could I use linear regression with not normal distributed variable?

• Replies: 6
• Views: 2,247
04-06-2015, 11:39 AM
28. ### Regression help

I ran a regression of event sales (y) and advertising spending (x). I got the following results: Correlation: .055 R2: .003 N: 438 y = 1.28x +...

• Replies: 6
• Views: 1,956
04-07-2015, 10:16 AM
29. ### Comparing two linear regression gradients?

Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

• Replies: 6
• Views: 4,763
04-29-2015, 09:08 AM
30. ### optimal sample size

I'm performing a regression analysis (OLS) and I have the luxury that my sample size is very high (5.000 observations) compared to the number of...

• Replies: 6
• Views: 1,629
05-04-2015, 11:25 AM
31. ### Multiple Regression - Is it possible to constrain the coefficients to be positive?

Another stumper ... I am running a multiple regression with two independent variables. The regression results look good, except that one coefficient...

• Replies: 6
• Views: 1,924
05-11-2015, 07:26 PM
32. ### SPSS Logistic Regression Predicts Too Many Negatives?

Hello everybody, I have a logistic regression model, where the outcome Yes is coded as 1, No as 0. The split between Yes and No is about 30/70...

• Replies: 6
• Views: 1,638
08-01-2015, 02:28 AM
33. ### control for confounding variables using logistic regression

Hello... I'm in a project to investigate the prevalence of intrusive thoughts in patients diagnosed with major depressive disorder and non-clinical...

• Replies: 6
• Views: 1,856
09-08-2015, 03:39 PM
34. ### reading excel file /text file in R

I am naive programmer..i am working on regression analysis. when i say read.table("filename.txt",header=FALSE)..where does R searches for the file?...

• Replies: 6
• Views: 1,659
09-17-2015, 10:25 PM
35. ### Normal logistic regression vs a mixed model; which to use? benefits gained?

I have some evidence to suggest that one vaccine was far superior over another and resulted in the local elimination of a disease. Because it affects...

• Replies: 6
• Views: 1,942
09-29-2015, 11:23 AM
36. ### Testing a log transformed reg model with the non-log transformed

Hello, I was wondering how one test two regression models against each other. One being the log transformed of the other like this: y = var1 +...

• Replies: 6
• Views: 1,869
10-10-2015, 02:40 PM
37. ### Interpretation of the squared term coefficient in the presence of interaction

Hello dear form members, Please consider the following regression model: y = a + b1x1 + b2x1^2 + b3x2 + b4x1*x2 + e, Note that x1 is (1)...

• Replies: 6
• Views: 1,819
12-06-2015, 11:03 AM
38. ### Estimate a Logistic Regression Model

Hi guys, I want to estimate a logistic regression model's equation based on observed data and get the coefficients to extrapolate further. I have...

• Replies: 6
• Views: 2,520
12-04-2015, 01:18 AM

Hi, using a GLM model (e.g. a Poisson regression), there are various link functions available in statistical packages. However, I don't find an...

• Replies: 6
• Views: 1,427
01-13-2016, 04:03 PM
40. ### Regression Analysis for Paired Data SAS

Hi Everybody, I want to analyze paired data using regression analysis to adjust for covariates. I used PROC MIXED statement in SAS and I modeled...

• Replies: 6
• Views: 1,994
02-29-2016, 08:52 AM
41. ### Intercept becoming negative(More IDVs)

Hi All, I have a small query. When regressing revenue against cost, my intercept is positive for X% combos where each combo consists of data...

• Replies: 6
• Views: 1,464
03-18-2016, 04:08 PM
42. ### low frequency independent variable in logistic regression

I'm running a logistic regression and I think there's a variable that I'm not treating properly. I'm modeling traffic accidents (1) vs. no...

• Replies: 6
• Views: 1,805
04-06-2016, 07:06 AM
43. ### Writing down firth logistic regression equation

Hi, This is a really simple question that I'm sort of embarrassed I can't answer - how would you write down a firth logistic regression? Now to...

• Replies: 6
• Views: 1,582
04-27-2016, 12:59 PM
44. ### Repeated measures, random effects, or both?

Hi, I have the following situation and I do not know if it is a case that calls for repeated measures or individual-specific random effects. We...

• Replies: 6
• Views: 1,147
agp
05-18-2016, 08:08 AM
45. ### Interaction effect: only main effects significant

Dear community, I'm running a regression model to test, if there is a difference between the Eastern and Western Germans supporting redistribution...

• Replies: 6
• Views: 1,573
07-04-2016, 10:26 PM
46. ### How to study association between categorical variables?

I have 4 categorical variables in a dataset let X1, X2, X3 and Y. Where X1,X2 and Y is a binary random variable and X3 have 3 categories. X1,X2...

• Replies: 6
• Views: 1,236
07-10-2016, 07:00 PM
47. ### Interpreting an interaction effect

Hi All, Last year I ran an experiment where I measured the behaviour of a songbird (how long it took them to approach a speaker playing their...

• Replies: 6
• Views: 1,846
08-23-2016, 04:57 AM
48. ### What Kind of Regression Do I Need for This?

I have a data like this. I need to find 7 predictors' coefficients for the best model to predict dependent. It can only be 1 and 0. A B ...

• Replies: 6
• Views: 1,113
09-09-2016, 03:09 PM
49. ### GLM on non-linear/curvilinear data

Dear all! I’m sure somebody of you will help me with my non-linear data-problem. I measured a fitness correlate of an animal (response variable)...

• Replies: 6
• Views: 1,586
10-19-2016, 07:54 AM
50. ### Calculating predicted probabilities from a logistic regression model SPSS

Hello everyone, I am trying to calculate individual predicted probabilities from a logistic regression model with SPSS (to describe how a individual...

• Replies: 6
• Views: 5,141
11-01-2016, 03:52 PM
51. ### P-value for a regression where expected slope is 1:1

Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

• Replies: 6
• Views: 2,960
11-26-2016, 09:40 AM
52. ### What is spatial regression?

This is the first time I have heard of this technique . They are concerned with what they call spatial issues, for example how rural versus urban...

• Replies: 6
• Views: 2,584
01-09-2017, 02:41 PM
53. ### Exp(B) or CI values with the letter "E"

Dear all, I am running a Multinomial Log. Regression. Everything seems fine but I do not understand when Exp(B) oder CI values are like...

• Replies: 6
• Views: 3,037
01-27-2017, 11:42 AM

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