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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Large logit coefficient - what it means

I am constructing a logit model with 6 explanators, trying to predict outcomes of hockey matches using odds (the variable I am referring to below)...

• Replies: 12
• Views: 8,128
03-12-2013, 06:06 PM
2. ### Interaction effect significant but main effects not

Hi all, I was wondering if anyone could give me a help with my logit. I have a DV of disease vs. non-disease and 3 IV: dummy-year (year 1 vs year...

• Replies: 12
• Views: 20,678
05-06-2013, 01:46 PM
3. ### Control Vairiables in Multiple regression

Hi, I hope someone can help me. I need to run multiple regression with 2 IVs and 1 DV and include a control variables. The control variable is...

• Replies: 12
• Views: 2,467
06-10-2013, 08:34 AM
4. ### Which kind of Regression should i use for this case?

Hello everyone, I'm new here and i have just begann with statistical research. I'd be very thankful if anyone could help me with my situation. I...

• Replies: 12
• Views: 2,224
07-07-2013, 04:35 PM
5. ### Regression with multiple type of independent and likert scale

Hi guys, I just discovered this forum and would appreciate any help because I have little background in stats! My research is about interruption...

• Replies: 12
• Views: 2,171
08-26-2013, 10:06 PM
6. ### Is it ok to have coefficients in exponents?

Hi all, Pardon me for being so naive, but is it ok to have coefficient in exponents figure. actually I ran a regression model in stata by xtreg...

• Replies: 12
• Views: 2,202
08-28-2013, 03:54 PM
7. ### Determine how much data is required by determining when graph levels out

I have a bunch of graphs for data that I have collected in my last experiment. The graphs are usually shaped similar to either exponential curves or...

• Replies: 12
• Views: 2,004
07-15-2014, 06:52 AM
8. ### Importance of bias in estimators

I always thought that bias was the central issue in an estimator. The one thing you had to avoid above all else and the gold standard to evaluate the...

• Replies: 12
• Views: 3,177
12-30-2014, 02:46 PM
9. ### Dummy variables with categorical data with multiple levels.

This always seemed easy to me, largely because I always had an obvious reference group before or I was dealing with variables that had only 2 levels....

• Replies: 12
• Views: 2,773
03-21-2016, 08:13 AM
10. ### Stepwise Regression Limitations Explanation

I've recently been working on building a model and have come across a number of different approaches. I'm particularly interested in the limitations...

• Replies: 12
• Views: 1,492
05-04-2016, 06:39 PM
11. ### Multiple regression analysis: multicollinearity problem

Dear For my research I'm using interactions in a multiple regression analysis to test the influence of the IV on the DV with moderators. My...

• Replies: 12
• Views: 1,386
03-19-2017, 02:14 PM
12. ### Relative impact of regressors on Y.

A question I get asked a lot is, if we have these three predictors of Y, which of the 3 has the most, next most and least impact. I have tried...

• Replies: 12
• Views: 3,319
08-07-2017, 07:31 PM
13. ### I think this is a simple question but I can't seem to find it in my stats book

I have a linear regression equation (y=6.0707x-1200.2) that was used to develop 50 point estimates. The sum of these estimates is the point estimate...

• Replies: 12
• Views: 3,187
01-20-2017, 02:29 PM
14. ### Master thesis, statistics check!

About me: Medical student with minimal statistical knowledge or research experience Question related to: statistical regression/correlation...

• Replies: 12
• Views: 2,762
06-02-2017, 03:24 AM
15. ### Independent variables correlate to each other: violation of regression assumoptions?

Ok, so bear with me - total statistical idiot here, in way over his head. I'm running multiple regressions of plant cover against precipitation,...

• Replies: 11
• Views: 13,579
11-19-2008, 10:17 AM
16. ### Linear Regression: Mean square error (MSE) ?

Simple linear regression model: Y_i = β0 + β1*X_i + ε_i , i=1,...,n where n is the number of data points, ε_i is random error Let σ^2 = V(ε_i)...

• Replies: 11
• Views: 55,453
12-11-2011, 12:32 PM
17. ### Regression and Likert scale variable..HELP!

Hi everybody, I'm wondering if it is possible to run a multiple regression with a dependent variable measured on a 5-point Likert scale (where 1...

• Replies: 11
• Views: 9,361
11-01-2010, 04:45 AM
18. ### Logistic Regression with too many IV

Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

• Replies: 11
• Views: 6,822
04-01-2011, 12:45 PM
19. ### Use of Intercept Term in OLS Regression

When is it appropriate to exclude the intercept term from a standard OLS regression? The dependent variable is Sales (of a particular product) and...

• Replies: 11
• Views: 17,909
03-10-2014, 03:19 PM
20. ### (easy) Maximum Likelihood Regression question...

hello everyone. i am trying to get my head around a very easy example that i read somewhere explaining maximum likelihood estimation on the OLS...

• Replies: 11
• Views: 4,795
08-27-2011, 02:33 PM
21. ### why is the covariance of my residuals not 0?

hello there. i am trying to wrap my head around the assumption that, in regular OLS regression, the covariance of the residuals is 0. i worked out a...

• Replies: 11
• Views: 8,651
09-30-2011, 12:41 PM
22. ### Seasonality and dummy variables

Hey, I've got this econometric problem I could use some help with. I'm looking for day of the week effects in a certain index. I'm using a regression...

• Replies: 11
• Views: 8,493
11-23-2011, 05:30 AM
23. ### calculating sample size needed by future studies having got my Logistic Regression

Help anyone? I have downloaded Gpower 3, and seemingly found the option: under test family: z tests statistical test: logistic regression ...

• Replies: 11
• Views: 6,138
07-23-2012, 08:59 AM
24. ### Warning on Regression

Hi, I'm trying to run logistic regression analysis but on the output it showed warning: "There is not enough memory for this run. Memory is used...

• Replies: 11
• Views: 2,357
09-06-2012, 04:06 PM
25. ### Linear model + covariate issue

Hi! I'm hoping to run a logistic regression model and I've run up against a problem I'm not sure how to approach. We have some binary outcome...

• Replies: 11
• Views: 2,449
01-17-2013, 05:18 PM
26. ### regression, interactions and centering how does it work?

Hello everyone! So yesterday our prof explained to us that one of the reasons of why you "center" (meaning you substract the mean) from your...

• Replies: 11
• Views: 3,345
04-19-2013, 07:46 PM
27. ### Should I include this variable or not?

Hello, My dependent binary variable is Turnout in 2010 elections (yes/no) and I'm performing logit analysis using a cross-sectional dataset. ...

• Replies: 11
• Views: 2,003
04-23-2013, 02:01 PM
28. ### normality assumption in regression: THE FINAL ANSWER!!!

ok, maybe it's not *the* final answer, but here's a theory of where this may be coming from. ever since noetsi started asking this question about...

• Replies: 11
• Views: 3,285
07-02-2013, 09:48 AM
29. ### How to find beta in a regression model?

Dear all, This might be a silly question, however I am a newbie when it comes to Stats. Im currently writing my thesis and for this I am analysing...

• Replies: 11
• Views: 3,544
01-28-2014, 01:07 PM
30. ### Modelling percentages in the closed interval [0-1]

Hi all, I am trying to model percentages which are in the closed interval . Specifically, I am not modelling the probability of a yes/no outcome...

• Replies: 11
• Views: 2,799
01-10-2014, 11:14 AM
31. ### Choice of final model

There are many strategies for selecting a final model (and which variables are in the final model will likely influence the SE and the coefficients)....

• Replies: 11
• Views: 2,587
09-10-2014, 11:55 AM
32. ### correct regression model for dependent variable

Hi all, I am new to this forum and I hope that the qestions that are bothering me can be answered together with your help. I have data (N=220)...

• Replies: 11
• Views: 2,357
02-12-2015, 08:47 AM
33. ### Is R2 of multiple linear regression with 1 sign. predictor = R2 of simple lin. regr?

Hi everyone I always thaught that the resulting R^2 of a multiple linear regression with only 1 significant predictor would be equal to the...

• Replies: 11
• Views: 3,560
wep
09-10-2015, 10:52 AM
34. ### Logistic Regression predicted probability is either 1 or 0 (or literally 2.2204E-16)

I am doing a test logistic regression to predict whether employees will stay in the company for more than 3 years. After the model is trained, the...

• Replies: 11
• Views: 2,988
01-03-2016, 01:28 PM
35. ### Analysing a designed experiment - is the theory wrong?

hi, just had a scary thought . in all industrial DoEs we definitely have measurement error on the IVs. However I have always seen the OLS as the...

• Replies: 11
• Views: 1,357
07-18-2016, 11:07 AM
36. ### Condition to put regression analysis zero?

Under what situation intercept can be force to zero in regression analysis?

• Replies: 11
• Views: 1,522
05-14-2017, 10:36 PM
37. ### OLS vs solving a system of linear equaions

If i want to solve y=Xb, where y is a vector of observations and X a matrix of independent variables i could use ordinary least squares to estimate...

• Replies: 11
• Views: 463
09-20-2017, 08:06 AM
38. ### transform y to log(y)

Hi, I'm wondering what kind of data is appropriate for transforming the response y into log(y)? ( So the model becomes log(y)= a^x1 +...

• Replies: 10
• Views: 7,261
11-08-2010, 01:43 PM
39. ### interaction in logistic regression

Hi, I have run a moltinomial logistic regression and wanted to test for moderation effects of some variables so I tested the model with main effects...

• Replies: 10
• Views: 5,268
07-01-2011, 08:03 PM
40. ### which model to use?

I have a dependent variable that is limited and discrete (it goes from -9 to 9 in whole numbers), yet the residuals produced from a linear regression...

• Replies: 10
• Views: 3,242
08-03-2011, 01:34 PM
41. ### Linear Regression Without intercept ?

hello i m little confuse i want to know that when its is suitable to use regression without intercept ? Any advantage over using linear regression...

• Replies: 10
• Views: 28,631
08-21-2011, 02:34 AM

Hi all, for my master thesis I would like to investigate the human impact on behavior of sea lions. I have 3 different defined response variables...

• Replies: 10
• Views: 3,142
11-22-2011, 02:03 PM
43. ### Logistic regression (firm-level and country-level variables)

I am new to logistic regression and wonder how I can combine firm-level variables and country-level variables into the same regression. For the...

• Replies: 10
• Views: 2,883
01-02-2012, 10:45 PM
44. ### Simple Question Seasonal Autoregressive Model

Hi, I hope I'm posting this in an appropriate place. It's not exactly linear regression. If you have a seasonal moving average model like...

• Replies: 10
• Views: 3,143
01-11-2012, 02:27 PM
45. ### [SOLVED] How to interpret negative regression estimate?

Hi, I’m learning about regression analysis and have negative estimates for the grade-point average variable in two categories of a multinomial...

• Replies: 10
• Views: 4,775
02-03-2012, 03:10 AM
46. ### too many dummy variables

Hello I have a categorical independent variable, with 11 levels...so I need 10 dummy variables. I wanted to ask how can I analyze 10 dummy...

• Replies: 10
• Views: 7,434
07-20-2012, 02:55 AM
47. ### Urgent Help Required.....

Dear all, i am doing a research these days. but i am facing a difficulty in statistics analysis. Actually i have measured a quantity "A" in the...

• Replies: 10
• Views: 1,969
11-30-2012, 09:37 AM
48. ### Question on Interpreting Variable/Model Specification

Hello, I'm currently trying to run a model displaying the relationships of my independent variables with interactions on a feeling thermometer. The...

• Replies: 10
• Views: 2,072
04-30-2013, 11:26 AM
49. ### Multiple regression analysis for 3 groups

Hi I am doing a multiple regresion analysis for my project. If I have 3 groups which are nominal data (nationality: PL, ENG, and PL who moved to...

• Replies: 10
• Views: 3,099
03-10-2013, 05:01 PM
50. ### Violation of linearity assumption

Hi, I'm a beginner at statistics. I'm doing a simple linear regression and I have a scatterplot of the residuals versus the predicted values and I...

• Replies: 10
• Views: 4,667
03-09-2013, 10:47 AM

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