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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### help with non-normality issue!

• Replies: 3
• Views: 1,116
06-23-2015, 06:37 AM
2. ### general mediation question

Hi guys Probably the easiest question ever but I can't really wrap my head around it. The setup of the research is as follow: X and M =...

• Replies: 1
• Views: 1,304
06-27-2015, 04:22 PM
3. ### Removing insignificant variables

Say I'm plotting a multivariate regression with five variables, and three of them come up statistically insignificant. Why is it important to try...

• Replies: 2
• Views: 7,508
03-21-2011, 01:49 AM
4. ### Statistical significance in linear vs logistic regression

Hey all, I'm running a multiple linear regression with a continuous Y variable and five continuous X variables (including a continuous-continuous...

• Replies: 0
• Views: 1,969
04-30-2011, 12:59 PM
5. ### Tolerable Heteroskedasticity/ Variance Inhomogenity

Hello, a long time ago I have read somewhere, that a regression can overcome heteroskedasticity/ variance inhomogenity up to certain amount. It...

• Replies: 2
• Views: 1,596
03-29-2015, 02:23 PM
6. ### Tolerable Serial Correlation/ Auto-Correlation by a Regression Analysis

Hi, is there a similar rule for the tolerable serial correlation/ auto-correlation by a regression analysis like the maximum-minimum quotient...

• Replies: 0
• Views: 1,178
03-29-2015, 02:31 PM
7. ### Error Propagation in Separate Binomial Logistic Regressions

On http://en.wikipedia.org/wiki/Multinomial_logistic_regression#Introduction is written, that the estimation errors of separate binomial logit models...

• Replies: 0
• Views: 840
02-12-2015, 03:08 PM
8. ### How to choose best robust regression model?

Hello. There are several robust regression methods like LAR-(aka LAV-, LAD-, L1-Norm-)Regression, Quantil-Regression, M-Estimator, ... They are...

• Replies: 15
• Views: 4,100
03-21-2017, 02:05 PM
9. ### Regression Assumptions for different time series models

I am reading a non-statistics book at the moment, which writes about statistics. Not a good constellation, I know. Unfortunately I do not have a...

• Replies: 5
• Views: 1,972
01-13-2014, 09:41 AM
10. ### Derivation of t-test for regression coefficient

Hello, at the moment I am researching, if the t-statistic is appropriate for a significance test of the regression coefficient on a dummy...

• Replies: 4
• Views: 2,287
12-28-2013, 12:36 PM
11. ### Degrees of Freedom in case of multiple regression?

What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

• Replies: 3
• Views: 4,392
07-19-2010, 10:21 AM
12. ### Sum of Residual equal to zero

I want to know why when you multiply the residual by Y_hat the sum of this new equation is still zero? So in other words I have summation from 1...

• Replies: 4
• Views: 10,290
08-07-2011, 11:17 PM
13. ### Variance of error

With the equation yi = B0 + B1xi + ei Does anyone know what the variance of ei_hat is suppose to equal? So far I have tried to split it the ei...

• Replies: 0
• Views: 3,287
08-08-2011, 01:15 AM
14. ### Least square estimates

(y1, x1)...(yn, xn) and (w1,x1),.....(wn,xn) are independent oberservations where x1...xn are fixed constants. Suppose we fit the first model yi = a1...

• Replies: 3
• Views: 5,234
BGM
08-22-2011, 11:49 PM
15. ### Covariance of residual

I'm given the mutiple regression equation Y = XB + e I have to find the covariance between e_hat and Y First what I did was changed e_hat =...

• Replies: 0
• Views: 3,682
09-03-2011, 08:52 PM
16. ### Appropriate Statistical Method :: Nonlinear Dynamic System Identification

Hey, I should probably mention beforehand, that I am relatively new to statistics. My problem is the following: I am doing nonlinear dynamic...

• Replies: 0
• Views: 1,600
08-06-2011, 08:31 AM
17. ### An easy question about Generalized Linear Model

Hello everyone, I just started using GLM and was stuck by an easy question of GLM. If I already obtain the estimates of the parameters, let's...

• Replies: 4
• Views: 2,366
07-18-2011, 02:02 PM
18. ### Country Variable

Hi Stata Experts, I have a question concerning an idea for my thesis. I have firm-specific data (assets, sales, income etc.) for different firms...

• Replies: 0
• Views: 1,097
10-11-2016, 08:27 AM
19. ### Multivariate Poisson regression

I have a linear model y=Ax where y and x are vectors and A is a matrix. The dimensionality of y is more than that of x. Further y has Poissonian...

• Replies: 2
• Views: 4,864
07-08-2010, 03:06 PM
20. ### Adaptive Lasso and CrossValidation for SNV selection

Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

• Replies: 3
• Views: 2,739
12-13-2016, 11:51 AM
21. ### Regression & Predictions

I have a problem to work out involving forecasting/predicting: Given multiple data sets (variables), I need to evaluate which set is the best...

• Replies: 1
• Views: 2,986
11-26-2007, 04:10 AM
22. ### How to improve regression fit, if I know that certain data points have an error

Dear all I am encountering a problem in my regression analysis with 1 independent and 1 dependent variable. In my plots, there are certain points...

• Replies: 1
• Views: 843
03-26-2014, 08:30 AM
23. ### Multiple Regression with Ratio as Independent Variable

I am doing a multiple regression and want to use a ratio (number of support staff to number of students) as an independent variable. Does dividing...

• Replies: 0
• Views: 908
04-24-2016, 09:48 PM
24. ### same variable: Single regression not stats sig but multiple regression stats sig?

Evening, IMy statistical query is that I am conducting a multiple regression ( step down - ommitting the non significant variables one by one). I...

• Replies: 2
• Views: 3,949
11-09-2011, 04:44 AM
25. ### Bootstrapping regression coefficients - count DV

Hi folks, I'm trying to plan some analyses for a project assessing how well some subscales measuring various facets of self-control (arguably...

• Replies: 0
• Views: 3,075
05-16-2011, 10:06 PM
26. ### The assumptions of multiple regression: An article by TalkStatters!

Hi everyone, A lot of you are aware of this already, but I'm posting this to a public subforum on Quark's suggestion :) Recently a group of 3...

• Replies: 3
• Views: 90,811
12-21-2015, 02:02 PM
27. ### 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: 1,545
08-01-2014, 05:35 PM
28. ### Bayesian GLM with missing data

Just while I'm on a roll with simple questions... I'm using MCMCregress {MCMCpack} to do a Bayesian regression in R. My dataset has a good chunk...

• Replies: 3
• Views: 1,981
07-31-2014, 09:23 PM
29. ### Assumptions of Linear Regression and Time Series

Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

• Replies: 1
• Views: 9,418
01-18-2012, 12:05 PM
30. ### Which one to use? Multiple Regression or Structured Equation Modeling

I am in the process of writing my dissertation. I have a question about statistical method. My study is to analyze the factors that affect...

• Replies: 2
• Views: 1,221
07-25-2013, 09:14 AM
31. ### Hierarchical regression for a complex model

So I am testing my own model but it is more complex than I have dealt with before. I know I need hierarchical regression, and I'm using SPSS (I have...

• Replies: 0
• Views: 847
08-21-2015, 03:45 PM
32. ### [Stata - Regression with categorical variables correlated] Multicollinearity

Hello! I'm currently working on my thesis and I have a problem. I'm doing a regression where many variables are categorical ones (profession,...

• Replies: 5
• Views: 3,212
06-21-2014, 08:25 AM
33. ### Dfbeta for categorical/dummy variables

Hello :) In my regression analysis (in Stata), I'm generating dfbetas. Can we take into account dfbeta of categorical or dummy variables higher...

• Replies: 0
• Views: 3,255
06-23-2014, 08:43 AM
34. ### Missing terms in Logistic Regression

I'm running a model that contains three treatments (control, proceduralcontrol, and treatment) and three feeding levels (nofeeding, chum, satiation)....

• Replies: 0
• Views: 1,101
12-04-2012, 09:01 PM
35. ### Validity of setting constant to zero

Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? For example, I have been...

• Replies: 0
• Views: 2,339
05-06-2009, 01:31 AM
36. ### Asymmetric confidence bands in nonlinear regression

Hi, I would like to know the formula for asymmetric confidence bands in nonlinear regression. Figure 6 on this webpage is exactly what I'm looking...

• Replies: 0
• Views: 2,544
10-19-2011, 02:43 PM
37. ### simplified version of earlier post about contrasting output in binary reg &outliers

I have conducted binary regression analysis for a single variable dummy coded into 15 dummy variables. My sample size was 512. My dissertation...

• Replies: 0
• Views: 954
07-08-2013, 01:35 AM
38. ### need help on contrasting outputs for blr enter vs stepwise and outliers

Hi Again! I am fairly new to stats and have come a long way. I have asked a few questions and this forum has been great for input, thanks! I have...

• Replies: 0
• Views: 1,355
07-07-2013, 03:17 PM
39. ### binary logistic regression using forward lr method in SPSS 21

Hello! I am brand new to all of this, including this forum - and statistics don't come naturally to me. I have just finished chapter 4 of a...

• Replies: 0
• Views: 3,739
06-29-2013, 10:20 PM
40. ### 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: 3,555
01-28-2014, 01:07 PM
41. ### Specific and common variables

Hello! I'm trying to build a regression model for forecasting. The problem is that some parameters, are common for all observations and one of them...

• Replies: 5
• Views: 1,907
05-06-2013, 12:08 PM
42. ### help with different sample size contrast matrix in linear regression

Hi everyone, I am very confused about the contrast matrix, could some one explain a little bit for me? Or could you please give a link or book...

• Replies: 0
• Views: 760
07-03-2014, 09:04 PM
43. ### Importance of Normality Assumption for Hypothesis testing methods

Hello everyone! Can someone please share their thoughts on the following question with me. Methods of hypothesis testing usually has a...

• Replies: 1
• Views: 1,796
12-13-2013, 09:15 AM
44. ### Regression questions

I have answered the questions below can someone please check them to make sure i have them right. I have answered the questions but need to have...

• Replies: 2
• Views: 22,914
06-27-2008, 09:27 AM
45. ### Comparing relative importance within a subsample.

Hey everyone, I was wondering if there was a statistical technique that allowed you to compare the differences in effect sizes across two...

• Replies: 0
• Views: 973
09-06-2012, 01:52 PM
46. ### chemical analysis

Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

• Replies: 13
• Views: 2,008
03-10-2016, 11:56 AM
47. ### Alcoolimetric Table

Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

• Replies: 0
• Views: 1,229
05-20-2016, 09:10 AM
48. ### Still a count variable?

First off, I hope this is the right forum. I'm not sure which other one would be more appropriate for the question. I have a dependent variable...

• Replies: 6
• Views: 2,062
12-11-2012, 07:22 AM
49. ### An R question about GLM

I want to predict a set of proportions from a linear regression using glm in R. The model has a logit link but I want extract the variance-covariance...

• Replies: 0
• Views: 2,188
02-24-2011, 04:36 AM
50. ### regression analysis with non normal residuals

I am a relative novice at stats so I would appreciate any help on this. Please let me know if I need to provide any more info to answer the question....

• Replies: 0
• Views: 3,523
03-04-2011, 09:55 AM
51. ### fit an ARIMA-model with t -distributed innovation terms

Hello, I have to fit an ARIMA-model with t -distributed innovation terms (skew-t) with software R. If I use arima function (package "stats") I...

• Replies: 0
• Views: 842
01-22-2016, 10:41 AM
52. ### Predicting rare events using weight-adjusted logistic regression

This is a simulation study I adapted from sas website. Suppose my probably follows the following relationship, x=rannor(12342); ...

• Replies: 2
• Views: 4,102
04-09-2014, 02:26 PM
53. ### Struggling with regression analysis

Hi guys, I'm new to stats and I'm new on here! I have a homework question that I do not understand. A multiple regression, 3 explanatory...

• Replies: 1
• Views: 2,572
08-04-2013, 04:42 PM
54. ### stronger beta in multivariate than in univariate regression?

Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

• Replies: 1
• Views: 4,503
10-31-2013, 08:04 AM
55. ### Need my answers checked.. Am I right? Fingers crossed : )

Hey everyone, tomororw morning I am doing a statisctics exam but I had a few questions before I go in there. I have been reviewing the slides from...

• Replies: 0
• Views: 2,215
05-15-2007, 06:00 PM
56. ### Solve for the following values

I need to solve for a,b,c,d by hand showing calculations but I can't seem to find any equations that will help me here. We haven't been given any...

• Replies: 4
• Views: 2,569
03-11-2011, 01:50 PM

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