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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### How to approach model selection

Hi, This is my first formal attempt at a regression analysis that we hope to write up and submit. Basically we're wanting to investigate the effect...

• Replies: 4
• Views: 2,947
05-21-2011, 02:07 AM
2. ### Precautions when using multiply imputed data in pooled OLS regression

Dear all I am doing a straightforward pooled linear regression on a panel dataset (45 countries, 20 years) using OLS and relevant time dummies and...

• Replies: 0
• Views: 1,992
05-20-2011, 04:17 AM
3. ### Ratings of spotlights

I'd like to maximize my candlepower per dollar for spotlights. The packaging may list one or two parameters of watts, lumens or candlepower and I'd...

• Replies: 4
• Views: 2,476
05-19-2011, 01:00 PM
4. ### Generalised Least Squares VS Multilevel Modeling...

hello guys! i've been trying to wrap my head around this question for a while... if i understand things correctly, generalised least squares (GLS) is...

• Replies: 3
• Views: 3,004
05-18-2011, 09:18 PM
5. ### Help with Exam Question?

Given, Y = alpha + betaX + error What is the danger of applying OLS to estimate and make inference on such a model…….describe how to test if...

• Replies: 0
• Views: 1,314
05-18-2011, 06:00 AM
6. ### Event Study with illiquid stock prices

Hello, I am trying to conduct an event study on 250 stocks. Not every stock is liquid and as a result occasionally the price is absent or zero....

• Replies: 0
• Views: 2,350
05-17-2011, 01:22 PM
7. ### 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: 3,096
05-16-2011, 10:06 PM
8. ### Anomoly detection using regression

Hi There, X1 X2 and X3 are three observations made on a system. All three variables are the response of the system and it is seen theoretically...

• Replies: 0
• Views: 1,902
05-16-2011, 06:58 PM
9. ### Nonlinear models vs nonlinear parameters

The book G.A.F Seber "Linear Regression Analysis" (Wiley, 1977) says after the formula (3.3) that the model Yi = b0 + b1*exp(-b2*Xi)+ei is...

• Replies: 0
• Views: 1,658
05-16-2011, 04:07 PM

Hi there, First of all please excuse my lack of knowledge of the subject I have just started a course in Econometrics and find using the...

• Replies: 3
• Views: 2,700
05-16-2011, 12:07 PM
11. ### Standardized Linear Regression Help

Hello, I'm a bit confused about what exactly plays the most important role in understanding correlations- the r or the probability? And which is...

• Replies: 1
• Views: 2,388
05-16-2011, 10:07 AM
12. ### Logistic regression model returns lower than expected logit

Hi all, I'm using a logistic regression model with 3 variables to separate true positives from errors in a data set. All in all it seems to...

• Replies: 0
• Views: 1,727
05-12-2011, 01:39 PM
13. ### Help Regarding Linear Regression in SPSS (R Square help)

Hi, this is my situation for a Human Resources research project. I have 100 respondents and 14 questions. All the questions are simple tick...

• Replies: 3
• Views: 6,298
05-12-2011, 12:58 PM
14. ### Industry-Year regressions - excluding observations - need advice

Hello, I am trying to run firm-year specific regressions in SAS to get to an expected value for industry-year. However, I need to exclude the i'th...

• Replies: 0
• Views: 2,360
05-12-2011, 08:47 AM
15. ### What type of regression?

I am trying to determine if there is a relationship between two variables and how strong it is... Each patient has: number of comorbidities and...

• Replies: 3
• Views: 2,607
05-11-2011, 09:01 PM
16. ### assumption of linearity in the logit and transformation of continuous IV

Hello, I am doing logistic regression in spss for my phd research. Testing the assumption of the linearity in the logit I included in the analysis...

• Replies: 0
• Views: 3,799
05-11-2011, 04:28 AM
17. ### how to get an error estimate from a regression equation

I am working with regression equations that were generated from biological data, plugging in values of x to get y. In addition to the y values, I...

• Replies: 1
• Views: 1,690
05-09-2011, 12:40 PM
18. ### Regression Analysis w/Dummy Variable

I am trying to run a regression on a dataset. The dataset has the regions listed as 1, 2, 3, and 4. To run a regression, do i need to recode these...

• Replies: 2
• Views: 3,057
05-09-2011, 10:49 AM
19. ### Question regarding dummy variable and parameter equation.

Hi, I am doing assignment and it requires me to develop a conceptual model and parameter equivalent to show my understanding in data analysis. So,...

• Replies: 0
• Views: 2,008
05-08-2011, 07:45 AM
20. ### Data for regression analysis

I am helping a friend with a project involving regression analysis. First off he wants to know if there is a way to determine if the extracted data...

• Replies: 4
• Views: 2,403
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05-07-2011, 11:53 AM
21. ### Help with regression SpSS

I am currently working on my master's thesis on Drunk Driving. Unfortunately my chair is very unhelpful and we have had lack of training using SPSS...

• Replies: 0
• Views: 1,781
05-06-2011, 02:18 PM
22. ### Some help with exam preparation please

Hi everyone! I'm studying for a stats exam and I am stuck on a few questions. Any help would be appreciated. Here are the coefficients and S.E.s...

• Replies: 3
• Views: 1,950
05-06-2011, 12:55 PM
23. ### Special case of independent variable

Hi guys, I have a question on how to deal with a specific independent variable in a logistic regression model. The independent variable is a...

• Replies: 0
• Views: 1,716
05-06-2011, 02:31 AM
24. ### Did I just fudge this categorical data transformation too much?

I have a public data set gathered from 336 hospitals, with about 28,000 rows. I want to see if there is relationship between a particular input...

• Replies: 7
• Views: 3,754
05-05-2011, 05:05 PM
25. ### Calculating confidence bands for nonlinear regression

Hi, I am trying to find a way to calculate the 95% confidence bands for nonlinear regression. I have found the following text on the web, but I do...

• Replies: 0
• Views: 2,847
05-05-2011, 11:53 AM
26. ### Multiple regression - Best predictor

Hello there! I am studying for a final exam next week and I'm not sure about this. How do we determine the "best predictor" in multiple...

• Replies: 2
• Views: 7,651
05-04-2011, 08:23 AM
27. ### Stationarity of Seasonal Box-Jenkins Model

We've been working on group projects where we were given a set a of seasonal data, and from it create a Box-Jenkins model. In class, we were that...

• Replies: 0
• Views: 2,249
05-03-2011, 02:50 AM
28. ### Regularized Canonical Correlation Analysis

Hi, I have a question about sample size and regularized canonical correlation analysis. Is a sample size of 15 unreasonable to use in a regularized...

• Replies: 0
• Views: 2,053
05-01-2011, 08:05 PM
29. ### Calculate the MSE of s-squared

Consider the multiple regression model y=Xb+u where u~N(0,sigma-squared times identity) where b is a Kx1 vector, X is a non-stochastic full rank...

• Replies: 0
• Views: 3,143
05-01-2011, 06:35 AM
30. ### Multiple Linear Regression w/ Categorical Predictor Variables (Linearity Assumption?)

Hi, How do we test the linearity assumption for categorical predictor variables such as gender? What kind of a transformation do I need to use?

• Replies: 0
• Views: 3,194
05-01-2011, 04:04 AM
31. ### Help with interpretation of Wald, chow, t-tests

Sorry about the double post - it is in the elementary forum as well. But I should have put it here to begin with. Thanks in advance. I hope you...

• Replies: 1
• Views: 7,008
04-30-2011, 05:30 PM
32. ### Panel data, two measurment, what methods? Fixed effect models?

In need of assistance! I have two datasets, one from 1998 and one from 2006 that have been merged using ID-numbers. In 1998 I measure if the...

• Replies: 0
• Views: 1,504
04-30-2011, 04:24 PM
33. ### Confidence interval for coefficient of regression

Hi, I dont understand how we can find the CI when we dont know what is n ? My question says. c) Assume that Se^2 =12.84 and V(β)= Se^2/(sumX^1)...

• Replies: 2
• Views: 2,911
04-30-2011, 02:32 PM
34. ### 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: 1,981
04-30-2011, 12:59 PM
35. ### Logistic Regression- Multicollinearity?

Hi, I would really appreciate some guidance- I am running logistic regression equations with indepedent variables in SPSS, however there is a lot of...

• Replies: 2
• Views: 2,862
04-30-2011, 12:31 PM
36. ### Multiple regression

Hi, I have five factors for sixteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

• Replies: 1
• Views: 1,832
04-30-2011, 01:43 AM
37. ### House Price Regression - Need opinion and suggestion.

Hi everyone, This is my very first time running regression(am very excited :D) and any opinion and suggestion will be very welcome !! I have...

• Replies: 1
• Views: 2,843
04-30-2011, 01:06 AM
38. ### Impossible exam question!

I just got done taking an exam by an evil and cruel professor who likes to throw in problems that he's never discussed in class, never assigned for...

• Replies: 8
• Views: 4,503
04-29-2011, 11:00 PM
39. ### the t-values for regression coefficients

How can I calculate the t-values of the regression coeffs if I have the sample size and the correlation matrix only? Is this possible? Thanks in...

• Replies: 2
• Views: 2,407
04-29-2011, 09:13 AM
40. ### inverse transformation and reflection

Hi all, I'm doing a multiple regression analysis and my outcome variable is strongly positively skewed. Without transformation skewness = 2.10...

• Replies: 0
• Views: 2,850
04-29-2011, 05:18 AM
41. ### Is this the right way to do things?

So I have been trying to do a time-series regression to attempt to discover causality between a bunch of variables. I had 4 variables with around 25...

• Replies: 1
• Views: 1,607
04-27-2011, 03:44 PM
42. ### Assumptions for adding indicator variable

Hi, can you please tell me the assumptions that are needed to be satisfied before adding indicator variables? I have searched on internet but I...

• Replies: 2
• Views: 3,165
04-27-2011, 03:07 PM
43. ### Find expected value and variance of ARMA(1,1) model

My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

• Replies: 3
• Views: 13,275
04-27-2011, 02:11 AM
44. ### collinearity - incorrect sign?

I read from a book that the collinearity (or multicollinearity) could possibly lead the signs of the regression coefficients to being incorrect....

• Replies: 4
• Views: 3,263
04-26-2011, 02:43 AM
45. ### testing regressions

Hi, I have a very simple question: when I run a regression what are the things that I should test for to make sure that my regression is solid....

• Replies: 1
• Views: 2,242
04-25-2011, 10:14 AM

I am being asked whether certain interactions in a multiple logistic regression model with are subadditive or not. I was told to use a graph to...

• Replies: 1
• Views: 1,837
04-24-2011, 10:24 PM
47. ### Interpreting the coefficient in a NegBin regression

Hi, I am doing a regression on immigration in Denmark. My dependent variable is a count variable with the number of immigrants between two regions...

• Replies: 1
• Views: 12,622
04-24-2011, 07:33 PM
48. ### Partial regression plots in R

Hey guys, I'm slowly converting myself from an SPSS user to an R user. I'm running a pretty basic multiple regression model and want to produce...

• Replies: 1
• Views: 23,848
04-24-2011, 01:39 PM
49. ### Dealing with missing data?!

Hi guys, I was wondering if anyone can help me figure out what to do, I am pretty bad at statistics but needs must and all that! :p Basically...

• Replies: 7
• Views: 6,615
04-24-2011, 12:51 PM
50. ### Instrumental variables

I am doing monte carlo simulations and comparing OLS with instrumental variables estimates, however while most of my betas seem consistent when IV is...

• Replies: 1
• Views: 1,971
04-24-2011, 10:54 AM
51. ### Phonetics: Interactions without one of the main effects

I am using a logistic regression model with bias reduction in order to predict the contrast between /b/ and /p/ in Ojibwe based on acoustic...

• Replies: 5
• Views: 3,648
04-23-2011, 03:32 PM
52. ### Test Review HELP!!

this is a example for my test review and i dont know how to do b,c,d,e parts of it can someone tell me how to do it/the answer so i can better...

• Replies: 1
• Views: 3,469
04-23-2011, 11:18 AM
53. ### Correlation and Multiple Regression

Can you please help me understand the following questions - 1. Looking at correlations and scatterplots how can we determine if multiple regression...

• Replies: 0
• Views: 1,715
04-23-2011, 03:32 AM

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