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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### help with Linear regression with nfl stats please

Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

• Replies: 3
• Views: 4,285
04-09-2011, 01:19 AM
2. ### Regression with latent variable

Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

• Replies: 3
• Views: 6,966
04-17-2011, 01:11 PM
3. ### Easy Questions: Simple regression

Hi, I have three questions for you on which I have issues: Should I use correlation test or simple regression: that "ratio data" is...

• Replies: 3
• Views: 2,803
04-21-2011, 03:51 PM
4. ### Homogeneity of regression slopes

If assumption of homogeneity of regression slopes broken in ANCOVA analysis, what to do? Can I use linear regression instead? Thanks

• Replies: 3
• Views: 5,896
04-23-2012, 04:55 AM
5. ### 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: 13,184
04-27-2011, 02:11 AM
6. ### 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: 1,929
05-06-2011, 12:55 PM
7. ### 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: 2,578
05-11-2011, 09:01 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: 2,655
05-16-2011, 12:07 PM
9. ### 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: 6,257
05-12-2011, 12:58 PM
10. ### 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: 2,982
05-18-2011, 09:18 PM
11. ### Interaction term

Hi, I'm running linear regressions (1) Y = a + b and (2) Y = a + b + axb The coefficients for a and b in (1) have positive signs which are...

• Replies: 3
• Views: 2,995
dou
05-23-2011, 04:49 AM
12. ### Large coefficient problem

Hello, i'm running linear regressions for a large cross country panel data: the simplified term is similar to y = a + b + axb. When I run...

• Replies: 3
• Views: 3,025
05-23-2011, 05:20 AM
13. ### Sphericity

Hi! I'm Planning on running a simulation, and one of my conditions I'm varying is whether a set of variables Meet the sphericity assumption in a 1...

• Replies: 3
• Views: 2,686
06-24-2011, 11:59 AM
14. ### Multiple Moderated Regression Help!

Hi folks, i need help regarding multiple moderated regresison analysis in SPSS. I have one independent variable (X), one Dependent variable (Y)...

• Replies: 3
• Views: 3,457
08-27-2011, 09:42 AM
15. ### Can I compare models like this ?

Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

• Replies: 3
• Views: 1,849
07-05-2011, 01:46 AM
16. ### Find the affect of introducing a variable into a Data Set

Good morning, Everyone! I apologize, but I must admit that it's been a few years since I've been engaged in any statistical analysis; that being...

• Replies: 3
• Views: 3,097
07-11-2011, 08:21 PM
17. ### A new comer has a question about multicollinearty problem

I am running a OLS model with 9 IVs. The model results are good (a fitting model), but I got a high negative multicollinearity problem for two IVs...

• Replies: 3
• Views: 2,400
08-09-2011, 02:51 PM
18. ### Power-law relation (Help Please)

Hi there, I wonder if you can kindly help me with questions below 1) I have data to apply for a power-law relation (A=B*C^D). I am using excel to...

• Replies: 3
• Views: 2,201
07-26-2011, 09:28 PM
19. ### deviance

can anybody please tell me why we need to multiply difference of likelyhoods by "-2"? Where this 2 came from, why not 3? Could not find answer

• Replies: 3
• Views: 2,174
07-29-2011, 11:24 AM
20. ### Research Question Regarding Logistic Regression

Hi all, I am conducting a medical study with n=179 subjects and have something like 30 independent variables that I am comparing to 1 outcome. I...

• Replies: 3
• Views: 2,777
08-16-2011, 12:32 PM
21. ### Help with collinearity

Hi, I have a collinearity problem with my data. How do I deal with this? the variable which has collinearity is important, so I can't remove it from...

• Replies: 3
• Views: 2,424
08-16-2011, 10:40 AM
22. ### Multiple Linear Regression in Environmental Justice Analysis

Hi, I have 982 data points (census block groups) for which I have information on % minority and low income, and levels of air pollution. I did MLR...

• Replies: 3
• Views: 3,132
08-18-2011, 04:50 PM
23. ### 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: 5,223
BGM
08-22-2011, 11:49 PM
24. ### Logistic Regression

I am having difficulty performing logistic regression in SPSS due to missing data. Any suggestions for controlling for missing data in logistic...

• Replies: 3
• Views: 2,544
09-11-2011, 08:14 PM
25. ### Novice needs help with Maximum Likelihood Estimation of Logit Model

Hi all, I’d be grateful for some help. I realise this is perhaps elementary stuff for many but as someone without a formal statistics background, I...

• Replies: 3
• Views: 3,446
09-16-2011, 09:21 AM
26. ### Simple guidance needed (regression & interaction terms) plz

Hi guys - I've been searching around online for a while and even have a textbook but I'm still confused and require guidance from someone. Running...

• Replies: 3
• Views: 2,378
09-21-2011, 12:37 PM
27. ### The Connection between conditional expectation and unconditional expectation

William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

• Replies: 3
• Views: 12,467
10-02-2011, 02:18 PM
28. ### GLM Interpretation - confused.com

Hi Folks, This may seem pretty straight forward to many of you but I'm could really do with some help. I'm using the generalized linear model to...

• Replies: 3
• Views: 3,093
11-01-2011, 09:46 AM
29. ### Help on a project!!!

I am doing a school project and trying to find a relationship between government deficit/GDP (dependent variable) and inflation, interest rate,...

• Replies: 3
• Views: 1,945
10-26-2011, 05:51 PM
30. ### Drawing polynomial out of regression results table of a fixed effects regression

Dear all, maby its a simple question but I could not find a compelling answer in books or papers: I run a fixed effects regression giving me a...

• Replies: 3
• Views: 2,788
10-15-2011, 04:06 PM
31. ### Least Square Estimators

When we only have sample size of 2,can we still calculate the least squares estimators for alpha and beta? ?

• Replies: 3
• Views: 1,911
10-13-2011, 06:43 PM
32. ### Orthogonal projection onto linear span.

Hi there. I was hoping someone could give me a starting point on this problem because I'm clueless. given y = x1 =

• Replies: 3
• Views: 3,623
BGM
10-24-2011, 12:55 PM
33. ### Logistic Regression: model selection and interpretation

Good Day!! Hi I am working for the first time with logistic regressions and I have some doubts about the model selection and the result that is...

• Replies: 3
• Views: 5,411
11-16-2011, 03:17 PM
34. ### Durbin-Watson table

Hi.. Anyone here know how to determine whether we violated the assumption for durbin watson test... i found the table but the max sample size is...

• Replies: 3
• Views: 4,927
11-29-2011, 11:11 AM
35. ### Interpreting Interaction Terms

I am working on a regression analysis problem where we have to see if there is an interaction between two of the independent (X) variables. I run...

• Replies: 3
• Views: 1,958
11-30-2011, 12:26 PM
36. ### Question about a question

Thanks for the help!

• Replies: 3
• Views: 2,811
12-03-2011, 09:59 AM
37. ### Proportion of positive reponses in a logistic regression

Hello, When we do a logistic regression to predict a dichotomous variable (yes/no), should there be some minimum proportion of yes to no responses...

• Replies: 3
• Views: 2,634
12-02-2011, 06:30 AM
38. ### Correlation between reaction time (RT) and accuracy.

In a two choice task, for each participant, I want to show that the faster is RT, the higher is the probability for incorrect response. Is it...

• Replies: 3
• Views: 4,033
12-24-2011, 01:23 PM
39. ### confidence intervals for linear regression

Hi, newbie here, so please forgive the bad terminology. I started with ten years of historical data. I used Excel to give me a linear trendline and...

• Replies: 3
• Views: 3,578
01-11-2012, 09:13 PM
40. ### [SOLVED] Logistic Regression - Confidence Intervals

Hi I'm running a logistig regression in SPSS 16.0 and have come across the following issue: when testing for different confidence intervals (95%,...

• Replies: 3
• Views: 2,076
01-10-2012, 12:27 PM
41. ### Multiple logistic regression intercept

Hello guys and gals, I'm having a me***own trying to understand exactly what the intercept of a multiple logistic regression is telling me/ or if...

• Replies: 3
• Views: 3,351
03-13-2012, 12:29 AM
42. ### Question: Time-Series-Cross-Section Data

My data: Number of units: 290. Number of years: 4. The units are not sampled. Analysis technique I was thinking of doing an ordinary least...

• Replies: 3
• Views: 4,088
01-30-2012, 06:43 AM
43. ### Logistic Regression: Testing for interaction effects with many covariates

Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

• Replies: 3
• Views: 9,839
01-20-2012, 01:01 PM
44. ### Linear model accounting for fixed effects vs. ordered probit

I originally ran an ordered probit model on an ordinal dependent variable (values 1-12), however in order to account for fixed effects in my analysis...

• Replies: 3
• Views: 3,787
02-05-2012, 01:44 PM
45. ### Relation between 2 linear regression curves

Hello Everyone, I'm new here, I'm hoping someone may be able to help me as Im a bit stuck. Its probably so simple but for some reason this problem...

• Replies: 3
• Views: 1,697
02-09-2012, 05:35 PM
46. ### Multiple Regression and Confounding Factors

I am working on my thesis project which involves analyzing whether a dichotomous independent variable has an effect on a continuous dependent...

• Replies: 3
• Views: 10,559
02-13-2012, 09:45 AM
47. ### meaningful value for R squared

Hi, I did a simple linear regression with two variables (X & Y), both scores that were calculated (mean) on the basis of scores for the items of...

• Replies: 3
• Views: 5,273
02-13-2012, 09:20 AM
48. ### Comparing regressions

Hi, I want to conduct a sensitivity analysis on a regression to check if the results are highly influenced by the sample I have. Basically, I want...

• Replies: 3
• Views: 2,207
02-16-2012, 12:40 PM
49. ### Help! model comparison in logistic regression

Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

• Replies: 3
• Views: 3,098
edi
03-16-2012, 03:17 AM
50. ### Transforming dependent variable

I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

• Replies: 3
• Views: 4,908
03-20-2012, 07:17 AM
51. ### Is my sample too big ?

Hello, I have a sample of 20 continuous variables, along with 3 explanatory (2 continuous and 1 dummy). I am trying to run a regression, linear...

• Replies: 3
• Views: 3,012
03-26-2012, 10:55 AM
52. ### Poisson data pairwise comparisons valid?

Hi everyone, I'm a bit confused if what I am doing is valid. I thought I would get your two cents worth. I have done a poisson linear...

• Replies: 3
• Views: 2,859
03-30-2012, 02:46 PM
53. ### Principal component analysis before regression anallysis

Hi this is my first post and i've searched for this answer in vain. I have 50 participants in an experiment i conducted and i want to use a...

• Replies: 3
• Views: 2,981
03-31-2012, 10:22 AM
54. ### Mallows Cp selection

I am using the best subsets method in Minitab to select the best parameters for a multiple regression, but I'm a bit confused on Mallows Cp. Some...

• Replies: 3
• Views: 16,673
04-01-2012, 02:13 PM
55. ### Is this data acceptable for a multiple regression?

Hi all, I have data from a community with MIN size (g) MAX size (g) MAX size without neighbours (g), Height (cm) and Area (cm^2). I have this for...

• Replies: 3
• Views: 2,133
04-02-2012, 01:58 PM
56. ### Help with "nominal" variables and dummy coding

Hi. First of all, I'm sorry for not writing 100% correct as this is not my everyday language :) My quetion I'm working with linear...

• Replies: 3
• Views: 2,851
04-21-2012, 03:07 AM
57. ### Logistic regression analysis - Large beta coefficients

Hi, I have just run a logistic regression analysis on 7 IVs and a dichotomous DV. The IVs are regression-weighted composite scores of Likert scale...

• Replies: 3
• Views: 4,521
05-01-2012, 02:46 AM

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