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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Regression suitability question

Hello, Could anyone help me out with some pointers please? I'm looking to use some statistics to help predict student % school absence rates...

• Replies: 4
• Views: 3,911
11-13-2011, 06:00 PM
2. ### Regression equation

my question is where did 105.9 and 13.1 come from??? and Where did the R 0.814 come from??

• Replies: 1
• Views: 2,421
11-14-2011, 10:43 PM
3. ### 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: 5,438
11-16-2011, 03:17 PM
4. ### how to calculate the significance of an R2 increase (based only on results in paper)

Recently I have come across several articles that report OLS results of models with increasing numbers of variables. In the articles the R2 and...

• Replies: 19
• Views: 21,766
11-17-2011, 09:27 AM
5. ### Question about coefficient change

Hi guys, I'm completely stuck with my statistical analysis so I was hoping you guys could help me out. This is the case: I did a research...

• Replies: 2
• Views: 2,284
11-17-2011, 10:33 PM
6. ### How to credibly downweight imputed values?

Hi All, First post here. I've googled all around trying to find an answer to my question, but I can't seem to find one, and pencil and paper isn't...

• Replies: 1
• Views: 2,570
11-17-2011, 10:38 PM
7. ### multigroup regression and interaction effects

Goal: Cross cultural research to validate the EAS measurement tool (see below). Two tools: EAS with 7 descriptive dimensions, each dimension...

• Replies: 1
• Views: 1,943
11-17-2011, 10:51 PM
8. ### Regression prediction question

My question is how do we get the 16, the one I have circled.

• Replies: 2
• Views: 2,556
11-18-2011, 05:18 PM
9. ### Cross sectional Regression Analysis

Hi, I am a currently doing my coursework on the factors impacting on the dividend policy in the financial sector in Mauritius. The problem is that...

• Replies: 1
• Views: 2,452
11-19-2011, 01:23 PM
10. ### Categorical variables and interaction in MLR

Would it be correct, to add in multiple linear regrression interaction between two categorical variables (i transformed them - dummy variavles) with...

• Replies: 9
• Views: 3,365
11-19-2011, 04:14 PM
11. ### Moderated Multiple Regression versus Factorial ANOVA.

I am analyzing an interaction effect between two continuous independent variables (Z and X) on a continuous dependent variable (Y). I have...

• Replies: 4
• Views: 4,622
11-20-2011, 07:23 AM
12. ### Testing the significance of the variance component of an itneraction effect...

hello peeps. so this is a question that i think anyone who works with R fitting mixed-effects linear models will find useful... i dont work around...

• Replies: 0
• Views: 2,354
11-20-2011, 03:52 PM
13. ### binary logistic regression output

Hi there, running up against a brick wall with this. Please help! Using binary logistic regression in SPSS. For my dependent variable I have 200...

• Replies: 2
• Views: 2,002
11-22-2011, 11:20 AM
14. ### application of regression model - which one to choose? please help

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: 3,163
11-22-2011, 02:03 PM
15. ### Beginner question

When I do a regression using monthly returns to get a beta using the CAPM, are the alpha and beta values also monthly? Thanks!

• Replies: 1
• Views: 1,870
11-23-2011, 04:06 AM
16. ### 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: 8,535
11-23-2011, 05:30 AM
17. ### Multilevel modeling with poission regression

Hi, I am using the software package HLM to perform a poisson regression on categorical data that is clustered. The responses are ranked in order...

• Replies: 0
• Views: 1,775
11-24-2011, 03:42 AM
18. ### Basic multiple regression question

Sorry, should've probably specified linear regression. I was given a data and ran a proc corr on it in sas. As you can see, x1 through x5...

• Replies: 7
• Views: 2,301
11-25-2011, 05:22 AM
19. ### confidence band from se in quadratic regression

Hi, I have the following problem: I want to draw confidence band for a quadratic regression I have the model: y=a+b*x+c*x^2, i have...

• Replies: 0
• Views: 1,477
11-25-2011, 07:29 AM
20. ### linear regression -- the regressor X is random

Hi, I am studying linear regression from the book titled, "Introduction to Linear Regression" by Montgomery. I am reviewing some previous...

• Replies: 0
• Views: 3,944
11-26-2011, 02:30 AM
21. ### Linear regression on seemingly linear data, but residual plot is a parabola?

So I did a linear regression on x y data that seemed very linear, but the residual plot was a a clear parabola. Next I did a 2nd order polynomial...

• Replies: 2
• Views: 6,087
11-27-2011, 05:56 AM
22. ### Possible to do a post hoc correction?

I am trying to understand a multiple regression problem I have. The problem is that one of my independent variables has a bivariate correlation to...

• Replies: 1
• Views: 2,152
11-27-2011, 12:04 PM
23. ### standardized beta that suddenly rise very high

Hi guys... i need help here... i don't understand why one of my variable (old_adult) standardized beta can increase from .144 which is not...

• Replies: 0
• Views: 1,884
11-27-2011, 11:29 PM
24. ### Calculating Covariance Matrix (Regression Analysis)

Im having difficulty in trying to compute the Covariance Matrix. I think Im missing out an equation to be honest. Here's what I've been given in the...

• Replies: 4
• Views: 6,915
11-28-2011, 04:36 PM
25. ### Logit versus Probit versus Linear Probability Coefficients

Hi all, Fairly simple question... What exactly are the meanings of the coefficients in logit, probit, and linear probability models? I'm staring...

• Replies: 2
• Views: 3,935
11-28-2011, 04:49 PM
26. ### 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: 4,939
11-29-2011, 11:11 AM
27. ### Rm anova ?

Hi guys, I need a confirmation... I have a research containing 4 groups, 3 treatments and a control group. For every subject, there are...

• Replies: 0
• Views: 1,615
11-29-2011, 01:51 PM
28. ### Panel Data Analysis, Help Urgently Needed! Fixed & Random effects, Fama MacBeth etc.

Hi, I have the following panel dataset: 11 years of annual data with a total of 250 observations. The panel is highly unbalanced, in the beginning...

• Replies: 0
• Views: 6,125
11-29-2011, 04:34 PM
29. ### Assumptions of logistic regression

Anyone know a good authoritative source for the assumptions of logistic regression? They differ obviously from OLS and I have not found a good source...

• Replies: 47
• Views: 81,414
11-29-2011, 07:40 PM
30. ### log-transformation and interaction effects

If I log-transform either one of my predictor variables or my outcome variable, can that change the significance of any of my interaction terms? ...

• Replies: 0
• Views: 3,899
11-29-2011, 07:51 PM
31. ### Displaying multiple regression

Dear stats experts - I wondering if it's possible to display a multiple regression with three predictors that are all significant on a graph. ...

• Replies: 0
• Views: 1,629
11-30-2011, 06:50 AM
32. ### 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: 1,966
11-30-2011, 12:26 PM
33. ### The Mediation Analysis by Regression

Hi All, Does Anyone Know a good reference to conduct the Mediation Analysis by Regression by SPSS? Many thanks, Gh

• Replies: 4
• Views: 3,096
12-01-2011, 12:13 PM
34. ### Beta positive - Slope of best fit line negative

hello, scratching my head over some regression output i'm getting from Excel. as you can see from below, the best fit line on my indeptendent...

• Replies: 16
• Views: 10,048
12-01-2011, 03:20 PM
35. ### 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: 2,644
12-02-2011, 06:30 AM
36. ### linear regression where the indepedant variables are parameters

I have a single independent variable, X, in the following regression model: Y = \beta_0 + \beta_1 * X + e where X = mean(X_xy) X_xy is a...

• Replies: 0
• Views: 1,824
12-02-2011, 10:29 AM
37. ### Model evaluation in logistic regression

I am doing the analysis in very recent forms of SAS (if any use that here). I ran a logistic model with a huge number of data points (some 11,000)....

• Replies: 6
• Views: 6,332
12-02-2011, 04:14 PM
38. ### Question about a question

Thanks for the help!

• Replies: 3
• Views: 2,821
12-03-2011, 09:59 AM
39. ### Can I trust a regression if variables are autocorrelated?

Hello everyone! Both variables (dependent and independent) show autocorrelation effects. When I run regression and estimate the residuals, they...

• Replies: 6
• Views: 2,752
12-04-2011, 10:59 AM
40. ### Advice for random effects with interaction term?

I have a continuous dependent variable A and a continuous independent variable B. I measured these variables in 12 locations that can be separated...

• Replies: 1
• Views: 3,776
12-05-2011, 03:26 PM
41. ### compare Spearman's correlations

Dear all, I performed several Spearman's correlation tests between the same independent variable and different dependent ones. All the...

• Replies: 2
• Views: 3,292
12-06-2011, 05:07 AM
42. ### Which method to compare models with truth?

Hi all, Edit: First I must say sorry for the ridiculous spelling mistake in the title! I wish I could go back and change 'two' to 'to'. I have...

• Replies: 4
• Views: 2,079
12-06-2011, 11:49 AM
43. ### negative binomial regression

hello all, i'm looking for some articles regarding negative binomial regression. i don't know much about general linear models or logistic...

• Replies: 2
• Views: 2,398
12-06-2011, 02:03 PM
44. ### GEE and sample size

Hello, I'd like to know how to correct for small sample size in GEE.

• Replies: 1
• Views: 2,941
12-07-2011, 03:44 PM
45. ### Ordinal Logistic vs. Multinomial Regression and program

I am trying to conceptually understand when I would use ordinal logistic vs. multinomial. It seems to me that if there is an order to the categories...

• Replies: 2
• Views: 2,824
12-07-2011, 08:04 PM
46. ### question about Logistic regression

Hi, I've wondered about logistic analysis. In glm(generalized linear model), link function value of mean = linear predictot. So, classical model's...

• Replies: 2
• Views: 2,060
12-08-2011, 07:50 AM
47. ### Testing a predictive algorithm

I have an algorithm that takes text data and predicts polarity of the data between -1 and 1. I want to test this algorithm for it's ability to...

• Replies: 7
• Views: 2,900
12-08-2011, 07:38 PM
48. ### Endogenous variable

Hi, I am implementing a two-stage OLS regression to account for the endogeneity of a variable. My instruments are time invariant. However, the...

• Replies: 1
• Views: 1,450
12-10-2011, 12:30 PM
49. ### How to pick the better model parameter in this example?

Let's say the model is fixed (e.g., a linear model where 5 coefficients need to be fit). Denote the parameter (coefficient) vector as \beta. ...

• Replies: 4
• Views: 1,832
12-10-2011, 03:07 PM
50. ### Can RSS be decreased to 0 when dimension increases?

Let's consider a simple example: I have two attributes X1 and X2, each has n values; response variable is Y. Using the two attributes together to...

• Replies: 7
• Views: 3,338
12-11-2011, 01:07 AM
51. ### 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: 55,535
12-11-2011, 12:32 PM
52. ### How to antilog a regression

Hi, My excel regression produced the following: Coefficient Constant 6.5804 Log(Unit_Produced) -0.4752 The...

• Replies: 4
• Views: 9,883
12-11-2011, 05:12 PM
53. ### partial r2 vs partial correlation vs stnd coefficients

Hi all, I have run a few linear regression models predicting water quality for watersheds using explanatory variables such as mean impervious...

• Replies: 9
• Views: 20,224
12-11-2011, 09:02 PM
54. ### Assumptions of Quantile Regression

Is equal variance an assumption of quantile regression? Does quantile or median regression have any assumptions? Thanks.

• Replies: 1
• Views: 3,251
12-12-2011, 02:07 AM
55. ### Help-The F or chi2 model statistic has been reported as missing

Hello All, I use Robust regression for event study- cross sectional. I have 25 industries dummies (0,1) in my regression and always "Adj...

• Replies: 0
• Views: 5,056
12-13-2011, 08:30 AM

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