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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### GLM repeated measurements with very large database

I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

• Replies: 0
• Views: 2,908
01-27-2011, 08:42 AM
2. ### LSVD regression - how many dummies

hey, I'm back and making progress :) I want to run a LSDV regression on my panel data. How many dummies do I have to include? All of them for...

• Replies: 0
• Views: 2,678
01-27-2011, 09:13 AM
3. ### Help Non linear Growth Models - Derivates

Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion,...

• Replies: 0
• Views: 2,460
01-27-2011, 06:59 PM
4. ### Need help! Fairly simple questions.

Hey guys, So I successfully proved that the sum of epsilons (the e in y=B0+B1*x+e) equaled 0. Now how do I prove that the sum of xi's...

• Replies: 0
• Views: 2,293
01-27-2011, 09:29 PM
5. ### GEE prediction interval... Help?

Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

• Replies: 0
• Views: 2,451
01-30-2011, 03:33 PM
6. ### Help finding standard error

If i have following regression and numbers: Y(with a "hat" over)= -66,1058 + 0,0650X R^2= 0,9460 Se(standard error) = (10,7509) ( ...

• Replies: 0
• Views: 1,698
02-02-2011, 05:59 AM
7. ### Formulas for : CVRMSE and Net Mean Bias

Hi folks, I am in the energy industry, and we do linear/multilinear regressions stats. One of the concepts being introduced to supplement...

• Replies: 0
• Views: 3,602
02-03-2011, 12:53 PM
8. ### independant variables?

I'm a little confused on the whole dependent-independent thing.... I'm doing a multiple linear regression with 13 variables in order to predict...

• Replies: 0
• Views: 2,066
02-08-2011, 03:50 PM
9. ### Need help on a GMM estimation

Hello to all, I am trying to do a GMM estimation (with xtabond2) on a little sample of about 250 observation, but I cannot get a good result (in...

• Replies: 0
• Views: 2,481
02-13-2011, 02:59 PM
10. ### Interaction can change slope coefficients

Hi all, Would anyone be able to explain why an interactive regression model would have different main effects than an additive model of the same...

• Replies: 0
• Views: 2,133
02-15-2011, 10:46 PM
11. ### Error distribution and non linear models.

Ok, I am reformulating this question because it started rather silly. As I always point out, my background is not statistics so please excuse my...

• Replies: 0
• Views: 1,991
02-16-2011, 11:31 AM
12. ### Dealing with multi-level categorical variables in regression

Hi everyone, I have been working in R and using lmer() to run mixed-effect linear and logistic regression models to study language processing. ...

• Replies: 0
• Views: 5,914
02-16-2011, 02:37 PM
13. ### Fixed Effects Common Panel Regression versus GMM estimation

Hi, I have estimated my model using the Fixed Effects Common Panel method and this seems to work fine. I get an R2 of .90 However, I am now in...

• Replies: 0
• Views: 6,149
02-18-2011, 07:43 AM
14. ### Trouble standardizing regression slopes

Dear readers, Hopefully you can help me with the following problem. I am using meta-analytic software to perform a meta-analysis. When I...

• Replies: 0
• Views: 3,962
02-22-2011, 12:46 PM
15. ### Poisson Regression Offset -- Constrain to 1?

I have a regression where the observation time varies. I would like to use an offset. Right now, my time variables are . What does it mean to...

• Replies: 0
• Views: 2,681
02-22-2011, 04:44 PM
16. ### 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: 2,194
02-24-2011, 04:36 AM
17. ### Probit: Assumption e~N(0,1), why?

Good evening, I have got a question according the Probit-Model. In this model we always assume that the error term is standard normally...

• Replies: 0
• Views: 2,751
02-24-2011, 03:18 PM
18. ### GLM Parameter Estimation in R

Hello everyone! I was searching for GLM content, then I found this forum, so I thought you could help me :). I'm starting to study GLMs and I know...

• Replies: 0
• Views: 4,584
Kol
02-24-2011, 08:02 PM
19. ### Heteroscedasticity

I am new to this. I'm conducting analysis using standard multivariate regression and I've been look at some of the outputs from my model (I'm...

• Replies: 0
• Views: 3,087
02-24-2011, 09:18 PM
20. ### Probit Model: Liklihood Ratio Significant, Very Low Pseudo R-Square

I'm running a probit model in Stata, and I'm a bit confused by the results. The LR test is highly significant, .0000, but the Pseudo R-Square is very...

• Replies: 0
• Views: 5,032
02-25-2011, 02:34 AM
21. ### Discriminant Analysis Issue

Hello, I'm trying to make sense out of a recent discriminate analysis I ran which confused me. I got really a really low eigenvalue which...

• Replies: 0
• Views: 3,302
02-27-2011, 07:26 PM
22. ### Residualized Coefficient Using Solely Variances and Covariances

I just want to confirm that I'm on the right track. I need to derive an expression for b^Y1.2 that refers solely to variances and covariances...

• Replies: 0
• Views: 2,218
03-01-2011, 04:14 PM
23. ### Slope comparison in two-phase regression analysis

Hi I am using a two-phase regression analysis to analyze some physiological data. The analysis is based on using two, simple linear regressions...

• Replies: 0
• Views: 5,215
03-01-2011, 05:27 PM
24. ### Linear Regression Through a Point

Hi Everyone, I'm trying to find the slope of the regression line with the least squares fit which passes through a certain point (x_0,y_0) The...

• Replies: 0
• Views: 3,636
03-03-2011, 03:48 AM
25. ### 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: 3,534
03-04-2011, 09:55 AM
26. ### How to handle discrete predictors in a HLM?

Hi there, I have longitudinal data with several time-invariant predictors (age, gender, personality) and one dichotomous time-variant predictor...

• Replies: 0
• Views: 2,788
03-05-2011, 06:18 PM
27. ### Problems with adjustment in mediation model

I am using Baron & Kenny's procedure to test a mediation hypothesis. I realize that the field has evolved a little and others, such as Preacher &...

• Replies: 0
• Views: 2,409
03-05-2011, 06:48 PM
28. ### Linear regression on ranked data

The dependent variable consists of a set of ranks for two types of project: Logistics and Engineering, to which I've applied a normal transformation....

• Replies: 0
• Views: 4,887
03-08-2011, 03:37 PM
29. ### Combining Model Scores

Question for the regression modeling experts: I am looking for an efficient and correct way to combine model scores taking into account...

• Replies: 0
• Views: 4,560
03-09-2011, 04:40 PM
30. ### Std Error of nonlinear regression coefficients

Hi There, I have a commercial NET dll computing nonlinear regression coefficients and their sigma values. However, I would like to compute the...

• Replies: 0
• Views: 3,628
03-10-2011, 08:11 PM
31. ### Proc model

I am now learning sas from the scratch. well, with Proc model procedure I want to get residuals, predicted values and possibly studentized...

• Replies: 0
• Views: 3,800
03-11-2011, 12:09 PM
32. ### Linear regression, nonlinear regression or something else?

Hi! I do apologies in advance for any misuse of terms or the lack of understanding in statistics - as I've only realised, after Googling for hours,...

• Replies: 0
• Views: 3,608
03-16-2011, 10:56 PM
33. ### logistic regression results

dear all, I've been using the logistic regression for my data. Let's just say I'm predicting the possibility of A or B. I use four predictors, one...

• Replies: 0
• Views: 1,951
03-17-2011, 06:38 AM
34. ### Spanning test with short sales constraints - how does it works?

Dear all, I need to perform a spanning test with short sales constraint to assess the diversification potential of microfinancial assets. I red...

• Replies: 0
• Views: 2,952
03-21-2011, 01:55 PM
35. ### Need Help Choosing a Textbook

Hi, I'm looking for a textbook/book to let me self-study regression analysis. Some background: I have a research psych background...

• Replies: 0
• Views: 1,832
03-23-2011, 10:13 AM
36. ### Regression analysis for a cross sectional study

Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

• Replies: 0
• Views: 5,626
03-24-2011, 12:14 AM
37. ### Logistic regression question

Hi everyone, I have a question regarding an exercise on Gujarati's "Basic Econometrics" (exercise 15.2 p.625 4th edition). In this exercise we are...

• Replies: 0
• Views: 2,124
03-25-2011, 05:47 AM
38. ### Robust regression

Hi, I am trying to use robust regression instead of ordinary least squares since my data set has a lot of outliers but I don't know if I have...

• Replies: 0
• Views: 4,159
03-28-2011, 09:18 PM
39. ### Ordinal regression vs Linear regression

Here's the situation: I have a categorical dependent variable (3 categories), and 3 continuous explanatory variables. Say I perform an ordinal...

• Replies: 0
• Views: 4,259
03-29-2011, 02:02 AM
40. ### what does the parameter a and b mean?

I have worked out the regression equation Y= 12559.7477 + 4265.7566X What does 12559.7477 and 4265.7566X mean? Is 12559.7477 the y-intercept...

• Replies: 0
• Views: 2,329
03-29-2011, 04:54 AM

I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

• Replies: 0
• Views: 2,638
03-30-2011, 10:36 AM

Hey everyone, Does anyone know the steps that minitab or any other stats software does to eliminate variables when doing forward selection,...

• Replies: 0
• Views: 3,310
04-01-2011, 05:37 PM
43. ### Help with repeated measures analyses

Hi everyone It is my first posting in this forum so hope I am not asking something that has been answered lots. I am trying to analyses a...

• Replies: 0
• Views: 2,167
04-03-2011, 03:08 AM
44. ### Generalized Cross Validation

Hello Guys, I'm runing MATLAB code on SVD with roughness penalties. When I use GCV to choose the parameter, I have a question regarding the...

• Replies: 0
• Views: 3,299
04-05-2011, 08:04 AM
45. ### Repeat sales regression help

Hello everyone, I am in need of any help or guidance working on a repeat sales regression using spss. I am doing a repeat sales index on housing...

• Replies: 0
• Views: 4,865
04-05-2011, 04:36 PM
46. ### Mean Squared Prediction Error?

Hi, I am having trouble understanding how to use MSPE. Let's say I have 30 data points and then a sample of 4 of them is selected (the 'test...

• Replies: 0
• Views: 3,714
04-12-2011, 10:50 AM
47. ### Discrete regression

What is the/an appropriate regression technique to use where the dependent variables are discrete labels. For example, I have predicted survival...

• Replies: 0
• Views: 2,407
04-12-2011, 11:59 AM
48. ### Johansen Cointegration test issue

Hello, Let me describe the issue: I have a vector of four time series, each component of which is I(1). When I put the four series into a matrix...

• Replies: 0
• Views: 2,263
04-14-2011, 05:00 PM
49. ### Time series or just repeated measures?

Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most...

• Replies: 0
• Views: 2,972
04-14-2011, 09:14 PM
50. ### working correlation matrix to use in generalized estimating equations

I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

• Replies: 0
• Views: 3,636
Yue
04-15-2011, 02:41 PM
51. ### Interaction Between Quadratic Variables in Logistic Regression

Hi, I got some questions about assumption and interpretation of conditional logistic regression. It seems that two of my variables (let says N and...

• Replies: 0
• Views: 3,369
STG
04-18-2011, 07:42 AM
52. ### Error Propagation in Multivariable Regression

I've spent all day reading Matlab tutorials and can't seem to find anything about propagating error in regression analysis. I have a set of x and y...

• Replies: 0
• Views: 2,973
04-20-2011, 05:41 PM
53. ### Choosing the Best Regression Model

I have been asked to build a predictive model of a population based on cost. The sample size of the population is 30k for the current test (with data...

• Replies: 0
• Views: 3,670
JAH
04-22-2011, 03:48 PM
54. ### 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: 1,709
04-23-2011, 03:32 AM
55. ### 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: 2,841
04-29-2011, 05:18 AM

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