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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Methodology design: "Which stocks fall first" & "Which stocks fall the most"

Hi guys, I'm looking at an event study of 500 stocks. The event is a financial crisis, where I expect most stocks to fall over the window. I have...

• Replies: 0
• Views: 1,395
07-25-2012, 11:01 AM
2. ### Finding complex relationships with multiple independent variables

Howdy. Question - how can I find complex relationships when there are multiple independent variables. Specifically, I am looking at a situation where...

• Replies: 1
• Views: 2,112
07-25-2012, 10:45 AM
3. ### logistic regression, problems with missing values

Hi all, I am new to logistic regression, so please forgive me if this question sounds stupid... I am doing an logistic regression on a Likert item...

• Replies: 1
• Views: 1,725
07-25-2012, 09:12 AM
4. ### Testing arbitrary contrasts based on summary statistics

Following the discussion in this recent thread (Getting F statistic from multiple t-statistics?) and spunky's request therein, here is a neat trick...

• Replies: 3
• Views: 3,323
07-24-2012, 07:55 PM
5. ### Poynomial Regression through the origin

I am trying to program in SQL a polynomial regression of degree two with a zero intercept. I can't seem to find the appropriate literature on this...

• Replies: 8
• Views: 4,218
07-24-2012, 05:50 PM
6. ### Holt-Winter forecasting for many future events

Hello, I have been investigating and testing forecasting methods for incoming call volumes. I have many months of data. The data exhibits a...

• Replies: 0
• Views: 2,383
07-24-2012, 10:25 AM
7. ### Autocorrelation Remedy Help

For my bachelor thesis I need to regress historical stock price with earning per share. My data consist of eleven years period with yearly...

• Replies: 1
• Views: 1,942
07-24-2012, 07:30 AM
8. ### logistic regression - model selection

I am a bit confused in model selection for logistic regression using SPSS I have done univariant tests (Chi square etc) and selected variables...

• Replies: 0
• Views: 1,484
07-24-2012, 04:28 AM
9. ### Getting F statistic from multiple t-statistics?

If I have Y = a + b1*X1 + b2*X2 + b3*X3 + error, and I have calculated sample t-statistics for b1 and b2, from this information (along with...

• Replies: 7
• Views: 2,824
07-24-2012, 03:24 AM
10. ### How do I apply the bonferroni correction in hierarchical regression?

I am conducting a hierarchical multiple regression with 6 predictor variables (2 dichotomous, 1 continuous, 3 2-way interactions) entered over 4...

• Replies: 0
• Views: 3,089
07-23-2012, 11:42 PM
11. ### Multiple regression- kurtosis in DV

Hey all, This may be a really stupid question. But I'm really stupid when it comes to statistics, so bear with me! My dependent variable has...

• Replies: 4
• Views: 2,451
07-23-2012, 09:44 PM
12. ### CARs from small sample(26): Which Regression is the best to perform?

Dear All, I am new to this forum, but I am trying to become more and more specified in statistics for my Master Thesis (Erasmus University...

• Replies: 5
• Views: 3,422
07-23-2012, 02:13 PM
13. ### A big problem: Portfolio OLS t-statistic calculation and other P-OLS issues.

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• Replies: 0
• Views: 1,629
07-23-2012, 12:52 PM
14. ### calculating sample size needed by future studies having got my Logistic Regression

Help anyone? I have downloaded Gpower 3, and seemingly found the option: under test family: z tests statistical test: logistic regression ...

• Replies: 11
• Views: 6,183
07-23-2012, 08:59 AM
15. ### Sample size of Categorical Variables

Hi, I'm running a binary logistic model that includes categorical variables. One of my main covariates has 8 categories and some of the sample...

• Replies: 6
• Views: 8,031
07-23-2012, 08:17 AM
16. ### Z-scores in Neg. Binomial Regression

Hi I'm running a negative binomial regression model for some count data and did a Tukey's HSD range test to compare the different factors. When I...

• Replies: 2
• Views: 2,580
07-23-2012, 02:25 AM
17. ### Fixed effects versus random effects problem

Hello everybody, I have a panel, and for simplicity lets say I want to find the correlation between x and y. Unfortunately, the x and the y for...

• Replies: 2
• Views: 1,689
07-22-2012, 09:28 AM
18. ### Calculating R^2: to use or not use the least-squares line

Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare two types of...

• Replies: 8
• Views: 1,597
07-21-2012, 05:37 PM
19. ### Logistic Regression Question

Hi everyone, I have just found this forum (via google) and I wish I had known about it earlier, it seems great! My knowledge of statistics is sadly...

• Replies: 4
• Views: 1,456
07-21-2012, 04:49 PM
20. ### need to convert back from log transformation?

I'm a beginner and would appreciate any help. I've made a multivariate regression model which predicts the natural log of energy consumption. I'm...

• Replies: 1
• Views: 1,565
07-21-2012, 02:40 PM
21. ### Cook's Distance on WLS?

I am working with clustered data in R and am running a weighted least squares regression, weighting based on the number of elementary units in the...

• Replies: 0
• Views: 1,480
07-20-2012, 03:11 PM
22. ### too many dummy variables

Hello I have a categorical independent variable, with 11 levels...so I need 10 dummy variables. I wanted to ask how can I analyze 10 dummy...

• Replies: 10
• Views: 7,478
07-20-2012, 02:55 AM
23. ### reporting descriptive Stats when using gender in multiple regression.

Hi, I am relatively new to research methods and using SPSS. I wanted to perform multiple regression analysis using categorical and continuous...

• Replies: 6
• Views: 4,369
07-19-2012, 02:39 PM
24. ### regression analysis fro x>0 and values close to 0

Hi there, I am performing multilinear regression analysis of a response variable that: - takes only positive or zero values - comprises...

• Replies: 3
• Views: 1,369
07-19-2012, 11:30 AM
25. ### moderated multiple regression with dummy variables

Hello, As part of final revisions for my dissertation, I need to resolve an issue in my analyses. I am running a moderated multiple...

• Replies: 3
• Views: 4,633
07-18-2012, 07:11 PM
26. ### Parameter estimation - which method?

I am new to parameter estimation. It is not clear for me which method is the best to use to estimate parameter of my model: my statistical model has...

• Replies: 14
• Views: 4,172
07-18-2012, 04:06 AM
27. ### [Violation] Hosmer & Lemeshow - Binary Logistics Regression

I want to analyze some factors which contribute to smoking behavior in teenager and young adult. These are my variables: y = smoking status...

• Replies: 5
• Views: 2,616
07-17-2012, 07:05 PM
28. ### Comparing regression coefficients - dependent samples

Hi, I used two methods (A and B) to obtain measurements in a group of subjects. The methods (ways of measuring) are different, but they should...

• Replies: 2
• Views: 1,926
07-17-2012, 07:07 AM
29. ### (OLS) How to get sample variance-covariance matrix of residuals?

Consider the OLS: (1) y = a + b*x + e Where e is the error term. I understand that the population variance-covariance matrix for the residuals...

• Replies: 6
• Views: 4,976
07-16-2012, 10:02 AM
30. ### Do these dummy variables cancel clustered heteroscedasticity?

Hi, I have the cross-sectional: Stock returns_i = a_i + b_i * X_i + error. Here, X_i is an independent variable and "Stock returns" is, say,...

• Replies: 0
• Views: 1,499
07-15-2012, 08:15 AM
31. ### What do I use here? Pooled OLS??

Hi, say I have 10 vectors of stock returns (so a matrix with dimensions Tx10), and I have the return on the market as the independent variable (so a...

• Replies: 2
• Views: 2,812
07-14-2012, 10:42 PM
32. ### Transformation of variables

Hello, I have a regression problem I do not know how to approach. I have a regression line: y=4+5x a linear transformation is being done: ...

• Replies: 5
• Views: 1,605
07-14-2012, 03:17 PM

Hi, I´m trying to run a series of regressions using Gretl. I will use OLS, 2SLS and system-GMM dynamic panel estimator. However there is something...

• Replies: 3
• Views: 2,853
07-13-2012, 05:01 PM
34. ### moving average term in autocorrelation

Can anyone say whether it is appropriate to add a moving average term when dealing with auto correlation? Is it a good practice?

• Replies: 1
• Views: 1,471
07-13-2012, 03:25 PM
35. ### Simple regression but still I have a question

Dear all, If I perform a simple regression in which I regress a dependent variable on time (to look at the effect of a year on the dependent...

• Replies: 1
• Views: 1,556
07-13-2012, 09:31 AM
36. ### Problem with forecasting/data transformation

Hi, I am looking to forecast ticket sales (the distribution is U shaped with big tails, i.e. a lot of sales happens during the first few days and...

• Replies: 4
• Views: 1,715
07-13-2012, 08:06 AM
37. ### principle component

Dear All, Below is an output from a research that analyse human characteristics for the sale representitatives x's are properties of characteristics...

• Replies: 0
• Views: 1,346
07-13-2012, 07:41 AM
38. ### Help with Regression Analysis problem and time delay

Good morning all! I am presently working on a paper, and am grappling with a statistical problem that is outside of my area of expertise (I am...

• Replies: 3
• Views: 2,495
07-13-2012, 04:45 AM
39. ### Regression analysis sample size problem

Hi there, Could anybody offer any advice on a linear regression sample size problem? I am using regression to predict the energy consumption...

• Replies: 1
• Views: 4,055
07-13-2012, 02:52 AM
40. ### What is wrong with my reg calc ?

Hello, this is my data X | Y -1.41421 | 1.55662 -0.70711 | 0.07412 0.00000 | 0.44475 0.00000 | -0.29650 0.70711 | -0.29650...

• Replies: 3
• Views: 2,055
07-12-2012, 04:13 PM
41. ### zero-inflated count data

I want to do a regression where both the response and an explanatory variable are zero-inflated counts. It's fairly straightforward to do a ZIP...

• Replies: 1
• Views: 1,736
07-11-2012, 05:35 PM
42. ### Multivariate Regression - Percent Contribution to R^2

I'm running a multivariate regression in Stata 12 SE that regresses six different groups of independent variables onto my dependent. Each group has a...

• Replies: 1
• Views: 2,083
07-10-2012, 02:30 PM
43. ### Deleting unhelpful observations from model?

Hi, I'm using panel data on the sales of various products to estimate price elasticities, which basically means running a regression model that...

• Replies: 0
• Views: 1,232
07-10-2012, 11:28 AM
44. ### multi group SEM regression coefficient/t-value interpretation

Hello, I have a small interpretation issue. A chi-square difference test between unconstrained vs constrained multi group sem indicated...

• Replies: 1
• Views: 2,634
07-10-2012, 06:58 AM
45. ### Regression Hypothesis

I am not good at statistics that is why I am seeking help in this forum. Thanks for any help in advance. My research hypothesis is Student will...

• Replies: 1
• Views: 1,472
07-09-2012, 07:26 PM
46. ### Assessing model fit

I have built two logistric regression models: one forced entry model that features some highly insignificant variables, and a stepwise one that,...

• Replies: 1
• Views: 1,567
07-09-2012, 12:48 PM
47. ### Comparing regression slope intercepts in SPSS

Hello, my name is Robert Hall and I have got myself in a bit of a pickle with my 3rd year research project. For my project I am looking at the...

• Replies: 4
• Views: 16,065
Jac
07-09-2012, 11:39 AM
48. ### Distribution of error term in lognormal maximum likelihood estimation

Hi I have performed a maximum likelihood estimation of a linear function y=B0+B1X+E, where Y is a lognormally-distributed dependent variable, B0 and...

• Replies: 1
• Views: 2,147
07-09-2012, 08:47 AM
49. ### regression with categorical and scale IVs

Hey, guys, i need some help on this project im working on. I am trying to perform a regression where the dependent variable is scale, while the IVs...

• Replies: 2
• Views: 1,626
07-07-2012, 06:55 AM
50. ### which type of GLM Poisson or Negative Binomial or am I way off?

With some gracious nudges and encouragement from CowboyBear and GretaGarbo I am doing my best to learn GLM regression. As I noted in an earlier...

• Replies: 0
• Views: 1,091
07-06-2012, 04:15 PM
51. ### missing price datas before launched

HI, I have the price and volume data from own product and competitor's product: Year_Month Volume own product's price Volume ...

• Replies: 1
• Views: 1,549
07-06-2012, 11:10 AM
52. ### natural log of DV [or not?] in OLS regression? and collinearity questions for IVs

First I want to thank anyone who responds in advance. I'm grateful for any teaching I can get. Secondly, I'm math challenged. And my stats...

• Replies: 7
• Views: 4,646
07-05-2012, 10:26 PM
53. ### Hierarchical Regression for Interactions - WHY? (theory question)

Hi all, I have a theoretical question about hierarchical regression for interactions. Simply, why is it better to use hierarchical regression...

• Replies: 0
• Views: 2,882
07-05-2012, 08:58 AM
54. ### parametric and non parametric data

Hi I am new to stats, so maybe a silly question. Does regression analysis have assumptions of normality? Can I use regression for both normally...

• Replies: 2
• Views: 1,901
07-05-2012, 12:28 AM
55. ### Regression on coordinates

Hello everyone, I plan to include coordinates as covariates in the regression equation in order to adjust for the spatial trend that exists in the...

• Replies: 0
• Views: 2,354
07-04-2012, 08:01 PM

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