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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Weight Matrix in Generalised Linear Models

Hi, I was wondering if I am trying to do IRLS for GLZ. Is there a way to compute the weight matrix directly for the data I have? I think its...

• Replies: 0
• Views: 1,035
04-25-2012, 09:31 AM
2. ### multiple linear regression

hey guys, i want to ask if anyone has came across any statistical test that have attemted to rank independent variables in their other of...

• Replies: 0
• Views: 1,382
04-24-2012, 10:08 AM
3. ### Really stuck with moderated regression...

I have used a hierarchical regression analysis in SPSS, however the analysis isn't producing any significant interactions :confused: The...

• Replies: 4
• Views: 2,084
04-24-2012, 09:29 AM
4. ### T-test for 2 slopes

Is there a t-test that I can use to show that my two slopes are on different planes, or that they are different? ...

• Replies: 0
• Views: 2,283
04-23-2012, 03:25 PM
5. ### Appropriate null hypothesis for a two-stage regression

Hi – thanks everyone for your help in advance. I’m working on a two-stage regression, in which a coefficient from the first regression is used as an...

• Replies: 0
• Views: 1,329
04-23-2012, 08:25 AM
6. ### 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: 5,724
04-23-2012, 04:55 AM
7. ### Simple minitab result interpretation ?

I've lost most of my lecture notes and am having trouble recalling the formulae for various results, it would be appreciated if you could please help...

• Replies: 0
• Views: 1,709
04-21-2012, 03:43 PM
8. ### Systematic way of finding all linear relations between given set of variables?

Hello! I'm a newcomer to statistics and data analysis and I'm currently facing a problem which I don't know how to solve. I have a dataset with...

• Replies: 0
• Views: 1,478
04-21-2012, 04:04 AM
9. ### 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: 2,624
04-21-2012, 03:07 AM
10. ### Help me choose a regression model?

Hi everyone, I have the following problem in mind: Suppose m items are displayed to a user and the user can buy any one of them. Each of the items...

• Replies: 2
• Views: 1,697
04-20-2012, 08:17 PM
11. ### Seemingly Unrelated Regression vs Maximum Likelihood ~ best for constraints?

I am currently doing research and I am utilizing an almost ideal demand system. It is essentially a regression equation that seeks to model consumer...

• Replies: 0
• Views: 1,529
04-20-2012, 03:10 AM
12. ### Help! my model isn't predicting any yes outcomes and don't know why

I am producing a logistical regression analysis to find a model to predict whether someone has minor mental health problems or not. I'm almost...

• Replies: 9
• Views: 1,952
04-20-2012, 02:57 AM
13. ### Combining regression with time series

Using an existing time series of supermarket sales data I need to make a forecast. Basically a simple exponential smoothing model explains future...

• Replies: 2
• Views: 5,265
04-19-2012, 05:59 AM
14. ### Testing a learning curve

Hi all, Suppose someone kicks a football at a goal. However, I want to test to see whether or not practice improves technique - whether there is a...

• Replies: 0
• Views: 1,602
04-18-2012, 04:25 AM
15. ### Log Transform and Nonpositive Values

I know that some researchers, when taking the log of a variable with some nonpositive values (like wealth), simply replace the nonpositive values...

• Replies: 0
• Views: 1,455
04-17-2012, 01:40 PM
16. ### How to test significance of the mean of multiple OLS regressions (Jensen's Alpha).

Hi. Im working on a paper on mutual fund performance, using Jensen's Alpha to measure performance. Ri-Rf=a+b(Rm-rf)+ei Time series regression,...

• Replies: 1
• Views: 4,028
04-17-2012, 06:23 AM
17. ### Regressing survey data with independent variables and external data as dependent

I have an SPSS file with longitudinal data, stretching back 18 months or so (monthly survey with around n=1000), so the survey month is one of the...

• Replies: 0
• Views: 1,746
04-16-2012, 09:18 PM
18. ### Panel Data Regression with Few Observations

Hello! I know very little of statistics but I need help to do my thesis. I'm running a regression with fixed and random effects in a panel data of 5...

• Replies: 0
• Views: 2,682
04-16-2012, 05:57 PM
19. ### Panel data regression time fixed & firm fixed

Hi all, After desparately searching the web and the library I hope one of you will be able to help me with my spss (no 19) problem. My data set...

• Replies: 0
• Views: 1,676
04-15-2012, 02:29 AM
20. ### When Logistic Regression Coefficient Increases

Hi All, I am trying to understand the relationship between naturalization (whether someone becomes a naturalized citizen or not), using data from...

• Replies: 1
• Views: 2,047
04-12-2012, 02:17 PM
21. ### Logistic regression significant interaction with categorical predictor

Hello everyone, I am doing a binary logistic regression and a have some questions about presenting my data. Depedent variable: Extensive rot...

• Replies: 0
• Views: 1,582
04-11-2012, 05:10 PM
22. ### disputing a fixed effects model assumption

Hi guys, I'm in the middle of responding to a reviewer's claim on fixed effects models and wanted to reach out to see if any of you had any...

• Replies: 0
• Views: 1,346
04-11-2012, 12:29 PM
23. ### multiple timeseries in regression ?

Hi, has anyone ever done multiple time series in a regression model.. So for example if I have 3 different regions (Prov) each with 10 sub-regions...

• Replies: 0
• Views: 1,602
04-11-2012, 09:30 AM
24. ### Pooled OLS

I've got a question concerning a regression analysis which I'm about to perform. The dataset contains pupils from six different years in a...

• Replies: 0
• Views: 3,418
04-11-2012, 03:49 AM
25. ### How to do a industry comparison?

Hello everyone, I am really new to statistical analysis and Stata so I might have a question which could sound too dumb, but I still hope that...

• Replies: 1
• Views: 1,528
04-10-2012, 04:44 PM

Hi All, I am running regression on panel data with 6 time periods and around 160 countries. I have been trying different combinations, but get...

• Replies: 1
• Views: 1,794
04-09-2012, 07:43 AM
27. ### LinReg Assumption on errors ConfIV

Hi all why is it assumed that the errors e_i are normal distributed in linear regression, see e.g. Seber. What would be the influence e.g. on...

• Replies: 4
• Views: 2,081
04-09-2012, 05:17 AM
28. ### Multilevel model of school data

Hi, I have a model I am working with to estimate 6 grade test scores from a sample of students who were in a school district from K-6. I am using...

• Replies: 4
• Views: 1,658
04-06-2012, 07:17 PM
29. ### Single Negative Beta in Multiple Linear Regression

Hi everyone I'm having trouble interpreting a single negative regression coefficient in a multiple linear regression. The situation is as follows:...

• Replies: 1
• Views: 6,068
04-05-2012, 03:57 AM
30. ### Ordered Logit - Probabilities and quadratic term

Hi everyone, I'm running into a problem interpreting a quadratic (curvilinear) relationship using an ordered logit model. the d.v. is self...

• Replies: 0
• Views: 3,731
04-04-2012, 04:03 PM
31. ### Logistic regression convergence issues

Hi Folks! I'm using logistic regression for classifying records into groups. The issue with logistic regression is that if any cell in the...

• Replies: 8
• Views: 6,564
04-04-2012, 01:12 PM
32. ### Moderation in Logistic Regression

Hi, looking at all the other topics, this is a very basic question, but for me it is really a brain cracker.. I have a conceptual model; ...

• Replies: 9
• Views: 23,967
04-04-2012, 05:36 AM
33. ### Problems with within subjects regression and dummy variables

I'm hoping someone will be able to help me with this. I'm trying to replicate some analysis that was done in a published paper to see if I get the...

• Replies: 0
• Views: 2,261
04-04-2012, 03:27 AM
34. ### Help with mixed models (spss, time-invariant main predictor, not a growth model)

I have practically no experience with longitudinal data, and really need your help. I am looking at a sample of firms in a certain industry, and...

• Replies: 0
• Views: 2,284
04-03-2012, 06:25 AM
35. ### 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: 1,956
04-02-2012, 01:58 PM
36. ### Assistance on Analysing Likert scale data

Hi all, I'm looking for some advice on data analysis. I can't see the wood for the trees now at this stage. I'm doing a study of the effect of...

• Replies: 0
• Views: 1,643
04-02-2012, 10:00 AM
37. ### 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: 16,336
04-01-2012, 02:13 PM
38. ### simulating bias in fixed-effect dummy regressions

Earlier today I was typing up a reply to this thread (LINK), but since I don't have a lot of experience with so-called fixed-effects dummy regression...

• Replies: 0
• Views: 3,039
03-31-2012, 08:30 PM
39. ### 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: 2,879
03-31-2012, 10:22 AM
40. ### Greatest impact prediction

Hi, please i have one Question. If i have this results (Stepwise method) Can i say: 1) Better for predict Y is model 4 2) Regression...

• Replies: 1
• Views: 1,256
03-31-2012, 12:39 AM
41. ### 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: 2,740
03-30-2012, 02:46 PM
42. ### Linear regression vs ancova - when to use which

Hi all, I have some data on species richness, latitude and temperature. In the past on this sort of data I have used multi-linear regression. But it...

• Replies: 1
• Views: 3,281
03-29-2012, 07:11 PM
43. ### Derivation of the lack of fit sum of suares

Hi, Can anyone show me step by step how to derive the lack of fit sum of squares, I would be very thankful, I'm so lost in this. Thank you.

• Replies: 1
• Views: 1,803
03-29-2012, 12:05 PM
44. ### (Beginner!) Questions about regression on CD album sales/internet use/digital music s

Hello, I am attempting to perform a regression on what has caused the reduction in CD album sales, and need a little assistance. I have 28 data...

• Replies: 1
• Views: 1,879
03-29-2012, 09:34 AM
45. ### Comparing curves fitted to two quadratic regressions

Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

• Replies: 2
• Views: 4,021
03-28-2012, 07:30 PM
46. ### Which regression should I use?????? HELP

I have a questionnaire with where respondents were asked if they remember seeing a TV commercial, a radio commercial and a magazine add. “Yes or no...

• Replies: 2
• Views: 2,128
03-28-2012, 04:20 PM
47. ### Heckman model

Hi, I'm running a heckman model however some issues have arisen: 1. The log likelihood function is not concave and does not converge after a...

• Replies: 0
• Views: 2,327
03-28-2012, 04:11 PM
48. ### a question about estimates in mixed models

Hello, I was hoping to be able to find all of the estimates of covariates and of the categories with a number of factors. I found a similar study...

• Replies: 0
• Views: 1,219
03-28-2012, 12:55 AM
49. ### Interaction effect: Do the single variables both need to be significant?

Dear all, If you have a regression model Y=b0+b1*A+b2*B+b3*A*B, and the dependent variable A and the interaction effect A*B have significant...

• Replies: 2
• Views: 1,964
03-26-2012, 06:22 PM
50. ### Determining weighting factors from linear regression

Hi, I am working on a digital filtering project where I am trying to optimize a filter for a Doppler ultrasound application. Without going in to...

• Replies: 0
• Views: 2,949
03-26-2012, 06:20 PM
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: 2,725
03-26-2012, 10:55 AM
52. ### Significant Effects after Including Interaction Variable (?) :confused:

Dear all, I hope you could help me with the following: I have tested two regression models, one with inependent variable A, B, C, D, E and one...

• Replies: 0
• Views: 1,361
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03-26-2012, 08:57 AM

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