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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### GLMM random effect conceptualization

Hello, I have a general question concerning GLMM. I would like to model animal counts as a function of characteristics of the sampling location and...

• Replies: 0
• Views: 1,733
05-14-2012, 08:13 AM
2. ### Regression with two categorical predictors and 1 control/covariate?

Hello, I'm in need of help as these analyses I describe are for my thesis so any input would be greatly appreciated. By the way, I am using IBM...

• Replies: 1
• Views: 2,485
05-14-2012, 03:04 AM
3. ### Calculating Cook's Critical Value

Hey can someone show me how to get F (4,15) (0.5) = 0.8783.

• Replies: 7
• Views: 5,538
05-12-2012, 01:37 PM
4. ### Insignificant coefficient in one model becomes significant in another model--???

Aloha, A multiple regression finding is puzzling my adviser and I. Overall goal--to see if caregiver status (dummy, 0/1) and job variables...

• Replies: 3
• Views: 10,362
05-10-2012, 07:21 PM
5. ### Linear R^2 Values as Percent Weights for Multiple Variable Formula?

Hey guys, Statistics is not my strong suit.. The closest I've been to statistics is a college level Biology II class I took three years ago.. But...

• Replies: 1
• Views: 2,829
05-10-2012, 06:12 PM
6. ### Beginner's Question

Given that you have all the data you need in excel, how fast does it take to derive the equation of the line with it's r2 value? lets say you use...

• Replies: 0
• Views: 1,425
05-10-2012, 06:07 PM
7. ### Significant Correlation, Insignificant Regression

Dear All, I have a highly significant correlation between two variables (A and B). When using a OLS method, however, the relationship between the...

• Replies: 1
• Views: 3,788
05-10-2012, 06:06 PM
8. ### What tools can we use to solve LR equations to get unknown parameter vector?

Greetings, Apologies if my explanations are unclear, I am new to data mining coming from business intelligence development area. Let's say we...

• Replies: 4
• Views: 1,951
05-10-2012, 01:16 PM
9. ### Squared semi partial correlations

Hi I have been developing multiple regression models with 2 predictors. The two predictors are slightly correlated and therefore I am wanting to...

• Replies: 2
• Views: 2,788
05-08-2012, 06:53 AM
10. ### Regression Analysis on cluster of data

I'm currently a student trying to analyze the relation between the cost of marketing and it's observed returns on those costs. obviously, the...

• Replies: 3
• Views: 2,299
05-06-2012, 04:09 PM
11. ### cut-off point for binary logistic regression without ROC curve

Hi! I just want to know how to find a relatively good cut-off point for binary logistic regression model. I haven't learnt anything on ROC curve. Is...

• Replies: 0
• Views: 6,131
05-06-2012, 11:29 AM
12. ### which model to use ?

Hello I have a problem choosing the right model for my data. My response variable is time to event in minutes, when a lower value is better...

• Replies: 3
• Views: 2,391
05-04-2012, 02:02 PM
13. ### Alternatives to Poisson regression for overdispersed count data

Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

• Replies: 6
• Views: 2,505
05-04-2012, 11:52 AM
14. ### relative risk ratios and standard errors

Hey forum, Odds ratios or relative risk ratios are calculated by exponentiating the coefficients (from a binary or multinomial logit model),...

• Replies: 2
• Views: 2,962
05-04-2012, 08:17 AM
15. ### Timeseries: sig. Ljung-box Q, but residuals normally distributed

Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

• Replies: 4
• Views: 7,898
05-03-2012, 12:15 PM
16. ### Logistic Regression

I have a sample of 500 older kids and we want to investigate what factors are related to the probability that they will bully. Groups: kids were...

• Replies: 3
• Views: 2,408
05-02-2012, 09:09 AM
17. ### Observation limitation

I am currently doing my dissertation on how China's economic growth contributes to Hong Kong's income inequality after 1997. However, there are only...

• Replies: 0
• Views: 1,833
05-02-2012, 08:31 AM
18. ### multiple regression and mediators

Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

• Replies: 4
• Views: 4,109
05-02-2012, 05:57 AM
19. ### Predictors in Logistic regression, SPSS

Hello. I have the problem I can’t deal with. Maybe you can help me? You see, I have 2 samples in retrospective cohort study – cases (include 29...

• Replies: 3
• Views: 3,692
05-01-2012, 02:08 PM
20. ### Difference in Differences (DID) - control group question

Hi, I am considering doing the following and I am wondering whether it makes statistical sense. I am interested in comparing the time spent...

• Replies: 0
• Views: 1,179
05-01-2012, 12:35 PM
21. ### Simple Question (Multiple Regression)

Hi Guys and Gals! I am performing linear regression with interaction terms. I also wish to test these variables separately, so predictor1...

• Replies: 1
• Views: 1,918
05-01-2012, 09:05 AM
22. ### Identifying significant covariates

Hello, I've been asked to identify covariates based on significant associations b/w covariates and the IV as well as the DV. I've never done this...

• Replies: 0
• Views: 2,863
05-01-2012, 08:45 AM
23. ### 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: 4,885
05-01-2012, 02:46 AM
24. ### Regression Coefficients & Chi Squared test

I am finding it difficult to understand something I found in a textbook. The author runs a regression of the specification Y = a + bX, on the basis...

• Replies: 0
• Views: 1,648
05-01-2012, 01:21 AM
25. ### Incremental poisson/logistic regression

Is anyone aware of any work on incremental poisson or logistic regression, i.e. where training data arrives one sample at a time, the samples are not...

• Replies: 0
• Views: 1,402
04-30-2012, 03:14 PM
26. ### Creating an indicator variable of a single observation

Hello, Could somebody explain the rational for creating a dummy variable for a single observation in a regression analysis. Why would you do it? ...

• Replies: 0
• Views: 2,057
04-29-2012, 06:26 AM
27. ### Binary logistic regression to analyze Likert Scale questionnaire

Hi, I am sort of stuck with the following problem concerning logistic regression analysis in my research on the determinants of technology...

• Replies: 0
• Views: 4,172
04-28-2012, 12:24 PM
28. ### Blinder-Oaxaca Decomposition for a Multivariate Linear Regression

Hello Everyone, I am working on a thesis that uses a multivariate linear regression to evaluate the racial wealth gap between four groups: whites,...

• Replies: 1
• Views: 5,637
04-28-2012, 11:36 AM
29. ### F-Test Interpretation and Log-Linear?

Hey. I have found this a very difficult subject to self-teach and unfortunately I have not found my teachers particularly helpful. Sorry about the...

• Replies: 9
• Views: 4,479
Jak
04-27-2012, 01:40 PM
30. ### Dummy variable question in regression

Hello, I'm trying to understand dummy variables in regression. I'm regressing the price of diamonds against (1) weight (2) Clarity and (3)...

• Replies: 2
• Views: 2,163
04-26-2012, 11:26 AM
31. ### OLS regression versus Binary regression

Hello, I am currently working on my master thesis and I have a question regarding the use of two types of regressions. First, I will explain the...

• Replies: 1
• Views: 2,120
04-26-2012, 05:29 AM

Hello! Before I start the whole story, I am going to sumamrize my main question beforehand so the story will hopefully make more sense. Mainly,...

• Replies: 0
• Views: 2,113
04-25-2012, 02:01 PM
33. ### 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: 1,127
04-25-2012, 09:31 AM
34. ### 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: 1,507
04-24-2012, 10:08 AM
35. ### 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: 2,634
04-24-2012, 09:29 AM
36. ### 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: 3,117
04-23-2012, 03:25 PM
37. ### 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: 1,493
04-23-2012, 08:25 AM
38. ### 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: 6,117
04-23-2012, 04:55 AM
39. ### 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: 1,893
04-21-2012, 03:43 PM
40. ### 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: 1,591
04-21-2012, 04:04 AM
41. ### 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: 3,130
04-21-2012, 03:07 AM
42. ### 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: 1,849
04-20-2012, 08:17 PM
43. ### 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: 1,770
04-20-2012, 03:10 AM
44. ### 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: 2,131
04-20-2012, 02:57 AM
45. ### 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: 5,876
04-19-2012, 05:59 AM
46. ### 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: 1,775
04-18-2012, 04:25 AM
47. ### 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: 1,616
04-17-2012, 01:40 PM
48. ### 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: 4,388
04-17-2012, 06:23 AM
49. ### 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: 1,918
04-16-2012, 09:18 PM
50. ### 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: 2,976
04-16-2012, 05:57 PM
51. ### 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: 2,056
04-15-2012, 02:29 AM
52. ### 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: 2,375
04-12-2012, 02:17 PM
53. ### 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: 1,711
04-11-2012, 05:10 PM
54. ### 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: 1,548
04-11-2012, 12:29 PM
55. ### 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: 2,640
04-11-2012, 09:30 AM
56. ### 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: 3,859
04-11-2012, 03:49 AM

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