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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### using partial regression to fix omitted variable bias?

Hi Everybody, I am trying to find the effect of introducing a new variable. That is, I want to run two regressions: y = b0 + b1x1 and y...

• Replies: 0
• Views: 1,373
06-17-2013, 03:35 PM
2. ### Generalised least squares: from regression coefficients to correlation coefficients?

Hi All, I asked this on Stack Exchange, but it seems no-one there knows the answer. I wonder if anyone on talkstats can shed some light on it. For...

• Replies: 0
• Views: 866
06-17-2013, 12:40 PM
3. ### Regression help needed

Hi All, Assuming Congo gets foreign aid from Denmark, Sweden, UK, US and Germany. How do I go about getting the effect of Denmark's aid on Congo....

• Replies: 1
• Views: 1,377
06-17-2013, 12:07 PM
4. ### Linear Discriminant Analysis - Sample size requirements

As general question, Are 70 observations sufficient to design a reliable decision rule for discriminating between two groups, with a Fisher linear...

• Replies: 3
• Views: 3,779
06-16-2013, 12:49 PM
5. ### Nagelkerke and overall hit ratio won't improve in my logistic regression model!

Hi! I have a problem doing my course assignment(with SPSS): I can't find a way to improve the overall hit ratio and Nagelkerke levels even...

• Replies: 7
• Views: 4,139
06-14-2013, 03:31 PM
6. ### Analysing Panel Poisson Coefficients

Hi, I'm running a panel poisson regression with fixed effects in Stata. The result in Stata doesn't display a constant. Normally I use standard...

• Replies: 0
• Views: 1,572
06-14-2013, 10:05 AM
7. ### How to get rid of market fluctuation? Should I?

I am a finance student, but my real love is statistics... so I am trying to spend this summer working with little projects to learn as much as I...

• Replies: 1
• Views: 1,562
06-14-2013, 10:01 AM
8. ### Datasets for Multiple Linear Regression - How To get the Raw Data ?

Hello everyone. kindly need ur help.. where can i get the raw data for multiple linear regression. the data should have : Atleast (5 variable)...

• Replies: 2
• Views: 4,098
06-14-2013, 09:22 AM
9. ### What kind of regression analysis should I use?

Dear All, I would like to conduct a regression analysis on a data set which includes dicrete inputs (Xs). The purpose is to have a regression...

• Replies: 5
• Views: 2,675
06-14-2013, 01:49 AM
10. ### Non linear mixed models

HI Afer a lot of reading I am still confused what is the difference between a linear and non linear mixed model. I would really appreciate if some...

• Replies: 0
• Views: 1,648
06-13-2013, 03:24 AM
11. ### Grouping Categorical Variables in Regression differently in Main vs Interactions

All, I have a very peculiar problem that I am trying to solve. What I mean is, the following is an explanation of the current solution that has...

• Replies: 0
• Views: 1,267
06-13-2013, 12:39 AM
12. ### Predict race outcome off expert predictions of outcome

Hi, I'm new to this forum and found a late 2011 discussion of the relevance of regression analysis of rank outcome interesting. I have used...

• Replies: 4
• Views: 1,833
06-12-2013, 03:05 PM
13. ### what's regression curve?

Dear all, I assessed the utility of the biomarkers to discriminate between two diseases states (infection or no infection) using ROC analysis. I...

• Replies: 1
• Views: 1,201
06-12-2013, 08:14 AM
14. ### Linear Regression while comparing results?

Hi all I am working on a research project for a basic stats course. I'm in the planning phase and could use some pointers to make sure I'm going...

• Replies: 2
• Views: 1,281
06-11-2013, 10:57 PM
15. ### Polynomial regression question

Say you have a linear and quadratic term. Is it possible for the linear term to be not signficant, and the quadratic term be signficant? If so, what...

• Replies: 8
• Views: 3,009
06-11-2013, 11:17 AM
16. ### Logistic Regression

Helo I am faced with a problem which looks to be a clear case of logistic regression. A dependent variable(binary in nature) needs to be...

• Replies: 4
• Views: 2,206
06-10-2013, 12:14 PM
17. ### Control Vairiables in Multiple regression

Hi, I hope someone can help me. I need to run multiple regression with 2 IVs and 1 DV and include a control variables. The control variable is...

• Replies: 12
• Views: 2,493
06-10-2013, 08:34 AM
18. ### Predicting cutoff point of a peak

I have a gaussian bell shaped chromatographic peak in which my 3 closely related impurities are getting separated (In the same peak). There is a...

• Replies: 2
• Views: 1,426
06-07-2013, 12:28 PM
19. ### Help with forecasting

Hi. I have limited experience in statistics. I've tried to read up on textbooks and such but I suspect i'm missing something that someone more...

• Replies: 0
• Views: 1,381
06-07-2013, 04:30 AM
20. ### Moderation Interaction and much more

Dear all, first of all Im new here, just registered. However I read the rules and couldnt really find something which fits my problems since they...

• Replies: 2
• Views: 1,997
06-06-2013, 12:36 PM
21. ### interpretation of logarithmic independent variable?

Hi I have a dependent variable return on assets (%) and a independent variable which is ln(GNI/cap) thus a log transformed variable to the base...

• Replies: 1
• Views: 1,042
06-06-2013, 09:15 AM
22. ### Not Significant Coefficients

I've run a logit regression to estimate the probability of attending high school. I've done this for many years. The thing is that some coefficients...

• Replies: 9
• Views: 2,602
06-05-2013, 11:29 AM
23. ### Binomial Logistic Regression - Predicted Probabilities

Hi. I’m taking my first steps on binomial logistic regression and I was hoping you could help me with some doubts I’m having. My model has a...

• Replies: 9
• Views: 2,165
06-05-2013, 08:38 AM
24. ### Two Time Dummies?

Hey all, I have a question about time dummies. I'm running a regression with country-years. For each country I have observations for the years...

• Replies: 3
• Views: 1,961
06-05-2013, 05:56 AM
25. ### help needed with two groups.

i'm sorry if this is an incredibly stupid question, this is something i've never done before. i'm doing a study which involves asking two groups the...

• Replies: 1
• Views: 1,031
06-04-2013, 08:22 PM
26. ### Regression and Measurement Error

Hi all, I stil have a problem with the regression regarding my thesis. For one variable, The relative net postions of speculators on the future...

• Replies: 0
• Views: 750
06-03-2013, 08:06 AM
27. ### NonLinear Regression

Hello all, I have a pretty general question: Which nonlinear regression is more reliable when you have a small sample of 50 - 70 size one...

• Replies: 6
• Views: 1,589
06-02-2013, 05:13 AM
28. ### Choosing between Binominal, Negative binominal and Poisson regression

Hey guys, can some one explain to me in which situation it is best to use one of these three regressions? And what tests would I need to do in SPSS...

• Replies: 1
• Views: 1,338
06-01-2013, 07:31 PM
29. ### Help with the cross-sectional regression and GMM

Hi, Can someone please help me with this one? I'm trying to run the next multivariate regression: R_t = β_0 + B*F_t + β_L*L_t + e_t where...

• Replies: 0
• Views: 2,107
thd
06-01-2013, 03:09 PM
30. ### Comparing linear regressions - what method to use?

I have a number of measurements of the initial reaction rate of x reactions. Assuming linearity until t = y gives me x linear regressions with...

• Replies: 5
• Views: 1,818
06-01-2013, 09:04 AM
31. ### Regression Analysis to increase operator safety

Hi, First off, I’ve never taken statistics (I have taken a few calculus classes in college, so some of the notation I am coming across is not too...

• Replies: 3
• Views: 1,389
05-31-2013, 06:44 AM
32. ### system of two regressions with one endogenous regressor

Hi Guys, i want to estimate the following model with 2 equations simultaneous, but im not quite sure if im on the right track r = a0 +...

• Replies: 0
• Views: 1,344
05-30-2013, 02:25 PM
33. ### Moderated Multiple Regression Analysis - but with repeated measures too?

Dear stats experts, I have been struggling with a problem the whole day and only found a partial solution so far, which I think is not sufficient...

• Replies: 2
• Views: 3,980
05-30-2013, 01:39 PM
34. ### Predicting the increase of one variable by the height of another variable

Hi everybody, I have the following question: I have two continuous variables (assertiveness & team-identification). I have measured...

• Replies: 1
• Views: 1,666
05-30-2013, 12:07 PM
35. ### Calculation of effect size in Hierarchical regression

Hello there, I have conducted a hierarchical regression with two steps. Statistical significance resulted form the first step, as the second...

• Replies: 3
• Views: 4,199
05-29-2013, 11:02 AM
36. ### Urgent: Help needed with ordinal data

Hey all, So far I mostly worked with quantitative data, but now I have to do an analysis on effects alcohol consumption. Now I got a questionnaire...

• Replies: 1
• Views: 1,701
05-29-2013, 09:44 AM
37. ### best regression for slaughterhouse variable?

I'd like to know how several variables are related to the number of small-scale slaughterhouses at the county level throughout the US. There are...

• Replies: 3
• Views: 1,319
05-28-2013, 04:16 PM
38. ### AIC for models weighted

Have to choose the best fit between different model. model.list <- list (model1 = nls (y ~ (a * exp (b * x)), data = dat, weights = n, start = list...

• Replies: 0
• Views: 1,136
05-28-2013, 10:47 AM
39. ### Help with dummy variable

Hi, I have a set of OLS-fixed effects models comprising continuous and dummy variables, with the latter used as control parameters. My models aim...

• Replies: 1
• Views: 2,207
05-27-2013, 09:25 PM
40. ### Urgent help needed

what sort of anaylsis should I use if I am trying to find the relationship between earthworm densities and soil properties (pH and organic matter...

• Replies: 1
• Views: 1,571
05-27-2013, 12:15 AM
41. ### Interpretation of Binary Logistic regression with confounder

I simplified it a bit so I can get my question across easier Dep variable: Happy(0) or Sad(1) Independent variable: Age Independent V: Sent to...

• Replies: 3
• Views: 1,656
05-26-2013, 05:59 PM
42. ### Interaction terms - lower level isn't significant!

Hi there. I'm running a model with a 3 level interaction which is significant. I included all the two levels interactions which make the basis for...

• Replies: 1
• Views: 1,603
05-26-2013, 11:48 AM
43. ### Should I delete sampling zero points before adjusting a curve

I need to fit a curve (regression and non-parametric smoothing) a set of points. These points represent the prevalence of disease by age. However, as...

• Replies: 0
• Views: 965
05-24-2013, 04:26 PM
44. ### PCR interaction of PCs

Hi, I am using PCA to avoid multicollinearity problems and then I want to use the first 2 PCs in linear regression. The 1st PC contains 60% of...

• Replies: 3
• Views: 1,168
szm
05-24-2013, 12:45 PM
45. ### Help on method selection

Hi all, I wonder whether some of you have some valuable input on which method I should use in my research. The main idea is that I decompose a...

• Replies: 0
• Views: 1,307
05-24-2013, 03:08 AM
46. ### Help understanding Microsoft Excel ANOVA output (Significance F ?)

Hi, So I created my own very simple excel table, with a set of X and Y values, and then I told Excel to run a regression analysis. ...

• Replies: 8
• Views: 19,614
05-23-2013, 12:43 PM
47. ### With or without random effects, same interpretation?

Hi, I did some observations about chickens in a free range area, which was divided in sections. The response variable is: 1 if there were chickens...

• Replies: 0
• Views: 1,830
05-23-2013, 12:03 PM
48. ### Asasociation between two series of measurements

I have series of (metric) lab variables measured in a group of patients, with once daily measurements over 20 days, and I would like to investigate...

• Replies: 5
• Views: 1,327
05-23-2013, 06:04 AM
49. ### Multi-Factors model - Linear regression on Market Size

Dear all, I'm working on a multi factors model analysis to come up with a formula to estimate market size of some countries based on several...

• Replies: 4
• Views: 3,430
05-22-2013, 12:46 PM
50. ### Strange Wald Chi Square Value

I ran a logistic regression model with 46 IV and 405 usable cases (and yes I know that is a lot of IV but for what I was doing it was required). In...

• Replies: 4
• Views: 1,723
05-21-2013, 04:04 PM
51. ### RMA regression

Hello! I'm trying to fit regression as a modeling approach between predictor variables (radiation, temperature, relative humidity, etc.) and...

• Replies: 0
• Views: 2,711
05-21-2013, 03:18 PM
52. ### Moderation analysis problems

Hi girls and guys :) I'm pretty stuck rigth now with my moderation analysis. First of all, this is for my bachelor thesis, psychology. I've...

• Replies: 3
• Views: 3,617
05-21-2013, 02:42 PM
53. ### Multiple linear regression

Dear all, My question is, Why we use W, LR and LM tests instead of F tests to develop the preliminary test estimatior in a multiple linear...

• Replies: 1
• Views: 1,099
05-21-2013, 02:40 PM
54. ### clustering similar lines (on chart)

Firstly sorry if this is the wrong forum for this question. I have a matrix made up of distances in meters and for every distance I have an R2...

• Replies: 0
• Views: 1,131
05-20-2013, 11:28 AM
55. ### Regression with 4 highly collinear IVs and 4 DVs, best approach?

I have a dataset consisting of four continuous independent variables with a value between 0 and 1, and four continuous dependent variables with a...

• Replies: 1
• Views: 1,484
05-20-2013, 10:15 AM

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