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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Correlation

Is it possible to correlate two categorical variables? I have a data on building homes in different cities. I want to show correlation on how...

• Replies: 2
• Views: 1,231
02-09-2014, 01:39 AM
2. ### Interpretation of GLM output for binomial family

Hello everyone, I need help interpreting GLM output for binomial family and determining if this GLM is the correct one to use according to what I...

• Replies: 0
• Views: 2,247
02-08-2014, 10:59 PM
3. ### Improvement of predicitve power in logistic regression - when is it significant?

I've posted this in another forum before but didn't get answers, so I try it here again I'm running a hierarchical logistic regression to find out...

• Replies: 3
• Views: 2,106
02-08-2014, 06:41 AM
4. ### what shall I do if I find too many significant interaction terms?

I am estimating a logistic regression model and have developed main effects model. I have found that the interaction of a categorical independent...

• Replies: 8
• Views: 2,728
02-07-2014, 10:06 PM
5. ### Outcome variable in almost 80% of the cases zero. What to do?

Dear fellow members, I investigate if physical activity is related to learning outcomes in adult students participating in distance learning....

• Replies: 0
• Views: 1,426
02-07-2014, 09:26 AM
6. ### Addressing unequal error variance

AKA heteroskedacity Other than logging (when that works) and WLS, which I commonly lack the information or intelligence to use, what is the...

• Replies: 4
• Views: 1,150
02-04-2014, 01:36 PM
7. ### Overcoming an error in Logistic Regression Analysis with Epi Info

The normal process for a logistic regression analysis in Epi Info requires steps such as 1.From the Analysis Command Tree, use the READ command to...

• Replies: 0
• Views: 2,043
02-03-2014, 06:35 PM
8. ### Tomographic map of 3D data with a dimension described by probability distribution

I have a three dimensional data set. Two first components are the exact values of(X,Y) and for the third dimension I have a probability attached to...

• Replies: 0
• Views: 951
02-03-2014, 10:06 AM
9. ### Limited Continues Variable as Dependent Variable

Hi All, i'm in dire need of knowing that which regression model is best for me. My dependent variable is a score calculated by some complex method,...

• Replies: 0
• Views: 1,231
02-02-2014, 10:01 AM
10. ### Quadratic terms in a regression

If you put a quadratic term (variable and variable_sq) into a regression, will they always have opposite signs on their respective coefficients? If...

• Replies: 2
• Views: 1,827
02-01-2014, 06:08 AM
11. ### Difference in ranking values

Hi all. For my PhD Thesis I have a question asking participants to rank 4 people on the basis of their preference. My supervisor asked me to...

• Replies: 0
• Views: 870
01-31-2014, 10:28 AM
12. ### Difference in Differences in a linear regression framework

I am looking to incorporate difference in differences (DiD) into a regression framework, and all the examples I have found of such usage in peer...

• Replies: 1
• Views: 1,746
01-29-2014, 09:53 PM
13. ### How to find beta in a regression model?

Dear all, This might be a silly question, however I am a newbie when it comes to Stats. Im currently writing my thesis and for this I am analysing...

• Replies: 11
• Views: 3,519
01-28-2014, 01:07 PM
14. ### Best fit for multiple straight lines

Hi During a study, I have infused the same amount of a hormone into 10 participants. The blood koncentration of the hormone is measured at fasting...

• Replies: 0
• Views: 1,302
MBJ
01-28-2014, 10:11 AM
15. ### Quasi-poisson or negative binominal regression with continuous dependent variable

My dependant variable is originaly count data. Because of many corrections it became continuous variable. Can I still apply quasi-poisson or negative...

• Replies: 0
• Views: 1,368
01-28-2014, 09:26 AM
16. ### To zero or not to zero - Count models

Hi all, I hope you could give me a help in modelling the data I have on the visits to an Emergency Service. I have data on the number of visits...

• Replies: 0
• Views: 1,070
01-28-2014, 07:57 AM
17. ### Matching

Dear experts, For a fMRI (functional brain scan) experiment, I am comparing scans from 40 subjects with a condition that may or may not affect the...

• Replies: 0
• Views: 1,510
01-27-2014, 06:54 AM
18. ### HELP: Generate a new dummy variable

Hey folks, for my master thesis and my logit regression I need to create a dummy variable, but this one is a bit more complex than just a simple...

• Replies: 2
• Views: 1,234
01-26-2014, 02:37 PM
19. ### What Regression Analysis Should I Employ

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

• Replies: 4
• Views: 1,369
01-25-2014, 05:17 AM
20. ### logistic regression: seperate data over time from the same patient

Hello everyone, I have a database of patients that received surgery. I am planning to do a survival analysis comparing two groups of patients,...

• Replies: 3
• Views: 1,485
01-25-2014, 01:07 AM
21. ### Why doesn't the through the origin method work?

I am doing a question on the regression between the number of pizzas and the delivery time. The lowest number of pizzas is 2. I am given the...

• Replies: 3
• Views: 1,455
01-24-2014, 01:20 PM
22. ### Do I have a discrete fit parameter if I fit data to the Heaviside step function?

Hey guys, A question about discrete parameters in a maximum likelihood estimation fit situation: I have seven data points, every data point...

• Replies: 0
• Views: 748
01-24-2014, 08:58 AM
23. ### Finding Least Square Estimates

Hi, Given Y_i=\beta+\beta x_i^2 +\epsilon_i , I want to find the least squares estimate of \beta . I know I need to minimize ...

• Replies: 3
• Views: 1,187
01-24-2014, 04:05 AM
24. ### Logistic Regression - Odd Ratio

Hi, I have the following two logistic regression models where the independent variables are the same for the two models: logit(Brand1) = b0 + b1...

• Replies: 0
• Views: 1,799
01-23-2014, 06:44 PM
25. ### Do my data meet the assumptions for multiple linear regression?

~ There are no outliers in the standard residuals ~ Multicollinearity is not a concern ~ Independent errors are met (Durbin-Watson = 1.95) ~...

• Replies: 7
• Views: 3,312
01-23-2014, 08:12 AM
26. ### squared or interaction terms in PCA?

I'm new to principle component analysis and right now I feel like a 5 year old with a chain saw. I realize the power of PCA, but I don't know how to...

• Replies: 0
• Views: 1,678
01-22-2014, 04:41 PM
27. ### Autoregression model implementation

Hello forum users! I have a urgent question :/ I need to implement an AR(1) Model into Oxmetrics. Optimize my parameters using the OLS method. ...

• Replies: 0
• Views: 1,551
01-22-2014, 01:20 PM
28. ### Expected Multicollinearity: Alternative to Regression?

Hello, I currently extracting a lot of slightly different variables from a Social Network dataset, which I want to regress (or something like...

• Replies: 10
• Views: 2,553
01-21-2014, 11:30 AM
29. ### should I specify or let GLM estimate the ancillary parameter?

Hi, I am using GLM negative binomial regression to examine a positively skewed dv. Under Type of Model, there is a subsection of the menu where...

• Replies: 0
• Views: 1,633
01-20-2014, 06:13 AM
30. ### Marginal effect of dummy interactions

Hi everybody, I am wondering how one can interprete the marginal effect of a dummy that is interacted with a continous variable. The context is...

• Replies: 2
• Views: 1,548
01-19-2014, 02:50 PM
31. ### Help! WLS + Bootstrap

Hello everyone, I would like to do a weighted-least-squares regression through a nonparametric bootstrap in stata. Does anybody know how this...

• Replies: 3
• Views: 2,150
01-17-2014, 04:44 AM
32. ### Transformations in Multiple Regression

Hi All, Context : Multiple Regression, 2 independent variables (x1, x2) . 1 dependent (Y) If I transform my independent variables there is a...

• Replies: 0
• Views: 1,390
01-16-2014, 11:56 PM
33. ### Benefits of converting dependent variable to log form?

For regression analysis, what is the benefit of converting the dependent variable to log form. I'm using hourly wages as the dependent variable. ...

• Replies: 5
• Views: 2,349
01-16-2014, 11:11 AM
34. ### Estimating Confidence Intevals

Hi, I have used a loglikelihood function to estimate 24 parameters. How do I construct a confidence interval given the Hessian (avaliated on the...

• Replies: 2
• Views: 1,318
01-15-2014, 11:50 PM
35. ### Ordinal Probit Regression

Hi everyone, Will you please help me to write syntax in mathlab, for ordinal probit regression? I have 4 predictors( X1,X2,X3,X4) and one response...

• Replies: 1
• Views: 1,754
01-15-2014, 06:03 PM
36. ### Regression Assumptions for different time series models

I am reading a non-statistics book at the moment, which writes about statistics. Not a good constellation, I know. Unfortunately I do not have a...

• Replies: 5
• Views: 1,947
01-13-2014, 09:41 AM
37. ### regression transformation problems

I am currently writing a dissertation on the causes of regional unemployment. My dependent variable is unemployment rate (%). I plan to carry out...

• Replies: 4
• Views: 1,198
01-12-2014, 10:54 AM
38. ### Regression on subpopulation, conditioning on dependent variable

Hi Everybody, I'm interested in knowing the effect of a explanatory variable x, on a dependent variable y, but only for observations that...

• Replies: 0
• Views: 1,151
01-12-2014, 12:26 AM
39. ### Linear regression model - collinearity.

Hello everyone, I'm have a problem with my linear regression model, I really don't know what to do so I've decided to ask you for help. The...

• Replies: 1
• Views: 1,383
01-11-2014, 06:49 PM
40. ### i need solution to regreesion

hi dear friend i want the solution manual to the regression og montgomery i searched a lot of in the web but i cant find a free one. if...

• Replies: 0
• Views: 919
01-10-2014, 05:05 PM
41. ### Logistic Regression problems

Hello, I'm stuck with a - i think very basic - problem, but I'm not getting any further for weeks now, thats why I finally decided to ask. I have...

• Replies: 2
• Views: 1,624
01-10-2014, 01:50 PM
42. ### prediction interval for 2nd order regression?

Greetings – my first post here. I found this forum by a Google search – you were the top hit. It has been years since I had stats but because of...

• Replies: 0
• Views: 1,121
01-10-2014, 12:09 PM
43. ### Modelling percentages in the closed interval [0-1]

Hi all, I am trying to model percentages which are in the closed interval . Specifically, I am not modelling the probability of a yes/no outcome...

• Replies: 11
• Views: 2,790
01-10-2014, 11:14 AM
44. ### RA-Mediation Negative Regression Coefficients

When comparing regression coefficients for determining if mediation has occurred, do you consider whether the number is negative or positive? I...

• Replies: 1
• Views: 1,237
01-09-2014, 07:08 PM
45. ### Multivariate regression in R Commander

Hey at all, my name ist Max and I have a question regarding to R Commander. I used already the search function but I could not find what I'm...

• Replies: 1
• Views: 1,265
01-09-2014, 12:15 PM
46. ### Simple panel data regression tool for my particular analyis problem

I am not a specialist in econometric's or linear regression but I am an engineer with a reasonable grasp of mathematics. I need to conduct a linear...

• Replies: 0
• Views: 1,061
01-08-2014, 03:49 PM
47. ### Multinomial logit with non-independent outcomes?

Say I have a categorical outcome variable that I want run a logit model on and the outcome variable takes on the following values: 1) A 2) B 3)...

• Replies: 1
• Views: 1,725
01-07-2014, 06:05 PM
48. ### What tests can I use?

Basically, I have to variables Carbon Monoxide (CO) and Black Smoke. I have to test whether black smoke influences the level of CO in the...

• Replies: 1
• Views: 1,162
01-07-2014, 06:02 PM
49. ### Blinder-Oaxaca decomposition- T-stats and Group Indicator Variable

Hi everyone, I'm currently doing some pooled blinder oaxaca decompositions on ethnic discrimination using the UK LFS data and have two questions....

• Replies: 0
• Views: 1,130
01-07-2014, 08:54 AM
50. ### Negative Binomial Reg - why changes in significance using one less/similar variables?

Hi, I am running a NBR on a sample of 500 participants to predict survival rate from a set of health indices eg. diagnosed diabetic, history of...

• Replies: 0
• Views: 932
01-07-2014, 06:46 AM

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