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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Regression between perceptual data on service quality and time series data

Dear forum experts, My problem is how to do a regression between service quality collected on a seven point Likert scale using a questionnaire...

• Replies: 0
• Views: 1,365
12-03-2013, 07:03 AM
2. ### Goodness of fit for Mixed effects Logistic Regression

Dear all, I am trying to assess the goodness of fit of random effects Logistic regression. a) I would have used a Hosmer-Lemeshow test, but how...

• Replies: 4
• Views: 5,756
12-02-2013, 09:52 PM
3. ### Logistic Regression: attaching 95% CI to predicted probabilities

Hi All, I was wondering how calculate 95% CI for predicted probabilities. I have read how to do the same for odd-ratios, but the way in which what...

• Replies: 6
• Views: 9,774
12-02-2013, 04:54 PM
4. ### Which model to use?

Yes, it's the age-old question of which model to use. I'm not sure if it belongs in this forum section (there are two others where it might fit;...

• Replies: 0
• Views: 1,166
12-01-2013, 09:28 PM
5. ### Logistic regression: how to get ORs and CIs for non-included variables

I'm working on a modeling project using logistic regression with forward selection. I would like to be able to determine the odds ratios and...

• Replies: 8
• Views: 3,268
12-01-2013, 09:18 PM
6. ### Applied linear regression model

any one can tell me the "real life application of linear model" with example ????

• Replies: 0
• Views: 1,434
12-01-2013, 07:59 AM
7. ### [Linear Regression, Theory] Adequacy of Simpler Linear Regression model

Hi Folks, That's my first post so bear with me. Also, apologies in advance for the basic question, but rummaging through Wikipedia, YouTube (which...

• Replies: 1
• Views: 2,537
12-01-2013, 12:18 AM
8. ### Standard Error Correction in Two-Stage Estimation

There have been many papers on error corrections for two-stage estimation, such as Murphy-Topel (85). The basic model proceeds as follows: Stage 1:...

• Replies: 0
• Views: 2,662
11-30-2013, 11:18 PM
9. ### Can you predict a categorical outcome with multiple regression?

Hello - I want to predict an employee will be likely to leave a company based on variables such as tenure, age, function (categorical), # of...

• Replies: 1
• Views: 1,215
11-30-2013, 06:41 AM
10. ### Predict group B membership from group membership A

Hi there, I have an interesting case to solve and I'm very curious to understand how I can implement it. I've done study where a number of...

• Replies: 2
• Views: 1,663
11-29-2013, 11:29 AM
11. ### significance value

Hi I am conducting a multiple logistic regression analysis. The idea is that whatever variables emerge significant in the univariate logistic...

• Replies: 1
• Views: 1,193
11-29-2013, 06:12 AM
12. ### z-Transformation and interpretation

My independent variables are mainly measured in percentages but also Euro and Age. Do I need to do a z-transformation? And how can I interprete...

• Replies: 0
• Views: 1,174
11-28-2013, 04:59 PM

I have two categorical predictors (gender 0,1 and exercise 0,1) and a categorical outcome variable (asthma 0,1). Please someone tell me how to...

• Replies: 0
• Views: 1,293
11-27-2013, 05:14 PM
14. ### Choosing test for longitudinal, repeated measures and clustered data

Hi everyone! I'm a researcher within cardiovascular medicine, currently working on a study in endocrinology (diabetes). I have the following...

• Replies: 0
• Views: 1,317
11-27-2013, 05:10 PM

Please see below and let me know if the general equations for a straight line match with the following research questions. Research Question 1....

• Replies: 0
• Views: 1,147
11-27-2013, 03:10 PM
16. ### 'Significant' product-term interaction but no significant simple main effect contrast

:wave: I'm conducting a conditional logistic regression to assess the association between a continuous predictor and a dichotomous outcome,...

• Replies: 6
• Views: 4,064
11-26-2013, 07:43 PM
17. ### Using Orthogonal Polynomials to remove multicollinearity

Hi I have a homework about using orthogonal polynomials to remove multicollinearity in polynomial models. I've found the concept of polynomial...

• Replies: 0
• Views: 1,702
11-26-2013, 01:53 PM
18. ### Modelling a Regression

For an assignment, I am trying to regress log(wage) on: gender, years of education, race Gender and Race are qualitative variables and years of...

• Replies: 3
• Views: 1,737
11-24-2013, 05:26 PM
19. ### Multiple regression analysis-coefficient table

Hi, I am currently working on a project which requires a multiple regression analysis (using enter-standard method) and I am stuck with...

• Replies: 5
• Views: 1,877
szm
11-22-2013, 04:55 PM
20. ### Relationship between correlation results and regression results

Hello, How is it possible that in correlation analysis many variables are statistically correlated to the variable under consideration but in the...

• Replies: 2
• Views: 1,210
11-22-2013, 03:10 PM
21. ### Regression help!

Please could somebody help with any of the following questions? Im having a lot of difficulty with the regression calculations and dont even know...

• Replies: 3
• Views: 1,732
11-22-2013, 09:19 AM
22. ### Logit Regression Odds when some possible outcomes have been removed

This is my first post of this forum. I'm working on a Logit Regression to predict the nominees and winners of various movie awards. Luckily, I...

• Replies: 6
• Views: 1,689
11-20-2013, 11:46 PM
23. ### 2SLS regression model

I have a query about instrumental variable (IV) and 2SLS (actually three stage) regression. I am trying to estimate effect of core team(a group of 5...

• Replies: 3
• Views: 1,862
11-20-2013, 09:41 PM
24. ### How to interpret time dummies in simple difference in difference regression

• Replies: 0
• Views: 1,397
11-20-2013, 08:11 PM
25. ### Different p-values with different procedures

Fairly novice in statistics, so this will surely have a simple explanation. I ran bivariate analyses to check for normality of a series of variables...

• Replies: 1
• Views: 1,371
11-20-2013, 01:15 PM
26. ### Linear correlation coefficient with a yes or no variable...

Please pardon my ignorance as I have not had statistics in 20 years. I would like to attempt correlate student GPA with use of an ipod during school...

• Replies: 5
• Views: 2,417
11-19-2013, 01:14 PM
27. ### Paired t-test - Inferring causality between two variables (before/after)

Hi, Suppose I have the following data measuring Gene expression (how active the gene is) and blood value (for example Very Low Density...

• Replies: 0
• Views: 1,646
11-19-2013, 06:23 AM
28. ### What test if no linearity

Dear forum members, I am currently struggling with my research about boardmembers and their influence on the strategy. From other articles I...

• Replies: 20
• Views: 3,257
11-18-2013, 04:15 PM
29. ### Two important questions

I now have a good model fit with R2 >=0.90 and P value < 0.05. I have 2 important questions. 1) How do i forecast independent variables to in...

• Replies: 1
• Views: 1,300
11-18-2013, 08:50 AM
30. ### If a potential third variable is a function of two others, is necessarily redundant?

Say I am using regression analysis to try and estimate the assembly time for widgets (which can be produced in various sizes) given some possible...

• Replies: 1
• Views: 1,401
11-18-2013, 08:46 AM
31. ### How to interpret a discontinuous Q-Q plot with jump

Hello, I am currently generating some plots to test whether the given linear model meets all the theoretical assumptions of linear regression. One...

• Replies: 1
• Views: 3,094
11-17-2013, 10:22 PM
32. ### Lags and forcasting performance in ADL model

... Delete

• Replies: 0
• Views: 1,138
11-17-2013, 01:28 PM
33. ### GLLAMM syntax for using instruments

I am seeking help to write the GLLAMM command to estimate y1 = x1 x2 x1*x2 x3; switching equation is x1 = x2 x3 x4 x5, where y1 is the outcome...

• Replies: 0
• Views: 1,321
11-17-2013, 12:31 PM
34. ### Bias in Regression Parameter Estimates

Hi, I am new to Statistics. Currently, I am working on a project that involves missing data analysis. I want to know how to quantify bias for...

• Replies: 0
• Views: 1,512
11-17-2013, 11:28 AM
35. ### why the first two regressions are not enough and why the other two are

we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

• Replies: 0
• Views: 1,024
11-17-2013, 05:19 AM
36. ### is it possible to regress power variables?

Guys I was wondering if this is possible? Assume I would like estimate regression: Y=a1+a2*x2+a3*x3+a4*x4^x5+ei Is it possible? the purpose is...

• Replies: 3
• Views: 1,589
11-17-2013, 02:22 AM
37. ### Error estimate for prediction from regression

I am working with SPSS and I have performed a multiple linear regression with 3 predictors. I am trying to calculate a 95% confidence level error...

• Replies: 0
• Views: 1,235
rim
11-15-2013, 08:46 PM
38. ### Appropriate MANCOVA interaction graph

Hi all, I was hoping to get some help with how best to graph my MANCOVA interaction. I know performing this with univariate data (ANCOVA) is...

• Replies: 0
• Views: 1,469
11-14-2013, 10:38 PM
39. ### Linear Models-Given three objects of unknown weight and a set of scales with one pan.

Hi all, I am new to this and pure desperation is starting to set in. Below is my problem: Three objects with unknown weights are weighed on a...

• Replies: 1
• Views: 1,550
11-14-2013, 02:37 AM
40. ### beta = r, so can beta be greater than 1.0?

I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

• Replies: 13
• Views: 4,127
11-14-2013, 01:15 AM
41. ### Many Level Categorical Variables

Hello All, I am trying to perform multiple regression on some sales data and want to make sure that I am coding the variables correctly. ...

• Replies: 1
• Views: 1,231
11-13-2013, 08:26 PM
42. ### How to do a added variable plot in minitab?

Hi, I have a data set of measurements for body fat, two of the variables are age and neck circumference. I've been asked to estimate the amount...

• Replies: 0
• Views: 3,077
11-13-2013, 05:05 PM
43. ### Can I analyse R-SQ values for different groups using a T-Test?

Hi, I am currently doing a piece of analysis which is now starting to confuse me in terms of what statistical analysis I should apply. My Data:...

• Replies: 0
• Views: 1,392
11-13-2013, 10:52 AM
44. ### How can I find out how shifts in a country's fiscal policies affect economic health.

I have the values of below variables for 20 years for different countries. Could anyone suggest how I should go about this?How can I use regression...

• Replies: 1
• Views: 1,276
11-12-2013, 08:29 AM
45. ### All for one, one for all categorical variable?

Hi everyone, I'm working on a classification model with logistic regression. Here are two independent variables we are looking at: id, sales,...

• Replies: 1
• Views: 1,255
11-12-2013, 08:23 AM
46. ### Should I use regression or logit

Hi Guys, I need to find out the influence of factors affecting female labour force participation. I thought to take female labour force...

• Replies: 2
• Views: 1,730
11-12-2013, 08:18 AM
47. ### The correct regression analysis?

I’m working on a large data set for my masters and I just wanted some advice on what would be the best analysis to do for the example below: If I...

• Replies: 0
• Views: 1,168
11-11-2013, 06:49 AM
48. ### Dummy variable regression with a few observations

Dear all, I have 26 observations about Italian cities. I would like to control for regional fixed effects by adding a dummy variable for each...

• Replies: 0
• Views: 1,229
11-09-2013, 12:22 PM
49. ### Interpretation of SPSS results

Hi all, I am working on my master thesis but I have problems with the interpretation of my results and I hope someone could help me. I am performing...

• Replies: 0
• Views: 1,064
11-09-2013, 10:05 AM
50. ### Log-linear model with negative values

I would like to estimate a log-linear model which contains negative values in the dependant variable. The only advice I've seen is to add a constant...

• Replies: 0
• Views: 1,105
11-09-2013, 02:57 AM
51. ### need help in some questions

need help in cobb douglas function can you please help me i have question in image quality thank you so much please reply so i put imaeg for query

• Replies: 0
• Views: 1,155
11-08-2013, 06:57 PM
52. ### How to model large multivariate dataset

I have a years worth of data at a manufacturing plant with 20 predictor variables and 8 response variables that I'm interested in. A number of the...

• Replies: 2
• Views: 1,360
11-07-2013, 12:46 PM
53. ### regression analysis to measure TV advertising effectiveness

Hi, I am running a TV advertising analysis where I want to measure if having a 5 day advertising campaign or 7 day advertising campaign would be...

• Replies: 1
• Views: 2,048
11-07-2013, 08:40 AM

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