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05-10-2017
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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Binary Logistic SNAFU

Hello, I'm curious if I have coded my variables incorrectly for an analysis. Here's a brief explanation: Independent variables: X1:...

• Replies: 3
• Views: 1,019
08-05-2013, 10:22 AM
2. ### Interpretation of Cox's Proportional Hazards Output - Variable Selection

Hi everyone, I understand the basics of Cox's Proportional Hazards modelling, and have run a model I am happy with. I've used the Forward Stepwise...

• Replies: 0
• Views: 1,200
06-02-2014, 12:28 AM
3. ### Power analysis and sample size

Hello all, I've used perused this site numerous times in the past for assistance with statistical issues, but this is my first post. I work with...

• Replies: 0
• Views: 992
01-19-2016, 03:54 PM
4. ### Fisher r to z transform / significance test for two different values of r^2

Short version: I have two values of r^2 from Pearson's correlation, one from a control group (.713) and one for an experimental (.527), and I would...

• Replies: 1
• Views: 2,393
04-01-2015, 08:10 AM
5. ### Step by Step by Step help please?

Hello all, can anyone help me understand this step by step understanding of linear regression and correlation?

• Replies: 6
• Views: 3,955
12-03-2010, 04:14 AM
6. ### Help with interactions in regression

Hi I would really appreciate if anyone could please help me with this. I am doing a regression analysis, looking at the effect of 2 drugs (A or B)...

• Replies: 3
• Views: 1,533
03-04-2015, 08:19 AM
7. ### log-transformation and interaction effects

If I log-transform either one of my predictor variables or my outcome variable, can that change the significance of any of my interaction terms? ...

• Replies: 0
• Views: 3,877
11-29-2011, 07:51 PM
8. ### Forward selection

As most of you probably know, forward selection is a method of model selection that involves introducing independent variables into your model one by...

• Replies: 1
• Views: 2,860
09-04-2011, 04:10 PM
9. ### Logistic Regression - Equation

Hi! I run a logistic regression, and i know that it can be written as Pr(y=1)=F(a+b_1*x+b_2*z). With y being the dependent variable, a the...

• Replies: 4
• Views: 1,987
01-28-2013, 02:02 AM
10. ### Fit Gompertz with vector of dependent variables.

Hi community, Do any of you know where or how I could fit a to a Gompertz? Usually, we just fit some variable vs time to a Gompertz like number...

• Replies: 0
• Views: 1,697
12-03-2012, 03:22 PM
11. ### 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: 1,372
11-07-2013, 12:46 PM
12. ### Fixed effects regression and regression towards the mean

Hi, i use linear fixed effects models to analyze panel data. The dependent variable is a sum score for mental health. Independent variable are...

• Replies: 2
• Views: 1,442
12-05-2013, 05:15 AM
13. ### Problems with variables in multiple linear regression model.

I currently have a dataset I'm looking at for a project. I've been asked to look at 3 variables, svi, gleason, and pgg45 and see how they're...

• Replies: 1
• Views: 1,267
05-22-2014, 08:16 AM
14. ### How to test for and remedy multicollinearity in optimal scaling regression?

I have a data set containing only categorical variables (both nominal and ordinal in nature). The dependent variable is also ordinal (with 4...

• Replies: 0
• Views: 2,919
08-28-2012, 06:22 PM
15. ### Test for and remedy of multicollinearity in logistic regression with categorical IVs

I was searching over net how can I test the presence of multicollinearity and what is its remedy in case the IVs are categorical in a logistic...

• Replies: 2
• Views: 4,536
09-07-2012, 03:22 AM
16. ### Regression with some associated ordinal dependent variables

I have some associated categorical dependent variables that are ordinal in nature (with 4 or 5 categories). If I want to see the effect of a set of...

• Replies: 0
• Views: 1,055
04-23-2013, 02:08 PM
17. ### How to analyze data with more than one associated categorical dependent variables?

I have some dependent variables related to the growth of a company having categories like (e.g. for variables indicating net profit, financial...

• Replies: 4
• Views: 2,323
04-26-2013, 10:56 AM
18. ### Interpretation of the regression coefficient of a proportion type IV

If I want to use some proportion type independent variables in a logistic regression, then what will be the interpretation of the regression...

• Replies: 1
• Views: 3,197
01-11-2013, 06:25 AM
19. ### A regression problem with optional treatment

I have an interesting problem here and really need your suggestion to analyze the data in a proper way. In 2012 we collected data about retention...

• Replies: 0
• Views: 1,425
11-01-2013, 03:48 AM
20. ### Analysis of a longitudinal study where interventions are received at different times

I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

• Replies: 2
• Views: 1,557
10-23-2014, 04:56 AM
21. ### Comparing independent variables in a regression

Hi, I have performed a multiple regression (in SPSS). This is fine, and I've got significant coefficients which tell me their influence on the...

• Replies: 0
• Views: 2,823
07-10-2010, 02:43 AM
22. ### Constant Variable

Hi folks, I was wondering if you could help me understand a problem I have with a regression. Basically, SPSS excludes one of my variables...

• Replies: 2
• Views: 17,600
09-13-2010, 12:38 PM
23. ### Participant ID - Categorical?

Hi all, I'm performing a Binary Logistic Regression on data from human subjects. I want to ensure that the effect of independent variables is...

• Replies: 0
• Views: 3,991
09-13-2010, 09:44 AM
24. ### Regression and Monte Carlo Randomisation

Hi all, I'm currently working with some data in which there are 33 groups of 3 people, with roughly 100,000 datapoints per group. There are two...

• Replies: 1
• Views: 2,547
01-02-2011, 06:56 AM
25. ### Factor in binary logistic regression?

Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

• Replies: 1
• Views: 3,249
04-13-2011, 02:47 AM
26. ### is this model misspecified

i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

• Replies: 3
• Views: 2,722
03-25-2011, 11:12 PM
27. ### Good Tool to generate probability of a sale for 300,000 products

Hi - I am trying to determine a good tool that will help me generate a probability of a sale for a list of of 300,000 products. I have a table of...

• Replies: 0
• Views: 845
03-06-2016, 01:37 PM
28. ### Dichotomized predictor with dichotomized response

I have a dichotomized predictor which can be 0 or 1 and it predicts correctly roughly 80% of the time if a patient is cured 1 or not 0. I tried...

• Replies: 4
• Views: 1,865
01-29-2013, 12:50 PM
29. ### Assumption of Linearity not fulfilled - what to do?

Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

• Replies: 1
• Views: 3,414
09-17-2014, 02:53 PM
30. ### Linear Regression

Hi, I have a dataset which contains a long list of variables (categorical eg. gender, zipcode group etc and continuous eg. income, home value etc)...

• Replies: 0
• Views: 2,049
12-01-2009, 11:19 AM
31. ### Fixed Effects or Random Effects for finding determinants of expenditure

Hi! I am doing a paper on the determinants of healthcare expenditure for the elderly. I have panel data for income and expenditure for a period of 10...

• Replies: 2
• Views: 1,185
02-06-2013, 05:59 AM
32. ### Is it a sensible practice to collapse categories of a predictor?

I used logistic regression to run a model. An explanatory variable called 'region' has 3 levels (1, 2, 3). Level 3 is the reference group. The...

• Replies: 2
• Views: 3,348
09-07-2011, 10:07 AM
33. ### Generate model from known independent & dependent variables. Does this make sense?

I am on a new job as a statistician, after studying stats some years ago. So please bear with me as I seek a solution to my problem. I'm trying...

• Replies: 4
• Views: 2,400
12-15-2014, 05:56 PM
34. ### Please Help! Don't know which model to use

Hello, I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it! The problem...

• Replies: 2
• Views: 2,418
03-25-2011, 11:07 AM
35. ### Regression / modelling help

Hi All, I'm new here so If I've posted this in the wrong place or its not practical then I apologise. I'm new to regression so helpfully Im...

• Replies: 5
• Views: 2,421
02-15-2015, 08:45 PM
36. ### Regression help needed

Hi members, Is there anyone who would be willing to give me 5 hours during the day sometime of some regression / modelling help. Im happy to pay...

• Replies: 0
• Views: 1,222
01-28-2015, 07:03 AM
37. ### Poisson regression with interactions

I am investigating the risk of getting different forms of leukemia if you live near a hazardous waste site in New York state. I am working with PROC...

• Replies: 0
• Views: 3,877
05-05-2009, 04:53 PM
38. ### Regression Analysis and Residual analysis from Minitab output

The questions are on Regression and Analysis and Residuals. I need some explaining oh how to find and answer these questions just from a minitab...

• Replies: 0
• Views: 1,643
04-07-2015, 10:57 AM
39. ### Coefficients and standard deviations

Hi, I have seen in a paper that the author states that the coefficient he gets in a regression implies that an increase of one standard deviation...

• Replies: 2
• Views: 10,877
07-05-2008, 04:58 PM
40. ### can you help me interpret this?

Vitamin D varies with season, below is a method of de-seasonalising vit D from literature. I'm not too sure what they've done after regressing the...

• Replies: 4
• Views: 1,691
01-04-2014, 10:50 AM
41. ### 2sls regression

hi, what be the consequenses of using the same explanatory variables in a simultaneous equations system? for example if both the supply and the...

• Replies: 0
• Views: 1,353
02-15-2015, 11:51 AM
42. ### unit price of total pris?

Hi, I am a first year economic student and are having some fun with regressions. I am doing a a regression analyse of some example data I have...

• Replies: 0
• Views: 1,563
03-05-2015, 05:05 AM
43. ### how to improve Arellano-Bond test for AR(2) in first differences in system GMM?

Hello, I am estimating my regression using system GMM. xtabond2 y L.y x1 x2 x3 yr2004-yr2011 z, gmm(y, lag(2 .) ) iv(x3 yr2004-yr2011,...

• Replies: 1
• Views: 6,689
02-13-2014, 11:18 AM
44. ### comparing regression coefficients among many groups

Hi all, first of all, sorry for my poor English since I'm not native English speaker, I have this simple OLS regression equation model with one...

• Replies: 2
• Views: 2,125
10-08-2013, 06:05 AM
45. ### Logistic regression : negative coefficients, categorical variables

Hi I am trying to build attrition model and have these variables :- 10 categorical variables with sub levels which created into dummy variables and...

• Replies: 3
• Views: 775
04-22-2017, 09:55 AM
46. ### Multiple Regression Help

Hi, I'm currently working on an assignment in which I have to run a multiple regression, however I am a little confused regarding the order of the...

• Replies: 1
• Views: 2,215
11-13-2009, 08:02 AM
47. ### Multiple regression

I have two predictors in my model. One is nominal and dichotomous (Male or Female), and is producing a negative β. The other predictor is ordinal and...

• Replies: 7
• Views: 1,413
01-09-2013, 12:52 PM
48. ### Calculation of parameter uncertainties when using method of least squares

Hi everyone, I am struggling with a maybe simple problem. I have a set of data points (x,y) for which I would like to derive a fitting function of...

• Replies: 1
• Views: 2,138
11-01-2016, 04:41 AM
49. ### F test and t-test

Hi guys, I am analyzing some regression results and the p-value for the F-test is large, but at the same time, the t-test for some of the independent...

• Replies: 2
• Views: 1,522
10-15-2012, 09:03 AM
50. ### Help with easy stats

Hi guys I desperately need help revising for my STATS module. We have been given practice exam questions but are not given the answers so I can't...

• Replies: 0
• Views: 2,736
04-01-2006, 05:52 PM
51. ### T-Test vs. Welch

So, I know very little about statistics and hope you could help me. I understand that I should run a t-test when variances are similar. And a...

• Replies: 0
• Views: 2,505
06-28-2012, 09:21 AM
52. ### Plotting output from logistic regression???

I ran a quasi-likelihood logistic regression using S-plus and have a question about how to plot and interpret the results. How can I construct...

• Replies: 0
• Views: 3,867
09-21-2010, 05:35 PM
53. ### what is: correlation? regression? confidence?

I need to learn statistics for a project I'm working on. I am totally lost and am spending more time than I thought I would on trying to understand...

• Replies: 1
• Views: 4,776
10-09-2009, 03:40 AM
54. ### 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: 2,093
04-26-2012, 11:26 AM
55. ### 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: 1,900
04-29-2012, 06:26 AM
56. ### Interpreting regression output

Hi there, I have performed a linear regression of the energy consumption of an electric car on 7 measured parameters. They are 1. Max...

• Replies: 0
• Views: 1,068
08-06-2012, 05:15 AM
57. ### Sample size multiple linear regression

Hi, Would anybody know of a method or a respectable online calculator for calculating the sample size for a multiple linear regression (being...

• Replies: 1
• Views: 1,680
09-15-2012, 11:30 PM

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