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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Negative value of the constant term..?

    Hi, My name is Roy Klaassen, currently writing my master thesis in the field of marketing management (Tilburg University, the Netherlands). My...

    Started by roybooy‎, 10-31-2011 07:28 AM
    • Replies: 2
    • Views: 4,603
    10-31-2011, 08:10 AM Go to last post
  2. moderated multiple regression with dummy variables

    Hello, As part of final revisions for my dissertation, I need to resolve an issue in my analyses. I am running a moderated multiple...

    Started by Susanmarkunas‎, 07-17-2012 09:06 PM
    • Replies: 3
    • Views: 4,598
    07-18-2012, 07:11 PM Go to last post
  3. Multiple regression problem S Shape Residuals

    Hello: I have posted this question before but wanted to give a more thorough explanation of my problem so as to hopefully garner some assistance. I...

    Started by need‎, 01-26-2012 09:37 AM
    • Replies: 11
    • Views: 4,591
    01-26-2012, 10:16 PM Go to last post
  4. Question Power, Sample Size, Interactions ?

    Hello Everyone BACKGROUND I am working on a psychology project. Initially, I was going to do two separate regressions for each ethnic group but...

    Started by Student T‎, 01-29-2011 12:40 PM
    • Replies: 2
    • Views: 4,581
    01-31-2011, 04:32 AM Go to last post
  5. Link function for proportional outcome

    I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model...

    Started by trinker‎, 04-18-2014 12:09 PM
    2 Pages
    1 2
    distribution, link, multilevel
    • Replies: 24
    • Views: 4,575
    05-06-2014, 06:39 PM Go to last post
  6. Marginal effects after biprobit

    Dear Colleagues, I run a biprobit regression and all variables are significant but I found that the sign of the independent variables changes...

    Started by momo‎, 11-01-2010 04:32 PM
    • Replies: 0
    • Views: 4,563
    11-01-2010, 04:32 PM Go to last post
  7. three way interactions and centering in multiple regression

    Hello, I am examining three variables to see whether they interact with each other to predict my DV using multiple regression. I typically center my...

    Started by psychologygirl‎, 02-14-2009 10:07 PM
    • Replies: 4
    • Views: 4,559
    02-16-2009, 08:43 PM Go to last post
  8. GLM Parameter Estimation in R

    Hello everyone! I was searching for GLM content, then I found this forum, so I thought you could help me :). I'm starting to study GLMs and I know...

    Started by Kol‎, 02-24-2011 08:02 PM
    • Replies: 0
    • Views: 4,556
    02-24-2011, 08:02 PM Go to last post
  9. Combining Model Scores

    Question for the regression modeling experts: I am looking for an efficient and correct way to combine model scores taking into account...

    Started by only1tobin‎, 03-09-2011 04:40 PM
    • Replies: 0
    • Views: 4,541
    03-09-2011, 04:40 PM Go to last post
  10. 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...

    Started by Blain Waan‎, 09-06-2012 02:08 PM
    multicollinearity, regresion
    • Replies: 2
    • Views: 4,536
    09-07-2012, 03:22 AM Go to last post
  11. Explain the nonsignificance of simple slope analysis (with significant interaction)?

    Hi everyone, I need some help. In a study, I tested an interaction hypothesis and got a significant interaction result (p < .05) and visual...

    Started by lijiesjtu‎, 12-16-2011 08:55 AM
    • Replies: 4
    • Views: 4,534
    08-07-2013, 03:42 PM Go to last post
  12. 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...

    Started by adrmck17‎, 04-30-2012 09:54 AM
    • Replies: 3
    • Views: 4,525
    05-01-2012, 02:46 AM Go to last post
  13. Why a simple linear regression (OLS)

    Hi! This forum is so helpful :tup: I just can't seem to find an answer to my question though. I am planning on doing a multiple regression...

    Started by Jazz3‎, 03-02-2017 08:08 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,522
    03-08-2017, 04:04 AM Go to last post
  14. find variance of prediction errors for an AR(2) process

    Hi I have attached my question due to my lack of familiarity with latex at the moment. I need to find the variance of the prediction errors,...

    Started by cjones‎, 05-11-2012 05:58 PM
    • Replies: 0
    • Views: 4,520
    05-11-2012, 05:58 PM Go to last post
  15. Logistic regression failed to converge

    For one of my data sets the model failed to converge. I am sure this is because I have to few data points for logistic regression (only 90 with about...

    Started by noetsi‎, 02-12-2013 07:45 PM
    • Replies: 3
    • Views: 4,515
    02-12-2013, 09:16 PM Go to last post
  16. Hpw to Determine the Hypotheses for a T-test Study?

    delete thread mods please. thanks.

    Started by SoLost‎, 11-28-2009 04:13 AM
    • Replies: 4
    • Views: 4,511
    11-29-2009, 12:04 AM Go to last post
  17. Need help badly!

    You have the ramp-servicing contract for a midsize car wash. For wash workers you use predominantly part time workers, all of whom have sufficient...

    Started by charterpilot‎, 09-08-2010 10:46 PM
    • Replies: 4
    • Views: 4,508
    09-09-2010, 03:49 PM Go to last post
  18. This simple linear regression isn't adding up..

    Edit/Cliffnotes: CORRECTION- The second SSR formula in question is SSR = SUM((yhat(i) - ybar)^2), not SSR = SUM((y(i) - ybar)^2). Dragan resolved my...

    Started by Math Adventures‎, 02-18-2009 08:40 PM
    • Replies: 2
    • Views: 4,504
    02-18-2009, 10:19 PM Go to last post
  19. Time series regression books

    Hi, I am interested in Time series regression and I would like to find 1-2 good books that explain Time series with examples using SAS. Does...

    Started by szm‎, 08-14-2013 06:41 AM
    book, regression, sas, time series
    • Replies: 4
    • Views: 4,502
    08-21-2013, 09:37 AM Go to last post
  20. backtranformation of log transformed data

    Hi forum, I've a simple question that has probably a difficult answer. In a lineair regression of the form: log(y) ~ x resulting in an...

    Started by koen‎, 07-25-2006 09:39 AM
    • Replies: 2
    • Views: 4,495
    04-08-2017, 02:58 PM Go to last post
  21. stronger beta in multivariate than in univariate regression?

    Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

    Started by crudo‎, 10-31-2013 08:00 AM
    • Replies: 1
    • Views: 4,494
    10-31-2013, 08:04 AM Go to last post
  22. Regression for Positive and Negative Integers

    My independent variable is a difference in count data. I was wondering if there was a specific regression that should be used for data that contains...

    Started by tiab2005‎, 10-29-2010 06:08 AM
    • Replies: 1
    • Views: 4,492
    10-29-2010, 10:30 AM Go to last post
  23. Angry How to choose data for your regression

    Hi guys, I'm developing a statistical method to analyse a player's performance in tennis (annotation). To do this I need to decide on certain...

    Started by ianhargreaves80‎, 07-17-2013 12:22 PM
    2 Pages
    1 2
    regression analysis, spss
    • Replies: 16
    • Views: 4,490
    07-19-2013, 12:16 PM Go to last post
  24. Lagged independent variable (Stata)

    Hello, I'm currently working with a company dataset in the form of an unbalanced panel (overall sample size: 1.300 company years, T: 10, X: ~170...

    Started by Cemon‎, 04-23-2013 03:55 AM
    logistic regression, stata
    • Replies: 0
    • Views: 4,488
    04-23-2013, 03:55 AM Go to last post
  25. Impossible exam question!

    I just got done taking an exam by an evil and cruel professor who likes to throw in problems that he's never discussed in class, never assigned for...

    Started by danjohnson10‎, 04-27-2011 08:11 PM
    • Replies: 8
    • Views: 4,477
    04-29-2011, 11:00 PM Go to last post
  26. Linear Regression Models (2)

    β ε note: also under discussion in "Math Help Forum"

    Started by kingwinner‎, 05-14-2009 04:40 AM
    • Replies: 12
    • Views: 4,467
    05-22-2009, 03:35 PM Go to last post
  27. Panel Data Regression and Normality of Variables / Boxcox Transformation

    Hello, I have started the same thread in "Applied Statistics" but I got no answer so maybe this sections is more appropriate. I'm trying to...

    Started by RAUFURS‎, 12-21-2012 09:41 AM
    • Replies: 0
    • Views: 4,462
    12-21-2012, 09:41 AM Go to last post
  28. Forecasting assignment (Time series data)

    Hi - I am new to this forum and hope to learn a thing or two from you experienced lads! I work at a companacy where we are looking into the...

    Started by VBA2010‎, 11-08-2010 05:42 AM
    • Replies: 1
    • Views: 4,460
    11-08-2010, 07:47 AM Go to last post
  29. Help Stats :( Interactions and Homoscedasticity

    IF anyone could help with this right now would appreciate it so much - have tried looking it up anywhere and finding so many different...

    Started by janeduluth‎, 03-22-2008 02:39 PM
    • Replies: 1
    • Views: 4,457
    03-26-2008, 10:33 AM Go to last post
  30. multivariate multiple regression

    Hello all: I'm working on a multivariate multiple regression analysis in SAS. I have 3 response variables and 2 independent variables. When...

    Started by jamesmartinn‎, 12-03-2009 06:58 PM
    • Replies: 0
    • Views: 4,456
    12-03-2009, 06:58 PM Go to last post
  31. Regression coefficient- random variable or a constant?

    Hello, The question is in the attached pdf, thanks in advance. I am sorry, but I having trouble writing math in the thread itself

    Started by mrrmd‎, 06-23-2013 09:45 AM
    • Replies: 5
    • Views: 4,453
    06-23-2013, 02:32 PM Go to last post
  32. Logistic regression. biological significance of a mathematical model quadratic term.

    See if anybody can help me understand something, as I am a bit confused. It is regarding the biological significance of a mathematical model...

    Started by patxarana‎, 10-11-2010 05:30 AM
    • Replies: 2
    • Views: 4,448
    10-11-2010, 07:15 AM Go to last post
  33. Standard error of coefficients for ols vs regression through the origin

    Hi guys, Thought I'd throw this out there officially since I'm having some trouble. I'm under the current impression that if you set up a...

    Started by Link‎, 01-12-2012 06:42 PM
    • Replies: 9
    • Views: 4,447
    01-12-2012, 08:05 PM Go to last post
  34. Multiple Regression, Collinearity Question

    Hello All, I'm running a multiple regression on 8 predictors. A few of the predictors have positive correlations with the response, however their...

    Started by JohnnyBDoe‎, 06-15-2010 05:50 PM
    • Replies: 1
    • Views: 4,440
    06-15-2010, 06:55 PM Go to last post
  35. Chi square as sneak peek into logistic regression

    Let's say I have these variables... Dependent var: cancelled_flag Independent vars: region, gender, etc My ultimate goal is to do a logistic...

    Started by jawon‎, 12-03-2009 07:12 PM
    • Replies: 1
    • Views: 4,429
    12-05-2009, 08:23 PM Go to last post
  36. Manually calculating weights for WLS

    *Posted in Stat Consulting but moved here b/c I think it's more fitting. Hi guys, I'm trying to figure out how to manually calculate the...

    Started by brett45‎, 01-13-2010 03:21 PM
    • Replies: 0
    • Views: 4,426
    01-13-2010, 03:21 PM Go to last post
  37. Comparing coefficients for nested logistic regressions

    Hi, maybe one out there can help. I am interested in comparing the coefficients of two binary logistic models. In one nested in the other one,...

    Started by dnh‎, 11-22-2010 04:09 PM
    • Replies: 9
    • Views: 4,422
    11-24-2010, 08:45 AM Go to last post
  38. P Values on the Intercept

    Hi, I have done a regressional analysis of a data set based on promotions to test the hypothesis that a specific qualification / specialisation...

    Started by wetdog‎, 09-28-2011 12:23 PM
    • Replies: 2
    • Views: 4,406
    10-11-2011, 01:38 PM Go to last post
  39. Question effect size in hierarchical multiple regression (categorical predictor)

    Hello all So glad to have found this useful forum and have already gotten some clarity on other issues related to the hierarchical regression...

    Started by sybil‎, 07-30-2008 01:23 PM
    • Replies: 0
    • Views: 4,400
    07-30-2008, 01:23 PM Go to last post
  40. Teaching multivariate statistics: text & software recommendations

    Hello all, I'll be leading an introductory seminar to multivariate statistics in the spring and was looking for recommendations for texts that...

    Started by jwallin‎, 12-06-2009 07:20 PM
    • Replies: 3
    • Views: 4,388
    12-08-2009, 09:54 AM Go to last post
  41. Degrees of Freedom in case of multiple regression?

    What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

    Started by convivial‎, 07-19-2010 06:41 AM
    • Replies: 3
    • Views: 4,387
    07-19-2010, 10:21 AM Go to last post
  42. advanced method to compare regression coefficient

    Hello, I am regressing two butterfly richness variables (summer and winter) against a set of environmental variables separately. ...

    Started by helenekuo‎, 08-06-2010 05:52 PM
    • Replies: 5
    • Views: 4,385
    08-07-2010, 05:35 AM Go to last post
  43. Variable transformation in OLS regression

    Hi there, I have a question related to the transformation of independent variables in an OLS regression. More specifically: When I transform...

    Started by Tux‎, 06-14-2016 10:08 PM
    • Replies: 7
    • Views: 4,374
    06-20-2016, 06:48 PM Go to last post
  44. Poisson GLM: data set use; influence of counts

    Hello Regression form, I am after a explanation in layman's terms of what's going on behind the scenes with a couple of GLM analyses I'm doing. ...

    Started by Columbine‎, 01-16-2011 02:46 AM
    • Replies: 0
    • Views: 4,372
    01-16-2011, 02:46 AM Go to last post
  45. How does correlation work?

    Dear All, I am a beginner to statistics. I have a pretty basic question. If I have 2 variables X and Y, how does E produce a no which measures...

    Started by john2011‎, 08-28-2011 09:55 PM
    correlation
    • Replies: 2
    • Views: 4,364
    08-28-2011, 11:03 PM Go to last post
  46. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 4,362
    03-25-2012, 01:03 PM Go to last post
  47. Repeated measures regression models in R using nlme (linear) and lme4 (logistic)

    Hello, So, I'm still working on my thesis model, which I asked questions about last week or so. I went to stats help at my university, and have...

    Started by jeskill‎, 09-16-2012 03:04 PM
    • Replies: 0
    • Views: 4,362
    09-16-2012, 03:04 PM Go to last post
  48. Use of p-values for Cox proportional hazards model.

    I'm just reading what looks like quite a robust cohort study looking at patient survival after taking beta-blockers (a heart drug). The authors...

    Started by lovejonesuk‎, 06-05-2011 03:34 PM
    • Replies: 1
    • Views: 4,361
    06-05-2011, 04:37 PM Go to last post
  49. adjusting a proportion score (controling for age)

    I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

    Started by chinaplate‎, 12-15-2008 10:19 PM
    • Replies: 8
    • Views: 4,358
    12-15-2008, 11:23 PM Go to last post
  50. Number of IV's in multiple regressions: How many is 'too many'?

    Hello I need to run a number of individual regressions and am trying to decide how to break them down. I was wondering whether there is a limit...

    Started by gemma7‎, 09-02-2008 07:00 AM
    • Replies: 2
    • Views: 4,352
    09-02-2008, 03:51 PM Go to last post
  51. Ordinal Logistic Regression and Bimodality

    Hello, I'm running ordinal logistic regressions with survey weights. I was under the impression that there are no distributional assumptions for...

    Started by trafalgar‎, 07-24-2009 01:28 PM
    • Replies: 0
    • Views: 4,351
    07-24-2009, 01:28 PM Go to last post
  52. Binomial regression with x as the dependent variable and n as an independent variable

    Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

    Started by emily.stats‎, 03-05-2012 04:24 PM
    2 Pages
    1 2
    binomial, challenge
    • Replies: 15
    • Views: 4,348
    03-08-2012, 05:59 PM Go to last post
  53. Sigmoid curve

    Hi, Is it possible to linearise data for a sigmoid curve? To be clear, I do not mean a logistic function! The data are not between 0 and 1! I...

    Started by rmoerken‎, 06-04-2012 07:31 AM
    • Replies: 8
    • Views: 4,347
    06-12-2012, 04:39 PM Go to last post
  54. reporting descriptive Stats when using gender in multiple regression.

    Hi, I am relatively new to research methods and using SPSS. I wanted to perform multiple regression analysis using categorical and continuous...

    Started by caoimhe‎, 07-18-2012 05:50 PM
    • Replies: 6
    • Views: 4,346
    07-19-2012, 02:39 PM Go to last post
  55. Fit a non-recatngular parabola in R

    Hello, I'd like to fit the formula below to a non-rectangular parabola in R. C = (XI+A-√((ϕI+A )^2-4XϕIA))/2X-R I have several data points...

    Started by nofunsally‎, 09-08-2011 10:01 PM
    hyperbola, non-linear, non-rectangular, parabola
    • Replies: 0
    • Views: 4,329
    09-08-2011, 10:01 PM Go to last post
  56. Ordinal Logisitc Regression with Soccer

    Hi I have made up some statistical results and would like to analyse them. 2 teams playing against eachother: Team A and Team B There are 3...

    Started by zebbie‎, 07-11-2013 08:36 PM
    • Replies: 6
    • Views: 4,329
    07-15-2013, 10:26 PM Go to last post
  57. Regression in excel - Is this possible?

    Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

    Started by c2q‎, 11-22-2010 08:14 PM
    • Replies: 5
    • Views: 4,326
    12-11-2010, 01:59 PM Go to last post
  58. can you extrapolate a moving average WAy into the future????

    Hi, I have monthly sales data. I have been asked to do a time series moving average??? If I do a 2 month moving average I can only predict...

    Started by LizR‎, 01-10-2013 06:16 AM
    • Replies: 3
    • Views: 4,324
    01-10-2013, 05:34 PM Go to last post
  59. regression on age groups

    Dear All, I have the following question: Estimate a simple regression model of ‘libertarian-authoritarian’ attitude as a function of age groups...

    Started by sugabird22‎, 11-17-2015 08:55 AM
    age, group, regression
    • Replies: 5
    • Views: 4,324
    11-17-2015, 06:37 PM Go to last post
  60. Simple Linear Regression with GUM Uncertainties

    I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

    Started by Tom La Bone‎, 07-23-2009 04:31 PM
    • Replies: 0
    • Views: 4,319
    07-23-2009, 04:31 PM Go to last post

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