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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. test of non-linearity

    I am reading an interesting econometric book where the author suggests testing if non-linearity exist by specifying a quadratic term, if its...

    Started by noetsi‎, 06-25-2016 03:56 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,498
    06-30-2016, 02:24 PM Go to last post
  2. Multiple linear regression: What to do if I have a low Durbin-Watson value?

    I am investigating to what extent do Temperature, Rainfall, GDP per capita, Population, Livestock and Arable Land (IVs) predict Food Calories...

    Started by Miz123‎, 03-09-2017 09:41 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,702
    03-13-2017, 10:41 AM Go to last post
  3. How to choose best robust regression model?

    Hello. There are several robust regression methods like LAR-(aka LAV-, LAD-, L1-Norm-)Regression, Quantil-Regression, M-Estimator, ... They are...

    Started by consuli‎, 02-25-2017 08:01 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,062
    03-21-2017, 02:05 PM Go to last post
  4. Standard error of multiple regression coefficients

    I was revising my undergraduate courses of Statistics which I took before 20 years. I was exercising how to construct ANOVA table for a regression...

    Started by davidbinyam‎, 05-29-2008 11:13 AM
    • Replies: 14
    • Views: 34,312
    12-11-2009, 07:49 PM Go to last post
  5. Interpreting regression coefficients (transformed)

    Hello, I ran a GLM (poisson) analysis and have a list of my coefficients with their SEs. I need help interpreting the betas because the predictor...

    Started by Ochotona‎, 01-11-2010 10:16 PM
    • Replies: 14
    • Views: 21,989
    10-20-2011, 01:33 AM Go to last post
  6. Need help urgently

    I need to run a test to run if a relationship is significant. Hyphothesis H1: Entertainment of the advertisement on web is positively associated...

    Started by Kate10‎, 08-30-2010 02:36 PM
    • Replies: 14
    • Views: 5,256
    09-03-2010, 01:35 PM Go to last post
  7. How good is this regression?

    Hi everyone, new here. I am doing some research concerning 'transportation of college students'. I regressed data of student satisfaction as a...

    Started by graphicsgriffin‎, 06-05-2011 04:49 AM
    • Replies: 14
    • Views: 6,825
    06-18-2011, 05:10 PM Go to last post
  8. Regression Rookie Seeks Help

    Hi I have some data that i have been trying to use regression on. I have done individual regression analysis on Minitab 16 but was wondering is...

    Started by StuckWithStatsStan‎, 02-09-2012 06:54 PM
    • Replies: 14
    • Views: 2,437
    02-10-2012, 10:16 AM Go to last post
  9. Parameter estimation - which method?

    I am new to parameter estimation. It is not clear for me which method is the best to use to estimate parameter of my model: my statistical model has...

    Started by hase‎, 06-11-2012 11:01 AM
    • Replies: 14
    • Views: 4,122
    07-18-2012, 04:06 AM Go to last post
  10. Odds ratio of 1 for bivariate logistic regression

    My wonderous memory is that an odds ratio near 1 is not remotely substantively important, much like a zero slope would be in OLS. But I have a highly...

    Started by noetsi‎, 06-18-2012 07:40 PM
    • Replies: 14
    • Views: 7,093
    07-19-2014, 02:51 PM Go to last post
  11. Relationship between Pearson correlation and variance in regression model

    If the correlation between X and Y, say, is 0.5, then the standard deviation of the differences between the Y values and their predicted values on...

    Started by _joey‎, 08-12-2012 08:50 PM
    • Replies: 14
    • Views: 8,020
    08-12-2012, 11:33 PM Go to last post
  12. Can I use multivariate analysis without univariate analysis?

    Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

    Started by celinetang‎, 04-02-2013 05:39 AM
    • Replies: 14
    • Views: 23,531
    01-26-2016, 11:08 AM Go to last post
  13. Smile Stepwise and all-possible-regressions

    Hi all, Before I start I just wanted to cordially thank you all for this great community...I really admire the work you have done...and the...

    Started by triunk‎, 01-24-2013 11:11 AM
    regression analysis
    • Replies: 14
    • Views: 5,427
    01-29-2013, 12:19 AM Go to last post
  14. Strange results for logistic regression analysis

    Hi there, I'm having a problem for a while now, and I've asked several people who studied statistics specifically but they are not able to explain...

    Started by bramv‎, 03-08-2013 05:41 AM
    • Replies: 14
    • Views: 3,499
    04-03-2013, 12:20 PM Go to last post
  15. Angry Modelling a variable

    Hi everybody, my problem is a variable (age) that I wish to enter into linear regression - but, the variable is not linear. So, I want to model...

    Started by GermanGirl‎, 05-03-2013 05:37 AM
    • Replies: 14
    • Views: 2,455
    05-05-2013, 03:53 PM Go to last post
  16. Proof of Variance(b1)

    So I guess this is simple regression through the origin. I'm not sure if I'm doing this wrong or what to do next in the proof. I skipped a few steps...

    Started by TheRealAct‎, 09-28-2013 04:23 PM
    • Replies: 14
    • Views: 8,695
    09-29-2013, 10:45 AM Go to last post
  17. Univariate Logistic Regression - how to performe

    Hello, I wonder how to perform Univariate Logistic Regression analysis in SPSS. Tested variables are dichotomized and predictors are ordinal and...

    Started by badibad‎, 12-17-2013 01:16 PM
    • Replies: 14
    • Views: 15,712
    12-29-2013, 02:19 PM Go to last post
  18. Categorical dependent variables / ANOVA

    Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

    Started by DOER‎, 03-05-2014 10:34 AM
    • Replies: 14
    • Views: 2,886
    03-10-2014, 09:27 AM Go to last post
  19. Comparing coefficients in Logistic Regression

    Hello ! I would like to have guidance on what follows. I was fitting a Logistic Regression model, and I got the coefficients for the model's...

    Started by gianmarco‎, 07-29-2014 07:08 AM
    • Replies: 14
    • Views: 8,884
    06-02-2015, 09:08 AM Go to last post
  20. Discretization of a continuous variable

    He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

    Started by XPeriment‎, 03-26-2015 06:05 AM
    • Replies: 14
    • Views: 3,255
    03-28-2015, 09:53 AM Go to last post
  21. regression of car accidents vs age (question about normality and implement gender)

    a few basic questions. I'm just starting to learn regression so I'm trying to apply what I'm learning. I have a set of data with ages ranging...

    Started by semidevil‎, 03-03-2016 09:38 PM
    • Replies: 14
    • Views: 2,716
    03-09-2016, 05:11 PM Go to last post
  22. Type 1 error in regression with entire populations

    I have read that you are not supposed to keep choosing different levels of the categorical variable to be the reference level, because this can cause...

    Started by noetsi‎, 10-13-2016 11:55 AM
    • Replies: 14
    • Views: 2,918
    10-15-2016, 10:50 AM Go to last post
  23. Data scattered around y=x

    Hello everyone, I am a researcher in engineering. I do have some background on statistics and mathematics in general, but I am not a professional...

    Started by math4engz‎, 04-23-2017 08:28 AM
    r squared, regression, statistics
    • Replies: 14
    • Views: 1,490
    04-25-2017, 08:15 PM Go to last post
  24. R^2 vs AIC paradox?

    Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

    Started by alfredman‎, 03-28-2011 07:07 AM
    • Replies: 13
    • Views: 16,099
    04-07-2011, 11:10 PM Go to last post
  25. Gauss Elimination

    Hi guys. Im being asked to program Gauss Elimination in R .Im new using this kind of program. It's simple but i don't know how to start. can someone...

    Started by DeMouraBR‎, 06-02-2011 09:45 AM
    • Replies: 13
    • Views: 7,998
    06-09-2011, 10:25 AM Go to last post
  26. Unhappy regression results interpretation help!

    Hi everyone, this is my first post, I have this regression CSAD=a +B|R|+CSAD-1+CSAD-2+e where CSAD is the cross sectional absolute deviation of...

    Started by callput‎, 08-14-2011 08:04 AM
    • Replies: 13
    • Views: 4,922
    08-16-2011, 08:11 AM Go to last post
  27. Logistic Regression and Multiple Regression

    Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

    Started by Andrewdevilliers‎, 09-06-2011 09:36 AM
    categories, logistic regression, logit, multiple regression, multiple variables
    • Replies: 13
    • Views: 3,871
    09-07-2011, 10:17 AM Go to last post
  28. Logistic regression

    What does it mean when I have insignificant Wald test for all my predictor variables in the (Variables in the Equation) table, although the goodness...

    Started by Elham‎, 10-30-2011 02:49 PM
    • Replies: 13
    • Views: 3,434
    11-02-2011, 01:36 PM Go to last post
  29. Linear Model Prediction

    I'm working on a linear model that looks like: Price = B0 + B1(Gender) + B2(Age) + B3(Credit Type) + B4(Home) ... The predictior is price, and...

    Started by amathew‎, 12-20-2011 05:56 PM
    • Replies: 13
    • Views: 3,270
    12-21-2011, 11:06 AM Go to last post
  30. Modelling problem

    Hi there! I have this modelling problem, and I'd like to get some input/ideas. My data are produced power and measured wind speed at a wind...

    Started by caoshaug‎, 02-07-2012 06:20 AM
    • Replies: 13
    • Views: 2,636
    02-13-2012, 09:50 AM Go to last post
  31. Multiple regression in the analysis of telephone calls

    Hi everyone, I'm new to multiple regression and I'm having a few concerns about my analysis and I could do with some advice. Firstly, the...

    Started by jassco‎, 02-10-2012 08:19 AM
    • Replies: 13
    • Views: 3,323
    02-13-2012, 07:51 PM Go to last post
  32. Regression Help! to predict performance using the output of questionaire

    Hi All, Somebody pl. helpe me in the brlow case, As a part of academic project, im intrested in measuring performance of purchase dpeartment in a...

    Started by Arjun‎, 02-22-2012 05:08 AM
    multiple regression, regression analysis
    • Replies: 13
    • Views: 3,000
    02-28-2012, 01:12 AM Go to last post
  33. To Classify Or Not -- Does it make sense to use income brackets?

    At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

    Started by bryangoodrich‎, 09-08-2012 03:59 PM
    • Replies: 13
    • Views: 3,211
    09-11-2012, 10:10 AM Go to last post
  34. Comparing logistic regression nested models

    I put this here rather than the SAS board, because I am not sure what I am saying about this test is correct. I have run across comments that you...

    Started by noetsi‎, 04-15-2013 12:30 PM
    • Replies: 13
    • Views: 6,653
    04-29-2013, 03:51 PM Go to last post
  35. R squared change test for logistic regression

    Some call this F change tests other hieararchical regression (not to be confused with multilevel regression which is also called that by some). It...

    Started by noetsi‎, 01-07-2013 06:14 PM
    • Replies: 13
    • Views: 10,480
    01-08-2013, 06:17 PM Go to last post
  36. Question Interpreting interaction between dummy IV and continuous moderator with log DV

    Hello Community, I urgently need your help to read the results of my regression analysis for my master thesis, which I need to hand in next week....

    Started by esprit88‎, 08-01-2013 04:19 PM
    continuous moderator, dummy, interaction effect, regression analysis
    • Replies: 13
    • Views: 3,286
    08-02-2013, 09:18 AM Go to last post
  37. Heteroskedasticity? Residuals decreases with predicted values

    Hi, really need any help on this: As shown in my residual plot, the residuals is decreasing linearly with predicted values. What kind of...

    Started by pinkpeace7‎, 09-02-2013 03:27 AM
    • Replies: 13
    • Views: 3,511
    09-04-2013, 05:29 PM Go to last post
  38. Spunky's idea of Weighted Least Squares

    hey! sorry for the late post. i didn't end up coming back yesterday until late at night (as usual, lol) but i really wish to clarify whatever...

    Started by spunky‎, 10-29-2013 01:04 PM
    • Replies: 13
    • Views: 2,821
    11-01-2013, 11:37 AM Go to last post
  39. 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...

    Started by bruin‎, 11-11-2013 03:40 PM
    • Replies: 13
    • Views: 4,135
    11-14-2013, 01:15 AM Go to last post
  40. Reviewer questioning my regression in my article, need advice on how/what to respond

    Hi guys. I’ve submitted my first article and a reviewer is questioning my stats. I never had this problem before and I need your help! Quick...

    Started by nightale‎, 07-16-2015 03:57 PM
    • Replies: 13
    • Views: 1,889
    07-20-2015, 10:46 AM Go to last post
  41. Contribution of multiple correlated effects on global observation

    Hello, In a perfect system, I have 0% of signal loss. I found that there are N effects that can contribute to signal loss. I activate each effect...

    Started by Cab‎, 08-04-2015 08:58 AM
    • Replies: 13
    • Views: 2,000
    01-05-2016, 11:35 AM Go to last post
  42. Likert Scale Survey_regression analysis

    Dear all, I am new in this, so please help - I am conducting a survey for my thesis using Likert method. Through this research survey I would like...

    Started by Monjurul‎, 01-25-2016 09:47 AM
    • Replies: 13
    • Views: 1,895
    01-28-2016, 06:13 AM Go to last post
  43. chemical analysis

    Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

    Started by crimelist‎, 03-10-2016 02:44 AM
    • Replies: 13
    • Views: 1,997
    03-10-2016, 11:56 AM Go to last post
  44. Binary logistic regression

    Hi there i ran logistic regression and got the following model: var1: B = -5.670 Sig = 0.01 Exp (B) 0.003 Constant: B = -0.469

    Started by kasperski‎, 08-02-2016 11:54 AM
    • Replies: 13
    • Views: 2,061
    08-08-2016, 11:38 AM Go to last post
  45. Regression with Continuous and Dummy Independent Variables

    Dear Colleagues, I am running a multivariate linear regression analysis but got stuck with this situation. I have one dependent variable (which...

    Started by tomas.bek‎, 04-03-2017 08:56 AM
    continuous variables, dummy variables, multivariate regression, ols, regression
    • Replies: 13
    • Views: 1,588
    04-05-2017, 04:07 PM Go to last post
  46. How to investigate a curvilinear relationship? (power curve?)

    Hi there, Can anyone tell me how to explore this relationship on SPSS using a regression analysis? I have been advised that this relationship...

    Started by crook‎, 01-19-2017 01:01 PM
    • Replies: 13
    • Views: 2,912
    01-19-2017, 11:57 PM Go to last post
  47. Logistic regression - a very simple question

    I have a question regarding the likelihood. I am trying to assess the likelihood of being in a family history positive group (FH+) on alcoholism (0...

    Started by yadayada‎, 07-26-2017 05:54 PM
    • Replies: 13
    • Views: 766
    09-13-2017, 06:03 PM Go to last post
  48. backwards stepwise multiple regression, collinearity. Rejected paper.

    Hi helpful people! My research paper was recently rejected and some of the feedback I received was in relation to the statistical tests done/not...

    Started by potatopatch‎, 09-04-2017 05:33 PM
    collinearity, stepwise regression
    • Replies: 13
    • Views: 535
    09-06-2017, 05:53 PM Go to last post
  49. combining error terms for two dissimilar regressions

    I have a linear regression for Y on X, and a power regression for Z on Y, each having associated error. (the Y values are different (independent) in...

    Started by George Kraemer‎, 09-21-2017 11:32 AM
    • Replies: 13
    • Views: 436
    09-25-2017, 02:36 PM Go to last post
  50. 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: 4,454
    05-22-2009, 03:35 PM Go to last post
  51. Best laid plans...

    My thesis design was to give participants 2 tests. One measures a personal "type" and the other asks "opinions". My manipulation was to reverse...

    Started by Roadguru‎, 05-28-2009 10:21 PM
    • Replies: 12
    • Views: 3,548
    06-24-2009, 04:04 PM Go to last post
  52. Multicollinearity and AIC in stepwise regression

    I am trying to run a stepwise regression with backward elimination on a set of water chemistry data in which there's a high degree of...

    Started by l3a9k‎, 06-14-2011 02:40 PM
    • Replies: 12
    • Views: 15,095
    07-09-2011, 11:57 AM Go to last post
  53. Question Any software to get sample size/power analysis for probit regression?

    Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

    Started by SabbyATL‎, 09-14-2011 04:12 AM
    • Replies: 12
    • Views: 7,955
    09-19-2011, 12:06 PM Go to last post
  54. Question on regression assumptions interpretation

    Hi, I am trying to interpret the plot below. Would it be possible to receive some feedback on my interpretations, as to whether they are correct...

    Started by regression_is_cool‎, 01-03-2012 10:40 AM
    • Replies: 12
    • Views: 2,569
    01-03-2012, 05:50 PM Go to last post
  55. Mixed model with invariant dependent variable?

    First off, full disclosure. I am an engineer by trade. I have some grad-level statistics under my belt, which means I know enough to be dangerous....

    Started by shamrock‎, 01-11-2012 11:07 PM
    • Replies: 12
    • Views: 3,257
    01-19-2012, 10:06 AM Go to last post
  56. back-transformation of logit-transformed behavioral data

    Hello, I am posting with hopes that someone can assist me in making sure that I am back-transforming my data correctly. I have behavioral data...

    Started by rtoaff‎, 01-29-2012 02:27 AM
    • Replies: 12
    • Views: 14,077
    01-31-2012, 02:15 AM Go to last post
  57. comparing regression coefficients from the same model

    Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

    Started by kk49‎, 02-14-2012 10:14 AM
    • Replies: 12
    • Views: 12,627
    02-16-2012, 12:47 PM Go to last post
  58. Is R squared number valid when forcing a slope on regression fit line?

    When I plot my log transformed data and do a regression fit, I get a slope of 3.37 and a r-squared of 0.96. My professor wants me to "force" a slope...

    Started by SeatOFpants‎, 02-15-2012 03:07 PM
    • Replies: 12
    • Views: 5,958
    02-16-2012, 02:06 PM Go to last post
  59. Simple regerssion

    I am new to stats and this may be very easy for Seniors. In my regression analysis I want to find, how “% change” is affected by other variables, the...

    Started by amandeepsharma89‎, 06-04-2012 04:23 PM
    regression analysis
    • Replies: 12
    • Views: 2,126
    06-10-2012, 02:17 PM Go to last post
  60. Regression Analysis and Hypothesis Testing

    Can someone please help me out with these questions. Thanks guys. Yhat = 227.3642 + 6.4075Xt Σ (Xt - Xbar)^2 = ΣXt^2 ≈33.43 σˆ2≈35.4198 Xbar =...

    Started by Georgepass‎, 02-14-2013 08:25 AM
    • Replies: 12
    • Views: 3,955
    02-15-2013, 03:46 PM Go to last post

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