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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. What test can I use to find out which bivariate regression is *significantly* better?

    I have three variables: y, x1 and x2 (n=130). I want to know whether one of the x variables is a significantly better bivariate predictor than the...

    Started by verarium‎, 02-15-2011 05:32 PM
    • Replies: 3
    • Views: 3,002
    02-16-2011, 01:49 PM Go to last post
  2. Coefficient of determination and statistical significance

    Hi, I tried two different models for a regression (both with one predictor). The first one was a linear regression model of the type Y= a + bX...

    Started by val92‎, 02-15-2011 05:24 PM
    • Replies: 6
    • Views: 15,365
    02-16-2011, 01:49 PM Go to last post
  3. Error distribution and non linear models.

    Ok, I am reformulating this question because it started rather silly. As I always point out, my background is not statistics so please excuse my...

    Started by darfunkel‎, 02-16-2011 11:31 AM
    • Replies: 0
    • Views: 2,000
    02-16-2011, 11:31 AM Go to last post
  4. Interaction can change slope coefficients

    Hi all, Would anyone be able to explain why an interactive regression model would have different main effects than an additive model of the same...

    Started by not_normal‎, 02-15-2011 10:46 PM
    • Replies: 0
    • Views: 2,136
    02-15-2011, 10:46 PM Go to last post
  5. implications of residual heteroskedasticity

    Hello, I'm running a multiple regression with 4 predictors, and when I examined the Standardized residuals. a Graph is below. I'm just...

    Started by Lambic_Treasure‎, 02-14-2011 02:34 PM
    • Replies: 9
    • Views: 5,866
    02-15-2011, 05:40 PM Go to last post
  6. Red face regression - given model, assess probability of results

    Hi, (It's many, many years since my last foray into statistics so please be gentle..) In its simplest form my question is this: I have...

    Started by TimBom‎, 02-15-2011 09:53 AM
    probability, regression
    • Replies: 1
    • Views: 3,034
    02-15-2011, 05:12 PM Go to last post
  7. Need help on a GMM estimation

    Hello to all, I am trying to do a GMM estimation (with xtabond2) on a little sample of about 250 observation, but I cannot get a good result (in...

    Started by roman10‎, 02-13-2011 02:59 PM
    • Replies: 0
    • Views: 2,489
    02-13-2011, 02:59 PM Go to last post
  8. Moved: single observation multi-year variables

    Started by tomatowill03‎, 02-13-2011 10:10 AM
    • Replies: -
    • Views: -
    02-13-2011, 10:10 AM Go to last post
  9. Confounding and rank of expanded design matrix

    Hello, If I have confounding with 1 defining equation two columns of the expanded design matrix are equal (blocks and the confounding factor). ...

    Started by mmstat‎, 02-11-2011 11:32 AM
    • Replies: 0
    • Views: 2,853
    02-11-2011, 11:32 AM Go to last post
  10. [newbie dumb question] Why is that the assumption of E(u)=0 essential for interences?

    If E(u)=0 is violated, how would it affect the inference of parameters, such as by using t-statistics? My understanding is that if E(u)=0 is...

    Started by elton.li‎, 02-09-2011 06:02 PM
    • Replies: 3
    • Views: 5,360
    02-10-2011, 12:27 AM Go to last post
  11. Using cross-sectional data in pooled time-series analysis

    I'm doing a pooled time-series regression analysis of GHG emissions, relative to aims in the Kyoto-protocol (annual observations 1990-2008, country...

    Started by OleMartin‎, 02-09-2011 04:22 PM
    • Replies: 2
    • Views: 4,803
    02-09-2011, 04:51 PM Go to last post
  12. Marketing Impact Regression

    Hello all! I am rather new to STATA / statistics, so I wanted to see if I can get some help from the experts that browse talkstats.com. As the...

    Started by heechiro‎, 02-08-2011 05:45 PM
    • Replies: 2
    • Views: 2,936
    02-08-2011, 06:09 PM Go to last post
  13. questions on logistics modeling

    While studying logistic modeling, I read the following statement I do not know what do the "case-control" and "cross-sectional studies"...

    Started by winecoding‎, 02-08-2011 04:33 PM
    • Replies: 1
    • Views: 3,180
    02-08-2011, 06:00 PM Go to last post
  14. independant variables?

    I'm a little confused on the whole dependent-independent thing.... I'm doing a multiple linear regression with 13 variables in order to predict...

    Started by danjohnson10‎, 02-08-2011 03:50 PM
    • Replies: 0
    • Views: 2,086
    02-08-2011, 03:50 PM Go to last post
  15. goal is logistical regression model...where to start

    I'm working with weather data using systat software. I have raw values of dependent variable visibility that have been categorized into boolean 1/0...

    Started by civilsurfer‎, 02-07-2011 12:08 PM
    • Replies: 0
    • Views: 2,039
    02-07-2011, 12:08 PM Go to last post
  16. Multiple Regression - Adjusted Rsquare & SEE vs. coefficient sig.

    I'm doing an assignment where we are just learning about regression. We were given a set of data and ran it through SPSS. Now, I am trying to...

    Started by SeraphicMirth‎, 02-04-2011 11:53 AM
    • Replies: 1
    • Views: 5,277
    02-04-2011, 01:51 PM Go to last post
  17. linear regression for non normal data

    Hi, Some of my variables are not normally distributed (with Kolmogorov-Smirnov and Shapiro-Wilk tests). So I used Spearman's correlations. But I...

    Started by neurophilo‎, 02-04-2011 11:15 AM
    • Replies: 2
    • Views: 9,751
    02-04-2011, 11:34 AM Go to last post
  18. Question Formulas for : CVRMSE and Net Mean Bias

    Hi folks, I am in the energy industry, and we do linear/multilinear regressions stats. One of the concepts being introduced to supplement...

    Started by paluee‎, 02-03-2011 12:53 PM
    • Replies: 0
    • Views: 3,620
    02-03-2011, 12:53 PM Go to last post
  19. Help finding standard error

    If i have following regression and numbers: Y(with a "hat" over)= -66,1058 + 0,0650X R^2= 0,9460 Se(standard error) = (10,7509) ( ...

    Started by student89‎, 02-02-2011 05:59 AM
    • Replies: 0
    • Views: 1,712
    02-02-2011, 05:59 AM Go to last post
  20. 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: 4,612
    01-31-2011, 04:32 AM Go to last post
  21. GEE prediction interval... Help?

    Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

    Started by bbikkel‎, 01-30-2011 03:33 PM
    • Replies: 0
    • Views: 2,470
    01-30-2011, 03:33 PM Go to last post
  22. Exclamation Need Help - Dummy variable for GDP per capita

    Please answer the following questions...

    Started by Vedruss‎, 01-29-2011 08:45 AM
    • Replies: 1
    • Views: 3,894
    01-29-2011, 09:39 AM Go to last post
  23. Need help! Fairly simple questions.

    Hey guys, So I successfully proved that the sum of epsilons (the e in y=B0+B1*x+e) equaled 0. Now how do I prove that the sum of xi's...

    Started by amarkham‎, 01-27-2011 09:29 PM
    • Replies: 0
    • Views: 2,305
    01-27-2011, 09:29 PM Go to last post
  24. Exclamation Help Non linear Growth Models - Derivates

    Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion,...

    Started by acocac‎, 01-27-2011 06:59 PM
    gauss, nonlinear
    • Replies: 0
    • Views: 2,476
    01-27-2011, 06:59 PM Go to last post
  25. LSVD regression - how many dummies

    hey, I'm back and making progress :) I want to run a LSDV regression on my panel data. How many dummies do I have to include? All of them for...

    Started by jayde‎, 01-27-2011 09:13 AM
    • Replies: 0
    • Views: 2,692
    01-27-2011, 09:13 AM Go to last post
  26. GLM repeated measurements with very large database

    I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

    Started by drGG‎, 01-27-2011 08:42 AM
    • Replies: 0
    • Views: 2,925
    01-27-2011, 08:42 AM Go to last post
  27. identification with ordinal independent variable

    Hi, Can you help me find the relevant literature for this problem? My regression model is: Yi=Xi*b+Ei, where Yi is income and Xi is a score, Ei...

    Started by 2282‎, 01-26-2011 03:49 PM
    • Replies: 1
    • Views: 3,060
    01-26-2011, 10:15 PM Go to last post
  28. Interpreting unstandardized coefficients and their strength

    Hi, I conducted a multiple regression analysis with 2 independent variables. Now I'm trying to analyze the strength of these variables between men...

    Started by unstandardizedB‎, 01-26-2011 03:32 PM
    regression, unstandardized b
    • Replies: 0
    • Views: 5,525
    01-26-2011, 03:32 PM Go to last post
  29. AIC number of parameter

    Dear all, I am new in this forum. I m facing a problem with my AIC. I m using model selection framework (Akaike’s weights) with various type...

    Started by Rigal@mnhn.fr‎, 01-23-2011 07:31 PM
    aic, ecology, information criterion, model selection
    • Replies: 0
    • Views: 3,915
    01-23-2011, 07:31 PM Go to last post
  30. multinomial logistic regression vs multivariate logistic regression

    multinomial logistic regression vs multivariate logistic regression. Is there differences??? If so how to do with spss multivariate logistic...

    Started by tim999‎, 01-23-2011 08:16 AM
    • Replies: 2
    • Views: 11,305
    01-23-2011, 12:39 PM Go to last post
  31. Red face Stepwise Regression

    When a variable is added and then removed in stepwise regression, what happens to the proportion of the variance it explained?

    Started by kimrayjan‎, 01-21-2011 03:19 PM
    multiple regression, r square, stepwise, variance
    • Replies: 1
    • Views: 3,667
    01-23-2011, 01:06 AM Go to last post
  32. Panel Data and model specification

    Sorry to ask questions which may be obvious to many, but I am just starting out with Stata and econometrics so if anyone could help me I would really...

    Started by tko778‎, 01-21-2011 01:25 PM
    • Replies: 1
    • Views: 4,224
    01-22-2011, 12:23 AM Go to last post
  33. Unhappy i cant understand this question :|

    Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

    Started by smile:D‎, 01-20-2011 10:58 AM
    sxx, syy
    • Replies: 1
    • Views: 3,196
    01-20-2011, 12:04 PM Go to last post
  34. Desperately Need Help with Regression Analysis..Please :)

    hello :) I'm new here (and in doing statistics in general). I have to do a regression analysis on panel data (10 groups, 9 years - 90...

    Started by jayde‎, 01-20-2011 04:03 AM
    multiyear data
    • Replies: 4
    • Views: 3,490
    01-20-2011, 11:17 AM Go to last post
  35. partial R2 in multivariate linear regression

    Hi there! Im performing multivariable linear regression models with SPSS. I would like to know how can I calculate partial R2 for the independant...

    Started by juanpe000‎, 01-18-2011 07:12 AM
    • Replies: 0
    • Views: 5,748
    01-18-2011, 07:12 AM Go to last post
  36. Regression R2 vs Spearman's correlation

    Hi everyone! I have a set of data that shows a very good Spearman's correlation coefficient (p=0,001), but when i calculate a regression equation...

    Started by juacochero‎, 01-17-2011 10:49 AM
    • Replies: 3
    • Views: 19,863
    01-17-2011, 02:32 PM Go to last post
  37. Collinearity

    Hi, Is there any possibility that if colinearity exists between two or more DV variables in a regression analysis, the regression analysis to be...

    Started by alexandros__23‎, 01-16-2011 03:33 PM
    • Replies: 3
    • Views: 6,070
    01-17-2011, 08:00 AM Go to last post
  38. Insignificant regression explanation-HELP!!!

    Hi, As part of my dissertation I am doing a regression analysis in which I am examining if gender, age, Internet use, education and occupational...

    Started by alexandros__23‎, 01-15-2011 07:39 PM
    • Replies: 5
    • Views: 25,398
    01-16-2011, 01:24 PM Go to last post
  39. 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: 4,432
    01-16-2011, 02:46 AM Go to last post
  40. Question Reporting hierarchical regression

    I have a 2-step hierarchical regression. Step 1 Variable A = significant p<.001 Step 2 Variable A = now non significant Variable B =...

    Started by sneaks‎, 01-12-2011 11:57 AM
    • Replies: 2
    • Views: 5,434
    01-15-2011, 07:01 AM Go to last post
  41. Interpreting Interactions in Binary Logistic Regression

    Hi! I was wondering if anyone knows how to interpret interactions in SPSS, for logistic regressions, or how a good source that might outline this....

    Started by stan09‎, 01-11-2011 11:40 AM
    interaction effect
    • Replies: 1
    • Views: 8,740
    01-13-2011, 08:23 PM Go to last post
  42. CLS vs OLS

    What is the difference between classical least squares regression (CLSR) and linear least squares regression (also known as ordinary least squares...

    Started by hazelnut‎, 01-13-2011 08:16 PM
    • Replies: 0
    • Views: 3,903
    01-13-2011, 08:16 PM Go to last post
  43. Random effect

    Hello everybody! I have some problems making a regression. I am told that to correct my data by using random effect. I don'nt know how this...

    Started by freddysurgery‎, 01-13-2011 11:27 AM
    • Replies: 1
    • Views: 2,145
    01-13-2011, 01:59 PM Go to last post
  44. Lack to fit in bayesian beta regression model

    Hello! I have a question about beta regression model. I fitted a bayesian beta regression. - Coefficients are probabilistically (using the...

    Started by Rodrigo1981‎, 01-13-2011 09:37 AM
    bayesian beta regression, lack-of-fit
    • Replies: 0
    • Views: 2,756
    01-13-2011, 09:37 AM Go to last post
  45. Sparse Logistic regression

    What method should be used when the proportions of 1's in a logistic regression problem is very low. (lets say 0.04%)???? Normal logistic method...

    Started by bs0409‎, 11-12-2010 05:28 AM
    • Replies: 2
    • Views: 2,753
    01-13-2011, 08:01 AM Go to last post
  46. Significance of regression coefficients and interpretation problems

    Dear All, I am currently facing a problem regarding the statistical interpretation of nonsignificant coefficients. I would like to know whether...

    Started by pff‎, 01-07-2011 06:05 AM
    • Replies: 3
    • Views: 8,200
    01-11-2011, 02:28 PM Go to last post
  47. Reference for max vars in a model

    I used 7 predictor variables in a regression model with a sample size of 103. Someone who reviewed my manuscript said that was too many predictors. ...

    Started by LBerg‎, 01-10-2011 08:22 PM
    # of predictor variables, sample size
    • Replies: 2
    • Views: 3,015
    01-11-2011, 02:07 AM Go to last post
  48. Problem with mixed effects model with binary data

    Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a...

    Started by pydbl‎, 01-09-2011 11:44 PM
    binary, complete separation, glmer, lmer, mixed effects
    • Replies: 2
    • Views: 4,266
    01-10-2011, 01:00 AM Go to last post
  49. How to convert logistic Coefficient into percentage %

    Hi Please I need help with conveting logistic Coefficient into percentage % to help me with analysing the regression. Regards Mod Note:...

    Started by suha‎, 01-09-2011 02:36 PM
    • Replies: 0
    • Views: 5,639
    01-09-2011, 02:36 PM Go to last post
  50. Dependent variable as a percentage-which model to use

    Hello, I am dealing with a dependent variable which is a percentage, so which regression model would be better in this case? The histogram and...

    Started by pff‎, 01-07-2011 06:59 AM
    • Replies: 1
    • Views: 6,386
    01-09-2011, 02:08 PM Go to last post
  51. Heteroscedasticity

    Hello, I've done a search on this but have not found any similar threads. Using EVIEWS White test I have identified heteroscedasticity in my...

    Started by Epsilon‎, 01-08-2011 02:08 PM
    • Replies: 1
    • Views: 4,774
    01-09-2011, 01:44 PM Go to last post
  52. multiple regression with *many* variables

    Hello I am not a statistician but interested in knowing how the following problem would be approached by those who are. What would you do if...

    Started by Levon‎, 12-27-2010 10:00 AM
    • Replies: 9
    • Views: 18,845
    01-09-2011, 09:35 AM Go to last post
  53. Easy question

    Dear friends: I hope you can help me with this question: I have data of the identity for the GDP=C+I+G+X-M. If I regress C+I+G+X-M, in log...

    Started by cmontalvo‎, 01-08-2011 04:01 PM
    • Replies: 1
    • Views: 2,307
    01-08-2011, 09:36 PM Go to last post
  54. Multinomial Regression

    have a dependent variable with 2+ categories and I know how to run multinomial regression with it. However, in multinomial regression you need to...

    Started by sweeper‎, 01-07-2011 02:10 PM
    • Replies: 0
    • Views: 2,339
    01-07-2011, 02:10 PM Go to last post
  55. P value results

    Dear Colleagues I did a bivariate regression using 10 independent variables on each dependent variable. all the results are significant at 95%...

    Started by momo‎, 11-11-2010 03:51 PM
    • Replies: 7
    • Views: 5,050
    01-06-2011, 07:08 PM Go to last post
  56. Transformation of variable

    Hi All, I am doing simple linear regression and there is curvilinear curve in the scatter plot of the independent and dependent variable. y =...

    Started by sach_83‎, 01-05-2011 10:45 AM
    • Replies: 0
    • Views: 2,918
    01-05-2011, 10:45 AM Go to last post
  57. Cook distance and leverage

    I have a data point for which leverage value is > 3(p+1)/n but the value of cook's distance is < 1. Can i say that, this is an outlier but it is...

    Started by sach_83‎, 01-02-2011 04:37 AM
    • Replies: 1
    • Views: 5,563
    01-02-2011, 07:33 PM Go to last post
  58. 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...

    Started by blastStu‎, 12-22-2010 04:08 AM
    • Replies: 1
    • Views: 2,562
    01-02-2011, 06:56 AM Go to last post
  59. How to check the importance of Dummy variable in multiple regression?

    Hi All, I am doing a Multiple regression with one non numeric independent variable. I changed this variable into a dummy variable which is now...

    Started by sach_83‎, 01-01-2011 05:50 PM
    • Replies: 2
    • Views: 7,732
    01-02-2011, 04:33 AM Go to last post
  60. Multiple regression with SPSS

    Hi All, I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is...

    Started by sach_83‎, 12-29-2010 03:55 AM
    • Replies: 2
    • Views: 14,037
    01-01-2011, 01:39 PM Go to last post

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