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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Question Confusion over the F-ratio in a hierarchical multiple regression

    Hey all, I'm not used to work with multiple regression analysis, so I would be glad if anyone could help me interpreting this result: I...

    Started by Comfort Eagle‎, 08-26-2013 03:43 AM
    f-change, f-ratio, hierarchical regression, multiple regression
    • Replies: 1
    • Views: 7,522
    08-26-2013, 09:33 AM Go to last post
  2. Timeseries: sig. Ljung-box Q, but residuals normally distributed

    Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

    Started by Eyecatcher‎, 05-03-2012 11:02 AM
    exponential smoothing, ljung-box q, timeseries
    • Replies: 4
    • Views: 7,520
    05-03-2012, 12:15 PM Go to last post
  3. Removing insignificant variables

    Say I'm plotting a multivariate regression with five variables, and three of them come up statistically insignificant. Why is it important to try...

    Started by constantly‎, 03-20-2011 04:51 PM
    • Replies: 2
    • Views: 7,477
    03-21-2011, 01:49 AM Go to last post
  4. Two dependent variables, same independent variables

    Hi, If I have two very similar regressions where the only difference is the dependent variables, can you compare the influence of the independent...

    Started by tiab2005‎, 02-25-2011 09:12 AM
    • Replies: 1
    • Views: 7,470
    02-27-2011, 03:27 PM Go to last post
  5. 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: 7,456
    06-30-2016, 02:24 PM Go to last post
  6. R^2 for linear multiple linear regression

    I have two candidates for a linear regression model on y, say x_1, and x_2. So I get two linear regression model for each (b_i*x_i+a_i+e_i) each...

    Started by raver_68‎, 05-11-2010 05:00 PM
    • Replies: 5
    • Views: 7,437
    05-12-2010, 04:25 PM Go to last post
  7. too many dummy variables

    Hello I have a categorical independent variable, with 11 levels...so I need 10 dummy variables. I wanted to ask how can I analyze 10 dummy...

    Started by NN_STAT‎, 07-19-2012 12:15 PM
    • Replies: 10
    • Views: 7,410
    07-20-2012, 02:55 AM Go to last post
  8. Estimated Variance of R squared

    I'm looking to compare two R squareds using a formula derived from a article called Correlation Redux by Olkin & Finn. This technique doesn't appear...

    Started by trinker‎, 04-21-2011 07:35 PM
    • Replies: 4
    • Views: 7,409
    04-23-2011, 11:50 AM Go to last post
  9. Moderated multiple regression and mixed factorial ANOVA

    I conducted a moderated multiple regression and a mixed factorial ANOVA on the same variables and got two different results (using moderated multiple...

    Started by acue‎, 06-06-2011 10:48 PM
    • Replies: 5
    • Views: 7,407
    08-27-2011, 03:52 PM Go to last post
  10. Sum of the residuals in multiple linear regression

    In my textbook, the following results are proved in the context of SIMPLE linear regression: ∑e_i = 0 ∑(e_i)(Y_i hat)= 0 I tried to modify the...

    Started by kingwinner‎, 06-20-2009 07:09 AM
    • Replies: 1
    • Views: 7,381
    06-20-2009, 07:28 AM Go to last post
  11. Fixed Effects and interaction terms

    I am trying to analyze sex difference in housework time using longitudinal data with Fixed Effects. Since, sex is time-invariant I can not...

    Started by Laco‎, 03-01-2012 05:33 PM
    • Replies: 2
    • Views: 7,376
    03-01-2012, 06:01 PM Go to last post
  12. Exclamation Linear Regression - About R-squared and slope

    My question is that why low or high R-squared has no bearing on whether the estimated slope has a causal interpretation. My explanation is because...

    Started by non-sleeper‎, 03-20-2010 12:01 PM
    • Replies: 0
    • Views: 7,371
    03-20-2010, 12:01 PM Go to last post
  13. Need help with regression statistics analysis

    Hello I need serious help. I did my last project fine. I've followed all my instructions for this final project, and did everything, but the part to...

    Started by HeavenSoldier‎, 04-04-2006 01:46 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 7,366
    04-19-2006, 10:20 PM Go to last post
  14. Interpretation of estimated coefficients

    Started by TrueTears‎, 08-30-2012 11:10 AM
    • Replies: 9
    • Views: 7,356
    08-30-2012, 02:24 PM Go to last post
  15. R squared value and type of regression

    Hi. I am doing regression in Excel between two factors. I am getting r squared value as follows: 0.435 when choosing linear 0.443 when choosing...

    Started by graphicsgriffin‎, 06-22-2011 03:23 PM
    • Replies: 6
    • Views: 7,346
    06-27-2011, 10:46 AM Go to last post
  16. Help with prediction interval problem

    Construct the indicated prediction interval for an individual y. The equation of the regression line for the paired data below is = 3x and the...

    Started by maharriso‎, 11-13-2006 02:50 PM
    • Replies: 0
    • Views: 7,309
    11-13-2006, 02:50 PM Go to last post
  17. Multiple Regression Repeated Measures with a continuous independent variable

    I have a complete within-subjects 2x2x5 designs, i.e. all 12 subjects I have have done the 20 combinations of conditions. My problem is that the 3rd...

    Started by metric‎, 10-15-2010 12:04 PM
    • Replies: 1
    • Views: 7,309
    10-29-2010, 08:47 PM Go to last post
  18. OLS + Serial Correlation + Cochrane-Orcutt Procedure

    Hi Forum Experts, I am working through a OLS regression analysis where there is positive serial correlation in the independent variable over time....

    Started by scienceskillz‎, 06-17-2011 12:44 PM
    • Replies: 2
    • Views: 7,288
    06-20-2011, 08:37 PM Go to last post
  19. Constant Elasticity Model

    I was wondering if anyone could please try to help me understand where I'm going wrong with the following logic: I have been trying to look at a...

    Started by Matpyris‎, 10-18-2012 09:59 AM
    constant elasticity, interpreting regression, power regression
    • Replies: 1
    • Views: 7,270
    10-23-2012, 09:31 AM Go to last post
  20. Curve estimation command in SPSS to help determine type of regression?

    Hi everyone, will the curve estimation command in SPSS help me in determining the type of regression? For example, I am doing regression between...

    Started by graphicsgriffin‎, 07-01-2011 04:33 PM
    • Replies: 0
    • Views: 7,261
    07-01-2011, 04:33 PM Go to last post
  21. transform y to log(y)

    Hi, I'm wondering what kind of data is appropriate for transforming the response y into log(y)? ( So the model becomes log(y)= a^x1 +...

    Started by zzzc‎, 10-22-2010 08:12 PM
    • Replies: 10
    • Views: 7,238
    11-08-2010, 01:43 PM Go to last post
  22. Variables in Logistic Regression Analysis

    I am trying to come up with a model to predict a binary dependent solution. I want to incorporate ordinal independant variables as the predictors. ...

    Started by danh32‎, 07-22-2010 12:32 PM
    • Replies: 2
    • Views: 7,226
    07-23-2010, 10:10 AM Go to last post
  23. coefficient changes direction with interaction term entered

    Hi I'm running a logistic regression and my first model tests the direct effects of a variable (X) which is initially negative. In the second model...

    Started by dce219‎, 06-11-2011 10:05 AM
    • Replies: 2
    • Views: 7,203
    06-13-2011, 08:47 PM Go to last post
  24. Comparing regression models for transformed and untransformed data

    I feel like I saw an answer to my question on here in the past, so I apologize if this is a repeat, but I have been unable to find the answer today...

    Started by PhDOH!‎, 03-27-2011 12:11 PM
    • Replies: 2
    • Views: 7,129
    05-25-2011, 12:36 AM Go to last post
  25. Stepwise selection and dummy variables

    Hi Can you do forward or backward selection if there are categorical variables involved? If you can, how can it be done? Is there a way to...

    Started by Ipinho100‎, 12-20-2011 10:19 AM
    • Replies: 9
    • Views: 7,106
    12-21-2011, 09:38 AM Go to last post
  26. 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: 7,075
    07-19-2014, 02:51 PM Go to last post
  27. Relationship between correlation matrix and R square

    Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

    Started by liamplayt‎, 01-21-2012 11:39 PM
    r squared
    • Replies: 2
    • Views: 6,994
    01-22-2012, 09:54 AM Go to last post
  28. Linear Mixed Effects Regression

    Hello, Please can anyone help me with the above topic. I'm using SAS and am unsure on how to program this. I think that a PROC MIXED is to be...

    Started by sasa81‎, 10-16-2010 04:40 PM
    • Replies: 5
    • Views: 6,970
    12-10-2010, 07:14 AM Go to last post
  29. Linear regression with repeated measures

    Hi, I have the following question: I have a dataset that contains data from 9 subjects that were tested twice for a couple variables. I try to do a...

    Started by Jurriaan‎, 09-12-2008 09:05 AM
    • Replies: 2
    • Views: 6,959
    06-05-2010, 12:20 AM Go to last post
  30. Question Unstandardized regression coefficients

    Hi all (first post :wave:), I've recently encountered some problems regarding unstandardized (partial) regression coefficients in my coursework. ...

    Started by friendlouis‎, 04-11-2010 02:21 AM
    • Replies: 0
    • Views: 6,941
    04-11-2010, 02:21 AM Go to last post
  31. Help with interpretation of Wald, chow, t-tests

    Sorry about the double post - it is in the elementary forum as well. But I should have put it here to begin with. Thanks in advance. I hope you...

    Started by nerdboy2317‎, 04-30-2011 01:16 AM
    • Replies: 1
    • Views: 6,925
    04-30-2011, 05:30 PM Go to last post
  32. Help with low Durbin Watson value

    I have a large table of time series data. I am trying to build a regression model and all assumptions are satisfied except independent errors. The DW...

    Started by micdhack‎, 09-09-2012 10:36 AM
    • Replies: 1
    • Views: 6,924
    09-09-2012, 03:52 PM Go to last post
  33. Regression with latent variable

    Hi, I'm doing some research for my dissertation and need to construct a latent variable that includes observations of various economic...

    Started by Swede159‎, 04-15-2011 11:01 AM
    latent variable
    • Replies: 3
    • Views: 6,922
    04-17-2011, 01:11 PM Go to last post
  34. Penalty Analysis

    Hi, how do we interpret the result of penalty analysis having negative mean drop (which is sig) as well as negative penalties (which is also sig)....

    Started by cassandra010666‎, 07-13-2011 08:46 PM
    • Replies: 1
    • Views: 6,869
    07-13-2011, 09:16 PM Go to last post
  35. Doing correct backwards elimination with interaction terms?

    I'm wondering about this, and I can't find an answer anywhere. My textbook (Agresti and Finlay 2009) clearly says how to do backwards elimination on...

    Started by Lukan27‎, 01-26-2015 12:49 PM
    2 Pages
    1 2
    backwards, correct, elimination, interaction, term
    • Replies: 15
    • Views: 6,857
    01-27-2015, 10:27 AM Go to last post
  36. Smile Calculating Covariance Matrix (Regression Analysis)

    Im having difficulty in trying to compute the Covariance Matrix. I think Im missing out an equation to be honest. Here's what I've been given in the...

    Started by garunas‎, 11-27-2011 01:19 PM
    covariance matrix, least squares, regression analysis, variance
    • Replies: 4
    • Views: 6,825
    11-28-2011, 04:36 PM Go to last post
  37. Normalized dependent variable in regression

    Hello I have normalized my DV to have normal residuals for regression analysis using natural logarithm transformation. However I'm confused about...

    Started by Bahareh‎, 10-18-2013 02:41 AM
    • Replies: 5
    • Views: 6,818
    10-21-2013, 08:11 AM Go to last post
  38. Logistic Regression with too many IV

    Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

    Started by WeeG‎, 03-27-2011 02:15 PM
    • Replies: 11
    • Views: 6,810
    04-01-2011, 12:45 PM Go to last post
  39. 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: 6,804
    06-18-2011, 05:10 PM Go to last post
  40. Post Check and develop my answers, multiple regression

    This is the question, i was wondering if anyone could check if i did the correct thing, and help me develop my written answers if needed. a)...

    Started by Mosphaitus‎, 08-17-2008 08:22 AM
    • Replies: 4
    • Views: 6,800
    08-17-2008, 12:49 PM Go to last post
  41. MANOVA vs multiple ANOVAs

    Hello everyone, For starters, I just found this site and am wondering where it has been all my life, or all my PhD, they feel like the same thing...

    Started by kron3007‎, 11-18-2010 05:26 PM
    • Replies: 1
    • Views: 6,783
    11-18-2010, 11:24 PM Go to last post
  42. Model specification for Pooled Panel Regression

    I am doing a research on the diversification potential of microfinancial assets. The methodology I use is a mean variance spanning test. I have to...

    Started by sebneedhelp‎, 03-26-2011 12:59 PM
    • Replies: 1
    • Views: 6,778
    03-27-2011, 09:06 PM Go to last post
  43. Logistic regression convergence issues

    Hi Folks! I'm using logistic regression for classifying records into groups. The issue with logistic regression is that if any cell in the...

    Started by jrai‎, 03-30-2012 12:24 AM
    • Replies: 8
    • Views: 6,772
    04-04-2012, 01:12 PM Go to last post
  44. Linear Regression Proof

    Hello! Can anyone help me in writing a proof regarding linear regression? I do not know how to go about it. I have attached the document...

    Started by augustpolarbear‎, 03-19-2010 08:41 PM
    • Replies: 1
    • Views: 6,761
    03-19-2010, 09:02 PM Go to last post
  45. Should we remove non significant 1st order effects when interaction is significant

    My question is simple: When you have a multiple regression equation which is: Y = a0 + a1.X1 + a2.X2 + a12.X1X2 is it correct to remove...

    Started by lbarcelo‎, 12-03-2007 03:05 PM
    • Replies: 4
    • Views: 6,758
    08-20-2012, 10:02 AM Go to last post
  46. Regression questions

    Hey everybody. I want to start out by saying Thank You for taking the time to look at my thread. I have completed my Stats course and now I am on to...

    Started by USMstudent85‎, 10-12-2011 11:13 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 6,736
    10-18-2011, 10:31 AM Go to last post
  47. How2interpret inconsistent Beta values in different steps of hierarchical regression?

    I did hierarchical regression analysis on my data due to having moderation effects in my research model. R2 increased from .695 in model1 (main...

    Started by Cyrs‎, 07-20-2012 03:57 AM
    • Replies: 3
    • Views: 6,720
    07-20-2012, 02:50 PM Go to last post
  48. Multiple regression vs partial correlation

    I have another question. I have only 40 patients and 5 domains (or factors) made of 16 (questionnaire) items. In order to get correlation...

    Started by Susanbwh‎, 02-14-2006 09:06 AM
    • Replies: 1
    • Views: 6,716
    02-14-2006, 09:27 AM Go to last post
  49. Doing logistic regression using epi-info

    Hi there! I'd really appreciate help with this one. I'm finding the prevalence of anemia and its determinants. There are about 23 factors that...

    Started by confusedmedstudent‎, 12-10-2006 05:01 AM
    • Replies: 0
    • Views: 6,711
    12-10-2006, 05:01 AM Go to last post
  50. Regression analysis research project help.

    Hi, I have a project i have to do for my regression analysis course. Basically I need to gather a bunch of data and plot it and find a regression...

    Started by c2q‎, 10-12-2010 01:10 AM
    • Replies: 1
    • Views: 6,692
    10-12-2010, 01:07 PM Go to last post
  51. Multicollinearity

    Hello at everyone, I'm new at the site, and I'd appreciate your suggestions. I have a multiple -through the origin- regression model. Working with...

    Started by hernan‎, 08-24-2007 06:13 PM
    • Replies: 2
    • Views: 6,677
    08-24-2007, 06:49 PM Go to last post
  52. 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: 6,647
    04-29-2013, 03:51 PM Go to last post
  53. Multiple chi-square or logistic regression?

    Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

    Started by Chris Webber‎, 06-22-2009 08:54 AM
    • Replies: 1
    • Views: 6,626
    06-22-2009, 07:36 PM Go to last post
  54. 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,...

    Started by boldmiga‎, 02-13-2014 10:38 AM
    arellano-bond test, gmm, system gmm, xtabond2
    • Replies: 1
    • Views: 6,613
    02-13-2014, 11:18 AM Go to last post
  55. Need help on ( unadjusted and adjusted w / 95% cl) odds ratio

    I am doing Logistic regression on spss. My dependent variable is test result (+ or -) independent variables are Age and Gender (M,F). How can i get...

    Started by zqkal‎, 01-30-2012 01:24 PM
    • Replies: 1
    • Views: 6,586
    01-30-2012, 01:26 PM Go to last post
  56. Effect size in multiple regression

    Hello, I'm using this this calculator to determine a rough sample size for a multiple regression (20 predictors). ...

    Started by bradyj2‎, 09-20-2012 08:53 AM
    • Replies: 5
    • Views: 6,584
    09-20-2012, 11:30 AM Go to last post
  57. Skewed dependent variable in logistic regression-how to handle

    I am conducting research on juvenile firesetting with a child's self report of firesetting as my dependent variable.(0= never played with or set...

    Started by chbowling‎, 11-07-2012 08:48 PM
    skewness regression
    • Replies: 4
    • Views: 6,577
    11-08-2012, 07:18 PM Go to last post
  58. Need Urgent help in Kruskal's relative importance

    Hi, My client wanted us to perform Kruskal's relative importance technique on some of their modeling work. We have reviewed lot of literature and...

    Started by zabbs‎, 05-27-2011 01:24 PM
    • Replies: 2
    • Views: 6,546
    10-04-2011, 11:01 AM Go to last post
  59. GLM: Assumptions and choosing a model

    Hello all, I have a question that I would be interested in hearing other's opinions/feedback. I have monthly cost data from 2006 to 2011 (72...

    Started by lancearmstrong1313‎, 08-22-2012 07:30 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,517
    08-24-2012, 06:26 PM Go to last post
  60. Lag Length for Breusch Godfrey with Cross Sectional data

    Hey guys, I am working on my master thesis and I use STATA. I have cross-sectional data with not really a time component. However I ordered my...

    Started by maxt‎, 02-20-2014 09:55 AM
    • Replies: 6
    • Views: 6,515
    03-04-2014, 01:53 PM Go to last post

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