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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Question Multiple Regression - Interpreting t-stat

    Hi all, If the model fit is satisfactory (ie. R-squared value is sufficiently high), how should the t-stat be interpreted... my reading indicated...

    Started by big-b‎, 08-28-2006 12:22 AM
    • Replies: 1
    • Views: 106,729
    08-29-2006, 01:56 PM Go to last post
  2. The assumptions of multiple regression: An article by TalkStatters!

    Hi everyone, A lot of you are aware of this already, but I'm posting this to a public subforum on Quark's suggestion :) Recently a group of 3...

    Started by CowboyBear‎, 09-10-2013 10:31 PM
    • Replies: 3
    • Views: 91,939
    12-21-2015, 02:02 PM Go to last post
  3. Assumptions of logistic regression

    Anyone know a good authoritative source for the assumptions of logistic regression? They differ obviously from OLS and I have not found a good source...

    Started by noetsi‎, 11-22-2011 01:43 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 47
    • Views: 84,361
    11-29-2011, 07:40 PM Go to last post
  4. Linear regression with non-normal data?

    It is my understanding that for linear regression both data sets must be normally distributed. One of my two sets of data (x) is normally...

    Started by GrungyGoose‎, 11-13-2011 11:23 AM
    3 Pages
    1 2 3
    normality, regression
    • Replies: 43
    • Views: 81,254
    07-15-2013, 10:15 PM Go to last post
  5. Question obtaining β(hat)s from weighted least square regression

    I'm doing Regression analysis under stratified random sampling for my research since it's usually assumed in many textbooks that the data is simple...

    Started by heystar‎, 06-27-2011 11:06 PM
    regression, stratified sampling, weights
    • Replies: 0
    • Views: 61,133
    06-27-2011, 11:06 PM Go to last post
  6. Postive correlation but negative coefficient in regression??

    Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

    Started by statto‎, 08-20-2011 09:39 AM
    2 Pages
    1 2
    rho/beta conflict, suppression
    • Replies: 23
    • Views: 57,487
    10-07-2016, 04:31 AM Go to last post
  7. Linear Regression: Mean square error (MSE) ?

    Simple linear regression model: Y_i = β0 + β1*X_i + ε_i , i=1,...,n where n is the number of data points, ε_i is random error Let σ^2 = V(ε_i)...

    Started by kingwinner‎, 05-21-2009 07:46 PM
    • Replies: 11
    • Views: 56,643
    12-11-2011, 12:32 PM Go to last post
  8. Does the intercept p value matter?

    Hi, I have outputs of a simple linear model as follows: y = 0.0339 + 0.27918X The p value of the intercept is 0.206 and of the slope is...

    Started by anglais428‎, 03-08-2011 06:48 AM
    intercept p value
    • Replies: 4
    • Views: 52,712
    03-28-2011, 08:14 PM Go to last post
  9. how to prove COV(y bar, estimated beta1) in linear regression equals 0

    Yi=Xi*beta1 + beta0 + error Prove: COV(average of Yi, estimated beta1) = 0 Thanks!

    Started by hehe1223‎, 06-27-2010 07:30 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 44,065
    09-10-2015, 12:27 AM Go to last post
  10. Price Elasticity based on log regression

    Hello genius people!! 1) If i understand correctly, In the regression equation below, WS= White shoes BS=Black shoes Sales of WS = β1...

    Started by PKA111‎, 01-27-2013 03:17 PM
    • Replies: 9
    • Views: 43,103
    02-04-2013, 01:26 PM Go to last post
  11. univariate vs multivariate

    Hi, I have a question about interpreting univariate vs. multivariate (linear) regression. When I'm reading journal articles often both approaches...

    Started by williaml‎, 01-06-2009 08:58 PM
    • Replies: 5
    • Views: 41,641
    04-02-2013, 05:41 AM Go to last post
  12. Collinearity Among Categorical Variables in Regression

    Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

    Started by jastingo‎, 01-21-2012 05:40 PM
    • Replies: 6
    • Views: 36,021
    01-25-2012, 03:52 PM Go to last post
  13. 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: 34,957
    12-11-2009, 07:49 PM Go to last post
  14. Proper Interpretation of odds ratio less than 1 for my study

    Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

    Started by MariaF‎, 07-22-2013 04:08 PM
    2 Pages
    1 2
    odds ratio invertibility, odds ratio less than 1
    • Replies: 18
    • Views: 33,635
    03-25-2016, 03:55 PM Go to last post
  15. Multiple Regression and Likert Scale Data

    With multiple regression, is it necessary to recode independent variables that are measured using Likert Scale responses into dummy variables (with...

    Started by graduate32‎, 03-21-2010 12:10 AM
    • Replies: 2
    • Views: 31,301
    03-25-2010, 10:03 AM Go to last post
  16. Linear Regression Without intercept ?

    hello i m little confuse i want to know that when its is suitable to use regression without intercept ? Any advantage over using linear regression...

    Started by wahibr‎, 08-20-2011 03:37 AM
    • Replies: 10
    • Views: 29,592
    08-21-2011, 02:34 AM Go to last post
  17. is there a non parametric alternative to multiple linear regression?

    Hi all, I would like to know is there a non parametric alternative to multiple linear regression? when I google the quesion I get a lot of info...

    Started by David Williams‎, 09-21-2010 11:25 AM
    • Replies: 7
    • Views: 29,021
    10-07-2010, 03:37 PM Go to last post
  18. Collinearity in Logistic Regression

    If my independent variables are correlated in Linear Regression, I can first, check it using VIF, and solve it (PLS, other ways). What do I do if...

    Started by WeeG‎, 08-19-2010 04:28 AM
    • Replies: 8
    • Views: 28,169
    08-24-2010, 01:50 AM Go to last post
  19. What to report in a mediation analysis

    Hello Given my comprehensive lack of statistical knowledge, I have gained a lot of information over the last five months browsing this forum. But...

    Started by honeybegentle‎, 08-27-2012 04:18 PM
    • Replies: 2
    • Views: 27,233
    08-28-2012, 07:10 PM Go to last post
  20. Mallow's Cp Statistic as criterion for regression

    I am building a multiple regression model using stepwise procedures and using the minimum Mallow's CP statistic as criterion for adding variables to...

    Started by johng16‎, 09-20-2006 08:14 PM
    • Replies: 2
    • Views: 26,821
    01-07-2008, 06:58 AM Go to last post
  21. Calculating Omega Squared

    Hi All I have been battling with my stats over the last two months and have managed, by reading books and researching the web, to stumble through...

    Started by 2461c‎, 07-26-2009 06:30 AM
    • Replies: 2
    • Views: 26,792
    07-28-2009, 10:25 AM Go to last post
  22. 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: 26,745
    01-16-2011, 01:24 PM Go to last post
  23. Testing for difference 2 regression models

    Hello, I am working on multiple regressions at the moment and have come to a point that I need a little assistance. I have the following question:...

    Started by devreede‎, 11-28-2008 12:16 PM
    • Replies: 8
    • Views: 26,488
    11-29-2008, 11:29 AM Go to last post
  24. Hierarchical linear modeling Increasing intercept variance component

    I have run 12 hierarchical linear models, where students are nested in their workshop groups for certain university classes. The goal is to explain...

    Started by vawinklz‎, 08-27-2012 12:52 PM
    • Replies: 0
    • Views: 26,398
    08-27-2012, 12:52 PM Go to last post
  25. Multiple regression with non-normal distribution?

    I have some data that I would like to analyse by using multiple regression, as I am interested in the predictive ability of a model (variables...

    Started by judith_sw‎, 06-18-2011 04:58 PM
    • Replies: 7
    • Views: 26,213
    06-19-2011, 04:00 AM Go to last post
  26. Hypotheses testing if R=1

    Dear all, Since the R value of my regression model is one, I can neither conduct a t-test nor a F-test. Is this a problem with regard to...

    Started by yosi‎, 04-09-2014 06:12 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 25,933
    04-11-2014, 02:30 PM Go to last post
  27. near singular matrix error (dummy variable trap)

    Hi, Im running a regression in eviews and have 11 dummy variables for 12 different industries. As i already dropped one i do not understand why i...

    Started by slacknoise‎, 07-27-2012 07:07 AM
    • Replies: 3
    • Views: 25,588
    06-23-2013, 01:54 AM Go to last post
  28. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 25,480
    03-06-2012, 11:39 AM Go to last post
  29. Moderation in Logistic Regression

    Hi, looking at all the other topics, this is a very basic question, but for me it is really a brain cracker.. I have a conceptual model; ...

    Started by km88‎, 05-25-2011 12:25 PM
    • Replies: 9
    • Views: 25,443
    04-04-2012, 05:36 AM Go to last post
  30. F-Statistic Question

    I'm sorry for probably asking a foolish question, but my searches have yielded very limited results (as well as my reading) in regards to the...

    Started by dfrisch‎, 05-28-2008 12:30 PM
    • Replies: 6
    • Views: 25,368
    06-23-2008, 03:28 PM Go to last post
  31. Partial regression plots in R

    Hey guys, I'm slowly converting myself from an SPSS user to an R user. I'm running a pretty basic multiple regression model and want to produce...

    Started by pinkfreud‎, 04-24-2011 11:15 AM
    multiple, partial, plots, regression
    • Replies: 1
    • Views: 24,859
    04-24-2011, 01:39 PM Go to last post
  32. 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: 24,653
    01-26-2016, 11:08 AM Go to last post
  33. calculating multiple regression by hand

    How would you calculate a regression equation such as Y = b1X1 + b2X2 + b3X3 + a by HAND??? I can find in textbooks the way to calculate two...

    Started by HCrazy‎, 11-10-2008 11:52 PM
    • Replies: 1
    • Views: 24,460
    11-11-2008, 12:04 AM Go to last post
  34. Time Series ARIMA(p,d,q) - how to determine what p, d and q equal?

    Hello, I (think) understand that in order to determine the parameter values of an ARIMA(p,d,q) model, I need to look at three things: 1. PACF...

    Started by lancearmstrong1313‎, 08-17-2012 07:05 AM
    • Replies: 3
    • Views: 23,777
    08-21-2012, 07:32 AM Go to last post
  35. Binary Logistic Regression in R

    Warning: this is going to be a long post. Acknowledgement: Thanks to The Ecologist for getting me started on what I hope is the right road. This...

    Started by jerh‎, 12-04-2008 11:10 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 23,734
    12-16-2008, 03:21 AM Go to last post
  36. Compare regression cofficints in 2 models/ same sample, + 1 IV, SPSS

    Dear all, I am doing a master thesis in criminology and am trying to detect confounding effects of response styles on theoretical models....

    Started by Mathis‎, 07-22-2012 06:22 AM
    • Replies: 3
    • Views: 23,734
    07-30-2012, 02:45 PM Go to last post
  37. Interpreting White test for heteroskedasticity

    Hello, i am using Gretl software and run a OLS regression on a set of panel data. I am trying to find out if there is hetereskedasticity in the...

    Started by elkomaro‎, 12-10-2013 06:23 PM
    gretl, heteroskedasticity, white test
    • Replies: 1
    • Views: 23,731
    12-10-2013, 06:49 PM Go to last post
  38. What is LAG (time series question)

    I have heard the term LAG used for time series and sort of have a very basic grasp of it. Could someone please try explaining it (in a very basic...

    Started by lancearmstrong1313‎, 08-13-2012 02:05 PM
    • Replies: 2
    • Views: 23,360
    08-14-2012, 07:50 AM Go to last post
  39. Regression questions

    I have answered the questions below can someone please check them to make sure i have them right. I have answered the questions but need to have...

    Started by CREATIONS‎, 06-27-2008 01:29 AM
    • Replies: 2
    • Views: 23,297
    06-27-2008, 09:27 AM Go to last post
  40. Exclude intercept in logistic regression?

    I would like some help on the subject whether to include the intercept term or not in a logistic regression. I have read that some people say that...

    Started by jockem‎, 12-20-2011 06:25 AM
    • Replies: 7
    • Views: 23,292
    12-21-2011, 04:00 AM Go to last post
  41. [Optimization Solver] Good model fit, but wrong standard deviation coefficients

    Dear reader, I am facing an optimization problem and, at this point, I need help from someone with more knowledge than me. My goal: For a...

    Started by cgmac‎, 04-08-2013 04:54 PM
    excel, non-linear regression, optimization, solver, solvstat
    • Replies: 1
    • Views: 23,021
    04-08-2013, 04:59 PM Go to last post
  42. Three way interactions in regression

    Hi, I'm trying to figure out how to do three-way interactions with multiple regression. I am trying to predict an IV by a three DVs and the...

    Started by sifar16‎, 08-28-2008 03:18 AM
    • Replies: 4
    • Views: 22,773
    03-20-2009, 11:49 PM Go to last post
  43. 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: 22,677
    10-20-2011, 01:33 AM Go to last post
  44. what is cross section regression analysis?

    Can someone help me by defining what is cross section regression analysis and the limits of this. :)

    Started by danswe3‎, 03-29-2011 04:33 AM
    • Replies: 1
    • Views: 22,573
    04-06-2011, 12:40 PM Go to last post
  45. how to calculate the significance of an R2 increase (based only on results in paper)

    Recently I have come across several articles that report OLS results of models with increasing numbers of variables. In the articles the R2 and...

    Started by PeterV‎, 11-16-2011 04:35 AM
    2 Pages
    1 2
    fit summary, model comparison, model selection, regression, significance of reg
    • Replies: 19
    • Views: 22,460
    11-17-2011, 09:27 AM Go to last post
  46. Beta coefficients in multiple regression

    Hi guys. I have a question about beta coefficients that are calculated for standard multiple linear regression procedure. I kind of don't...

    Started by kobylkinks‎, 01-30-2009 04:02 AM
    • Replies: 4
    • Views: 22,370
    10-06-2009, 09:35 AM Go to last post
  47. Interaction effect significant but main effects not

    Hi all, I was wondering if anyone could give me a help with my logit. I have a DV of disease vs. non-disease and 3 IV: dummy-year (year 1 vs year...

    Started by PedroR‎, 04-27-2013 10:11 AM
    • Replies: 12
    • Views: 21,827
    05-06-2013, 01:46 PM Go to last post
  48. Chi square and Wald chi square

    What is the difference between wald chi square test and chi square test in regression analysis?

    Started by najmehjami‎, 06-20-2011 10:49 AM
    • Replies: 2
    • Views: 21,690
    06-20-2011, 01:26 PM Go to last post
  49. Did i get theese right i am confused, can anyone help me please

    25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

    Started by Bicano‎, 11-30-2008 08:26 PM
    • Replies: 2
    • Views: 21,632
    11-30-2008, 09:08 PM Go to last post
  50. Multiple Time Series Regression? Time Series with multiple independent variables

    I've asked a lot about time series in general but perhaps I should be focusing my questions about this: is it possible to do a time series...

    Started by lancearmstrong1313‎, 08-23-2012 12:37 PM
    • Replies: 5
    • Views: 21,606
    09-26-2012, 09:03 AM Go to last post
  51. Relative contribution of variables in logistic regression

    Hi, I have been using logistic regression to determine what influences the chances of a person becoming unemployed. A number of variables have all...

    Started by lmsava‎, 08-22-2011 04:11 PM
    • Replies: 5
    • Views: 21,577
    08-23-2011, 05:18 AM Go to last post
  52. Multiple linear regression: partial F-test

    "Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

    Started by kingwinner‎, 06-18-2009 08:58 PM
    • Replies: 5
    • Views: 21,269
    06-20-2009, 11:32 AM Go to last post
  53. Help understanding Microsoft Excel ANOVA output (Significance F ?)

    Hi, So I created my own very simple excel table, with a set of X and Y values, and then I told Excel to run a regression analysis. ...

    Started by spearchew‎, 05-22-2013 08:29 AM
    • Replies: 8
    • Views: 21,238
    05-23-2013, 12:43 PM Go to last post
  54. Hosmer and Lemeshow Test is significant

    Hi all, can anyone tell me if one can still use a model which reports a H&L test with significant chi-square? (I have a very large sample - + 100...

    Started by PedroR‎, 05-14-2013 06:19 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 21,109
    05-16-2013, 09:49 AM Go to last post
  55. partial r2 vs partial correlation vs stnd coefficients

    Hi all, I have run a few linear regression models predicting water quality for watersheds using explanatory variables such as mean impervious...

    Started by seth‎, 02-11-2011 01:30 AM
    • Replies: 9
    • Views: 21,012
    12-11-2011, 09:02 PM Go to last post
  56. Regression when outcome is a rank?

    Is there a particular kind of regression if the outcome is a ranking? I'm wondering if my best bet would be to use the central limit theorem and use...

    Started by zeloc‎, 12-07-2011 08:06 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 20,922
    12-14-2011, 02:36 PM Go to last post
  57. 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: 20,826
    01-17-2011, 02:32 PM Go to last post
  58. Regression Assumptions for Binary Dependent Variable Models?

    I was wondering if anyone could direct me to a good source on this, or just answer my question directly. What are the assumptions made for a...

    Started by DavidBill‎, 03-04-2011 12:00 AM
    • Replies: 3
    • Views: 19,937
    03-04-2011, 12:20 PM Go to last post
  59. 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: 19,627
    01-09-2011, 09:35 AM Go to last post
  60. Calculations for the unstandardized coefficients for a multiple regression analysis

    I am looking to write a spreadsheet of the calculations for the unstandardized coefficients for a multiple regression analysis (the B values). ...

    Started by Baggies‎, 11-10-2008 03:54 AM
    • Replies: 3
    • Views: 19,617
    11-11-2008, 04:53 AM Go to last post

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