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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Problem with Data analysis on Likert Scale!

    Hello John, Im a student of Business studies and am working on a research project titled as "Impact of Physical environment on Employee...

    Started by Asma Gm‎, 03-26-2008 05:56 AM
    • Replies: 10
    • Views: 16,180
    07-09-2016, 03:44 AM Go to last post
  2. non-significant predictor became significant after including additional predictor?

    Hi everyone, I have a quick question concerning a program I am having in multiple regression. I have a working full mediation model, that is,...

    Started by jiaxiking‎, 01-04-2015 05:55 PM
    • Replies: 10
    • Views: 3,144
    01-05-2015, 09:37 PM Go to last post
  3. Multivariate regression with paired samples?

    Hello, First time poster here. I have data from two groups of people recorded during two different conditions. I would like to study how the...

    Started by mnd‎, 04-02-2013 12:44 PM
    • Replies: 10
    • Views: 11,813
    02-27-2016, 11:51 PM Go to last post
  4. Partial Linear Regression

    I have an S shaped (sigmoid) curve with moderate noise and I need to estimate the slope of the straight line segment around the hypothetical...

    Started by ercolino‎, 08-06-2013 09:09 PM
    • Replies: 10
    • Views: 2,432
    08-27-2013, 06:06 AM Go to last post
  5. Question when to perform a multiple regression test

    I have compared my treatment effect for the 4 variables to see which one was affected. Only one variable changed significantly pre vs. post. Can...

    Started by ApeWorld‎, 07-24-2013 06:44 AM
    • Replies: 10
    • Views: 2,434
    07-25-2013, 05:09 PM Go to last post
  6. Likert scale regression

    I have done a likert type survey ( with 5 point scale) and I am facing problems in analysing the data. following is the situation: Both DV and IV...

    Started by yodadcoda‎, 08-12-2013 03:35 PM
    • Replies: 10
    • Views: 2,345
    08-13-2013, 02:53 AM Go to last post
  7. Regression analysis guy wannabe

    I'm a math guy that's been out of school for 20 years in a non-math career. I'm interested in learning regression analysis, and I'd like to know how...

    Started by attemi‎, 09-30-2013 10:44 AM
    • Replies: 10
    • Views: 2,010
    10-03-2013, 12:11 PM Go to last post
  8. Confidence Intervals for predicted values

    Hu Guys, I hope you could provide hints to put me on the right track. A scholar has devised a device to measure the momentum of inertia (Mi) of...

    Started by gianmarco‎, 10-21-2013 05:02 AM
    • Replies: 10
    • Views: 4,212
    11-05-2013, 01:17 PM Go to last post
  9. ARIMA Modelling

    I'm performing some ARIMA modelling on time series data for UK energy consumption for my dissertation at university. At a bit of a loss though. So...

    Started by Hazbuk‎, 12-12-2013 06:49 AM
    • Replies: 10
    • Views: 2,487
    12-17-2013, 09:47 AM Go to last post
  10. parameter estimate of categorical variable

    I run multiple regression with 2 continuous and 1 categorical variable (3 levels). SAS will hold the last level of the categorical variable and will...

    Started by szm‎, 12-22-2013 06:04 PM
    categorical, interaction, parameter estimation, regression
    • Replies: 10
    • Views: 2,768
    12-23-2013, 10:48 PM Go to last post
  11. Expected Multicollinearity: Alternative to Regression?

    Hello, I currently extracting a lot of slightly different variables from a Social Network dataset, which I want to regress (or something like...

    Started by szidel‎, 01-21-2014 06:17 AM
    • Replies: 10
    • Views: 2,576
    01-21-2014, 11:30 AM Go to last post
  12. 6 factors and a response

    Hello All, I have a spreadsheet with 6 factors and 1 response... i'm not sure if all the factors effect the response but I'm hoping there is a...

    Started by ilikeshirt‎, 07-04-2014 10:54 AM
    • Replies: 10
    • Views: 2,282
    07-08-2014, 10:52 AM Go to last post
  13. Testing whether two related slopes/intercepts are different from each other

    Hi, I'm new and stuck. I want to see if the intercepts and slopes of two linear regression lines are significantly different. I thought I found...

    Started by Proinsias‎, 09-18-2014 08:39 PM
    intercept, intercept p value, linear regression, mancova, significance
    • Replies: 10
    • Views: 2,511
    09-19-2014, 01:43 AM Go to last post
  14. Nonsignificant mediation analysis

    Hello there, first post in this forum. I hope this is the correct subforum, as I have a question regarding psychology statistics, but I am using a...

    Started by nevial‎, 06-07-2015 05:34 AM
    • Replies: 10
    • Views: 1,712
    06-07-2015, 01:28 PM Go to last post
  15. OR improving inmultyvariate logistic regression

    Hi! Does it make sense that odds ratio are getting better (higher) and more significant when moving from a univriate to a multivariate regression...

    Started by Doobdoob‎, 10-19-2015 01:43 PM
    • Replies: 10
    • Views: 1,527
    10-22-2015, 04:03 PM Go to last post
  16. cross-validated AUC

    Hello All, I hope the thread's title makes sense to you. I need to perform internal Cross-Validation using k-fold CV (needless to say, to assess how...

    Started by gianmarco‎, 11-25-2015 02:42 AM
    • Replies: 10
    • Views: 2,246
    11-27-2015, 03:32 PM Go to last post
  17. MSE RMSE for Modeling/Technique Examination

    I have heard people talking about creating the best modeling approach, best propensity scores, best approach for dealing with missing data, etc. -...

    Started by hlsmith‎, 01-13-2016 02:08 PM
    • Replies: 10
    • Views: 2,236
    06-28-2016, 03:14 PM Go to last post
  18. Should you use Bonferonni for regression

    It is common to generate many models in regression and only report the final one. To me this suggests that you should use some correction like...

    Started by noetsi‎, 01-30-2016 02:52 PM
    • Replies: 10
    • Views: 1,806
    02-01-2016, 10:37 AM Go to last post
  19. Angry Violation of linearity assumptions - binary logistic regression - what to do?

    I am running a binary logistic regression with SPSS and unfortunately the assumption of linearity (Box-Tidwell procedure) are not met for the...

    Started by beatoctane‎, 05-22-2016 05:18 AM
    • Replies: 10
    • Views: 2,441
    05-26-2016, 01:46 PM Go to last post
  20. Interpreting residuals

    Still getting used to interpreting large numbers of data points for regression assumptions. The attached looks fan shaped to me, which it is said...

    Started by noetsi‎, 06-09-2016 01:42 PM
    • Replies: 10
    • Views: 3,232
    08-01-2016, 08:16 AM Go to last post
  21. comparing extremes of an independent variable

    Dear all, I have been cracking my head for 2 weeks but i havent been able to figure out this, so i decided to ask for help. I have done a...

    Started by niccolo‎, 08-04-2016 03:54 AM
    • Replies: 10
    • Views: 1,564
    08-04-2016, 07:18 PM Go to last post
  22. Which forecast method for a time series like this one?

    Hi everyone, I do have a time series composed by 45 monthly observations and I am trying to figure out which kind of forecasting method is best...

    Started by Mark_‎, 10-11-2016 10:05 AM
    • Replies: 10
    • Views: 3,112
    01-31-2017, 05:36 PM Go to last post
  23. Heteroscedastcty with large number of cases

    I ignore here that I have populations commonly :p I have heard that heteroscedastcity is not an issue when you have large sample sizes (I have ten...

    Started by noetsi‎, 10-14-2016 10:45 AM
    • Replies: 10
    • Views: 2,716
    10-17-2016, 01:21 PM Go to last post
  24. Significance Issue in Regression

    Hi everyone! I have a statistical question that I hope someone can answer. I am doing a research about relationship between satisfaction and...

    Started by Mikica‎, 08-26-2007 07:14 AM
    • Replies: 9
    • Views: 3,903
    08-29-2007, 03:17 PM Go to last post
  25. Dissertation help with Likert scale

    Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

    Started by Bunecarera‎, 04-15-2008 05:28 AM
    • Replies: 9
    • Views: 11,532
    04-16-2008, 01:27 PM Go to last post
  26. Cool Multiple Regression with Multiple Groups

    Hello, I am looking at predictor variables (scores on partner perception measures) on a criterion variable (relationship satisfaction), in order to...

    Started by Shadow3758‎, 11-26-2008 05:35 PM
    • Replies: 9
    • Views: 5,630
    11-26-2008, 06:58 PM Go to last post
  27. Hlm?

    I am working with a large data set, n = 1200+ average course grades culled from over 15,000 students from a school. I ran a regression using average...

    Started by ewblack‎, 12-09-2008 01:23 PM
    • Replies: 9
    • Views: 4,873
    12-17-2008, 12:21 PM Go to last post
  28. So many variables--how to approach this?

    I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

    Started by brooklynqueen‎, 08-10-2010 10:31 PM
    • Replies: 9
    • Views: 4,143
    08-11-2010, 05:24 PM Go to last post

    Hi guys, I have a small question. I ran a MANOVA model, with 4 DV's and 1 IV with 2 categories. I got a non significant result, with P. Value of...

    Started by WeeG‎, 09-06-2010 02:55 PM
    • Replies: 9
    • Views: 13,093
    09-07-2010, 03:56 AM Go to last post
  30. 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: 4,436
    11-24-2010, 08:45 AM Go to last post
  31. 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: 18,749
    01-09-2011, 09:35 AM Go to last post
  32. 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: 20,220
    12-11-2011, 09:02 PM Go to last post
  33. 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: 5,857
    02-15-2011, 05:40 PM Go to last post
  34. Prediction Region/Set from Multiple Logistic Regression

    Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

    Started by chaps‎, 05-25-2011 04:24 AM
    • Replies: 9
    • Views: 4,895
    06-11-2011, 12:54 AM Go to last post
  35. 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: 24,645
    04-04-2012, 05:36 AM Go to last post
  36. Help with Regression Analysis

    It's been a while since I've done a regression analysis. I'm trying to run a multivariate regression analysis in Excel to determine whether or not...

    Started by cglinn‎, 07-12-2011 09:31 AM
    • Replies: 9
    • Views: 4,286
    07-12-2011, 04:34 PM Go to last post
  37. What regression methods to study?

    I am currently putting in a proposal for an independent study course in the summer in regression. Part of it is which regression methods and...

    Started by noetsi‎, 10-24-2011 11:31 AM
    • Replies: 9
    • Views: 2,545
    10-24-2011, 03:49 PM Go to last post
  38. t-test for categorical predictors in regression WRONG!?

    hey people... so i am sitting in my theory of GLMs class... and the prof just said something i had never ever heard in my life... which is that, in...

    Started by spunky‎, 10-26-2011 12:16 PM
    • Replies: 9
    • Views: 4,301
    10-26-2011, 01:08 PM Go to last post
  39. Categorical variables and interaction in MLR

    Would it be correct, to add in multiple linear regrression interaction between two categorical variables (i transformed them - dummy variavles) with...

    Started by Myron Tsisinskiy‎, 11-18-2011 04:40 AM
    categorical vairable, interaction term, multiple regression
    • Replies: 9
    • Views: 3,364
    11-19-2011, 04:14 PM Go to last post
  40. 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: 7,181
    12-21-2011, 09:38 AM Go to last post
  41. (Li'l) theoretical question about correlations in regression...

    hey y'all people!??! how're y'all doooin' huh? i hope everyone had the most awesomest holidays!!! heh. so... who else is feelin' the pinch this...

    Started by spunky‎, 01-08-2012 02:09 PM
    • Replies: 9
    • Views: 3,132
    01-09-2012, 02:44 AM Go to last post
  42. 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: 4,453
    01-12-2012, 08:05 PM Go to last post
  43. F-Test Interpretation and Log-Linear?

    Hey. I have found this a very difficult subject to self-teach and unfortunately I have not found my teachers particularly helpful. Sorry about the...

    Started by Jak‎, 04-16-2012 02:10 PM
    • Replies: 9
    • Views: 4,286
    04-27-2012, 01:40 PM Go to last post
  44. Exclamation Help! my model isn't predicting any yes outcomes and don't know why

    I am producing a logistical regression analysis to find a model to predict whether someone has minor mental health problems or not. I'm almost...

    Started by el89‎, 04-19-2012 08:58 PM
    help me!, logisitic regression, prediction errors, predictive model, regression analysis
    • Replies: 9
    • Views: 2,044
    04-20-2012, 02:57 AM Go to last post
  45. How to avoid collinearity in regression

    Hi there, I am new in statistics so my question will be a bit naive. When I perform regression, some variables are excluded. It is, maybe, because...

    Started by AsoInfo‎, 09-05-2012 01:22 AM
    • Replies: 9
    • Views: 5,546
    09-09-2012, 06:57 AM Go to last post
  46. Time Series - Differencing the data

    I'm still trying to teach myself time series and have a bunch of questions about differencing the data. I would be super appreciative if anyone could...

    Started by lancearmstrong1313‎, 08-20-2012 01:32 PM
    • Replies: 9
    • Views: 9,250
    09-17-2012, 12:46 PM Go to last post
  47. Interpretation of estimated coefficients

    Started by TrueTears‎, 08-30-2012 11:10 AM
    • Replies: 9
    • Views: 7,403
    08-30-2012, 02:24 PM Go to last post
  48. Are my residuals normal?

    Hi there, I have performed a multiple regression analysis and am checking the assumptions. The normal probability plot is not exactly a straight...

    Started by bradyj2‎, 09-05-2012 08:01 AM
    • Replies: 9
    • Views: 2,214
    09-05-2012, 06:17 PM Go to last post
  49. Question on Finding the Design Matrix

    For the above question, I was wondering if someone could help me find the design amtrix in question a) It seems like from the question tat there...

    Started by chrishello‎, 09-18-2012 08:05 AM
    • Replies: 9
    • Views: 3,547
    09-18-2012, 10:49 AM Go to last post
  50. Mediation Analysis- What does zero means?

    Hi Can I check if my understanding of mediation analysis is correct. For example, I have found the ab (indirect effect) is 0.01, can I assume...

    Started by v.codec‎, 09-22-2012 09:28 AM
    • Replies: 9
    • Views: 2,874
    10-18-2012, 05:03 PM Go to last post
  51. Are these models nested?

    I have three logistic regression models. Model 1 is the reference model with covariates GA + BW. Model 2 is a quadratic model with GA + BW +...

    Started by SiBorg‎, 11-11-2012 06:22 AM
    • Replies: 9
    • Views: 3,740
    11-11-2012, 04:37 PM Go to last post
  52. Logistic Regression Skewed Data with Lots of zeros!

    Hello, I am working on a Logistic Regression where the results that I am getting are not satisfactory. The hosmer and lemeshow test is being...

    Started by Marcio_m_r‎, 04-22-2013 12:17 PM
    • Replies: 9
    • Views: 9,539
    04-24-2013, 05:58 PM Go to last post
  53. 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: 41,578
    02-04-2013, 01:26 PM Go to last post
  54. Multiple regression - assumptions

    Hi, I performed experiments on two plant species, growing them together in mixtures. I repeated this experiment in 4 nutrient concentrations. I...

    Started by joey‎, 03-26-2013 08:58 AM
    • Replies: 9
    • Views: 2,378
    03-28-2013, 06:58 AM Go to last post
  55. Not Significant Coefficients

    I've run a logit regression to estimate the probability of attending high school. I've done this for many years. The thing is that some coefficients...

    Started by chipi-arg‎, 05-23-2013 11:13 AM
    coefficient, logit, significance
    • Replies: 9
    • Views: 2,591
    06-05-2013, 11:29 AM Go to last post
  56. Binomial Logistic Regression - Predicted Probabilities

    Hi. I’m taking my first steps on binomial logistic regression and I was hoping you could help me with some doubts I’m having. My model has a...

    Started by FDFS‎, 05-27-2013 11:15 AM
    • Replies: 9
    • Views: 2,157
    06-05-2013, 08:38 AM Go to last post
  57. Regression Model is Significant but...none of the independent variables are?

    I have a regression Model that is significant but none of the independent variables are? What does this mean? How can i discuss the results? ...

    Started by john_cappa‎, 07-10-2013 08:30 AM
    • Replies: 9
    • Views: 1,910
    07-14-2013, 06:18 PM Go to last post
  58. Several transformation in multiple linear regression to achieve normality

    I am an undergraduate student doing a dissertation on forecasting using multiple linear regression. I am creating a multiple regression equation in...

    Started by jovig18‎, 06-26-2013 02:35 PM
    • Replies: 9
    • Views: 1,514
    06-27-2013, 11:42 AM Go to last post
  59. help determining specifics of binary logistic regression

    I am going to try my best to ask this in the simplest way but with adequate info for someone to have an understanding of my dilemma. I would...

    Started by cratliff01‎, 07-02-2013 10:52 PM
    • Replies: 9
    • Views: 1,661
    07-05-2013, 10:41 PM Go to last post
  60. Rsquared vs Adjusted Rsquared

    Hello, I have a question regarding to rsquare. I have a model with 1 independent variable which I measure with Rsquare and I have a model with 3...

    Started by Denniono‎, 08-22-2013 10:39 AM
    • Replies: 9
    • Views: 2,275
    08-23-2013, 03:58 AM Go to last post

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