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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regression Misconceptions

    Dear all, Just wanted to clear some misconceptions I have about regression analysis. Your help would be highly appreciated :) 1) One of the...

    Started by majortom88‎, 04-19-2016 03:44 PM
    • Replies: 1
    • Views: 294
    04-19-2016, 04:17 PM Go to last post
  2. Question Factor scores as independent variables in multiple regression

    I'm checking that I have understood this right. Factor scores must be achieved via oblique rotation, because factor scores must be allowed to...

    Started by zxc‎, 04-19-2016 12:25 PM
    • Replies: 0
    • Views: 254
    04-19-2016, 12:25 PM Go to last post
  3. Question Graphically check linearity in logit regression

    Hi all, I am running a logit regression where the outcome variable is binary. I am interested in checking, graphically, whether the relationship...

    Started by Phaedrus‎, 07-21-2014 08:50 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 4,943
    04-19-2016, 11:59 AM Go to last post
  4. Can covariates be random variables? (logit)

    Hi Everyone. I have been discussing a project at work. My colleague said that he is going to estimate a logit model and include as a covariates...

    Started by harel‎, 04-17-2016 06:50 AM
    • Replies: 5
    • Views: 533
    04-18-2016, 06:32 PM Go to last post
  5. Confounder confounds at only one level of polytomous variable

    Hello! I have looked for a post on this but have been unsuccessful. It would be great if you could help. I am using logistic regression in SAS. ...

    Started by rkw‎, 04-16-2016 07:35 PM
    confounding, polychotomous, polytomous
    • Replies: 0
    • Views: 254
    04-16-2016, 07:35 PM Go to last post
  6. Question about dummy variables

    Hi Guys, So I am doing a project for a class, and had a question on how to interpret something on my SPSS. I am designing a multivariate regression...

    Started by patslee6‎, 04-16-2016 11:47 AM
    • Replies: 0
    • Views: 334
    04-16-2016, 11:47 AM Go to last post
  7. Using weights in regression

    I don't really understand this argument. I thought you had to use weights in regression always when you were not randomly sampling. But this argues...

    Started by noetsi‎, 04-15-2016 01:37 PM
    • Replies: 2
    • Views: 418
    04-15-2016, 03:12 PM Go to last post
  8. Is correction for attenuation in my regression analysis necessary?

    Hi everyone, I'd like to know if I should consider a correction for attenuation in a multiple regression I'd like to run on my data. Here's...

    Started by majortom88‎, 04-11-2016 02:53 PM
    • Replies: 7
    • Views: 674
    04-15-2016, 05:39 AM Go to last post
  9. Relative impact of predictors in linear regression

    I want to rank variables from most to least important, in terms of impact on the DV. My predictors are either interval or dummy. My DV is interval. I...

    Started by noetsi‎, 04-11-2016 12:08 PM
    • Replies: 8
    • Views: 713
    04-14-2016, 10:02 AM Go to last post
  10. Generating random estimates

    I have 5 years worth of actual monthly data. I want to "predict" (examine really) possible values 12 months into the future. I don't want to be...

    Started by fred3‎, 04-13-2016 04:55 PM
    • Replies: 0
    • Views: 275
    04-13-2016, 04:55 PM Go to last post
  11. Seemingly unrelated regression in R with many variables

    Hey! I'm sitting here with a data frame with over 100 variables and I'm supposed to model my 8 dependent variables with seemingly unrelated...

    Started by JagarSUR‎, 04-13-2016 08:08 AM
    • Replies: 0
    • Views: 301
    04-13-2016, 08:08 AM Go to last post
  12. A purely conceptual question

    Assume a logisitc regression model includes a continuous variable like age and a categorical variable like gender and an interaction term for these. ...

    Started by gmcbeen‎, 04-12-2016 06:30 PM
    • Replies: 0
    • Views: 343
    04-12-2016, 06:30 PM Go to last post
  13. Comparison of regression coefficients between (nested) geographic regions

    Hi All, I would like to compare the effect of an explanatory variable (say X1) on a response variable (Say Y) between two geographic regions in...

    Started by arun‎, 04-11-2016 09:54 PM
    comparison, regression, standardization
    • Replies: 0
    • Views: 341
    04-11-2016, 09:54 PM Go to last post
  14. Is this a sensible approach for a 3x3 factorial experiment?

    Hi all I'm hoping that someone can let me know whether this is a suitable approach for analysing a dataset. I have a 3x3 factorial design, so 2...

    Started by t.jones‎, 04-08-2016 05:07 AM
    • Replies: 0
    • Views: 574
    04-08-2016, 05:07 AM Go to last post
  15. Effect Size in Poisson Reg with a Binary Predictor

    Well, I don't regularly come across count variables as dependent variables. What is the best effect size to report for a Poisson reg model with a...

    Started by hlsmith‎, 04-07-2016 12:12 PM
    • Replies: 2
    • Views: 434
    04-07-2016, 02:26 PM Go to last post
  16. Help with a simple linear regression with a huge backlog of data

    Hi there. I am trying to run a regression that will help me predict Y from X. While this is pretty simple and I have done it already, I have many...

    Started by karan13‎, 04-06-2016 11:09 AM
    • Replies: 1
    • Views: 395
    04-07-2016, 08:16 AM Go to last post
  17. Compare coefficients of two regression models

    Hi, I have a little problem I hope someone can help me with. I run 2 multiple regression models with the same independent variables but...

    Started by Swag1992‎, 04-07-2016 05:15 AM
    • Replies: 1
    • Views: 242
    04-07-2016, 08:10 AM Go to last post
  18. low frequency independent variable in logistic regression

    I'm running a logistic regression and I think there's a variable that I'm not treating properly. I'm modeling traffic accidents (1) vs. no...

    Started by kai_squared‎, 04-05-2016 02:45 PM
    • Replies: 6
    • Views: 501
    04-06-2016, 08:06 AM Go to last post
  19. Confused about my Logistic Regression output (SPSS)

    Hi Guys, I've conducted a binary logistic regression using 2 categorical predictors (Static-moving and moving-static) and an outcome variable...

    Started by daveholja‎, 04-05-2016 09:12 AM
    • Replies: 4
    • Views: 383
    04-06-2016, 05:44 AM Go to last post
  20. Information Criterion to compare different linear models

    Dear Community, In order to perform a price forecast, I built four linear models:1-3 have one independent variable, 4 has two independent...

    Started by AntonR‎, 03-30-2016 09:38 AM
    • Replies: 1
    • Views: 351
    04-05-2016, 08:25 AM Go to last post
  21. Multiple Linear Regression Delta R Squared.

    I am conducting a multiple linear regression looking at the predictors of gender and the traits of the dark triad (Narcissism, Psychopathy, and...

    Started by kit191‎, 04-04-2016 09:14 AM
    • Replies: 0
    • Views: 606
    04-04-2016, 09:14 AM Go to last post
  22. coefficient variance decomposition test for multicollinearity

    good day, please assist me in interpreting the results of the coefficient variance decomposition test. i am a bit confused; i think the condition...

    Started by Boi‎, 04-03-2016 02:16 PM
    • Replies: 0
    • Views: 571
    04-03-2016, 02:16 PM Go to last post
  23. Log-Linear

    Hi all, I have a sample data of Mortality vs GDP. I need to make a Log-linear regression analysis. I transformed the data to log scale and then...

    Started by petros20‎, 04-03-2016 08:08 AM
    • Replies: 0
    • Views: 265
    04-03-2016, 08:08 AM Go to last post
  24. Question Multiple Regression

    I'm supposed to analyze data to see if an implementation fee was followed by a change in passenger volumes over a 4 year period. I've started to...

    Started by Avens10‎, 04-02-2016 12:41 PM
    • Replies: 0
    • Views: 402
    04-02-2016, 12:41 PM Go to last post
  25. Robust regression, bootstrapping and indirect effect

    Hi there, I am currently learning to do mediation analysis using bias-corrected accelerated bootstrap confidence intervals, similar to the...

    Started by Tux‎, 04-01-2016 01:26 PM
    • Replies: 4
    • Views: 500
    04-01-2016, 08:55 PM Go to last post
  26. Lightbulb SOS: Linear Regression

    Hi guys, it's a first time I am doing regressions for my dissertation and really need your help. I haven't been studying econometrics before, so I ...

    Started by teo_megre‎, 04-01-2016 08:10 AM
    • Replies: 0
    • Views: 386
    04-01-2016, 08:10 AM Go to last post
  27. Question How to minimize volatility in dataset?

    Hi guys, We are currently struggling with a bit of an issue with regards to multiple regression. It concerns how to deal with substantial...

    Started by DJB86‎, 03-31-2016 10:46 AM
    • Replies: 2
    • Views: 374
    03-31-2016, 01:31 PM Go to last post
  28. Multiple regression with interaction - and dummy variables?

    Hi guys! So, here's the deal. I'm in a bit of a pickle here :shakehead I'm currently struggling with a take-home exam where I'm having trouble...

    Started by DJB86‎, 03-29-2016 09:55 PM
    • Replies: 9
    • Views: 644
    03-31-2016, 10:07 AM Go to last post
  29. Chi Square and Regression

    Hi all, First time post so please go easy on me :p I have a bunch of categorical variables that I am thinking of using as predictor variables...

    Started by Bathy1‎, 03-29-2016 04:09 PM
    • Replies: 3
    • Views: 445
    03-30-2016, 01:18 PM Go to last post
  30. Comparing betas with log transformation of independent variable

    Hi all, I would like to compare the results of three studies. All use linear regression with continuous independent and dependent variables. The...

    Started by orangetrout‎, 03-30-2016 07:35 AM
    • Replies: 0
    • Views: 358
    03-30-2016, 07:35 AM Go to last post
  31. Anova find significant diferrences

    Hi all, I have made an one-way anova in order to test if three populations have the same means. My result is to reject the null hypothesis. So,...

    Started by petros20‎, 03-29-2016 01:43 PM
    • Replies: 4
    • Views: 380
    03-30-2016, 02:17 AM Go to last post
  32. Problem with residual?

    I don't know if this is an issue or not. There are the strange bars on the top and bottom of the residuals - I have never seen anything like this and...

    Started by noetsi‎, 03-29-2016 11:53 AM
    • Replies: 7
    • Views: 370
    03-29-2016, 01:47 PM Go to last post
  33. How to report a non-significant regression?

    Hi guys, For my final year research project, I have a few regression models with non-significant results. I was just wondering what the...

    Started by twinpeaks‎, 03-27-2016 09:38 AM
    • Replies: 4
    • Views: 1,578
    03-29-2016, 04:45 AM Go to last post
  34. Ordinal or Multinomial Regression

    Hi, If I have a variable called time spend following politics with the following possible responses: No time under half an hour a day...

    Started by DGM1‎, 03-28-2016 04:30 AM
    • Replies: 5
    • Views: 487
    03-28-2016, 07:16 PM Go to last post
  35. Logistic regression interpretation

    Can anyone please interpret these results for me i will be highly obliged. Thank you B S.E. Wald Sig. Do you know the doses of every pesticide...

    Started by Farhan‎, 03-26-2016 08:41 AM
    • Replies: 3
    • Views: 435
    03-28-2016, 03:35 PM Go to last post
  36. Basic regressionquestion

    Hi, I am currently learning ML algorithms and implementing in R. I have a some basic questions. 1.)I know that linear regression an statistical...

    Started by chakravarty456‎, 03-28-2016 06:16 AM
    • Replies: 2
    • Views: 365
    03-28-2016, 11:59 AM Go to last post
  37. Instrumental variable approach in case of interacting endogenous predictors

    Hello dear forum members, Suppose I have the following model: y = a + x1 + x2 + z1 + z2 + z1*z2, where y is exponential, x1-x2 are controls,...

    Started by kiton‎, 03-15-2016 01:13 PM
    • Replies: 6
    • Views: 585
    03-26-2016, 01:59 PM Go to last post
  38. How to calculate the percentage contribution in full factorial and RSM models

    Hi, My question might seem quiet straight forward but here it goes: How can I calculate the percentage contribution of each input parameter in...

    Started by khalchris‎, 03-25-2016 09:04 PM
    anova, full factorial, rsm
    • Replies: 0
    • Views: 304
    03-25-2016, 09:04 PM Go to last post
  39. 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 05:08 PM
    2 Pages
    1 2
    odds ratio invertibility, odds ratio less than 1
    • Replies: 18
    • Views: 17,381
    03-25-2016, 04:55 PM Go to last post
  40. Bidirectional relationship with longitudinal data: what's the best model?

    N=1000+. I have about 3-4 repetitive measures of a few numerical variables and categorical variables. How do I test the hypothesis that x...

    Started by neuromniscience‎, 03-23-2016 11:37 AM
    • Replies: 3
    • Views: 414
    03-23-2016, 10:29 PM Go to last post
  41. Low-prevalence covariates in multiple linear regression analysis

    Is there any problem adding low-prevalence covariates to standard multiple linear regression (spontaneous entry)? For example, I have 1000+...

    Started by neuromniscience‎, 03-22-2016 09:59 PM
    • Replies: 2
    • Views: 365
    03-23-2016, 08:59 PM Go to last post
  42. Post Regression individual and group-level data

    Hi all, I'm testing whether observing behavior leads to copying behavior (monkey see, monkey do) in a team setting. I've collected data from...

    Started by Tijnvanlier‎, 03-22-2016 02:50 PM
    • Replies: 3
    • Views: 401
    03-23-2016, 08:40 PM Go to last post
  43. Smile Predicted Probability

    Someone created a spreadsheet to graph predicted provability values on a Logistic Regression S Graph. There are four values used. a = Assumed...

    Started by R0NR0NS‎, 03-22-2016 11:43 AM
    • Replies: 2
    • Views: 327
    03-22-2016, 06:17 PM Go to last post
  44. Post Compare Correlation Coefficients

    Hi everyone, I currently have to do an empirical work in Stata and need some help. I have a regression in this form and want to compare the...

    Started by Swag1992‎, 03-22-2016 12:31 PM
    • Replies: 0
    • Views: 242
    03-22-2016, 12:31 PM Go to last post
  45. Both categorical and continuous predictors?

    I'm sure this is very simple but I just want to be sure. I have actually been searching the web for a while now and can't seem to find a clear...

    Started by dt87‎, 03-21-2016 02:02 AM
    • Replies: 5
    • Views: 554
    03-21-2016, 05:35 PM Go to last post
  46. Question Help with mixed model?

    I would appreciate some help figuring out how to analyze a new data set I'm collecting. Most of my experience is with linear regression and ANOVA,...

    Started by tbrass‎, 03-19-2016 04:49 PM
    • Replies: 3
    • Views: 568
    03-21-2016, 10:52 AM Go to last post
  47. Dummy variables with categorical data with multiple levels.

    This always seemed easy to me, largely because I always had an obvious reference group before or I was dealing with variables that had only 2 levels....

    Started by noetsi‎, 02-28-2016 07:44 PM
    • Replies: 12
    • Views: 1,164
    03-21-2016, 09:13 AM Go to last post
  48. Logistic regression in SPSS

    I have designed a question and now intend to use SPSS to run regression to analyse the results: My dependent variable is: intention to vote. Yes...

    Started by matthewrog‎, 03-19-2016 12:11 PM
    dummy variable, likert scale, logistic regression, ordinal regression, spss
    • Replies: 0
    • Views: 335
    03-19-2016, 12:11 PM Go to last post
  49. Skew in data

    I have a huge data set, 10,000 points is common. I have significant skew in my data and some large outliers. Some authors argue addressing skew with...

    Started by noetsi‎, 03-14-2016 09:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 1,103
    03-18-2016, 06:06 PM Go to last post
  50. "Sensitivty" analysis

    I have not encountered this before. It occurs in the context of "mixed effects OLS regression" (not sure exactly what type of regression that is...

    Started by noetsi‎, 03-18-2016 02:31 PM
    • Replies: 4
    • Views: 491
    03-18-2016, 05:10 PM Go to last post
  51. Intercept becoming negative(More IDVs)

    Hi All, I have a small query. When regressing revenue against cost, my intercept is positive for X% combos where each combo consists of data...

    Started by vikash_124124‎, 03-18-2016 02:57 AM
    • Replies: 6
    • Views: 419
    03-18-2016, 05:08 PM Go to last post
  52. Introductory references about total least squares

    I am an engineering student and I've been recently told about the Total Least Square (TLS) method. I am interested in applying it to topographic...

    Started by julitocolon‎, 03-18-2016 11:14 AM
    least-squares, orthogonal regression, references, regression, total least squares
    • Replies: 1
    • Views: 223
    03-18-2016, 11:37 AM Go to last post
  53. Partial effect plot: Which options do I have?

    Hi, I have a multiple regression model, and I would like to do an effect plot with confidence bands regarding one of the predictors. One solution...

    Started by mmercker‎, 03-16-2016 12:38 PM
    confidence bands, effect plot, regression plot
    • Replies: 4
    • Views: 502
    03-17-2016, 03:21 AM Go to last post
  54. Cool Research Method questions

    Thanks guys for the response, it was great

    Started by jazeid05‎, 03-15-2016 09:29 PM
    • Replies: 3
    • Views: 415
    03-16-2016, 11:29 AM Go to last post
  55. Prediction Plot with CI's: What to do with covariates?

    Hi, I have a multiple regression model (especially a GLMM), with - outcome Y, - a fixed effect predictor wich is in the main focus of...

    Started by mmercker‎, 03-15-2016 06:21 AM
    confidence interval, partial effect, regression plot
    • Replies: 0
    • Views: 254
    03-15-2016, 06:21 AM Go to last post
  56. MSE vs variance of residuals

    Can someone help me understand the distinction between the Mean Square Error and the variance of the residuals i)] in a linear regression? I thought...

    Started by pgseye‎, 03-15-2016 05:28 AM
    • Replies: 0
    • Views: 368
    03-15-2016, 05:28 AM Go to last post
  57. Use of partial regression plots to check for non-linearity

    These are commonly recommended to detect non-linearity in interval level predictors. I ran these in SAS and I have a difficult time interpreting the...

    Started by noetsi‎, 03-11-2016 01:53 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 1,208
    03-14-2016, 04:28 PM Go to last post
  58. Fishing with data: Use of multiple regressions on the same data set

    I have approached this issue, running multiple models with the same data set usually in the context of FW error . It is the habit of running multiple...

    Started by noetsi‎, 03-14-2016 12:31 PM
    • Replies: 2
    • Views: 309
    03-14-2016, 02:25 PM Go to last post
  59. Linear regression vs logistic regression

    I have a time series dataset. The, X (Independent variable) is time and is denoted as 1,2,3,4,5,6..1000.etc Y (Dependent variable ) is a...

    Started by Mukund‎, 03-12-2016 09:54 AM
    linear regression, logistic regression
    • Replies: 2
    • Views: 517
    03-14-2016, 09:28 AM Go to last post
  60. Test of non-linearity

    How do you actually test for non-linearity in linear regression. I have heard Box-Tidwel test mentioned, but I have yet to find out how you do it. ...

    Started by noetsi‎, 03-11-2016 09:27 AM
    • Replies: 0
    • Views: 313
    03-11-2016, 09:27 AM Go to last post

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