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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. help with non-normality issue!

    Thread has already been solved.

    Started by Conni20‎, 06-23-2015 06:13 AM
    • Replies: 3
    • Views: 1,116
    06-23-2015, 06:37 AM Go to last post
  2. general mediation question

    Hi guys Probably the easiest question ever but I can't really wrap my head around it. The setup of the research is as follow: X and M =...

    Started by Conni20‎, 06-27-2015 09:14 AM
    • Replies: 1
    • Views: 1,304
    06-27-2015, 04:22 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: 7,508
    03-21-2011, 01:49 AM Go to last post
  4. Statistical significance in linear vs logistic regression

    Hey all, I'm running a multiple linear regression with a continuous Y variable and five continuous X variables (including a continuous-continuous...

    Started by constantly‎, 04-30-2011 12:59 PM
    • Replies: 0
    • Views: 1,969
    04-30-2011, 12:59 PM Go to last post
  5. Tolerable Heteroskedasticity/ Variance Inhomogenity

    Hello, a long time ago I have read somewhere, that a regression can overcome heteroskedasticity/ variance inhomogenity up to certain amount. It...

    Started by consuli‎, 03-26-2015 07:28 AM
    • Replies: 2
    • Views: 1,596
    03-29-2015, 02:23 PM Go to last post
  6. Tolerable Serial Correlation/ Auto-Correlation by a Regression Analysis

    Hi, is there a similar rule for the tolerable serial correlation/ auto-correlation by a regression analysis like the maximum-minimum quotient...

    Started by consuli‎, 03-29-2015 02:31 PM
    • Replies: 0
    • Views: 1,178
    03-29-2015, 02:31 PM Go to last post
  7. Error Propagation in Separate Binomial Logistic Regressions

    On http://en.wikipedia.org/wiki/Multinomial_logistic_regression#Introduction is written, that the estimation errors of separate binomial logit models...

    Started by consuli‎, 02-12-2015 03:08 PM
    • Replies: 0
    • Views: 840
    02-12-2015, 03:08 PM Go to last post
  8. How to choose best robust regression model?

    Hello. There are several robust regression methods like LAR-(aka LAV-, LAD-, L1-Norm-)Regression, Quantil-Regression, M-Estimator, ... They are...

    Started by consuli‎, 02-25-2017 08:01 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 4,100
    03-21-2017, 02:05 PM Go to last post
  9. Regression Assumptions for different time series models

    I am reading a non-statistics book at the moment, which writes about statistics. Not a good constellation, I know. Unfortunately I do not have a...

    Started by consuli1‎, 01-08-2014 01:53 PM
    • Replies: 5
    • Views: 1,972
    01-13-2014, 09:41 AM Go to last post
  10. Derivation of t-test for regression coefficient

    Hello, at the moment I am researching, if the t-statistic is appropriate for a significance test of the regression coefficient on a dummy...

    Started by consuli1‎, 12-26-2013 06:33 PM
    • Replies: 4
    • Views: 2,287
    12-28-2013, 12:36 PM Go to last post
  11. Degrees of Freedom in case of multiple regression?

    What does dof of each predictor show in case of multiple regression? Instead of explaining mathematically, could anyone explain the physical...

    Started by convivial‎, 07-19-2010 06:41 AM
    • Replies: 3
    • Views: 4,392
    07-19-2010, 10:21 AM Go to last post
  12. Sum of Residual equal to zero

    I want to know why when you multiply the residual by Y_hat the sum of this new equation is still zero? So in other words I have summation from 1...

    Started by Cookie‎, 08-05-2011 09:49 PM
    • Replies: 4
    • Views: 10,290
    08-07-2011, 11:17 PM Go to last post
  13. Variance of error

    With the equation yi = B0 + B1xi + ei Does anyone know what the variance of ei_hat is suppose to equal? So far I have tried to split it the ei...

    Started by Cookie‎, 08-08-2011 01:15 AM
    • Replies: 0
    • Views: 3,287
    08-08-2011, 01:15 AM Go to last post
  14. Least square estimates

    (y1, x1)...(yn, xn) and (w1,x1),.....(wn,xn) are independent oberservations where x1...xn are fixed constants. Suppose we fit the first model yi = a1...

    Started by Cookie‎, 08-22-2011 02:51 AM
    • Replies: 3
    • Views: 5,234
    08-22-2011, 11:49 PM Go to last post
  15. Covariance of residual

    I'm given the mutiple regression equation Y = XB + e I have to find the covariance between e_hat and Y First what I did was changed e_hat =...

    Started by Cookie‎, 09-03-2011 08:52 PM
    • Replies: 0
    • Views: 3,682
    09-03-2011, 08:52 PM Go to last post
  16. Multiple Regression Analysis

    Hi there, i would need some advice with regards to Multiple regression. Hopefully i have done the analysis in SPSS correctly. I would like to...

    Started by cookies8‎, 10-08-2006 04:08 AM
    • Replies: 1
    • Views: 3,544
    10-08-2006, 05:46 PM Go to last post
  17. Appropriate Statistical Method :: Nonlinear Dynamic System Identification

    Hey, I should probably mention beforehand, that I am relatively new to statistics. My problem is the following: I am doing nonlinear dynamic...

    Started by Coooky‎, 08-06-2011 08:31 AM
    • Replies: 0
    • Views: 1,600
    08-06-2011, 08:31 AM Go to last post
  18. An easy question about Generalized Linear Model

    Hello everyone, I just started using GLM and was stuck by an easy question of GLM. If I already obtain the estimates of the parameters, let's...

    Started by copyfriend‎, 07-18-2011 01:11 PM
    • Replies: 4
    • Views: 2,366
    07-18-2011, 02:02 PM Go to last post
  19. Country Variable

    Hi Stata Experts, I have a question concerning an idea for my thesis. I have firm-specific data (assets, sales, income etc.) for different firms...

    Started by corazon92‎, 10-11-2016 08:27 AM
    • Replies: 0
    • Views: 1,097
    10-11-2016, 08:27 AM Go to last post
  20. Multivariate Poisson regression

    I have a linear model y=Ax where y and x are vectors and A is a matrix. The dimensionality of y is more than that of x. Further y has Poissonian...

    Started by cordovan66‎, 07-07-2010 05:07 PM
    • Replies: 2
    • Views: 4,864
    07-08-2010, 03:06 PM Go to last post
  21. Question Adaptive Lasso and CrossValidation for SNV selection

    Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

    Started by CorentinR‎, 12-13-2016 07:29 AM
    adaptive-lasso, cross-validation, high throughput, variable selection
    • Replies: 3
    • Views: 2,739
    12-13-2016, 11:51 AM Go to last post
  22. Exclamation Regression & Predictions

    I have a problem to work out involving forecasting/predicting: Given multiple data sets (variables), I need to evaluate which set is the best...

    Started by corrinebean‎, 11-25-2007 07:15 PM
    • Replies: 1
    • Views: 2,986
    11-26-2007, 04:10 AM Go to last post
  23. How to improve regression fit, if I know that certain data points have an error

    Dear all I am encountering a problem in my regression analysis with 1 independent and 1 dependent variable. In my plots, there are certain points...

    Started by Corsa‎, 03-26-2014 03:36 AM
    • Replies: 1
    • Views: 843
    03-26-2014, 08:30 AM Go to last post
  24. Multiple Regression with Ratio as Independent Variable

    I am doing a multiple regression and want to use a ratio (number of support staff to number of students) as an independent variable. Does dividing...

    Started by CounselorHenry‎, 04-24-2016 09:48 PM
    independent variable, multiple regression, ratios
    • Replies: 0
    • Views: 908
    04-24-2016, 09:48 PM Go to last post
  25. same variable: Single regression not stats sig but multiple regression stats sig?

    Evening, IMy statistical query is that I am conducting a multiple regression ( step down - ommitting the non significant variables one by one). I...

    Started by cousmathematics‎, 11-08-2011 12:00 PM
    • Replies: 2
    • Views: 3,949
    11-09-2011, 04:44 AM Go to last post
  26. Bootstrapping regression coefficients - count DV

    Hi folks, I'm trying to plan some analyses for a project assessing how well some subscales measuring various facets of self-control (arguably...

    Started by CowboyBear‎, 05-16-2011 10:06 PM
    • Replies: 0
    • Views: 3,075
    05-16-2011, 10:06 PM Go to last post
  27. 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: 90,811
    12-21-2015, 02:02 PM Go to last post
  28. Interaction between time and time-varying between-subjects variable

    I'm struggling with how to think about a question that seems like it should be really straightforward. I have some survey data about regrets...

    Started by CowboyBear‎, 07-31-2014 05:52 PM
    • Replies: 6
    • Views: 1,545
    08-01-2014, 05:35 PM Go to last post
  29. Bayesian GLM with missing data

    Just while I'm on a roll with simple questions... I'm using MCMCregress {MCMCpack} to do a Bayesian regression in R. My dataset has a good chunk...

    Started by CowboyBear‎, 07-31-2014 06:57 PM
    • Replies: 3
    • Views: 1,981
    07-31-2014, 09:23 PM Go to last post
  30. Assumptions of Linear Regression and Time Series

    Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

    Started by cozgenc‎, 01-18-2012 08:20 AM
    • Replies: 1
    • Views: 9,418
    01-18-2012, 12:05 PM Go to last post
  31. Which one to use? Multiple Regression or Structured Equation Modeling

    I am in the process of writing my dissertation. I have a question about statistical method. My study is to analyze the factors that affect...

    Started by cozycorner‎, 07-24-2013 07:31 PM
    • Replies: 2
    • Views: 1,221
    07-25-2013, 09:14 AM Go to last post
  32. Hierarchical regression for a complex model

    So I am testing my own model but it is more complex than I have dealt with before. I know I need hierarchical regression, and I'm using SPSS (I have...

    Started by cp349‎, 08-21-2015 03:45 PM
    hierarchical, mediators, model, moderators, regression
    • Replies: 0
    • Views: 847
    08-21-2015, 03:45 PM Go to last post
  33. [Stata - Regression with categorical variables correlated] Multicollinearity

    Hello! I'm currently working on my thesis and I have a problem. I'm doing a regression where many variables are categorical ones (profession,...

    Started by cquetstr‎, 06-20-2014 06:16 AM
    categorical variables, regression, stata 11
    • Replies: 5
    • Views: 3,212
    06-21-2014, 08:25 AM Go to last post
  34. Dfbeta for categorical/dummy variables

    Hello :) In my regression analysis (in Stata), I'm generating dfbetas. Can we take into account dfbeta of categorical or dummy variables higher...

    Started by cquetstr‎, 06-23-2014 08:43 AM
    categorical variables, dfbeta
    • Replies: 0
    • Views: 3,255
    06-23-2014, 08:43 AM Go to last post
  35. Missing terms in Logistic Regression

    I'm running a model that contains three treatments (control, proceduralcontrol, and treatment) and three feeding levels (nofeeding, chum, satiation)....

    Started by craigpoconnell11‎, 12-04-2012 09:01 PM
    • Replies: 0
    • Views: 1,101
    12-04-2012, 09:01 PM Go to last post
  36. glm in R - coding issue

    Dear all, I have been attempting to use a generalized linear model in R to determine if any variation existed between the different feeding...

    Started by craigpoconnell11‎, 12-04-2012 12:11 PM
    • Replies: 2
    • Views: 4,299
    12-04-2012, 02:22 PM Go to last post
  37. Validity of setting constant to zero

    Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? For example, I have been...

    Started by craigpollard‎, 05-06-2009 01:31 AM
    • Replies: 0
    • Views: 2,339
    05-06-2009, 01:31 AM Go to last post
  38. Asymmetric confidence bands in nonlinear regression

    Hi, I would like to know the formula for asymmetric confidence bands in nonlinear regression. Figure 6 on this webpage is exactly what I'm looking...

    Started by craigsooman‎, 10-19-2011 02:43 PM
    • Replies: 0
    • Views: 2,544
    10-19-2011, 02:43 PM Go to last post
  39. simplified version of earlier post about contrasting output in binary reg &outliers

    I have conducted binary regression analysis for a single variable dummy coded into 15 dummy variables. My sample size was 512. My dissertation...

    Started by cratliff01‎, 07-08-2013 01:35 AM
    • Replies: 0
    • Views: 954
    07-08-2013, 01:35 AM Go to last post
  40. need help on contrasting outputs for blr enter vs stepwise and outliers

    Hi Again! I am fairly new to stats and have come a long way. I have asked a few questions and this forum has been great for input, thanks! I have...

    Started by cratliff01‎, 07-07-2013 03:17 PM
    • Replies: 0
    • Views: 1,355
    07-07-2013, 03:17 PM Go to last post
  41. 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: 1,657
    07-05-2013, 10:41 PM Go to last post
  42. binary logistic regression using forward lr method in SPSS 21

    Hello! I am brand new to all of this, including this forum - and statistics don't come naturally to me. I have just finished chapter 4 of a...

    Started by cratliff01‎, 06-29-2013 10:20 PM
    • Replies: 0
    • Views: 3,739
    06-29-2013, 10:20 PM Go to last post
  43. How to find beta in a regression model?

    Dear all, This might be a silly question, however I am a newbie when it comes to Stats. Im currently writing my thesis and for this I am analysing...

    Started by crazyaboutstats‎, 01-26-2014 05:03 PM
    • Replies: 11
    • Views: 3,555
    01-28-2014, 01:07 PM Go to last post
  44. Specific and common variables

    Hello! I'm trying to build a regression model for forecasting. The problem is that some parameters, are common for all observations and one of them...

    Started by crazyfrogspb‎, 05-03-2013 08:57 AM
    • Replies: 5
    • Views: 1,907
    05-06-2013, 12:08 PM Go to last post
  45. Question help with different sample size contrast matrix in linear regression

    Hi everyone, I am very confused about the contrast matrix, could some one explain a little bit for me? Or could you please give a link or book...

    Started by crazyhottommy‎, 07-03-2014 09:04 PM
    • Replies: 0
    • Views: 760
    07-03-2014, 09:04 PM Go to last post
  46. Importance of Normality Assumption for Hypothesis testing methods

    Hello everyone! Can someone please share their thoughts on the following question with me. Methods of hypothesis testing usually has a...

    Started by CrazyST‎, 12-12-2013 08:57 PM
    difference of means, normality, regression analysis
    • Replies: 1
    • Views: 1,796
    12-13-2013, 09:15 AM Go to last post
  47. 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: 22,914
    06-27-2008, 09:27 AM Go to last post
  48. Comparing relative importance within a subsample.

    Hey everyone, I was wondering if there was a statistical technique that allowed you to compare the differences in effect sizes across two...

    Started by CRIM‎, 09-06-2012 01:52 PM
    • Replies: 0
    • Views: 973
    09-06-2012, 01:52 PM Go to last post
  49. chemical analysis

    Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

    Started by crimelist‎, 03-10-2016 02:44 AM
    • Replies: 13
    • Views: 2,008
    03-10-2016, 11:56 AM Go to last post
  50. Alcoolimetric Table

    Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

    Started by crimelist‎, 05-20-2016 09:10 AM
    • Replies: 0
    • Views: 1,229
    05-20-2016, 09:10 AM Go to last post
  51. Still a count variable?

    First off, I hope this is the right forum. I'm not sure which other one would be more appropriate for the question. I have a dependent variable...

    Started by crimsonandclover‎, 12-10-2012 05:15 AM
    • Replies: 6
    • Views: 2,062
    12-11-2012, 07:22 AM Go to last post
  52. An R question about GLM

    I want to predict a set of proportions from a linear regression using glm in R. The model has a logit link but I want extract the variance-covariance...

    Started by crispin‎, 02-24-2011 04:36 AM
    r logit
    • Replies: 0
    • Views: 2,188
    02-24-2011, 04:36 AM Go to last post
  53. regression analysis with non normal residuals

    I am a relative novice at stats so I would appreciate any help on this. Please let me know if I need to provide any more info to answer the question....

    Started by crispin‎, 03-04-2011 09:55 AM
    • Replies: 0
    • Views: 3,523
    03-04-2011, 09:55 AM Go to last post
  54. fit an ARIMA-model with t -distributed innovation terms

    Hello, I have to fit an ARIMA-model with t -distributed innovation terms (skew-t) with software R. If I use arima function (package "stats") I...

    Started by cristal‎, 01-22-2016 10:41 AM
    • Replies: 0
    • Views: 842
    01-22-2016, 10:41 AM Go to last post
  55. Predicting rare events using weight-adjusted logistic regression

    This is a simulation study I adapted from sas website. Suppose my probably follows the following relationship, x=rannor(12342); ...

    Started by CRNZNH‎, 12-08-2012 12:37 AM
    • Replies: 2
    • Views: 4,102
    04-09-2014, 02:26 PM Go to last post
  56. Struggling with regression analysis

    Hi guys, I'm new to stats and I'm new on here! I have a homework question that I do not understand. A multiple regression, 3 explanatory...

    Started by croddo‎, 08-04-2013 02:46 PM
    • Replies: 1
    • Views: 2,572
    08-04-2013, 04:42 PM Go to last post
  57. How to investigate a curvilinear relationship? (power curve?)

    Hi there, Can anyone tell me how to explore this relationship on SPSS using a regression analysis? I have been advised that this relationship...

    Started by crook‎, 01-19-2017 01:01 PM
    • Replies: 13
    • Views: 2,925
    01-19-2017, 11:57 PM Go to last post
  58. stronger beta in multivariate than in univariate regression?

    Hi, I have a problem interpretig univariate vs multivariate regression. I have a dependent variable and want to analyze what factors independently...

    Started by crudo‎, 10-31-2013 08:00 AM
    • Replies: 1
    • Views: 4,503
    10-31-2013, 08:04 AM Go to last post
  59. Need my answers checked.. Am I right? Fingers crossed : )

    Hey everyone, tomororw morning I am doing a statisctics exam but I had a few questions before I go in there. I have been reviewing the slides from...

    Started by crunchy‎, 05-15-2007 06:00 PM
    • Replies: 0
    • Views: 2,215
    05-15-2007, 06:00 PM Go to last post
  60. Solve for the following values

    I need to solve for a,b,c,d by hand showing calculations but I can't seem to find any equations that will help me here. We haven't been given any...

    Started by crusoe‎, 03-10-2011 07:33 PM
    • Replies: 4
    • Views: 2,569
    03-11-2011, 01:50 PM Go to last post

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