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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Regression results

    Hello! I need help with the results of regression analysis. I have significant percentage of variance explained (not big, only 5%), but none of...

    Started by Leyla‎, 03-20-2011 05:08 AM
    • Replies: 3
    • Views: 2,903
    03-20-2011, 04:43 PM Go to last post
  2. Need help on regression

    I am doing a regression analysis. One one side, independent, I have treatment days/fractions and on other side, dependent, i have a measure of...

    Started by statsdoc1‎, 03-16-2011 08:51 AM
    fixed intercept
    • Replies: 4
    • Views: 2,895
    03-18-2011, 10:36 AM Go to last post
  3. coding for dummy variable

    Hello all, I am wondering why dummy variables should always be coded either 0 or 1. For example, does it make any mathematical difference in...

    Started by luic‎, 03-17-2011 02:05 AM
    • Replies: 2
    • Views: 5,708
    03-17-2011, 07:26 AM Go to last post
  4. logistic regression results

    dear all, I've been using the logistic regression for my data. Let's just say I'm predicting the possibility of A or B. I use four predictors, one...

    Started by md_siburian‎, 03-17-2011 06:38 AM
    logistic regression
    • Replies: 0
    • Views: 1,957
    03-17-2011, 06:38 AM Go to last post
  5. Linear regression, nonlinear regression or something else?

    Hi! I do apologies in advance for any misuse of terms or the lack of understanding in statistics - as I've only realised, after Googling for hours,...

    Started by elispene‎, 03-16-2011 10:56 PM
    • Replies: 0
    • Views: 3,622
    03-16-2011, 10:56 PM Go to last post
  6. Logistic regression - help please!

    Hello, I was wondering if there are any kind souls out there who might be able to help me with a problem I am having with logistic...

    Started by sjh83‎, 03-13-2011 07:37 AM
    • Replies: 2
    • Views: 2,621
    03-16-2011, 09:38 PM Go to last post
  7. regression analysis with an infinite number of predictors....

    so i was reading this article and kinda got me wondering... for standard, OLS multiple regression... can we have an infinite number of...

    Started by spunky‎, 03-13-2011 11:19 PM
    • Replies: 2
    • Views: 3,462
    03-16-2011, 03:30 PM Go to last post
  8. Linear Regression - Theory

    Hi Guys, I have some theoretical questions about regression models, I need an answer or true or false for the next few phrases.... 1. Leverage...

    Started by WeeG‎, 03-15-2011 05:47 AM
    • Replies: 3
    • Views: 3,389
    03-16-2011, 03:16 AM Go to last post
  9. Multi-Level Models with perfectly correlated outcomes

    Hello, I am trying to utilize multilevel regression analysis in SPSS (mixed models) to predict outcomes in negotiations between two individuals....

    Started by Lars Norén‎, 02-26-2011 08:55 PM
    • Replies: 3
    • Views: 2,867
    03-15-2011, 05:39 AM Go to last post
  10. regression + ANOVA, is it ok?

    Say I'm measuring subjects' performance over some training time. And I have several factors which I thought may affect learning, such as reward. So...

    Started by mirrormirror‎, 03-14-2011 02:59 AM
    • Replies: 1
    • Views: 2,654
    03-14-2011, 11:40 PM Go to last post
  11. Post Hoc or Contrasts ?

    Hi Guys, I have a theoretical question... Someone asked me today what's better to perform while using Analysis of variance: a prior analysis...

    Started by WeeG‎, 03-09-2011 02:46 AM
    • Replies: 1
    • Views: 3,359
    03-13-2011, 03:59 AM Go to last post
  12. I need help

    I need help I have this homework that I cant solve it Show that s^2=(1|n-2)∑(y-y^) is unbiased estimator for sigma^2 in linear regression model...

    Started by redflower‎, 03-09-2011 06:26 PM
    sigma^2, unbiased estimator
    • Replies: 5
    • Views: 2,218
    03-12-2011, 12:13 PM Go to last post
  13. Exponential Trendline and Equations dont match...

    Hi there I have a graph of output values that I have to plot linear and exponential trendlines on and then show the equations and calculate for...

    Started by Janej‎, 03-11-2011 01:44 PM
    • Replies: 1
    • Views: 2,859
    03-11-2011, 04:02 PM Go to last post
  14. 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: 2,595
    03-11-2011, 01:50 PM Go to last post
  15. Proc model

    I am now learning sas from the scratch. well, with Proc model procedure I want to get residuals, predicted values and possibly studentized...

    Started by mugashawil‎, 03-11-2011 12:09 PM
    • Replies: 0
    • Views: 3,811
    03-11-2011, 12:09 PM Go to last post
  16. I need to solve this proplem

    I have to solve this proplem supposeY1,Y2 are random variables with normaly joint distribution Y1~N(u1,segma1^2) Y2~N(u2,segma2^2) prove that...

    Started by redflower‎, 03-10-2011 09:01 PM
    • Replies: 1
    • Views: 2,072
    03-10-2011, 10:15 PM Go to last post
  17. Std Error of nonlinear regression coefficients

    Hi There, I have a commercial NET dll computing nonlinear regression coefficients and their sigma values. However, I would like to compute the...

    Started by Dolphin72‎, 03-10-2011 08:11 PM
    coefficient, nonlinear, standard error
    • Replies: 0
    • Views: 3,636
    03-10-2011, 08:11 PM Go to last post
  18. Combining Model Scores

    Question for the regression modeling experts: I am looking for an efficient and correct way to combine model scores taking into account...

    Started by only1tobin‎, 03-09-2011 04:40 PM
    • Replies: 0
    • Views: 4,573
    03-09-2011, 04:40 PM Go to last post
  19. Linear regression on ranked data

    The dependent variable consists of a set of ranks for two types of project: Logistics and Engineering, to which I've applied a normal transformation....

    Started by ouadad‎, 03-08-2011 03:37 PM
    • Replies: 0
    • Views: 4,902
    03-08-2011, 03:37 PM Go to last post
  20. Problems with adjustment in mediation model

    I am using Baron & Kenny's procedure to test a mediation hypothesis. I realize that the field has evolved a little and others, such as Preacher &...

    Started by PhDOH!‎, 03-05-2011 06:48 PM
    • Replies: 0
    • Views: 2,417
    03-05-2011, 06:48 PM Go to last post
  21. How to handle discrete predictors in a HLM?

    Hi there, I have longitudinal data with several time-invariant predictors (age, gender, personality) and one dichotomous time-variant predictor...

    Started by olliog‎, 03-05-2011 06:18 PM
    • Replies: 0
    • Views: 2,793
    03-05-2011, 06:18 PM Go to last post
  22. Question Correlation coeffcient

    I have no idea where to begin with this. If someone could guide me into the right direction, please. If the correlation coefficient is 0.97, what...

    Started by jamjammuffin‎, 03-05-2011 08:44 AM
    • Replies: 1
    • Views: 3,069
    03-05-2011, 09:23 AM Go to last post
  23. Question What GLM should is use in this dataset?

    Hi everyone and thank you! I'm not a student of statistics, i'm in a different but somehow related field. i'm doing this research, been reading...

    Started by juantamad‎, 03-05-2011 03:46 AM
    categorical data analysis, correspondence analysis, regression, test of indepdence
    • Replies: 1
    • Views: 3,455
    03-05-2011, 04:22 AM Go to last post
  24. 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: 19,007
    03-04-2011, 12:20 PM Go to last post
  25. 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: 3,542
    03-04-2011, 09:55 AM Go to last post
  26. Regression Possibility?

    I've got some real data (from a real experiment), and I'm having trouble finding a way to carry out a regression. The independent variable is...

    Started by AdvoTDV‎, 03-04-2011 12:45 AM
    • Replies: 2
    • Views: 2,215
    03-04-2011, 04:03 AM Go to last post
  27. Binary predictors, continuous independent V!

    hi everyone I need help with doing a regression model. How can I perform a regression analysis when the only independent variable is a continuous...

    Started by helloamerica‎, 03-03-2011 12:37 PM
    • Replies: 3
    • Views: 3,850
    03-03-2011, 05:52 PM Go to last post
  28. regression analysis for massive data sets

    Assume the size of data set is massive, is there any consideration when performing regression analysis?

    Started by winecoding‎, 03-03-2011 11:11 AM
    • Replies: 1
    • Views: 2,601
    03-03-2011, 11:23 AM Go to last post
  29. Linear Regression Through a Point

    Hi Everyone, I'm trying to find the slope of the regression line with the least squares fit which passes through a certain point (x_0,y_0) The...

    Started by timmo567‎, 03-03-2011 03:48 AM
    • Replies: 0
    • Views: 3,657
    03-03-2011, 03:48 AM Go to last post
  30. Simple command in SAS for regression with a large number of covariates?

    I'm a new poster and I searched before creating this thread, so I hope I'm not raising a common question that is constantly being answered here. ...

    Started by Janus‎, 03-01-2011 10:54 PM
    • Replies: 4
    • Views: 4,324
    03-02-2011, 04:25 PM Go to last post
  31. Algebraic Definition of Residuals from a Regression

    I just need a hint on how to get started on this. Any advice? Define the residual from a regression (one independent variable) algebraically and...

    Started by cassetete‎, 03-01-2011 09:07 AM
    regression analysis
    • Replies: 1
    • Views: 3,218
    03-02-2011, 01:31 PM Go to last post
  32. which regression model for time series?

    Hi guys, please help. I need to do regression analysis for demographic data. I am not sure whether linear or logistic regression would be...

    Started by Sylviastat‎, 02-28-2011 02:40 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 10,772
    03-02-2011, 10:59 AM Go to last post
  33. Slope comparison in two-phase regression analysis

    Hi I am using a two-phase regression analysis to analyze some physiological data. The analysis is based on using two, simple linear regressions...

    Started by mattcass‎, 03-01-2011 05:27 PM
    • Replies: 0
    • Views: 5,241
    03-01-2011, 05:27 PM Go to last post
  34. Residualized Coefficient Using Solely Variances and Covariances

    I just want to confirm that I'm on the right track. I need to derive an expression for b^Y1.2 that refers solely to variances and covariances...

    Started by sask‎, 03-01-2011 04:14 PM
    • Replies: 0
    • Views: 2,226
    03-01-2011, 04:14 PM Go to last post
  35. Interpreting Logit Regression Output

    Hi, I'm running logit regression with systat, using fog as a dependent variable (fog did not occur or did, 0 or 1) against 115 predictors with all...

    Started by civilsurfer‎, 02-28-2011 02:08 PM
    • Replies: 0
    • Views: 3,366
    02-28-2011, 02:08 PM Go to last post
  36. R-squared and Explained Sum of Squares?

    I'm not quite sure how to get started on this one, any suggestions? Thanks!! "If you have the following: R-squared for Y on X1,2,3 is 0.25,...

    Started by sask‎, 02-28-2011 11:26 AM
    • Replies: 2
    • Views: 5,114
    02-28-2011, 12:09 PM Go to last post
  37. simple logistic regression question

    I'm doing a willingness to pay survey to see if people are willing to spend $1 for clean water. I randomly sampled 100 people and one of the...

    Started by alphaqn69‎, 02-12-2011 05:10 PM
    • Replies: 5
    • Views: 5,056
    02-28-2011, 12:36 AM Go to last post
  38. Post Discriminant Analysis Issue

    Hello, I'm trying to make sense out of a recent discriminate analysis I ran which confused me. I got really a really low eigenvalue which...

    Started by cinta19‎, 02-27-2011 07:26 PM
    • Replies: 0
    • Views: 3,314
    02-27-2011, 07:26 PM Go to last post
  39. 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: 7,530
    02-27-2011, 03:27 PM Go to last post
  40. Question Automated multivariate nonlinear regression

    I have 4,300 lines of data that looks like this in each column: IV1, IV2, IV3, DV1, DV2 It has five columns, three are IVs, two are DVs. How can I...

    Started by Chicken325‎, 02-26-2011 03:06 PM
    multiple regression
    • Replies: 1
    • Views: 2,925
    02-26-2011, 04:36 PM Go to last post
  41. Addendum: Probit Model, Liklihood Ratio Significant, Very Low Pseudo R-Square

    Multicollinearity does not appear to be a problem. None of the predictor variables has a VIF over 1.5.

    Started by DavidBill‎, 02-25-2011 08:47 AM
    • Replies: 2
    • Views: 3,839
    02-25-2011, 11:23 AM Go to last post
  42. Probit Model: Liklihood Ratio Significant, Very Low Pseudo R-Square

    I'm running a probit model in Stata, and I'm a bit confused by the results. The LR test is highly significant, .0000, but the Pseudo R-Square is very...

    Started by DavidBill‎, 02-25-2011 02:34 AM
    • Replies: 0
    • Views: 5,045
    02-25-2011, 02:34 AM Go to last post
  43. Heteroscedasticity

    I am new to this. I'm conducting analysis using standard multivariate regression and I've been look at some of the outputs from my model (I'm...

    Started by Novice2011‎, 02-24-2011 09:18 PM
    • Replies: 0
    • Views: 3,097
    02-24-2011, 09:18 PM Go to last post
  44. GLM Parameter Estimation in R

    Hello everyone! I was searching for GLM content, then I found this forum, so I thought you could help me :). I'm starting to study GLMs and I know...

    Started by Kol‎, 02-24-2011 08:02 PM
    • Replies: 0
    • Views: 4,602
    02-24-2011, 08:02 PM Go to last post
  45. problem with MR

    Hi, I have a problem with the results of MR and I hope somebody can help me:) conducting MR with Enter method, I got a model which is not...

    Started by jana0303‎, 02-24-2011 03:29 AM
    • Replies: 8
    • Views: 2,579
    02-24-2011, 04:01 PM Go to last post
  46. Probit: Assumption e~N(0,1), why?

    Good evening, I have got a question according the Probit-Model. In this model we always assume that the error term is standard normally...

    Started by RBla‎, 02-24-2011 03:18 PM
    binary response models, discrete response models, index models, probit
    • Replies: 0
    • Views: 2,755
    02-24-2011, 03:18 PM Go to last post
  47. Develop analysis plan on Medical data - trend analysis and model

    First, let me say thank you for any help you can give. I have been searching for nearly two days for a solution to my problem and continue to be...

    Started by JHale‎, 02-24-2011 08:43 AM
    • Replies: 1
    • Views: 7,967
    02-24-2011, 11:20 AM Go to last post
  48. 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: 2,200
    02-24-2011, 04:36 AM Go to last post
  49. Stepwise Regression Analysis

    Under what condition (or conditions) would one observe no change in the regression coefficient for some variable (e.g., b-hat Y on X1) when another...

    Started by sask‎, 02-22-2011 12:40 PM
    • Replies: 1
    • Views: 4,832
    02-23-2011, 10:12 PM Go to last post
  50. Linear regression on bio-data.

    Hi all, I'm completely new to this forum so forgive me (and tell me) if I break protocol in any way. My setup is: I have n animals. I believe...

    Started by Kettle‎, 02-20-2011 06:12 AM
    • Replies: 6
    • Views: 5,088
    02-23-2011, 07:37 PM Go to last post
  51. confidence interval/f-tests

    Basically Fe (iron) is the x variable/predictor, and MDD loss is the y variable/response in minitab. 1. I generated some data (regressoin...

    Started by gomes.‎, 02-21-2011 06:42 PM
    • Replies: 1
    • Views: 6,352
    02-23-2011, 01:01 PM Go to last post
  52. Poisson Regression Offset -- Constrain to 1?

    I have a regression where the observation time varies. I would like to use an offset. Right now, my time variables are . What does it mean to...

    Started by tiab2005‎, 02-22-2011 04:44 PM
    • Replies: 0
    • Views: 2,686
    02-22-2011, 04:44 PM Go to last post
  53. Trouble standardizing regression slopes

    Dear readers, Hopefully you can help me with the following problem. I am using meta-analytic software to perform a meta-analysis. When I...

    Started by mks650‎, 02-22-2011 12:46 PM
    beta, regression, standardization
    • Replies: 0
    • Views: 4,041
    02-22-2011, 12:46 PM Go to last post
  54. Help needed with counter intuitive result in OLS

    Hi All, I have a simple linear regression run between say, statements about the impression with a brand on its favorability What i am getting...

    Started by satish.kumar1986‎, 02-20-2011 02:03 PM
    • Replies: 5
    • Views: 3,967
    02-21-2011, 04:48 AM Go to last post
  55. Appropriate logistic regression model to control for confounders?

    I am working with a cross-sectional study sample (N=601). The goal of my research is to investigate if there is an association between a disease (X)...

    Started by CarlAH‎, 02-18-2011 04:26 PM
    • Replies: 2
    • Views: 9,868
    02-18-2011, 05:20 PM Go to last post
  56. [Probit] Can I be confident in my results even with a poor Goodness-of-Fit test?

    I am running a probit analysis on a data set with about 1000 cases, predicting probability of college graduation by a set of college institutional...

    Started by DavidBill‎, 02-18-2011 01:08 PM
    • Replies: 3
    • Views: 4,322
    02-18-2011, 03:27 PM Go to last post
  57. Fixed Effects Common Panel Regression versus GMM estimation

    Hi, I have estimated my model using the Fixed Effects Common Panel method and this seems to work fine. I get an R2 of .90 However, I am now in...

    Started by Herbert‎, 02-18-2011 07:43 AM
    common panel, fixed effects, gmm
    • Replies: 0
    • Views: 6,167
    02-18-2011, 07:43 AM Go to last post
  58. dummy variable multiple regression

    Hello guys, I am doing a project on calendar affects(seasonality) in the stock market for which i am trying to perform a dummy variable regression...

    Started by Manasa‎, 02-17-2011 08:45 AM
    • Replies: 2
    • Views: 8,828
    02-17-2011, 12:04 PM Go to last post
  59. Dealing with multi-level categorical variables in regression

    Hi everyone, I have been working in R and using lmer() to run mixed-effect linear and logistic regression models to study language processing. ...

    Started by mgillespie‎, 02-16-2011 02:37 PM
    collinearity, dummy variables, regression
    • Replies: 0
    • Views: 5,928
    02-16-2011, 02:37 PM Go to last post
  60. What test can I use to find out which bivariate regression is *significantly* better?

    I have three variables: y, x1 and x2 (n=130). I want to know whether one of the x variables is a significantly better bivariate predictor than the...

    Started by verarium‎, 02-15-2011 05:32 PM
    • Replies: 3
    • Views: 2,996
    02-16-2011, 01:49 PM Go to last post

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