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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. GLM repeated measurements with very large database

    I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

    Started by drGG‎, 01-27-2011 08:42 AM
    • Replies: 0
    • Views: 2,908
    01-27-2011, 08:42 AM Go to last post
  2. LSVD regression - how many dummies

    hey, I'm back and making progress :) I want to run a LSDV regression on my panel data. How many dummies do I have to include? All of them for...

    Started by jayde‎, 01-27-2011 09:13 AM
    • Replies: 0
    • Views: 2,678
    01-27-2011, 09:13 AM Go to last post
  3. Exclamation Help Non linear Growth Models - Derivates

    Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in some growth parameters in onion,...

    Started by acocac‎, 01-27-2011 06:59 PM
    gauss, nonlinear
    • Replies: 0
    • Views: 2,460
    01-27-2011, 06:59 PM Go to last post
  4. Need help! Fairly simple questions.

    Hey guys, So I successfully proved that the sum of epsilons (the e in y=B0+B1*x+e) equaled 0. Now how do I prove that the sum of xi's...

    Started by amarkham‎, 01-27-2011 09:29 PM
    • Replies: 0
    • Views: 2,293
    01-27-2011, 09:29 PM Go to last post
  5. GEE prediction interval... Help?

    Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

    Started by bbikkel‎, 01-30-2011 03:33 PM
    • Replies: 0
    • Views: 2,451
    01-30-2011, 03:33 PM Go to last post
  6. Help finding standard error

    If i have following regression and numbers: Y(with a "hat" over)= -66,1058 + 0,0650X R^2= 0,9460 Se(standard error) = (10,7509) ( ...

    Started by student89‎, 02-02-2011 05:59 AM
    • Replies: 0
    • Views: 1,698
    02-02-2011, 05:59 AM Go to last post
  7. Question Formulas for : CVRMSE and Net Mean Bias

    Hi folks, I am in the energy industry, and we do linear/multilinear regressions stats. One of the concepts being introduced to supplement...

    Started by paluee‎, 02-03-2011 12:53 PM
    • Replies: 0
    • Views: 3,602
    02-03-2011, 12:53 PM Go to last post
  8. goal is logistical regression model...where to start

    I'm working with weather data using systat software. I have raw values of dependent variable visibility that have been categorized into boolean 1/0...

    Started by civilsurfer‎, 02-07-2011 12:08 PM
    • Replies: 0
    • Views: 2,026
    02-07-2011, 12:08 PM Go to last post
  9. independant variables?

    I'm a little confused on the whole dependent-independent thing.... I'm doing a multiple linear regression with 13 variables in order to predict...

    Started by danjohnson10‎, 02-08-2011 03:50 PM
    • Replies: 0
    • Views: 2,066
    02-08-2011, 03:50 PM Go to last post
  10. Confounding and rank of expanded design matrix

    Hello, If I have confounding with 1 defining equation two columns of the expanded design matrix are equal (blocks and the confounding factor). ...

    Started by mmstat‎, 02-11-2011 11:32 AM
    • Replies: 0
    • Views: 2,826
    02-11-2011, 11:32 AM Go to last post
  11. Need help on a GMM estimation

    Hello to all, I am trying to do a GMM estimation (with xtabond2) on a little sample of about 250 observation, but I cannot get a good result (in...

    Started by roman10‎, 02-13-2011 02:59 PM
    • Replies: 0
    • Views: 2,481
    02-13-2011, 02:59 PM Go to last post
  12. Interaction can change slope coefficients

    Hi all, Would anyone be able to explain why an interactive regression model would have different main effects than an additive model of the same...

    Started by not_normal‎, 02-15-2011 10:46 PM
    • Replies: 0
    • Views: 2,133
    02-15-2011, 10:46 PM Go to last post
  13. Error distribution and non linear models.

    Ok, I am reformulating this question because it started rather silly. As I always point out, my background is not statistics so please excuse my...

    Started by darfunkel‎, 02-16-2011 11:31 AM
    • Replies: 0
    • Views: 1,991
    02-16-2011, 11:31 AM Go to last post
  14. 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: 5,914
    02-16-2011, 02:37 PM Go to last post
  15. 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: 6,149
    02-18-2011, 07:43 AM Go to last post
  16. 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: 3,962
    02-22-2011, 12:46 PM Go to last post
  17. 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: 2,681
    02-22-2011, 04:44 PM Go to last post
  18. 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: 2,194
    02-24-2011, 04:36 AM Go to last post
  19. 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: 2,751
    02-24-2011, 03:18 PM Go to last post
  20. 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: 4,584
    02-24-2011, 08:02 PM Go to last post
  21. 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: 3,087
    02-24-2011, 09:18 PM Go to last post
  22. 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: 5,032
    02-25-2011, 02:34 AM Go to last post
  23. 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: 3,302
    02-27-2011, 07:26 PM Go to last post
  24. 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: 3,356
    02-28-2011, 02:08 PM Go to last post
  25. 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: 2,218
    03-01-2011, 04:14 PM Go to last post
  26. 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: 5,215
    03-01-2011, 05:27 PM Go to last post
  27. 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: 3,636
    03-03-2011, 03:48 AM Go to last post
  28. 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: 3,534
    03-04-2011, 09:55 AM Go to last post
  29. 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: 2,788
    03-05-2011, 06:18 PM Go to last post
  30. 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: 2,409
    03-05-2011, 06:48 PM Go to last post
  31. 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: 4,887
    03-08-2011, 03:37 PM Go to last post
  32. 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: 4,560
    03-09-2011, 04:40 PM Go to last post
  33. 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: 3,628
    03-10-2011, 08:11 PM Go to last post
  34. 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: 3,800
    03-11-2011, 12:09 PM Go to last post
  35. 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: 3,608
    03-16-2011, 10:56 PM Go to last post
  36. 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: 1,951
    03-17-2011, 06:38 AM Go to last post
  37. Lightbulb Spanning test with short sales constraints - how does it works?

    Dear all, I need to perform a spanning test with short sales constraint to assess the diversification potential of microfinancial assets. I red...

    Started by sebneedhelp‎, 03-21-2011 01:55 PM
    • Replies: 0
    • Views: 2,952
    03-21-2011, 01:55 PM Go to last post
  38. Need Help Choosing a Textbook

    Hi, I'm looking for a textbook/book to let me self-study regression analysis. Some background: I have a research psych background...

    Started by trebonus‎, 03-23-2011 10:13 AM
    regression, regression analysis, self-study, textbook
    • Replies: 0
    • Views: 1,832
    03-23-2011, 10:13 AM Go to last post
  39. Regression analysis for a cross sectional study

    Good morning all. I am supposed to perform a regression analysis for a crossectional survey, using STATA. The thing is i dont know where to...

    Started by nostatisticsgirl‎, 03-24-2011 12:14 AM
    • Replies: 0
    • Views: 5,626
    03-24-2011, 12:14 AM Go to last post
  40. Logistic regression question

    Hi everyone, I have a question regarding an exercise on Gujarati's "Basic Econometrics" (exercise 15.2 p.625 4th edition). In this exercise we are...

    Started by ddrebelo‎, 03-25-2011 05:47 AM
    • Replies: 0
    • Views: 2,124
    03-25-2011, 05:47 AM Go to last post
  41. Robust regression

    Hi, I am trying to use robust regression instead of ordinary least squares since my data set has a lot of outliers but I don't know if I have...

    Started by akhil123‎, 03-28-2011 09:18 PM
    • Replies: 0
    • Views: 4,159
    03-28-2011, 09:18 PM Go to last post
  42. Ordinal regression vs Linear regression

    Here's the situation: I have a categorical dependent variable (3 categories), and 3 continuous explanatory variables. Say I perform an ordinal...

    Started by annie_81‎, 03-29-2011 02:02 AM
    • Replies: 0
    • Views: 4,259
    03-29-2011, 02:02 AM Go to last post
  43. what does the parameter a and b mean?

    I have worked out the regression equation Y= 12559.7477 + 4265.7566X What does 12559.7477 and 4265.7566X mean? Is 12559.7477 the y-intercept...

    Started by danswe3‎, 03-29-2011 04:54 AM
    • Replies: 0
    • Views: 2,329
    03-29-2011, 04:54 AM Go to last post
  44. Post Can someone please help me set up regression analysis

    I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

    Started by rtd212‎, 03-30-2011 10:36 AM
    regression analysis
    • Replies: 0
    • Views: 2,638
    03-30-2011, 10:36 AM Go to last post
  45. Business Stats, regression

    Hey everyone, Does anyone know the steps that minitab or any other stats software does to eliminate variables when doing forward selection,...

    Started by alias‎, 04-01-2011 05:37 PM
    • Replies: 0
    • Views: 3,310
    04-01-2011, 05:37 PM Go to last post
  46. Help with repeated measures analyses

    Hi everyone It is my first posting in this forum so hope I am not asking something that has been answered lots. I am trying to analyses a...

    Started by Maxine‎, 04-03-2011 03:08 AM
    • Replies: 0
    • Views: 2,167
    04-03-2011, 03:08 AM Go to last post
  47. Generalized Cross Validation

    Hello Guys, I'm runing MATLAB code on SVD with roughness penalties. When I use GCV to choose the parameter, I have a question regarding the...

    Started by FantasyCC‎, 04-05-2011 08:04 AM
    • Replies: 0
    • Views: 3,299
    04-05-2011, 08:04 AM Go to last post
  48. Repeat sales regression help

    Hello everyone, I am in need of any help or guidance working on a repeat sales regression using spss. I am doing a repeat sales index on housing...

    Started by Concepts003‎, 04-05-2011 04:36 PM
    • Replies: 0
    • Views: 4,865
    04-05-2011, 04:36 PM Go to last post
  49. Help needed with contrasts for 2by2byTime regression analysis in SPSS mixed

    I have 2 categorical variables with both 2 levels, for which I also want to estimate the interaction effect. I have used effect coding for these two...

    Started by esmee‎, 04-12-2011 07:49 AM
    • Replies: 0
    • Views: 2,595
    04-12-2011, 07:49 AM Go to last post
  50. Unhappy Mean Squared Prediction Error?

    Hi, I am having trouble understanding how to use MSPE. Let's say I have 30 data points and then a sample of 4 of them is selected (the 'test...

    Started by TheFirstOrder‎, 04-12-2011 10:50 AM
    • Replies: 0
    • Views: 3,714
    04-12-2011, 10:50 AM Go to last post
  51. Discrete regression

    What is the/an appropriate regression technique to use where the dependent variables are discrete labels. For example, I have predicted survival...

    Started by marius1‎, 04-12-2011 11:59 AM
    • Replies: 0
    • Views: 2,407
    04-12-2011, 11:59 AM Go to last post
  52. Johansen Cointegration test issue

    Hello, Let me describe the issue: I have a vector of four time series, each component of which is I(1). When I put the four series into a matrix...

    Started by LostInNY‎, 04-14-2011 05:00 PM
    cointegration, johansen
    • Replies: 0
    • Views: 2,263
    04-14-2011, 05:00 PM Go to last post
  53. Question Time series or just repeated measures?

    Hi All, I have data on 7 clusters (ie, sites). The date are monthly counts (there is no zero inflation in most of the outcomes of interest...most...

    Started by SabbyATL‎, 04-14-2011 09:14 PM
    clusters, count data, repeated measures, time series
    • Replies: 0
    • Views: 2,972
    04-14-2011, 09:14 PM Go to last post
  54. working correlation matrix to use in generalized estimating equations

    I have a design with a between-subject variable (emotion) and within-subject variable (task type), and response data were binary (answer to a task:...

    Started by Yue‎, 04-15-2011 02:41 PM
    • Replies: 0
    • Views: 3,636
    04-15-2011, 02:41 PM Go to last post
  55. Interaction Between Quadratic Variables in Logistic Regression

    Hi, I got some questions about assumption and interpretation of conditional logistic regression. It seems that two of my variables (let says N and...

    Started by STG‎, 04-18-2011 07:42 AM
    • Replies: 0
    • Views: 3,369
    04-18-2011, 07:42 AM Go to last post
  56. Weighted Least Squares & VIF - SPSS questions

    I was hoping someone could help me understand a problem I am having. I frequently use weighted least squares, however I do not estimate the weights...

    Started by AnalystNYC‎, 04-19-2011 10:17 AM
    • Replies: 0
    • Views: 4,147
    04-19-2011, 10:17 AM Go to last post
  57. Error Propagation in Multivariable Regression

    I've spent all day reading Matlab tutorials and can't seem to find anything about propagating error in regression analysis. I have a set of x and y...

    Started by lizakova‎, 04-20-2011 05:41 PM
    • Replies: 0
    • Views: 2,973
    04-20-2011, 05:41 PM Go to last post
  58. Choosing the Best Regression Model

    I have been asked to build a predictive model of a population based on cost. The sample size of the population is 30k for the current test (with data...

    Started by JAH‎, 04-22-2011 03:48 PM
    • Replies: 0
    • Views: 3,670
    04-22-2011, 03:48 PM Go to last post
  59. Correlation and Multiple Regression

    Can you please help me understand the following questions - 1. Looking at correlations and scatterplots how can we determine if multiple regression...

    Started by raamaak‎, 04-23-2011 03:32 AM
    • Replies: 0
    • Views: 1,709
    04-23-2011, 03:32 AM Go to last post
  60. inverse transformation and reflection

    Hi all, I'm doing a multiple regression analysis and my outcome variable is strongly positively skewed. Without transformation skewness = 2.10...

    Started by abuschgens‎, 04-29-2011 05:18 AM
    • Replies: 0
    • Views: 2,841
    04-29-2011, 05:18 AM Go to last post

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