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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 2,418
    03-05-2011, 06:48 PM Go to last post
  2. 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: 4,908
    03-08-2011, 03:37 PM Go to last post
  3. 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: 4,576
    03-09-2011, 04:40 PM Go to last post
  4. 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: 3,638
    03-10-2011, 08:11 PM Go to last post
  5. 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: 2,073
    03-10-2011, 10:15 PM Go to last post
  6. 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: 3,815
    03-11-2011, 12:09 PM Go to last post
  7. 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: 2,596
    03-11-2011, 01:50 PM Go to last post
  8. 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: 2,860
    03-11-2011, 04:02 PM Go to last post
  9. 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: 2,220
    03-12-2011, 12:13 PM Go to last post
  10. 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
  11. 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: 2,655
    03-14-2011, 11:40 PM Go to last post
  12. 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: 2,872
    03-15-2011, 05:39 AM Go to last post
  13. 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: 3,393
    03-16-2011, 03:16 AM Go to last post
  14. 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: 3,465
    03-16-2011, 03:30 PM Go to last post
  15. 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
  16. 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: 3,628
    03-16-2011, 10:56 PM Go to last post
  17. 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
  18. 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: 5,713
    03-17-2011, 07:26 AM Go to last post
  19. 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: 2,897
    03-18-2011, 10:36 AM Go to last post
  20. 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: 2,904
    03-20-2011, 04:43 PM Go to last post
  21. Nonlinear Regression for the P/PE of the S&P 500??

    Hello All, I’m hoping that someone can help me figure out what regression model I should be using. I don’t think that a linear regression model...

    Started by Turkish721‎, 03-16-2011 01:44 PM
    • Replies: 1
    • Views: 3,787
    03-20-2011, 04:54 PM Go to last post
  22. 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: 7,538
    03-21-2011, 01:49 AM Go to last post
  23. 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: 2,959
    03-21-2011, 01:55 PM Go to last post
  24. Regression in First and Second Differences

    I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

    Started by lxh5027‎, 03-21-2011 10:23 PM
    dfuller, first difference, regression, second difference
    • Replies: 3
    • Views: 17,084
    03-22-2011, 05:45 PM Go to last post
  25. 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: 1,842
    03-23-2011, 10:13 AM Go to last post
  26. 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: 5,644
    03-24-2011, 12:14 AM Go to last post
  27. Same point of a graph? Novice needs guidance!

    Dear All, I'm a BSc student currently involved in materials testing. In several of my tests I am getting a graph plotting extension(mm) vs....

    Started by Apprentice‎, 03-24-2011 04:45 PM
    • Replies: 1
    • Views: 2,392
    03-24-2011, 05:15 PM Go to last post
  28. 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: 2,129
    03-25-2011, 05:47 AM Go to last post
  29. Regression using Panel Data. Did I do it right?

    Sorry I did it wrong!

    Started by Ledge‎, 03-24-2011 02:54 PM
    • Replies: 2
    • Views: 4,370
    03-25-2011, 07:20 AM Go to last post
  30. Exclamation Please Help! Don't know which model to use

    Hello, I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it! The problem...

    Started by bobart261‎, 03-16-2011 10:36 PM
    likelihood, probability, regression
    • Replies: 2
    • Views: 2,449
    03-25-2011, 11:07 AM Go to last post
  31. is this model misspecified

    i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

    Started by ble21ach‎, 03-23-2011 11:20 PM
    • Replies: 3
    • Views: 2,758
    03-25-2011, 11:12 PM Go to last post
  32. Regression Variable (Only Applicable to Certain Cases)

    Hi, I'm doing a multiple linear regression. One of the variables I am using is a continuous numerical variable, however, it only applies to about...

    Started by StatsStacey‎, 03-26-2011 11:43 AM
    • Replies: 1
    • Views: 3,021
    03-27-2011, 08:47 PM Go to last post
  33. Please help, how do i interpret this?

    okay the regression formula that i have worked out is y=12559.7477 + 4265.7566X i have to discuss the size, sign, significance and meaning of this. I...

    Started by danswe3‎, 03-26-2011 04:09 PM
    • Replies: 1
    • Views: 6,150
    03-27-2011, 08:49 PM Go to last post
  34. Model specification for Pooled Panel Regression

    I am doing a research on the diversification potential of microfinancial assets. The methodology I use is a mean variance spanning test. I have to...

    Started by sebneedhelp‎, 03-26-2011 12:59 PM
    • Replies: 1
    • Views: 6,900
    03-27-2011, 09:06 PM Go to last post
  35. Does the intercept p value matter?

    Hi, I have outputs of a simple linear model as follows: y = 0.0339 + 0.27918X The p value of the intercept is 0.206 and of the slope is...

    Started by anglais428‎, 03-08-2011 06:48 AM
    intercept p value
    • Replies: 4
    • Views: 50,945
    03-28-2011, 08:14 PM Go to last post
  36. 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: 4,180
    03-28-2011, 09:18 PM Go to last post
  37. 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: 4,277
    03-29-2011, 02:02 AM Go to last post
  38. 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: 2,347
    03-29-2011, 04:54 AM Go to last post
  39. Logistic transformation - please help with the use of scientific calculator

    Hi there, I believe I have a trivial question. I am studying logistic regression and trying to understand how the values are transformed - e.g ...

    Started by Sylviastat‎, 03-29-2011 01:57 PM
    • Replies: 4
    • Views: 3,944
    03-29-2011, 05:34 PM Go to last post
  40. 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: 2,647
    03-30-2011, 10:36 AM Go to last post
  41. non-nested models in multilevel analysis

    Hi, I have a question on multilevel analysis. I'm reading a book by Kreft & de Leeuw (Introducing Multilevel Analysis). They give an example for a...

    Started by alex92‎, 03-31-2011 08:15 AM
    • Replies: 1
    • Views: 3,781
    03-31-2011, 10:37 AM Go to last post
  42. Logistic Regression with too many IV

    Hi Guys, What would you do, if you had to build a logistic regression model, where you have 500 (!!) independent variables... ? Any manual best...

    Started by WeeG‎, 03-27-2011 02:15 PM
    • Replies: 11
    • Views: 6,866
    04-01-2011, 12:45 PM Go to last post
  43. 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: 3,325
    04-01-2011, 05:37 PM Go to last post
  44. 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: 2,175
    04-03-2011, 03:08 AM Go to last post
  45. Logistic Regression - Residual Deviance > Residual Df

    Hi There I'm doing a logistic regression on a set of data with 753 groups of observations (although some groups just have one observation). In...

    Started by uzuria‎, 03-28-2011 08:31 AM
    • Replies: 3
    • Views: 9,182
    04-03-2011, 08:08 AM Go to last post
  46. Hosmer-Lemeshow

    Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

    Started by igolonte‎, 03-30-2011 07:25 AM
    • Replies: 7
    • Views: 9,339
    04-04-2011, 07:24 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: 3,313
    04-05-2011, 08:04 AM Go to last post
  48. Testing interaction effects

    I had a few question regarding the testing of interactions. First, should I be centering my variables using the mean and/or standardizing my...

    Started by psychcounsel84‎, 04-04-2011 05:27 PM
    • Replies: 2
    • Views: 4,024
    04-05-2011, 03:15 PM Go to last post
  49. 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: 4,879
    04-05-2011, 04:36 PM Go to last post
  50. what is cross section regression analysis?

    Can someone help me by defining what is cross section regression analysis and the limits of this. :)

    Started by danswe3‎, 03-29-2011 04:33 AM
    • Replies: 1
    • Views: 22,092
    04-06-2011, 12:40 PM Go to last post
  51. Transformation of Data - NO linearity!

    PROBLEM >>>>>>>>> The savings rate (personal savings/disposible income) and per capita disposible income (DPI) are listed for the 50 countries...

    Started by recursive1990‎, 04-01-2011 12:07 PM
    • Replies: 2
    • Views: 3,496
    04-07-2011, 01:17 AM Go to last post
  52. Linear Regression Coefficient and Multiple Regression Coefficient

    Hello Folks: When you use just 2 variables for regression and then when you use the same 2 variables plus an additional 2 other independent...

    Started by jintu7977‎, 04-02-2011 10:10 PM
    omitted variable bias
    • Replies: 3
    • Views: 8,463
    04-07-2011, 08:48 PM Go to last post
  53. Help with Mutiple Regression Analysis

    Hello, I am doing my dissertation on Racial differences in Stigma related attitudes towards mentall illness. I have 200 participants, 120 from...

    Started by katerine75‎, 03-30-2011 05:24 PM
    • Replies: 4
    • Views: 3,046
    04-07-2011, 08:50 PM Go to last post
  54. R^2 vs AIC paradox?

    Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

    Started by alfredman‎, 03-28-2011 07:07 AM
    • Replies: 13
    • Views: 16,227
    04-07-2011, 11:10 PM Go to last post
  55. regression and correlation

    Hello, correlation between two variables is positive (and significant) and then when I put it in regression analysis it becomes negative predictor...

    Started by Vanja‎, 04-08-2011 03:09 AM
    • Replies: 1
    • Views: 3,325
    04-08-2011, 05:15 AM Go to last post
  56. help with Linear regression with nfl stats please

    Hey guys, just wondering if I could get some help with the best way to use my data. After the challenge system was introduced into the nfl in 1999...

    Started by rbskee‎, 04-08-2011 09:41 AM
    • Replies: 3
    • Views: 4,320
    04-09-2011, 01:19 AM Go to last post
  57. Interpretation of Loglinear model

    Hi All, I am performing a regression analysis through a log linear model. But I am not able to effectively interpret the coefficient of the...

    Started by sach_83‎, 04-09-2011 05:43 PM
    • Replies: 2
    • Views: 15,683
    04-10-2011, 01:17 AM Go to last post
  58. Variable selection for multiple regression analysis

    Hi everybody there. I want to correlate 2 main variables (say "a" Dependant and "b" independent of course) BUT at the same time i want to add 5 other...

    Started by mzalikhan@gmail.com‎, 04-10-2011 10:07 PM
    multiple regression, variable selection
    • Replies: 2
    • Views: 3,965
    04-11-2011, 06:08 PM Go to last post
  59. Link function

    Hi all, I've never really understood the concept of "link functions". Is anyone able to point me in the right direction of something that could...

    Started by duskstar‎, 04-12-2011 03:18 AM
    • Replies: 1
    • Views: 3,012
    04-12-2011, 05:51 AM Go to last post
  60. 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: 2,607
    04-12-2011, 07:49 AM Go to last post

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