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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Data Transformations in Multiple Regression

    I have a non-normal distribution for the residuals I'm testing for a multiple regression--what's the best course of action to take? If I transform...

    Started by Pachy‎, 06-03-2011 08:05 PM
    • Replies: 1
    • Views: 4,350
    06-03-2011, 09:07 PM Go to last post
  2. Simple Linear Regression with GUM Uncertainties

    I would appreciate it if someone could suggest some references that discuss how to formally incorporate measurement uncertainties (as calculated per...

    Started by Tom La Bone‎, 07-23-2009 04:31 PM
    • Replies: 0
    • Views: 4,349
    07-23-2009, 04:31 PM Go to last post
  3. Differences Between ANOVA and multiple regression

    What are the differences between ANOVA and multiple regression? If I want to figure out if there exist impacts of one variable on the other, which...

    Started by lztoby‎, 08-30-2010 09:26 PM
    • Replies: 1
    • Views: 4,345
    08-30-2010, 09:58 PM Go to last post
  4. statistics problem

    I am stumped on how to go about making the test statistic for this problem. Any help would be appreciated. Thank you. Suppose that you would like...

    Started by rambo67‎, 06-11-2008 09:17 PM
    • Replies: 7
    • Views: 4,337
    06-12-2008, 05:56 PM Go to last post
  5. Transformed Interactions in Regression

    Hi all, I have a quick (but surprisingly difficult) question to ask regarding transformed variables in an interaction term when conducting...

    Started by mandy_a41‎, 03-24-2009 10:33 PM
    • Replies: 3
    • Views: 4,334
    03-25-2009, 07:42 PM Go to last post
  6. Regression Estimated variance and Chi-square distribution

    Hi all * If i have a data set and I model it using linear regression I estimate intercept, slope and variance Ymodel=a+bx and the...

    Started by saaagar‎, 11-21-2010 04:48 AM
    • Replies: 0
    • Views: 4,332
    11-21-2010, 04:48 AM Go to last post
  7. 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: 4,330
    12-04-2012, 02:22 PM Go to last post
  8. Physiology grad student needing some help - linear regression through the origin

    Hi all. I'm a PhD student in physiology, and I seem to be suffering from mild amnesia when it comes to statistics. My old course notes are out of my...

    Started by Pascal‎, 01-04-2010 09:45 AM
    • Replies: 6
    • Views: 4,327
    01-06-2010, 04:43 AM Go to last post
  9. 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: 4,325
    03-02-2011, 04:25 PM Go to last post
  10. [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: 4,324
    02-18-2011, 03:27 PM Go to last post
  11. Continuous Moderator and DV and categorical IV (dummy coded) Help please!!!

    I ran an experiment recently and now I'm trying to work out whether either of the covariates (anxiety or avoidance) interact with the effect of any...

    Started by LoopyLou‎, 06-11-2012 10:55 AM
    • Replies: 1
    • Views: 4,324
    06-11-2012, 03:28 PM Go to last post
  12. 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
  13. Interpretation of MANOVA

    Hello everyone, Forgive me for my ignorance, but I have a quick basic question. When conducting a MANOVA (Using JMP) the output gives me values...

    Started by kron3007‎, 11-29-2010 01:54 PM
    • Replies: 1
    • Views: 4,313
    11-29-2010, 01:55 PM Go to last post
  14. F-Test Interpretation and Log-Linear?

    Hey. I have found this a very difficult subject to self-teach and unfortunately I have not found my teachers particularly helpful. Sorry about the...

    Started by Jak‎, 04-16-2012 02:10 PM
    • Replies: 9
    • Views: 4,313
    04-27-2012, 01:40 PM Go to last post
  15. t-test for categorical predictors in regression WRONG!?

    hey people... so i am sitting in my theory of GLMs class... and the prof just said something i had never ever heard in my life... which is that, in...

    Started by spunky‎, 10-26-2011 12:16 PM
    • Replies: 9
    • Views: 4,312
    10-26-2011, 01:08 PM Go to last post
  16. Interpreting the regression RMSE when responses are measurements with known SD

    Hi all, I'm fitting a simple regression model (Y = a + bX) where my responses are measurements whose standard deviations, SD, are available....

    Started by fgg‎, 07-19-2014 09:04 PM
    • Replies: 8
    • Views: 4,312
    07-29-2014, 07:11 PM Go to last post
  17. Help with Regression Analysis

    It's been a while since I've done a regression analysis. I'm trying to run a multivariate regression analysis in Excel to determine whether or not...

    Started by cglinn‎, 07-12-2011 09:31 AM
    • Replies: 9
    • Views: 4,305
    07-12-2011, 04:34 PM Go to last post
  18. Multinomial Logit vs Dummies vs Ordinal Logit

    Hello everybody, I need help with the following: I would like to conduct a survey, where my dependent variable would be a discrete, nominal...

    Started by EgZeKuToR‎, 11-18-2010 03:22 PM
    • Replies: 0
    • Views: 4,299
    11-18-2010, 03:22 PM Go to last post
  19. Which regression model to use with skewed & ordinal data?

    I'm a bit stucked and just wondering about which regression technic to use with my dependent variable at hand. Respondents were asked to provide a...

    Started by Chris_J‎, 03-19-2013 10:13 AM
    regresion
    • Replies: 3
    • Views: 4,297
    03-19-2013, 04:16 PM Go to last post
  20. Using OLS vs Probit/Logit to estimate a threshold

    Suppose you're a meteorologist and want to predict whether tomorrow the temperature will exceed 20 degrees. Your boss gives you data where t is...

    Started by aboluk‎, 07-03-2012 06:57 PM
    • Replies: 7
    • Views: 4,290
    07-04-2012, 04:21 PM Go to last post
  21. 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: 4,278
    03-29-2011, 02:02 AM Go to last post
  22. Question Can "infinite" values be used in regression?

    Hello, I am analyzing a series of plots along a recovery gradient, using "time since disturbance" as a continuous variable. I want to see how...

    Started by GiganD‎, 04-03-2008 03:21 PM
    • Replies: 4
    • Views: 4,277
    04-07-2008, 01:50 PM Go to last post
  23. Questions on which stats to use & sigmaplot for Logistic Regression

    Hi Everyone, This is my first time on the forum. I have been having problems deciding on what test to use for my data and how to input the data...

    Started by Bennice‎, 03-04-2013 07:59 PM
    • Replies: 5
    • Views: 4,273
    03-05-2013, 12:09 PM Go to last post
  24. Question Effect Coding: p-value of reference category

    Hi, I fit a regression model with effect coded variables. I'm well aware of how to compute the value for the reference category but I have...

    Started by Chris25‎, 02-18-2013 03:39 AM
    effect coding, p-value, regression, standard deviation
    • Replies: 2
    • Views: 4,264
    02-19-2013, 03:38 AM Go to last post
  25. Lack of Fit Test

    Hi, Can someone please help me derive the expression for E(MSLF) -- Expected Value for the means squares lack of fit (MSLF) Thanks.

    Started by nubyra‎, 12-21-2011 02:12 PM
    • Replies: 4
    • Views: 4,258
    12-27-2011, 01:15 AM Go to last post
  26. Unhappy is it possible for all variables results in no significant value?

    i need help on my multiple linear regression statistics assignment on conclusion and recommendation part... my problem is all the independent...

    Started by tonynk9‎, 08-14-2010 01:12 PM
    • Replies: 0
    • Views: 4,257
    08-14-2010, 01:12 PM Go to last post
  27. Problem with mixed effects model with binary data

    Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a...

    Started by pydbl‎, 01-09-2011 11:44 PM
    binary, complete separation, glmer, lmer, mixed effects
    • Replies: 2
    • Views: 4,256
    01-10-2011, 01:00 AM Go to last post
  28. Regression approach to ANOVA

    I am trying to fit regression for some categorical variables. I have two treatment A(3 levels) and B (2 levels) and their interaction. The output...

    Started by lovedieer‎, 03-03-2008 11:17 PM
    • Replies: 6
    • Views: 4,254
    03-07-2008, 04:10 PM Go to last post
  29. Non-Significant Categorical Predictor in Logistic Regression

    hi: In the logistic regression modeling one of my predictor is categorical with 4 categories. We use 3 categories considering one as reference...

    Started by navibs‎, 02-02-2012 09:21 AM
    • Replies: 2
    • Views: 4,253
    02-02-2012, 10:25 AM Go to last post
  30. Pooled cross sectional data: How to test for and handle autocorrelation?

    Hi, 1) My goal: I am making a difference-in-difference analysis to estimate the development in political efficacy for a certain group of people...

    Started by MHansen‎, 06-23-2012 09:50 AM
    autocorrelation, durbin-watson, lagged effects, pooled cross section
    • Replies: 0
    • Views: 4,252
    06-23-2012, 09:50 AM Go to last post
  31. Nested or Repeated measures analysis for ecology data?

    This is a refinement of an earlier question I asked. ...

    Started by Cheffy‎, 03-01-2013 12:16 PM
    • Replies: 3
    • Views: 4,249
    03-18-2013, 11:03 AM Go to last post
  32. Poynomial Regression through the origin

    I am trying to program in SQL a polynomial regression of degree two with a zero intercept. I can't seem to find the appropriate literature on this...

    Started by coling‎, 07-24-2012 03:43 PM
    • Replies: 8
    • Views: 4,235
    07-24-2012, 05:50 PM Go to last post
  33. Linear regression analysis proof question

    Hi, can anyone help me please in writing a proof to the following linear regression problem? I have spent countless hours trying to solve it but am...

    Started by tskhor‎, 08-01-2010 10:27 AM
    • Replies: 2
    • Views: 4,233
    08-02-2010, 07:56 AM Go to last post
  34. Confidence Intervals for predicted values

    Hu Guys, I hope you could provide hints to put me on the right track. A scholar has devised a device to measure the momentum of inertia (Mi) of...

    Started by gianmarco‎, 10-21-2013 05:02 AM
    • Replies: 10
    • Views: 4,233
    11-05-2013, 01:17 PM Go to last post
  35. How to test significance of the mean of multiple OLS regressions (Jensen's Alpha).

    Hi. Im working on a paper on mutual fund performance, using Jensen's Alpha to measure performance. Ri-Rf=a+b(Rm-rf)+ei Time series regression,...

    Started by Vogelius‎, 03-26-2012 08:56 AM
    • Replies: 1
    • Views: 4,224
    04-17-2012, 06:23 AM Go to last post
  36. Multivariate Regression vs Canonical Correlation

    I know the difference between correlation and regression, however, I'm a little confused with the difference between Canonical Correlation (CCR) and...

    Started by jonathaned55‎, 11-12-2012 11:09 PM
    canonical correlation, multivariate regression
    • Replies: 1
    • Views: 4,220
    11-17-2012, 06:55 PM Go to last post
  37. Panel Data and model specification

    Sorry to ask questions which may be obvious to many, but I am just starting out with Stata and econometrics so if anyone could help me I would really...

    Started by tko778‎, 01-21-2011 01:25 PM
    • Replies: 1
    • Views: 4,219
    01-22-2011, 12:23 AM Go to last post
  38. Calculation of effect size in Hierarchical regression

    Hello there, I have conducted a hierarchical regression with two steps. Statistical significance resulted form the first step, as the second...

    Started by YunaniQA‎, 05-29-2013 06:37 AM
    effect size
    • Replies: 3
    • Views: 4,216
    05-29-2013, 11:02 AM Go to last post
  39. Segmented Regression Sample Size

    Hello, I am using Segmented Regression (SegReg*) to compare proportional occurrence (Y) of 18 species vs. proportional habitat cover (X) to...

    Started by sherwood043‎, 12-11-2010 06:45 PM
    • Replies: 0
    • Views: 4,215
    12-11-2010, 06:45 PM Go to last post
  40. Conditional Regression Analysis in SPSS

    Hi all, Im trying to do a matched paired analysis on some data. I have two groups of children, matched by age and sex. Each pair has been given a...

    Started by tommecrow‎, 02-23-2014 03:37 AM
    • Replies: 1
    • Views: 4,215
    02-23-2014, 04:09 PM Go to last post
  41. Overdispersions and logistic regression

    Note the following comment on this: I have never been clear what the difference between grouped and ungrouped data is. My elements, notably...

    Started by noetsi‎, 09-19-2014 09:26 AM
    • Replies: 8
    • Views: 4,212
    09-20-2014, 08:04 AM Go to last post
  42. Comparing curves fitted to two quadratic regressions

    Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

    Started by Ri89‎, 03-08-2012 07:19 AM
    curves, quadratic regression
    • Replies: 2
    • Views: 4,207
    03-28-2012, 07:30 PM Go to last post
  43. beta = r, so can beta be greater than 1.0?

    I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

    Started by bruin‎, 11-11-2013 03:40 PM
    • Replies: 13
    • Views: 4,197
    11-14-2013, 01:15 AM Go to last post
  44. Correcting for omitted variable bias without including problem variables?

    Hi All, I asked something similar earlier but I don't think I was very clear (so I will try again). I want to run a regression, let's say it is...

    Started by Salohcin‎, 06-26-2013 01:12 PM
    • Replies: 3
    • Views: 4,196
    06-26-2013, 02:55 PM Go to last post
  45. centered polynomials

    in a model involving Y= B0 + B1X1 + B2X2^2, how does centering the model affect the parameters. why does the hypothesis test associated with B2...

    Started by floriandotti‎, 11-23-2010 12:09 AM
    • Replies: 1
    • Views: 4,195
    11-23-2010, 01:01 AM Go to last post
  46. Multiple Regression: Dependent Variable has sub-categories

    I want to be able to predict Total Spare Part Costs (Y). There are 2 types of spare parts contributing to the total costs. Let Spare Part 1 = SP1...

    Started by m007836‎, 07-17-2011 08:30 PM
    • Replies: 4
    • Views: 4,192
    07-31-2011, 06:07 PM Go to last post
  47. Dummy coding in linear regression, with an interaction

    I am using linear regression with a categorial variable (3 levels of stress manipulation) and continuous variables. I am unsure how to dummy code my...

    Started by Liz4218‎, 10-06-2013 03:08 AM
    • Replies: 1
    • Views: 4,192
    10-30-2013, 09:29 PM Go to last post
  48. How to conduct a repeated measures regression with ordinal outcome variable?

    Hi, I am trying to predict an ordinal variable (success: 0, 1, 2, 3). I have 3 predictor variables I want to include in the analyses together with...

    Started by Sausage‎, 12-04-2010 04:03 PM
    • Replies: 0
    • Views: 4,188
    12-04-2010, 04:03 PM Go to last post
  49. Question How can I handle an independent variable with many zeros?

    Hey everyone! I'm currently working on my Master's thesis and am slightly stuck in the analytical part. For my research, I am trying to figure out...

    Started by student9090‎, 06-18-2013 08:57 AM
    • Replies: 3
    • Views: 4,188
    06-19-2013, 08:25 AM Go to last post
  50. 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
  51. Parameter estimation - which method?

    I am new to parameter estimation. It is not clear for me which method is the best to use to estimate parameter of my model: my statistical model has...

    Started by hase‎, 06-11-2012 11:01 AM
    • Replies: 14
    • Views: 4,177
    07-18-2012, 04:06 AM Go to last post
  52. Logistic regression - help needed

    Hi, I want to predict a dependent variable from a set of (3) factor scores, as independent variables. The problem is that one of those scores...

    Started by Kara‎, 06-18-2011 05:21 AM
    • Replies: 2
    • Views: 4,172
    06-19-2011, 01:42 AM Go to last post
  53. complex survey analysis and weight variables in proc surveylogistic

    I am analyzing the effect of Calcium on Obesity in adults based on the NHANES dataset. I have two questions. First, since I am combining two day...

    Started by sabina9‎, 04-18-2011 10:26 AM
    • Replies: 1
    • Views: 4,169
    04-18-2011, 11:05 AM Go to last post
  54. 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: 4,163
    04-19-2011, 10:17 AM Go to last post
  55. statistical analysis of global warming/fossil fuels

    Hello, I have to write a paper for a class (environmental management). I've been thinking quite a bit about global warming/weather trends and how...

    Started by Analytics‎, 01-11-2008 08:14 PM
    • Replies: 0
    • Views: 4,157
    01-11-2008, 08:14 PM Go to last post
  56. So many variables--how to approach this?

    I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

    Started by brooklynqueen‎, 08-10-2010 10:31 PM
    • Replies: 9
    • Views: 4,157
    08-11-2010, 05:24 PM Go to last post
  57. problem with independent variables

    Hello, I need your advice. I have a data file, with a binary dependent variable and some independent ones. For each person (case), there were 3...

    Started by WeeG‎, 08-19-2010 04:26 AM
    • Replies: 4
    • Views: 4,155
    08-20-2010, 09:12 PM Go to last post
  58. dummy coding help for cat variables

    I have a questionnaire with 28 items - 20 items are Likert attitude questions. In fact there are 5 main variables (constructs?) being measured by 4...

    Started by ehb23‎, 12-06-2006 07:26 PM
    • Replies: 0
    • Views: 4,153
    12-06-2006, 07:26 PM Go to last post
  59. How to develop a regression expression using factor scores?

    Hi, I have four factors for fourteen variables. I want to develop a regression expression for a dependent variable using the correlated variables....

    Started by aceprod51‎, 01-21-2007 03:22 PM
    • Replies: 1
    • Views: 4,148
    01-23-2007, 10:05 PM Go to last post
  60. generalized least squares

    Hello. How can I modify least square linear regression method in order to fit a straight line to data with non gaussian error (such as Levy, Poisson...

    Started by skan‎, 07-29-2007 01:21 PM
    • Replies: 6
    • Views: 4,148
    08-02-2007, 05:53 AM Go to last post

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