1. 10-14-2010
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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Logit:why aren't my exponentiated coefficients equaling my odds ratio (for nominal x)

    I'm running logit in JMP. My understanding is that if you exponentiate the coefficients, you get the change in odds ratios from a 1 unit change in X....

    Started by Chriscic‎, Today 11:06 AM
    • Replies: 2
    • Views: 61
    Today, 04:22 PM Go to last post
  2. cross-validated AUC

    Hello All, I hope the thread's title makes sense to you. I need to perform internal Cross-Validation using k-fold CV (needless to say, to assess how...

    Started by gianmarco‎, 11-25-2015 02:42 AM
    • Replies: 10
    • Views: 325
    Yesterday, 03:32 PM Go to last post
  3. [Logistic regression: Stepwise] Why does the model keep a non-significant predictor?

    Hello there, I'm running a logistic regression with four independent variables. I use the Stepwise: Backwards LR method for the regression. ...

    Started by MelinJD‎, 11-24-2015 11:01 AM
    • Replies: 2
    • Views: 128
    Yesterday, 03:56 AM Go to last post
  4. Comparing AIC between OLS and Quantile regression

    Hello all, Is it acceptable to compare the AIC of an OLS linear model to the AIC of a quantile linear model to see which is the better fit? I...

    Started by Frost_Maggot‎, 11-26-2015 12:10 PM
    • Replies: 0
    • Views: 70
    11-26-2015, 12:10 PM Go to last post
  5. Linear regression - help with meeting/avoiding the assumptions

    Hello all! I am tasked with fitting a linear model with one dependent variable y and one independent variable x. I am using R for the analysis....

    Started by Frost_Maggot‎, 11-25-2015 05:07 PM
    • Replies: 2
    • Views: 142
    11-25-2015, 05:20 PM Go to last post
  6. Logistic Regression of NFL Data

    Week 5 picks from a logistic regression model for the NFL: http://trevorbischoff.com/nfl-2015-week-5-predictions/

    Started by LeeBalto‎, 10-07-2015 09:00 AM
    logistic regression, modeling, prediction
    • Replies: 5
    • Views: 396
    11-25-2015, 05:22 AM Go to last post
  7. Question Ranking a Location using Linear Regression

    Hi, I am facing a strange problem with a software patented in the USA. It is a location evaluation software, which offers insights on determining...

    Started by Confidential‎, 11-22-2015 06:23 AM
    • Replies: 6
    • Views: 313
    11-24-2015, 09:32 AM Go to last post
  8. Variable Analysis

    I'm new to using regression and was curious how most of you go about creating a tightly fit model. I've always tried to get all my variables under a...

    Started by trampledunderfoot‎, 11-23-2015 11:35 PM
    • Replies: 1
    • Views: 122
    11-24-2015, 07:34 AM Go to last post
  9. ANCOVA - can I delete a very significant variable from a model's equation?

    Hi all, I undertook a sensitivity analysis to study the contribution of explanatory variables to soil organic carbon variations. Here, the...

    Started by CGG‎, 11-22-2015 05:38 PM
    ancova, variable in model
    • Replies: 5
    • Views: 219
    11-24-2015, 07:30 AM Go to last post
  10. Multiple linear regression using moderators

    Hi guys, first post here! First some background information: I am doing a study that examines whether patents and trademarks (2 independent...

    Started by Inter‎, 11-23-2015 11:40 AM
    • Replies: 0
    • Views: 129
    11-23-2015, 11:40 AM Go to last post
  11. Instrumental variable approach to a model with squared and interaction terms

    Moderator, please delete this post.

    Started by kiton‎, 11-22-2015 04:50 PM
    endogeneity, instruments, least squares regression
    • Replies: 0
    • Views: 118
    11-22-2015, 04:50 PM Go to last post
  12. Degree of Freedom in extra sum of squares

    Give the degrees of freedom associated with a)SSR(X_1|X_2) b)SSR(X_2|X_1,X_3) c)SSR(X_1,X_2|X_3,X_4) d)SSR(X_1,X_2,X_3|X_4,X_5)

    Started by askazy‎, 11-21-2015 12:29 PM
    • Replies: 0
    • Views: 100
    11-21-2015, 12:29 PM Go to last post
  13. Regression analysis in MS Excel

    I have a very simple model, in which Y is the average of three variables (A, B and C). Now I would like to know how much of the variance in Y is...

    Started by Stat789‎, 11-21-2015 10:25 AM
    • Replies: 0
    • Views: 99
    11-21-2015, 10:25 AM Go to last post
  14. [Logistic Regression] - Is it possible to compare the outcomes?

    Dear all, First time poster here. I'm currently working on my thesis and i'm stuck with a complex matter which i hope you guys can help me with. I...

    Started by Tway‎, 11-19-2015 03:47 PM
    logistic regression
    • Replies: 1
    • Views: 154
    11-21-2015, 02:55 AM Go to last post
  15. Implement Young's Information Criterion in Matlab for analyzing recursive arx models

    Hey For an assignment we want to implement the YIC instead of Aikake's information criterion because it's more suitable to fit our data. We have...

    Started by Alex40014‎, 11-20-2015 04:24 AM
    • Replies: 0
    • Views: 118
    11-20-2015, 04:24 AM Go to last post
  16. Postive correlation but negative coefficient in regression??

    Im a little confused by some results I have..... I have two predictor variables and an outcome variable. The first predictor is positively...

    Started by statto‎, 08-20-2011 10:39 AM
    2 Pages
    1 2
    rho/beta conflict, suppression
    • Replies: 22
    • Views: 32,139
    11-19-2015, 02:12 PM Go to last post
  17. regression on age groups

    Dear All, I have the following question: Estimate a simple regression model of ‘libertarian-authoritarian’ attitude as a function of age groups...

    Started by sugabird22‎, 11-17-2015 08:55 AM
    age, group, regression
    • Replies: 5
    • Views: 206
    11-17-2015, 06:37 PM Go to last post
  18. Will Cochrane-Orcutt process remedy heteroskedasticity? Using GRETL

    I tried searching for this in the forums but cant seem to find anything. I'm probably just wording it wrong. I'm working on a research project for...

    Started by NorCalLove‎, 11-17-2015 12:19 AM
    • Replies: 1
    • Views: 145
    11-17-2015, 05:44 AM Go to last post
  19. Post Model to use, fractions as independent and dependent variables

    Hi, I have some background on doing regression analysis, however never on fractional variables. My question is related to model selection on...

    Started by ddali‎, 11-14-2015 10:13 AM
    fraction, regression analysis
    • Replies: 1
    • Views: 234
    11-14-2015, 04:36 PM Go to last post
  20. Which R-Package / function is appropriate? fixed variance, random coefficients and AR

    Hi, I have time-dependent data which show an inreasing variance with a certain covariate X (which can be modelled using a fixed cariance...

    Started by mmercker‎, 11-14-2015 03:20 AM
    autoregression, fixed variance, regression analysis
    • Replies: 0
    • Views: 159
    11-14-2015, 03:20 AM Go to last post
  21. Residual Plots. What's going on.

    I'm running some analysis on grades in different subjects and seeing if being involved in this outside activity has an impact on grades. I am looking...

    Started by econh‎, 11-13-2015 10:07 PM
    • Replies: 1
    • Views: 145
    11-13-2015, 10:29 PM Go to last post
  22. Multivariate regression with paired samples?

    Hello, First time poster here. I have data from two groups of people recorded during two different conditions. I would like to study how the...

    Started by mnd‎, 04-02-2013 01:44 PM
    • Replies: 8
    • Views: 2,480
    11-13-2015, 01:47 PM Go to last post
  23. Regression with Differential equations (ODEs / PDEs)

    Hi, in the field of mathematical modelling of biological or physical processes, most of them cannot be described by simple (linear or nonlinear)...

    Started by mmercker‎, 11-12-2015 07:18 AM
    differential equation, ode, pde, regression
    • Replies: 0
    • Views: 147
    11-12-2015, 07:18 AM Go to last post
  24. Interpretation of the squared term coefficient in the presence of interaction

    Hello dear form members, Please consider the following regression model: y = a + b1x1 + b2x1^2 + b3x2 + b4x1*x2 + e, Note that x1 is (1)...

    Started by kiton‎, 11-11-2015 04:09 PM
    • Replies: 5
    • Views: 304
    11-12-2015, 05:59 AM Go to last post
  25. A coefficient to determine Variance

    Hi I am working on a system where temperature stabilises with distance but also increases/ decreases based on month/ hour. Is there a way to...

    Started by PYork‎, 11-09-2015 09:13 AM
    regression, variance
    • Replies: 1
    • Views: 212
    11-09-2015, 12:41 PM Go to last post
  26. Increasing variables decreases DFs?

    I'm sorry if this is a total noob question, but I cannot figure it out. When I'm adding variables into my regression into STATA, the degrees of...

    Started by sociologydude76‎, 11-07-2015 02:47 PM
    degrees of freedom, regression, stata
    • Replies: 2
    • Views: 244
    11-08-2015, 09:46 AM Go to last post
  27. GEE: best model by comparing residuals (SPSS)

    Hello there, I am doing a study on vigilance research by comparing different EEG methods (ERP, FFT and ERD) regarding their predictive power of...

    Started by FrankD‎, 11-07-2015 08:33 AM
    • Replies: 0
    • Views: 182
    11-07-2015, 08:33 AM Go to last post
  28. regression analysis for research

    hi there, working on a project in which we compare eye contrast among mammals at various points. We collected data (luminance value) for parts...

    Started by kelseyjo‎, 11-06-2015 08:20 PM
    • Replies: 0
    • Views: 144
    11-06-2015, 08:20 PM Go to last post
  29. Can you help me identify the right test for my data?

    I’m trying to identify the right statistical method to use. Here’s a case analogous to mine: Let’s say I’m interested in whether basketball team...

    Started by Frameshift‎, 11-06-2015 06:19 PM
    • Replies: 0
    • Views: 184
    11-06-2015, 06:19 PM Go to last post
  30. Adding main effects when main effects model is insignificant

    Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

    Started by bryantw‎, 11-05-2015 05:57 PM
    • Replies: 1
    • Views: 164
    11-05-2015, 07:31 PM Go to last post
  31. Factor scores or mean values?

    Dear all, I hope I am in the correct forum and you can help me. At the moment I pursue a survey study. In the survey I obtain items that shall...

    Started by Ute1985‎, 11-05-2015 05:42 AM
    • Replies: 0
    • Views: 160
    11-05-2015, 05:42 AM Go to last post
  32. Question related to Generalized Linear Mixed Model

    I'm working with a dataset containing the following: Fixed variables: Age, Body Size, Antler Size, Average Age Random variable: Animal ID...

    Started by Sightfish‎, 11-04-2015 12:18 PM
    • Replies: 2
    • Views: 199
    11-04-2015, 10:55 PM Go to last post
  33. R Squared and dummy variables

    Hey, If you changed your model from one variable to a number of dummy variables, would the R^2 increase considerably, supposing that the dummy...

    Started by mhider‎, 11-01-2015 02:36 PM
    • Replies: 5
    • Views: 307
    11-03-2015, 02:11 PM Go to last post
  34. Odds ratio using the negative log-log link functin in ordinal logistic regression

    Hello, Below is a description of a statistical problem and questions for which I need clarification. The data I'm working on are from an online...

    Started by GLepage‎, 10-27-2015 11:27 AM
    • Replies: 1
    • Views: 201
    10-29-2015, 10:05 PM Go to last post
  35. Country-level Clustering

    Hi All, I have a database on firms that went bankrupt/not bankrupt from 1999-2011 across 30+ countries. I have included year fixed effects in my...

    Started by lucas111‎, 10-29-2015 01:04 AM
    • Replies: 1
    • Views: 197
    10-29-2015, 03:34 AM Go to last post
  36. Help with Hat Matrix

    considering the model Yi=β0+β1Xi+ϵi, i=1,2,3,…,n how can i calculate the hat matrix and what would element hij be ? thanks

    Started by jerry212‎, 10-28-2015 08:39 PM
    hat matrix, regression
    • Replies: 0
    • Views: 155
    10-28-2015, 08:39 PM Go to last post
  37. Question Partial Correlation question help

    Hi, I was wondering if you could help me. I've been set the problem below. I know how to work out the Partial Correlation and I could do it for A1 or...

    Started by jamesyp21‎, 10-28-2015 04:45 PM
    • Replies: 0
    • Views: 155
    10-28-2015, 04:45 PM Go to last post
  38. Interpreting a IV variable whose values have been changed

    Hello all, I'd just like to get advice on the following: I've got a few independent variables which had values ranging from -2.5 to 2.5. I...

    Started by ChrisUCT‎, 10-27-2015 01:08 PM
    • Replies: 1
    • Views: 177
    10-27-2015, 02:32 PM Go to last post
  39. Interaction/moderation in probit/logit

    Dear all, in my studies some (maybe trivial...?) questions on interaction/moderation in probit/logit regression came up. Imagine the following...

    Started by Ute‎, 10-17-2015 03:33 AM
    • Replies: 2
    • Views: 253
    10-26-2015, 01:49 PM Go to last post
  40. correlation in multi-level model

    In a multi-livel model where level 1 is within-person and level 2 is between-person, can level 1 be a simple correlation between two within-person...

    Started by ecnusbau‎, 10-23-2015 12:46 PM
    • Replies: 2
    • Views: 304
    10-23-2015, 02:40 PM Go to last post
  41. OR improving inmultyvariate logistic regression

    Hi! Does it make sense that odds ratio are getting better (higher) and more significant when moving from a univriate to a multivariate regression...

    Started by Doobdoob‎, 10-19-2015 02:43 PM
    • Replies: 10
    • Views: 401
    10-22-2015, 05:03 PM Go to last post
  42. Testing the equality of the Residual Sum of Squares of two linear models

    I have two models of a dependent variable: Y = a1 + b1X1 and Y = a2 + b2X2 The variances around the lines of least error are important...

    Started by BigBugBuzz‎, 10-22-2015 09:12 AM
    • Replies: 2
    • Views: 195
    10-22-2015, 10:19 AM Go to last post
  43. Question Need help with parallel mediated quadratic regression

    Dear friends, currently I am stuck with a problem I can't solve on my own - I hope some of you might have a bright idea :) I am looking for...

    Started by robeh‎, 10-19-2015 08:29 AM
    • Replies: 1
    • Views: 191
    10-22-2015, 07:18 AM Go to last post
  44. Help setting up a dataset for multi-level modeling

    Hi everyone, I'm new to multi-level modeling (MLM) and have a question about how to set up my data. My study design involved two between...

    Started by kelly.s‎, 10-20-2015 03:22 PM
    • Replies: 0
    • Views: 202
    10-20-2015, 03:22 PM Go to last post
  45. Redesigning a questionnaire (a bit long...)

    A quick background: I am trying to evaluate a questionnaire used to asses patients. It is used around the world to establish whether a patients...

    Started by j_cocker‎, 10-19-2015 05:59 AM
    • Replies: 0
    • Views: 127
    10-19-2015, 05:59 AM Go to last post
  46. Durbin-Watson bound dU>2.0

    Hello. I was wondering, how to interpret bounds of Durbin-Watson test (dU, dL) if dU is greater than 2.0. I know that it is an extreme case, but just...

    Started by harel‎, 10-17-2015 10:40 AM
    durbin-watson, ols regression
    • Replies: 0
    • Views: 205
    10-17-2015, 10:40 AM Go to last post
  47. regression for ordinal data?

    Hi All, I am looking at data showing injury to intervertebral discs. Injuries are graded on a 4 point scale with 0 being no damage and 3 being...

    Started by mac101‎, 09-27-2015 03:59 PM
    ordinal regression, regression analysis
    • Replies: 3
    • Views: 460
    10-17-2015, 07:19 AM Go to last post
  48. Does the intercept p value matter?

    Hi everyone, I work on a model with logistic regression as a result I have intercept value = 0.06 , with a p-value = 0.86. Does this model...

    Started by valko‎, 10-16-2015 07:56 AM
    • Replies: 5
    • Views: 321
    10-17-2015, 05:20 AM Go to last post
  49. Multilevel model with crossed random effects - does this model make sense?

    I have a complex design and haven't found similar examples online. I'd really appreciate any views on the way I modelled it. At a first stage, 19...

    Started by lucnv‎, 10-16-2015 06:44 PM
    crossed, mixed effects model, multi-level data, nested
    • Replies: 0
    • Views: 182
    10-16-2015, 06:44 PM Go to last post
  50. Durbin-Watson

    Hi, Do I need to run a Durbin-Watson test if I am finding regressions for the number of second-language words learnt in a week based on age in...

    Started by becread95‎, 04-29-2015 10:12 AM
    • Replies: 2
    • Views: 370
    10-16-2015, 05:18 PM Go to last post
  51. SE of Reference category in Multinomial Logit Model

    I used R to fit a Multinomial Logit model to my data. The data includes some categorical variables as effect coded variables. For example, one...

    Started by Hendrik6‎, 10-14-2015 01:29 PM
    effect coding, multinomial logit, reference category, standard error
    • Replies: 7
    • Views: 360
    10-15-2015, 10:55 AM Go to last post
  52. Comparing two factors in five areas

    I recently compared two factors in five different areas testing diversity of one factor against another. (Diversity was made quantitative for...

    Started by Patatas345‎, 10-14-2015 05:01 PM
    ancova, anova ecology biology, combining items, regression help, testing
    • Replies: 0
    • Views: 166
    10-14-2015, 05:01 PM Go to last post
  53. GLM multivariate analysis with proportion & continuous data

    Hi there, I am looking to perform some multivariate analysis on my data (such as canonical correlation analysis or multivariate multiple...

    Started by cmg212‎, 07-27-2014 01:06 PM
    • Replies: 1
    • Views: 863
    10-11-2015, 05:11 PM Go to last post
  54. Physics Teacher with a question of appropriate use of regression equaitons

    Is it ever acceptable to replace discrete measured values with a continuous function if you are certain you have the right model? For the last...

    Started by Mr. O‎, 10-10-2015 08:39 PM
    calculus, lab data, physics, regression analysis
    • Replies: 4
    • Views: 354
    10-11-2015, 02:56 PM Go to last post
  55. Testing a log transformed reg model with the non-log transformed

    Hello, I was wondering how one test two regression models against each other. One being the log transformed of the other like this: y = var1 +...

    Started by nanana‎, 10-08-2015 09:30 AM
    • Replies: 6
    • Views: 411
    10-10-2015, 03:40 PM Go to last post
  56. lagged variables in a model

    Hi, i am reading an academic article and i am not sure i understood the model correctly. 1. It is written that the dependent variable is...

    Started by ophiroz‎, 09-15-2015 02:04 PM
    • Replies: 4
    • Views: 473
    10-10-2015, 10:41 AM Go to last post
  57. Time Series Analysis with Triple exponential smoothing

    What would be the best formula to forecast a weeks worth of daily data?

    Started by mdo8105‎, 10-07-2015 04:16 PM
    • Replies: 3
    • Views: 289
    10-07-2015, 05:05 PM Go to last post
  58. AIC backward selection - control variables

    Hej! I have a question concerning AIC backwards selection. I am doing a Linear Mixed effect model where I have one main predictor and several...

    Started by puenktchen‎, 10-06-2015 10:37 AM
    • Replies: 2
    • Views: 271
    10-06-2015, 01:26 PM Go to last post
  59. scatter plot for partial regression (in spss)

    Hi all I have an SPSS regression model in which I have a dependent variable, an independent variable and 4 covariates. I want to create a...

    Started by Lee R.‎, 10-06-2015 11:46 AM
    partial regression, partial regression plot, regression, scatter plot, scatterplot
    • Replies: 0
    • Views: 186
    10-06-2015, 11:46 AM Go to last post
  60. Leave one out cross validation

    Hi everybody, I've done a linear regression analysis with forward selection method. my number of observations are 32 and the final model selected 2...

    Started by Bahareh‎, 09-27-2015 08:56 AM
    loocv, regression
    • Replies: 3
    • Views: 374
    10-06-2015, 02:09 AM Go to last post

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