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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. statistical robustness analysis in minitab

    Hello! I was asked to comment on statistical robustness analysis in minitab, but honestly I don't know much about it. Can anyone help me...

    Started by kaczka03‎, 11-29-2015 04:11 PM
    • Replies: 0
    • Views: 1,385
    11-29-2015, 04:11 PM Go to last post
  2. 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, 11-28-2015 11:06 AM
    • Replies: 3
    • Views: 1,868
    11-28-2015, 10:18 PM Go to last post
  3. 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: 2,114
    11-27-2015, 03:32 PM Go to last post
  4. [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: 1,341
    11-27-2015, 03:56 AM Go to last post
  5. 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: 924
    11-26-2015, 12:10 PM Go to last post
  6. 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: 1,552
    11-25-2015, 05:20 PM 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: 2,046
    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: 1,139
    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: 1,142
    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: 1,302
    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: 773
    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: 1,095
    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: 959
    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: 1,334
    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: 1,495
    11-20-2015, 04:24 AM Go to last post
  16. 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: 3,923
    11-17-2015, 06:37 PM Go to last post
  17. 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: 1,092
    11-17-2015, 05:44 AM Go to last post
  18. 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: 1,643
    11-14-2015, 04:36 PM Go to last post
  19. 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: 886
    11-14-2015, 03:20 AM Go to last post
  20. 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: 1,130
    11-13-2015, 10:29 PM Go to last post
  21. 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: 1,003
    11-12-2015, 07:18 AM Go to last post
  22. 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: 2,253
    11-09-2015, 12:41 PM Go to last post
  23. 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: 1,306
    11-08-2015, 09:46 AM Go to last post
  24. 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: 1,422
    11-07-2015, 08:33 AM Go to last post
  25. 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: 1,236
    11-06-2015, 08:20 PM Go to last post
  26. 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: 1,203
    11-06-2015, 06:19 PM Go to last post
  27. 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: 844
    11-05-2015, 07:31 PM Go to last post
  28. 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: 780
    11-05-2015, 05:42 AM Go to last post
  29. 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: 1,192
    11-04-2015, 10:55 PM Go to last post
  30. 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: 2,804
    11-03-2015, 02:11 PM Go to last post
  31. 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 10:27 AM
    • Replies: 1
    • Views: 2,276
    10-29-2015, 09:05 PM Go to last post
  32. 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 12:04 AM
    • Replies: 1
    • Views: 1,067
    10-29-2015, 02:34 AM Go to last post
  33. 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 07:39 PM
    hat matrix, regression
    • Replies: 0
    • Views: 1,185
    10-28-2015, 07:39 PM Go to last post
  34. 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 03:45 PM
    • Replies: 0
    • Views: 974
    10-28-2015, 03:45 PM Go to last post
  35. 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 12:08 PM
    • Replies: 1
    • Views: 987
    10-27-2015, 01:32 PM Go to last post
  36. 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 02:33 AM
    • Replies: 2
    • Views: 1,774
    10-26-2015, 12:49 PM Go to last post
  37. 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 11:46 AM
    • Replies: 2
    • Views: 991
    10-23-2015, 01:40 PM Go to last post
  38. 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 01:43 PM
    • Replies: 10
    • Views: 1,483
    10-22-2015, 04:03 PM Go to last post
  39. 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 08:12 AM
    • Replies: 2
    • Views: 917
    10-22-2015, 09:19 AM Go to last post
  40. 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 07:29 AM
    • Replies: 1
    • Views: 1,181
    10-22-2015, 06:18 AM Go to last post
  41. 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 02:22 PM
    • Replies: 0
    • Views: 859
    10-20-2015, 02:22 PM Go to last post
  42. 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 04:59 AM
    • Replies: 0
    • Views: 1,186
    10-19-2015, 04:59 AM Go to last post
  43. 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 09:40 AM
    durbin-watson, ols regression
    • Replies: 0
    • Views: 1,901
    10-17-2015, 09:40 AM Go to last post
  44. 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 02:59 PM
    ordinal regression, regression analysis
    • Replies: 3
    • Views: 2,621
    10-17-2015, 06:19 AM Go to last post
  45. 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 06:56 AM
    • Replies: 5
    • Views: 1,851
    10-17-2015, 04:20 AM Go to last post
  46. 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 05:44 PM
    crossed, mixed effects model, multi-level data, nested
    • Replies: 0
    • Views: 1,040
    10-16-2015, 05:44 PM Go to last post
  47. 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 09:12 AM
    • Replies: 2
    • Views: 1,680
    10-16-2015, 04:18 PM Go to last post
  48. 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 12:29 PM
    effect coding, multinomial logit, reference category, standard error
    • Replies: 7
    • Views: 2,080
    10-15-2015, 09:55 AM Go to last post
  49. 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 04:01 PM
    ancova, anova ecology biology, combining items, regression help, testing
    • Replies: 0
    • Views: 980
    10-14-2015, 04:01 PM Go to last post
  50. 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 12:06 PM
    • Replies: 1
    • Views: 2,674
    10-11-2015, 04:11 PM Go to last post
  51. 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 07:39 PM
    calculus, lab data, physics, regression analysis
    • Replies: 4
    • Views: 2,066
    10-11-2015, 01:56 PM Go to last post
  52. 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 08:30 AM
    • Replies: 6
    • Views: 1,749
    10-10-2015, 02:40 PM Go to last post
  53. 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 01:04 PM
    • Replies: 4
    • Views: 1,682
    10-10-2015, 09:41 AM Go to last post
  54. 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 03:16 PM
    • Replies: 3
    • Views: 1,336
    10-07-2015, 04:05 PM Go to last post
  55. 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 09:37 AM
    • Replies: 2
    • Views: 1,221
    10-06-2015, 12:26 PM Go to last post
  56. 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 10:46 AM
    partial regression, partial regression plot, regression, scatter plot, scatterplot
    • Replies: 0
    • Views: 1,488
    10-06-2015, 10:46 AM Go to last post
  57. 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 07:56 AM
    loocv, regression
    • Replies: 3
    • Views: 2,448
    10-06-2015, 01:09 AM Go to last post
  58. Problem with Greene Econometric Analysis 7th Edition demand example page 110

    Strange question, I know, but I am unable to reproduce the results shown when he adds a lagged dependent variable to his gasoline demand function....

    Started by Rod‎, 10-04-2015 09:53 PM
    • Replies: 0
    • Views: 1,283
    10-04-2015, 09:53 PM Go to last post
  59. Automatically finding relationships between 3 or more variables

    Hello, Total newbie here - but I'm hoping someone can help me out. I have finished running a multiple regression analysis and have my results....

    Started by Tzo‎, 10-02-2015 07:37 PM
    • Replies: 0
    • Views: 743
    10-02-2015, 07:37 PM Go to last post
  60. Ordinal regression shows negative effect when spearman correlation shows positive

    I running a regression model where a variable is indicated to have a negative impact on the predicted variable: Estimate Std....

    Started by micdhack‎, 09-30-2015 12:26 PM
    • Replies: 8
    • Views: 2,266
    10-01-2015, 02:35 PM Go to last post

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