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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. What does intercept mean in regression analysis?

    I have searched it on the web but I just cant understand it. To better understand it I did one example my self. Can somebody explain me this? >...

    Started by Mr Good News‎, 12-10-2015 02:53 AM
    • Replies: 3
    • Views: 1,424
    12-12-2015, 11:59 AM Go to last post
  2. Multi variable Regression

    Dear Regression Experts, I am new in this field, I have set of data of about 1 lac entries having a total of 10 variables of which 9 are input...

    Started by wali‎, 12-10-2015 07:27 AM
    • Replies: 4
    • Views: 1,120
    12-12-2015, 01:34 AM Go to last post
  3. Calculate estimated median survival time (by hand)

    So I have some SAS code: proc lifereg data=surv_data; model event_time * censor(1) = var1 var2 var3 / distribution=weibull; output...

    Started by lancearmstrong1313‎, 12-10-2015 01:06 PM
    • Replies: 5
    • Views: 1,095
    12-11-2015, 01:05 PM Go to last post
  4. Tutorial Tobit Eviews 9

    The tobit models, Also called a censored regression models (Tutorial Tobit Eviews 9) (Guide Tobit Eviews 9) (Regression Tobit Eview 9), is designed...

    Started by OlhDt_semarang‎, 12-11-2015 12:53 AM
    (tutorial tobit eviews 9, guide tobit eviews 9, regression tobit eview 9
    • Replies: 0
    • Views: 2,618
    12-11-2015, 12:53 AM Go to last post
  5. Eviews 9 Tutorial Two Stage Least Squares

    Two-stage least squares (TSLS) is a special case of instrumental variables regression. As the name Suggests, there are two distinct stages in the...

    Started by OlhDt_semarang‎, 12-09-2015 08:46 PM
    guide eview 9, tutorial eviews 9
    • Replies: 0
    • Views: 1,846
    12-09-2015, 08:46 PM Go to last post
  6. Ordered Logistic Regression - proportional odds

    Hey, for a homework paper I have analyze some data. Its about how social networks are related to health. My depended var is an ordinal variable...

    Started by Hansbusch‎, 12-07-2015 07:42 AM
    • Replies: 0
    • Views: 916
    12-07-2015, 07:42 AM Go to last post
  7. Exam Question Help

    Hey Guys, After a worked solution for this previous exam question, if that's too much to ask, I understand, could you then point me to some...

    Started by IRK‎, 12-07-2015 02:15 AM
    • Replies: 1
    • Views: 770
    12-07-2015, 03:51 AM Go to last post
  8. Regression analysis with multicollinearity

    I am using jmp software for analysis... I am looking at prognostic factors that influence survival of patients with a specific type of cancer. ...

    Started by yellowsubmarine_7‎, 12-06-2015 04:55 PM
    regression analysis
    • Replies: 1
    • Views: 710
    12-06-2015, 06:05 PM Go to last post
  9. Compute and interpretation of logarithmic dependent variable

    Hello everyone, For a paper I am using a model from another paper. However, I have some difficulties determining how I should generate this...

    Started by Jantje Beton‎, 12-06-2015 01:16 PM
    • Replies: 0
    • Views: 550
    12-06-2015, 01:16 PM Go to last post
  10. 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: 6
    • Views: 1,316
    12-06-2015, 11:03 AM Go to last post
  11. Rare suppressor effect?

    Hey, I recently discovered a somewhat surprising result in a hierarchical regression: I have three predictors (C M N) and one outcome (D). ...

    Started by asbjorng‎, 03-18-2014 03:40 AM
    • Replies: 2
    • Views: 1,034
    12-06-2015, 06:45 AM Go to last post
  12. Applying multiple regression results to new data SPSS

    My study involves testing infants at multiple time points using a number of behavioural tests. I used a multiple regression to establish which...

    Started by rdavis09‎, 12-05-2015 10:05 AM
    • Replies: 3
    • Views: 1,192
    12-06-2015, 04:17 AM Go to last post
  13. Integrating a continuous predictor in multiple logistic regression?

    Hi everyone, I was wondering if you could help tell me if this would be possible. I'm doing a health research project were I am using a lot of...

    Started by derivativegradient‎, 12-05-2015 10:55 PM
    • Replies: 1
    • Views: 582
    12-06-2015, 03:50 AM Go to last post
  14. Estimate a Logistic Regression Model

    Hi guys, I want to estimate a logistic regression model's equation based on observed data and get the coefficients to extrapolate further. I have...

    Started by Oberon‎, 12-03-2015 08:40 AM
    logistic, regression
    • Replies: 6
    • Views: 1,600
    12-04-2015, 01:18 AM Go to last post
  15. Specifying the correct model in Oxmetrics

    I have an equation: Y = c + b1X1 + b2X2 + b3X3 Y = Cryptographic ability (scaled 0-200) X1 = Pattern recognition skills (scaled 0-20) X2 =...

    Started by TimeMachine‎, 12-03-2015 12:43 AM
    • Replies: 0
    • Views: 589
    12-03-2015, 12:43 AM Go to last post
  16. Hypothesis test on number of votes accidentially given to Buchanan

    Hey :wave: I have the following task: Estimate the number of votes, denoted v, in Palm Beach that are accidentially given to Buchanan by...

    Started by Hopeless‎, 12-01-2015 03:43 AM
    • Replies: 0
    • Views: 715
    12-01-2015, 03:43 AM Go to last post
  17. 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: 894
    11-29-2015, 04:11 PM Go to last post
  18. 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: 1,202
    11-28-2015, 10:18 PM Go to last post
  19. 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: 1,522
    11-27-2015, 03:32 PM Go to last post
  20. [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: 968
    11-27-2015, 03:56 AM Go to last post
  21. 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: 614
    11-26-2015, 12:10 PM Go to last post
  22. 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: 999
    11-25-2015, 05:20 PM Go to last post
  23. 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: 1,495
    11-24-2015, 09:32 AM Go to last post
  24. 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: 706
    11-24-2015, 07:34 AM Go to last post
  25. 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: 892
    11-24-2015, 07:30 AM Go to last post
  26. 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: 893
    11-23-2015, 11:40 AM Go to last post
  27. 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: 531
    11-22-2015, 04:50 PM Go to last post
  28. 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: 739
    11-21-2015, 12:29 PM Go to last post
  29. 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: 656
    11-21-2015, 10:25 AM Go to last post
  30. [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: 933
    11-21-2015, 02:55 AM Go to last post
  31. 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: 974
    11-20-2015, 04:24 AM Go to last post
  32. 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: 2,801
    11-17-2015, 06:37 PM Go to last post
  33. 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: 671
    11-17-2015, 05:44 AM Go to last post
  34. 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: 1,193
    11-14-2015, 04:36 PM Go to last post
  35. 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: 660
    11-14-2015, 03:20 AM Go to last post
  36. 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: 753
    11-13-2015, 10:29 PM Go to last post
  37. 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: 644
    11-12-2015, 07:18 AM Go to last post
  38. 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: 1,503
    11-09-2015, 12:41 PM Go to last post
  39. 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: 896
    11-08-2015, 09:46 AM Go to last post
  40. 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: 889
    11-07-2015, 08:33 AM Go to last post
  41. 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: 787
    11-06-2015, 08:20 PM Go to last post
  42. 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: 765
    11-06-2015, 06:19 PM Go to last post
  43. 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: 603
    11-05-2015, 07:31 PM Go to last post
  44. 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: 573
    11-05-2015, 05:42 AM Go to last post
  45. 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: 864
    11-04-2015, 10:55 PM Go to last post
  46. 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: 1,749
    11-03-2015, 02:11 PM Go to last post
  47. 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: 1,589
    10-29-2015, 09:05 PM Go to last post
  48. 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: 663
    10-29-2015, 02:34 AM Go to last post
  49. 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: 797
    10-28-2015, 07:39 PM Go to last post
  50. 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: 686
    10-28-2015, 03:45 PM Go to last post
  51. 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: 697
    10-27-2015, 01:32 PM Go to last post
  52. 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: 1,281
    10-26-2015, 12:49 PM Go to last post
  53. 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: 717
    10-23-2015, 01:40 PM Go to last post
  54. 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: 1,125
    10-22-2015, 04:03 PM Go to last post
  55. 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: 656
    10-22-2015, 09:19 AM Go to last post
  56. 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: 758
    10-22-2015, 06:18 AM Go to last post
  57. 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: 610
    10-20-2015, 02:22 PM Go to last post
  58. 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: 591
    10-19-2015, 04:59 AM Go to last post
  59. 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: 1,050
    10-17-2015, 09:40 AM Go to last post
  60. 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: 1,527
    10-17-2015, 06:19 AM Go to last post

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