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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Significant Effects after Including Interaction Variable (?) :confused:

    Dear all, I hope you could help me with the following: I have tested two regression models, one with inependent variable A, B, C, D, E and one...

    Started by MDT‎, 03-26-2012 08:57 AM
    • Replies: 0
    • Views: 955
    03-26-2012, 08:57 AM Go to last post
  2. help appreciated with a validation exercise

    Hello all, I would really appreciate your help with some statistical analysis (yukh! haha!) A psychometric test has been mapped onto a companies...

    Started by mfarskoury‎, 03-26-2012 06:27 AM
    correlation, mapping, regression, validation
    • Replies: 0
    • Views: 731
    03-26-2012, 06:27 AM Go to last post
  3. Cool Regression with non- parametric data....

    Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

    Started by Rebecka‎, 03-24-2012 08:35 AM
    • Replies: 8
    • Views: 4,116
    03-26-2012, 03:42 AM Go to last post
  4. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 3,079
    03-25-2012, 01:03 PM Go to last post
  5. using a binary response for a mixed model

    Hello, My journey through mixed models (which is documented in past questions) has been an arduous one, however I appreciate being introduced to...

    Started by Dragonwalker‎, 03-25-2012 01:01 PM
    mixed-models binary lme4
    • Replies: 0
    • Views: 811
    03-25-2012, 01:01 PM Go to last post
  6. Panel Data (Random or Fixed)

    The r = a +bx. is the model There is data for 3 time periods. Are there fixed effects present? Estimate the parameters a and b. The code below...

    Started by samulleg364‎, 03-24-2012 06:45 PM
    • Replies: 0
    • Views: 964
    03-24-2012, 06:45 PM Go to last post
  7. Conditional regression

    Hi all, I am trying to run explanatory regression: Y = alpha + Beta1*X*I{X.*Y>0}+Beta2*X*I{X.*Y<=0} where I{} is indicator function Since...

    Started by JustinasBr‎, 03-24-2012 05:35 PM
    conditional regression, dependent variable on rhs
    • Replies: 2
    • Views: 1,517
    03-24-2012, 05:49 PM Go to last post
  8. Best way to control for weekdays when regressing sales data against time.

    I'm trying to use multiple regression to model sales data per day since Jan 1, 2010. I have established a "time index" to facilitate this. So...

    Started by machinist‎, 03-23-2012 11:21 AM
    • Replies: 2
    • Views: 1,390
    03-24-2012, 05:49 PM Go to last post
  9. Production function CES or Cobb-Douglas

    The data y v1 v2 p w1 w2 is data for the estimation of a production function y = f(v1 ,v2). Is Cobb-Douglas or CES? Estimate the parameters. (p=...

    Started by samulleg364‎, 03-24-2012 05:19 PM
    • Replies: 0
    • Views: 1,925
    03-24-2012, 05:19 PM Go to last post
  10. Random Effects Model and Serial Correlation

    I am working on a model where I am using a random effects model. This might seem like a simple question but does the use of the random effects model...

    Started by ohjosr‎, 03-24-2012 10:13 AM
    • Replies: 0
    • Views: 827
    03-24-2012, 10:13 AM Go to last post
  11. p-value of anova when comparing models

    I am asking a new question, however the dataset is related to other questions that I have posted. I am running lmer to determine which factors have...

    Started by Dragonwalker‎, 03-24-2012 09:59 AM
    • Replies: 0
    • Views: 1,072
    03-24-2012, 09:59 AM Go to last post
  12. multiple linear regression rejected - searching for alternative model

    Hey there! I am currently working on a regression model for a logistics problem which includes the transport time as dependent variable and a...

    Started by evident‎, 03-16-2012 09:54 AM
    • Replies: 1
    • Views: 1,112
    03-21-2012, 11:29 PM Go to last post
  13. I think I may finally understand, but a few questions

    Please note that you will find a simplified question below in case you do not have the time to check all of my scripts in the first two posts, but...

    Started by Dragonwalker‎, 03-20-2012 11:18 AM
    mixed-effects aic
    • Replies: 6
    • Views: 1,130
    03-21-2012, 12:28 PM Go to last post
  14. Post which regression analysis model shall i use?

    i am conducting a research on 9 insurance companies from which a 5 year data is collected. Thus, i have to use panel model, but which model fixed...

    Started by asamnew‎, 03-21-2012 04:55 AM
    • Replies: 0
    • Views: 820
    03-21-2012, 04:55 AM Go to last post
  15. Interpreting the conclusion of t-test and explaining the p-value

    Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

    Started by shle‎, 03-21-2012 02:13 AM
    • Replies: 0
    • Views: 4,046
    03-21-2012, 02:13 AM Go to last post
  16. Regress y on y-hat

    I need some help to prove that when you regress y on y-hat, the least squares regression line is y = y-hat. y = 0 + 1(y-hat). Thanks!

    Started by jwdzurik‎, 03-20-2012 02:49 PM
    • Replies: 0
    • Views: 1,222
    03-20-2012, 02:49 PM Go to last post
  17. Back-calculating correlation coefficient for transformed data

    Hi everyone, This is my first post on this board so please excuse if I sound like a n00b. I am doing a meta-analysis on plant physiology studies,...

    Started by qdread‎, 03-20-2012 01:08 PM
    • Replies: 0
    • Views: 1,345
    03-20-2012, 01:08 PM Go to last post
  18. Plotting

    Is there any way to plot a normal distributions density tilted on its side along the regression line of a simple linear regression. Meaby just 3-5...

    Started by thedreamshaper‎, 03-19-2012 05:14 PM
    • Replies: 2
    • Views: 1,212
    03-20-2012, 08:57 AM Go to last post
  19. Transforming dependent variable

    I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

    Started by judith_sw‎, 03-19-2012 08:10 AM
    • Replies: 3
    • Views: 3,812
    03-20-2012, 07:17 AM Go to last post
  20. Mediation question

    If you want to test the hypothesis that the gender difference in brooding will account for the gender difference in anxiety, what would be my...

    Started by pinkk‎, 03-18-2012 10:28 AM
    • Replies: 1
    • Views: 919
    03-18-2012, 04:13 PM Go to last post
  21. xtlogit coefficient interpretations

    I'm working on a project where I am using a logit model in the program Stata. I'm using the xtlogit command with panel data for city and years. My...

    Started by ohjosr‎, 03-17-2012 01:46 PM
    • Replies: 0
    • Views: 2,096
    03-17-2012, 01:46 PM Go to last post
  22. Coefficients of delta-lognormal modeling

    I am trying to understand delta-lognormal modeling. Please bear with me. I am applying this method to some fishery data. This method combines...

    Started by elopomorph‎, 06-25-2011 06:27 PM
    delta lognormal
    • Replies: 2
    • Views: 2,861
    03-16-2012, 11:38 AM Go to last post
  23. plotting moderation

    Hi, I know that for most of you this will sound like a stupid question but I am teaching myself regression and I am quite new.. Does it make sense...

    Started by Sciarada‎, 07-02-2011 09:25 PM
    moderation plot, multinomial regression
    • Replies: 1
    • Views: 2,413
    03-16-2012, 09:30 AM Go to last post
  24. Help! model comparison in logistic regression

    Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

    Started by caro‎, 03-15-2012 06:31 AM
    • Replies: 3
    • Views: 1,991
    03-16-2012, 03:17 AM Go to last post
  25. question on complete confounding and partial confounding in multiple regression

    While learning multiple regression, I once meet the concepts of “complete confounding” and “partial confounding” In the model, the response...

    Started by winecoding‎, 03-15-2012 10:37 PM
    • Replies: 2
    • Views: 3,928
    03-15-2012, 10:49 PM Go to last post
  26. When to address regression diagnostics on residuals?

    Hi, I have some data and have run a regression with all the variables in. I have then run the residual diagnostics but there are some issues. ...

    Started by regression_is_cool‎, 03-11-2012 08:44 AM
    • Replies: 1
    • Views: 1,196
    03-14-2012, 05:08 PM Go to last post
  27. Possible to analyze cross lag panel data with regression alone (no SEM)?

    I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 11,166
    03-14-2012, 10:57 AM Go to last post
  28. Help! Deriving a support vector machine

    Given a training set of points not necessarily linearly separable, we have an SVM obtained by minimizing \frac{1}{2}\lambda \left \| \mathbf{w}...

    Started by spidercano‎, 03-13-2012 08:33 PM
    • Replies: 0
    • Views: 1,030
    03-13-2012, 08:33 PM Go to last post
  29. Multiple logistic regression intercept

    Hello guys and gals, I'm having a me***own trying to understand exactly what the intercept of a multiple logistic regression is telling me/ or if...

    Started by drewmac‎, 01-19-2012 12:40 AM
    • Replies: 3
    • Views: 2,465
    03-13-2012, 12:29 AM Go to last post
  30. Regression with continuous and dummy-coded categorical variables

    Hi everyone, I am trying to figure out differences in the proportions of fallen trees in three ZONES, and nested within ZONES, differences in...

    Started by lken‎, 03-12-2012 06:14 PM
    • Replies: 0
    • Views: 1,347
    03-12-2012, 06:14 PM Go to last post
  31. growth regression results

    I am doing a standard neoclassical growth regression for the European member states for the period 1991-2010. I regress GDP per capita growth on...

    Started by tedylov‎, 03-12-2012 06:02 PM
    • Replies: 0
    • Views: 982
    03-12-2012, 06:02 PM Go to last post
  32. 1 predictor, 2 different values for baseline statistic & change statistic?

    Hi, I am conducting a Cox Regression for my first time. I created a simple model with only 1 predictor (categorical), one dependent variable...

    Started by unipsychologist1‎, 03-12-2012 04:09 PM
    change score, chi-sqaured, cox, survival analysis
    • Replies: 0
    • Views: 917
    03-12-2012, 04:09 PM Go to last post
  33. Regression on sales,markdown,avgstock

    OUTPUT 1: Call: lm(formula = TySalesUnit ~ TyMarkdown + TyAvgStockUnit) Coefficients: t value Pr(>|t|) ...

    Started by masarimk‎, 03-12-2012 06:46 AM
    • Replies: 0
    • Views: 1,035
    03-12-2012, 06:46 AM Go to last post
  34. The standardized and non standardized coefficients gives diff results

    Hi. Some coworkers ran a regression and used first the beta to analyze the strength of the independent variables in a regression. However all the...

    Started by Kframnes‎, 03-09-2012 04:28 PM
    • Replies: 7
    • Views: 4,102
    03-09-2012, 05:21 PM Go to last post
  35. Binomial regression with x as the dependent variable and n as an independent variable

    Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

    Started by emily.stats‎, 03-05-2012 04:24 PM
    2 Pages
    1 2
    binomial, challenge
    • Replies: 15
    • Views: 2,861
    03-08-2012, 05:59 PM Go to last post
  36. warning at logistic reg.

    Hello, I am trying to do logistic regression analysis. The problem I face is that this warning comes out in my output : Due to redundancies,...

    Started by elpaki‎, 03-08-2012 06:51 AM
    • Replies: 0
    • Views: 1,637
    03-08-2012, 06:51 AM Go to last post
  37. Binary DV and orthogonal contrasts

    HEEEEEEEEELLLLPPPPPP!!!!! The data I am trying to analyse has a binary dependent variable (1=yes, 0=no) and tow factors. Factor 1 is a treatment...

    Started by matteovisentin‎, 03-08-2012 04:53 AM
    binary data, categorical data, contrasts, genlin
    • Replies: 0
    • Views: 1,138
    03-08-2012, 04:53 AM Go to last post
  38. Unhappy Single parent-offspring regression

    Does anyone know how to do this? I can't find the web page I found with the full explanation:shakehead Failing that, I am carrying out a study...

    Started by charlotte22‎, 03-08-2012 03:03 AM
    • Replies: 0
    • Views: 1,973
    03-08-2012, 03:03 AM Go to last post
  39. Categorical variables - Logistic regression

    Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

    Started by nikhil_s‎, 03-07-2012 10:38 AM
    binning, categorical data analysis, categorical vairable, logistic regression
    • Replies: 5
    • Views: 2,752
    03-07-2012, 02:06 PM Go to last post
  40. Moderation, GLM, and interactions. Discrepent results...

    Hello all, I'm running a GLM to test for moderation. One of my interaction terms (the product of two continuous variables) looks suspicious......

    Started by cellardoor.‎, 03-06-2012 07:04 PM
    • Replies: 0
    • Views: 1,437
    03-06-2012, 07:04 PM Go to last post
  41. Interaction terms between correlated predictors

    Hello, I'm trying to test how the amount of native forest in a landscape affects the number of bird species, and how this relationship varies with...

    Started by souffle‎, 03-01-2012 09:55 PM
    • Replies: 2
    • Views: 1,819
    03-06-2012, 06:12 PM Go to last post
  42. Need help understanding an equality associated with regression analysis

    Hi everyone, I am attempting to understand the implications the equality listed below has in regards to regression models. The equality is...

    Started by phightins530‎, 03-06-2012 02:13 PM
    • Replies: 4
    • Views: 1,201
    03-06-2012, 04:20 PM Go to last post
  43. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 19,330
    03-06-2012, 11:39 AM Go to last post
  44. Does fitting of a regression line as such contribute to mass significance?

    Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

    Started by Bassler‎, 03-06-2012 05:04 AM
    false positives, fitting a line, least squares, mass significance, regression line
    • Replies: 0
    • Views: 891
    03-06-2012, 05:04 AM Go to last post
  45. Semi-saturated Fixed Effects

    Today my supervisor instructed me to try to use semi-saturated Fixed Effects analysis. I have tried searching for "semi-saturated" and "saturated"...

    Started by Laco‎, 03-01-2012 01:07 PM
    • Replies: 4
    • Views: 1,841
    03-04-2012, 01:15 PM Go to last post
  46. Urgent Help required: How to calculate linear predictor x in this table?

    Dear All, Please help

    Started by graced‎, 03-03-2012 07:56 AM
    • Replies: 5
    • Views: 1,424
    03-04-2012, 12:32 AM Go to last post
  47. Logistic Regression

    Hi, I am using R. For example, Y=β0 + β1X1+ β2X2 = log (a/(1-a)) where a = probability >g1<-glm(Count~X1+X2,family="binomial")...

    Started by paxy‎, 02-29-2012 02:40 AM
    • Replies: 1
    • Views: 904
    03-02-2012, 04:39 PM Go to last post
  48. Fixed Effects and interaction terms

    I am trying to analyze sex difference in housework time using longitudinal data with Fixed Effects. Since, sex is time-invariant I can not...

    Started by Laco‎, 03-01-2012 05:33 PM
    • Replies: 2
    • Views: 5,917
    03-01-2012, 06:01 PM Go to last post
  49. log linear model for dependence

    Hi I fitted a log linear model (proc genmod dist=negative binomial link=log) to see any dependence/association between 3 categorical variables. I...

    Started by szm‎, 02-29-2012 10:31 AM
    count, dependence, log linear, poisson regression
    • Replies: 2
    • Views: 1,270
    02-29-2012, 02:53 PM Go to last post
  50. Regression table interpretation problem

    Hello all, I am a complete beginner in statistics but I have come across a table I need to interpret for my research. Although it's probably a...

    Started by Nebounette‎, 02-28-2012 04:54 PM
    • Replies: 8
    • Views: 2,493
    02-29-2012, 09:58 AM Go to last post
  51. Cool Sequential Logit Model (Hurricane Evacuations)


    Started by tenki‎, 02-28-2012 02:10 PM
    • Replies: 0
    • Views: 862
    02-28-2012, 02:10 PM Go to last post
  52. Angry Multiple regression, removing very small coefficients

    Hello, I did 'backwards method' multiple regression in SPSS to predict 'energy'. The R^2 value is 0.951. Here is the final output model of the...

    Started by bradyj2‎, 02-28-2012 08:43 AM
    • Replies: 1
    • Views: 2,223
    02-28-2012, 11:42 AM Go to last post
  53. Regression Help! to predict performance using the output of questionaire

    Hi All, Somebody pl. helpe me in the brlow case, As a part of academic project, im intrested in measuring performance of purchase dpeartment in a...

    Started by Arjun‎, 02-22-2012 05:08 AM
    multiple regression, regression analysis
    • Replies: 13
    • Views: 1,948
    02-28-2012, 01:12 AM Go to last post
  54. Articles/information on robust regression?

    Hi, I am a little confused as to what methods there are for "robust" regression. I thought it was an actual type (as in logistic, linear, etc),...

    Started by statn00b‎, 02-23-2012 09:05 AM
    • Replies: 5
    • Views: 1,551
    02-26-2012, 07:32 PM Go to last post
  55. how many time dummies in pooled regression?

    Hi guys, I want to perform a cross sectional time series regression - fixed effects model. Am I correct that it is better to group time by time...

    Started by SylviaS‎, 02-23-2012 08:44 AM
    • Replies: 2
    • Views: 2,738
    02-26-2012, 06:43 PM Go to last post
  56. Is this an instance of simultaneity? Can you help me understand why?

    I cant seem to figure this out, as standard descriptions of simultaneity in econometrics textbooks don't quite seem to fit. 1. I have panel data...

    Started by andrewcd‎, 02-24-2012 10:45 PM
    • Replies: 0
    • Views: 1,058
    02-24-2012, 10:45 PM Go to last post
  57. multivariate logistic regression

    Hello, I need to perform multivariate logistic regression on 3 binary variables. My independent variables are also categorical (3-10 levels)...

    Started by szm‎, 02-23-2012 07:38 PM
    logistic regression, multivariate, multivariate logistic reg, sas
    • Replies: 1
    • Views: 1,621
    02-24-2012, 10:09 AM Go to last post
  58. Stats Help Regression

    Hi, Do you know what kind of regression tests I should run for this and how to run them? Thanks for your help. Attached is the file.

    Started by baller99‎, 02-23-2012 04:40 PM
    • Replies: 4
    • Views: 1,124
    02-23-2012, 06:36 PM Go to last post
  59. Regression of Conditional Expectations E[Y|X,Z=z] = f(E[X|Z=z])

    Hello all, I have a regression problem I'm interested in that seem like it should be a fairly common and well understood, but due to my weak...

    Started by NITHOS‎, 02-23-2012 01:12 PM
    • Replies: 0
    • Views: 1,004
    02-23-2012, 01:12 PM Go to last post
  60. Regression on Composite Rates

    I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

    Started by BrandonB‎, 02-22-2012 06:26 PM
    • Replies: 0
    • Views: 1,358
    02-22-2012, 06:26 PM Go to last post

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