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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Confusing results after introduction of an interaction effect

    Found answers to my question. You can delete this topic.

    Started by Mruvka‎, 10-06-2013 11:24 PM
    • Replies: 0
    • Views: 1,169
    10-06-2013, 11:24 PM Go to last post
  2. What are the implications if variance changes with x

    I am told that Var(U_i |X) =(sigma)^2(x_i)^2 and that the covariance between all the unobservables is equal to sigma squared If I'm looking...

    Started by kingsolomonsgrave‎, 10-02-2013 05:09 PM
    • Replies: 7
    • Views: 1,750
    10-03-2013, 08:05 PM Go to last post
  3. Sample size sensitivity in time series regression analysis

    I have a time series that I've built a regression on, say Y = X + Y. For a data set of size 300, the coefficients of X and Y are statistically...

    Started by tomasic‎, 10-03-2013 10:50 AM
    conditional probability, regression, sample size calculation, time series analysis
    • Replies: 2
    • Views: 1,804
    10-03-2013, 07:34 PM Go to last post
  4. All my coefficients are statistically significant

    Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

    Started by royalstatus‎, 09-23-2013 05:24 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 5,660
    10-03-2013, 06:21 PM Go to last post
  5. Factor analysis vs logistic regression

    Factor analysis and logistic regression are methods which i have never used before. I really did not need to use them, well until now. My knowledge...

    Started by badibad‎, 10-02-2013 12:53 PM
    • Replies: 2
    • Views: 3,714
    10-03-2013, 02:24 PM Go to last post
  6. Independent variable not Really Independent?

    Please forgive my ignorance in advance. I have "dependent variables"- the price paid for a business as a multiple of revenues (e.g. the business...

    Started by statchallenged‎, 10-03-2013 10:07 AM
    • Replies: 3
    • Views: 1,928
    10-03-2013, 01:21 PM Go to last post
  7. Regression analysis guy wannabe

    I'm a math guy that's been out of school for 20 years in a non-math career. I'm interested in learning regression analysis, and I'd like to know how...

    Started by attemi‎, 09-30-2013 10:44 AM
    • Replies: 10
    • Views: 2,003
    10-03-2013, 12:11 PM Go to last post
  8. standardized residuals

    hi is it possible to do (standardized residuals) in SPSS for detecting outliers more than one time.

    Started by Ali Ali‎, 10-03-2013 12:01 AM
    • Replies: 3
    • Views: 1,921
    10-03-2013, 10:33 AM Go to last post
  9. Likelihood function for multiple linear regression with a covariate

    Hello, I'm trying to adapt a script that was written in SAS into R, and I've run into a problem that isn't so much related to the different...

    Started by Magnetawan‎, 10-02-2013 08:12 AM
    linear regression; mle
    • Replies: 3
    • Views: 1,497
    10-02-2013, 12:10 PM Go to last post
  10. Linear Regression and Box-Cox transformation

    Hi, I have a model which predicts the number of defects in a class which takes into account few standard independent variables like CK metrics....

    Started by Akhila‎, 10-02-2013 08:46 AM
    • Replies: 0
    • Views: 1,826
    10-02-2013, 08:46 AM Go to last post
  11. Logistic Regression - order of inclusion

    Hi I'm working on a logistic regression using R. My outcome is Survived/Died and I have 16 predictors consisting of numerical and categorical...

    Started by scotchpie‎, 10-01-2013 06:03 AM
    • Replies: 2
    • Views: 2,011
    10-02-2013, 01:49 AM Go to last post
  12. OLS question

    I'm asked to write the OLS criterion function for the model P = mu +Ui Pi = price of the ith item in question, mu = population average and Ui...

    Started by kingsolomonsgrave‎, 09-30-2013 06:09 PM
    • Replies: 3
    • Views: 2,111
    10-02-2013, 01:19 AM Go to last post
  13. how to estimate B1 by OLS

    I am asked to 'estimate B1 by OLS' and told that the variance of u wrt x is a constant (sigma^2) times Xi^2 and that the covariances between all the...

    Started by kingsolomonsgrave‎, 10-01-2013 01:22 PM
    • Replies: 0
    • Views: 2,677
    10-01-2013, 01:22 PM Go to last post
  14. What econometric method for macroeconomic trade data?

    Hello, I am working with a data set with trade data of one specific good of 173 countries from 1990 to 2010 in STATA. For every year and a pair of...

    Started by DanielFox‎, 09-30-2013 04:10 PM
    • Replies: 3
    • Views: 2,986
    10-01-2013, 08:57 AM Go to last post
  15. Urgent regression analysis

    Guys i have an assesment for tommorow, and i have to make an analysis, simple but hard since i didnt really pay attention in class.... I have been...

    Started by kozanostraa‎, 09-30-2013 08:50 PM
    • Replies: 5
    • Views: 1,941
    10-01-2013, 03:06 AM Go to last post
  16. Classification with high positive predictive value

    I have a two-class classification problem. I would like to train a multivariate classifier with 100% positive predictive value. In other words, I...

    Started by dchalmer‎, 09-17-2013 09:52 AM
    classification, predictive model, predictive value
    • Replies: 3
    • Views: 1,909
    09-30-2013, 11:51 AM Go to last post
  17. Lightbulb Log-Normal vs. Student t-distributed Errors - exponential, logarithmic transformation

    Hello All, I'm supporting a client who is attempting to fit a line to a set of 5 (X,Y) data points. Call X years and Y people. I understand the...

    Started by sbanders‎, 09-30-2013 09:23 AM
    error terms, linear regression, lognormal, prediction interval
    • Replies: 0
    • Views: 2,050
    09-30-2013, 09:23 AM Go to last post
  18. My nemesis: multinomial logistic regression

    Dear all, For the final article of my PhD-thesis, I need to analyze various categorical results. My goal is to find whether a certain genotype...

    Started by ecverbeek‎, 09-30-2013 04:23 AM
    categorical data analysis, genetic, multinomial regression
    • Replies: 1
    • Views: 1,522
    09-30-2013, 08:30 AM Go to last post
  19. SPSS - Logistic Regression - Continuous independent and moderating variables

    Hi, I'm trying to analyse the relation between 4 independent variables and 1 dependant variable (yes=1, no=0), using Logistic Regression, in SPSS....

    Started by MarisaFernandes‎, 08-19-2013 06:42 PM
    logistic regression, spss
    • Replies: 6
    • Views: 2,864
    09-29-2013, 11:46 PM Go to last post
  20. Time Series Question:Garch to forecast price/return?

    Is it possible to use Garch to model price or return?or does Garch only model the volatility of price/return? Thanks

    Started by ankc‎, 09-29-2013 02:20 PM
    • Replies: 0
    • Views: 1,603
    09-29-2013, 02:20 PM Go to last post
  21. Proof of Variance(b1)

    So I guess this is simple regression through the origin. I'm not sure if I'm doing this wrong or what to do next in the proof. I skipped a few steps...

    Started by TheRealAct‎, 09-28-2013 04:23 PM
    • Replies: 14
    • Views: 8,732
    09-29-2013, 10:45 AM Go to last post
  22. Multiple Regression Help

    Hello, I need help/advice with multiple regression analysis. I am looking at the degree of discrimination towards women in construction...

    Started by tayvuihan‎, 09-28-2013 10:24 PM
    analysis, multiple regression, regression, statistic, test
    • Replies: 0
    • Views: 1,658
    09-28-2013, 10:24 PM Go to last post
  23. Fitting of a linea mixed model

    Hello I'm trying to modelize the diving depth of birds according to categorical (sex, age class: adults/subadults) and conitnuous parameters...

    Started by Alex939‎, 09-26-2013 05:00 PM
    • Replies: 8
    • Views: 2,155
    09-27-2013, 08:36 AM Go to last post
  24. Panel Data Regression

    Hi all, I was wondering if I could get some advice on the research I'm attempting to carry out which involves the following data for 30 countries...

    Started by TLanson‎, 09-27-2013 12:27 AM
    • Replies: 1
    • Views: 1,440
    09-27-2013, 08:11 AM Go to last post
  25. the sign of correlation and regression coefficients

    Hello I have 9 predictor variables that all of them are positively correlated to the dependent variable. But for running a regression analysis I...

    Started by Bahareh‎, 09-21-2013 02:45 PM
    • Replies: 2
    • Views: 1,990
    09-26-2013, 03:52 AM Go to last post
  26. percentages

    I am having trouble figuring out what analysis to use for my research. I am investigating the social factors (gender, age, education level, etc.)...

    Started by jpeake318‎, 09-25-2013 12:45 PM
    • Replies: 0
    • Views: 1,370
    09-25-2013, 12:45 PM Go to last post
  27. Does anybody know if the Oaxaca Blinder decomposition command is now available SPSS?

    Hi, I was wondering if it was now possible to run the Oaxaca Blinder decomposition on SPSS? I know it is possible on Stata but I do not wish to...

    Started by Dubuclawrence‎, 09-23-2013 05:42 PM
    oaxaca blinder, regression analysis, spss
    • Replies: 0
    • Views: 2,583
    09-23-2013, 05:42 PM Go to last post
  28. Obtain the least squares estimator b1 of B1.

    Given the regression model Yi=B1Xi + ei for i=1,2,...,n. Is the estimator unbiased? So this represents the simple model with B0=0, but I'm not...

    Started by TheRealAct‎, 09-22-2013 12:09 AM
    • Replies: 6
    • Views: 3,293
    09-23-2013, 04:32 AM Go to last post
  29. Comparing coefficients on two same DV same IV models

    I'm running regressions on two models using the same (8) independent and dependent variables. The dependent variable in the two models spans two...

    Started by robin772‎, 09-18-2013 10:54 AM
    • Replies: 3
    • Views: 3,101
    09-19-2013, 09:58 AM Go to last post
  30. Adjusting for gender in total brain volume

    Is there a way to adjust for the effect of gender on the outcome measure - brain volume without using it as just a co-variate. i.e. can I transform...

    Started by deeo‎, 09-18-2013 05:45 PM
    • Replies: 0
    • Views: 1,919
    09-18-2013, 05:45 PM Go to last post
  31. Constructing Prediction Intervals for Forecasted Values in a Time Series

    I have a time series with 231 data points and the following descriptive statistics: Mean 75,231.66 Standard Error 969.98 Median 70,728.00 ...

    Started by David Lahar‎, 09-16-2013 03:16 PM
    • Replies: 3
    • Views: 5,580
    09-18-2013, 09:14 AM Go to last post
  32. How exactly does MLR hold other things constant?

    Hi all, I have just signed up to the forum and I am quite inspired by the discussions. I have an intermediate level experience in statistics...

    Started by ChiSquare‎, 09-17-2013 02:32 AM
    • Replies: 2
    • Views: 3,008
    09-17-2013, 09:46 AM Go to last post
  33. Combined or separate regressions?

    Dear forumites, I have a (I guess) pretty basic question concerning multiple linear regression. My situation is the following: I have a...

    Started by dgi‎, 09-09-2013 09:35 AM
    • Replies: 2
    • Views: 1,796
    09-16-2013, 10:33 AM Go to last post
  34. Sum of the squared least squared residual

    Hey guys! This is my first post on this booming forum! I came across a problem that asks "Find the Sum of the squared least squared residual"...

    Started by brothers10‎, 09-16-2013 09:50 AM
    least squares, regression models, residual, stats
    • Replies: 0
    • Views: 1,430
    09-16-2013, 09:50 AM Go to last post
  35. multiple imputation and nested/hierarchical regression

    Can anyone enlighten me as to how I can conduct a nested/sequential/hierarchical regression using multiply imputed datasets in R or Stata? In Stata,...

    Started by vtmft‎, 09-15-2013 04:12 PM
    hierarchical regression, multiple imputation, r software, stata
    • Replies: 0
    • Views: 1,577
    09-15-2013, 04:12 PM Go to last post
  36. Representing a MLR equation on its matrix form

    Hi everyone, So my teacher was showing us how to find the B coeficients of a Multiple Linear Regression equation (Bo+B1x1+Bnxn) using matrixes and...

    Started by sanur13‎, 09-15-2013 01:32 PM
    • Replies: 2
    • Views: 1,823
    09-15-2013, 03:27 PM Go to last post
  37. Reading Binary Logistic Regression results

    Hi! Need some help on Binary Logistic Regression results interpretation. 1) On Block 0: Begining Block i have overall percentage of 76%, but...

    Started by MarisaFernandes‎, 09-12-2013 06:43 PM
    logistic regression, results
    • Replies: 4
    • Views: 3,360
    09-13-2013, 08:10 PM Go to last post
  38. LS, BLUE and ML Comparison

    Hi, I have two questions on my study guide for econometrics that I have trouble answering and was wondering whether someone could help me out...

    Started by Spassapparat‎, 09-13-2013 10:17 AM
    • Replies: 3
    • Views: 1,542
    09-13-2013, 04:48 PM Go to last post
  39. Understanding Dynamic Panel Data Models - Arellano-Bond and the like

    Hey, the more I'm reading about models to analyse panel data, the more confused I end up. Right now, I'm at a point where I don't know anymore...

    Started by TheOneAndOldi‎, 09-13-2013 04:35 PM
    • Replies: 0
    • Views: 2,589
    09-13-2013, 04:35 PM Go to last post
  40. random factor levels with highly varying numbers of data points

    Hi! I am doing a fairly straightforward analysis where we have a dependent variable which we try to measure many times under different conditions...

    Started by amorphia‎, 09-13-2013 02:23 PM
    • Replies: 0
    • Views: 1,360
    09-13-2013, 02:23 PM Go to last post
  41. Transformed dependent variable

    Hi, Apologies if this is simple, my background isn't in statistics. I am using geographically weighted poisson regression to explore relationships...

    Started by lau86‎, 09-13-2013 11:36 AM
    • Replies: 0
    • Views: 1,382
    09-13-2013, 11:36 AM Go to last post
  42. Ordered logit with likert type independent variables

    Hello I am estimating a model where the dependent variable takes three possible values (1,2,3 ), which also have the respective meaning, i.e. 3...

    Started by gabrielle‎, 09-12-2013 10:25 PM
    • Replies: 0
    • Views: 2,386
    09-12-2013, 10:25 PM Go to last post
  43. regression query

    Hi All Id appreciate any help on this query. I'm new to stats so please bear with me. I need to calculate voc emissions from car care...

    Started by barste‎, 09-12-2013 09:06 AM
    • Replies: 2
    • Views: 2,118
    09-12-2013, 11:09 AM Go to last post
  44. Plot interaction effects

    Hi! I already know how to plot the predicted probabilities of binomial models without any interaction terms: predicted logit = a + bX ...

    Started by FDFS‎, 09-12-2013 10:06 AM
    binomial logistic regress, interactions, predicted probabilities
    • Replies: 6
    • Views: 7,580
    09-12-2013, 10:23 AM Go to last post
  45. How to Organize Years in SPSS for Linear Regression

    Hello, IV: Time DV: Number of Alcohol References in Music Hypothesis: Alcohol references in country music will increase significantly over the...

    Started by sprices‎, 09-10-2013 04:16 PM
    • Replies: 0
    • Views: 5,428
    09-10-2013, 04:16 PM Go to last post
  46. Beta of 0 and p-value of 1

    Hello, I am estimating a 2 stages least squares model. My first stage is fine ( strong instrument) but my second stage gives my coŽfficiŽnt in...

    Started by carmen256‎, 09-10-2013 06:22 AM
    beta 0; p-value 1
    • Replies: 3
    • Views: 2,818
    09-10-2013, 02:08 PM Go to last post
  47. Lightbulb Repeated Measures ANOVA (Split-Plot ANOVA) analysis of residuals

    Hi, how to process decent residual analysis in repeated measures? I know that the residuals should have normal distribution (altogether an in...

    Started by Martin Marko‎, 09-09-2013 12:33 PM
    anova, model checking, repeated measures, residual analysis, residuals
    • Replies: 5
    • Views: 3,932
    09-10-2013, 07:02 AM Go to last post
  48. R square change and different dependent variables?

    Is the R square change statistic that is used to compute significances of differences between blocks/steps of a sequential/hierarchical regression...

    Started by vtmft‎, 09-09-2013 07:42 PM
    • Replies: 1
    • Views: 2,442
    09-09-2013, 08:11 PM Go to last post
  49. How to deal with collinearity?

    I am wondering what methods everyone uses to deal with collinearity. I recently came across this article http://bit.ly/14wDcgH But it doesn't really...

    Started by stats4cool‎, 09-08-2013 03:40 PM
    • Replies: 5
    • Views: 4,876
    09-09-2013, 03:14 PM Go to last post
  50. Assessing the relationship between a continuous variable and categorical variables

    Hello! I have a problem for which I have trouble finding a solution. I would like to assess the relationship between a continuous dependent...

    Started by CheersToStata‎, 09-09-2013 11:32 AM
    • Replies: 2
    • Views: 2,924
    09-09-2013, 12:20 PM Go to last post
  51. Multiple Regression with Discrete and Continuous data in Excel

    Hi, I've got lots of rows of data in Excel (around 3,500), and multiple variables. 1 of my variables is continuous (company revenues) 1 of my...

    Started by anikamashru‎, 09-09-2013 09:19 AM
    discrete, excel, multiple, regression, variables
    • Replies: 0
    • Views: 2,584
    09-09-2013, 09:19 AM Go to last post
  52. MSE calculation question

    On a homework assignment I was recently given I have the following data points for calculating a regression line -- Y values: 2,2,1,1,3,4,5,5,7,6...

    Started by jareep‎, 09-08-2013 11:16 PM
    • Replies: 0
    • Views: 1,628
    09-08-2013, 11:16 PM Go to last post
  53. Clusters in regression

    Hi, I'm using SAS for regression analysis. I have a series of observations of temperatures. I've two tempratures - one in country X and one in...

    Started by ofir‎, 09-07-2013 08:32 AM
    • Replies: 4
    • Views: 2,728
    09-08-2013, 11:23 AM Go to last post
  54. Monte Carlo Simulations for Evaluating the Performance of Regression Parameter Estima

    Hi, You could tell me the reason(s) for the following: Let S1 = the average of the standard errors of parameter estimates from M simulations; ...

    Started by tonychen‎, 09-07-2013 09:24 AM
    • Replies: 0
    • Views: 1,441
    09-07-2013, 09:24 AM Go to last post
  55. SPSS- Binary Logisitc Regression- what to do when there are few significant variables

    Hi, I am looking at the factors associated with successful smoking cessation. I have two groups (smokers and ex-smokers) so I am using binary...

    Started by caoimhe‎, 09-07-2013 07:48 AM
    • Replies: 0
    • Views: 1,378
    09-07-2013, 07:48 AM Go to last post
  56. R-square for linear mixed models

    What is the best way to calculate the R-square of a linear mixed model? May first guess would be to correlate the predicted values with the...

    Started by Wilbert‎, 09-03-2013 04:48 AM
    • Replies: 2
    • Views: 2,160
    09-07-2013, 05:39 AM Go to last post
  57. Variance components mixed models trouble

    Hello, I am using mixed models for variance components analysis and have encountered some problems with non-constant variance and...

    Started by stweb‎, 09-07-2013 05:14 AM
    components, generalised, mixed model, variance
    • Replies: 0
    • Views: 1,819
    09-07-2013, 05:14 AM Go to last post
  58. Need help with regression analysis

    Hi everyone, I am kinda confused with regression analysis. My research is to investigate the degree and trend women in the construction industry...

    Started by tayvuihan‎, 09-06-2013 07:01 AM
    advise, analyse, problem, regression, statistic
    • Replies: 4
    • Views: 1,697
    09-06-2013, 10:13 AM Go to last post
  59. LH ratio significant but covariates not?

    I have performed Cox regression analysis using Forward LR method. As a results two covariates are included in the final model. First one has two...

    Started by arkiaamu‎, 09-03-2013 01:45 PM
    • Replies: 5
    • Views: 1,765
    09-06-2013, 10:06 AM Go to last post
  60. Probing an Interaction b/w 3-level categ. predictor and continuous predictor

    Hello! I'm a bit stuck and have scoured the internet for help but to no avail. Any guidance would be much appreciated ... From my omnibus...

    Started by Nick00004‎, 09-05-2013 08:10 PM
    • Replies: 0
    • Views: 1,699
    09-05-2013, 08:10 PM Go to last post

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