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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Theoretical question from Mixed Effects Random Coefficents Multilevel Linear Models

    hello people! this is kind of a theoretical question from people who've seen mixed-effects/random-coefficients/multi-level models before or have a...

    Started by spunky‎, 11-01-2011 02:15 PM
    • Replies: 6
    • Views: 2,834
    11-03-2011, 12:46 AM Go to last post
  2. Model evaluation in logistic regression

    I am doing the analysis in very recent forms of SAS (if any use that here). I ran a logistic model with a huge number of data points (some 11,000)....

    Started by noetsi‎, 11-01-2011 06:41 PM
    • Replies: 6
    • Views: 6,331
    12-02-2011, 04:14 PM Go to last post
  3. Help to control on the size effect between two groups (small vz. big)

    Hello All, I would like to have your help to solve the size effect. Specifically, I have two group of companies listed on different markets....

    Started by Stata_user‎, 11-11-2011 11:30 AM
    • Replies: 6
    • Views: 2,883
    11-12-2011, 12:44 PM Go to last post
  4. Can I trust a regression if variables are autocorrelated?

    Hello everyone! Both variables (dependent and independent) show autocorrelation effects. When I run regression and estimate the residuals, they...

    Started by Mistermishka‎, 12-03-2011 01:48 PM
    autocorrelation, regression analysis, t-statistic
    • Replies: 6
    • Views: 2,752
    12-04-2011, 10:59 AM Go to last post
  5. two ANOVAs, which to use?

    Hypothetical: you have ANOVA tables from two regressions. One is regressed on more variables than the other. The one with more variables, has a low...

    Started by el_presidente_psych‎, 12-12-2011 10:16 AM
    • Replies: 6
    • Views: 2,525
    12-13-2011, 10:12 AM Go to last post
  6. P-value in regression analysis

    How much should a p-value in a regression model be for the related variable to be considered insignificant?

    Started by X-Offender‎, 12-15-2011 10:04 AM
    • Replies: 6
    • Views: 13,604
    12-25-2011, 02:33 PM Go to last post
  7. interpreting log transformed co-effients in linear regression?

    Hello, I have 1 continuous dependent and 1 predictor variable that I've logarithmically transformed to normalise the data and their residuals for...

    Started by orangecrush‎, 12-30-2011 10:52 AM
    • Replies: 6
    • Views: 3,746
    12-31-2011, 12:03 PM Go to last post
  8. Fitting a model with Bernoulli/Binomially distributed data

    I am used to fitting data to estimate parameters in a model f(x,A) where x is my data point and A is the parameter(s) to be determined. To achieve...

    Started by sparticle10‎, 01-07-2012 08:36 PM
    bernoulli, maximum likehood, regresion
    • Replies: 6
    • Views: 2,707
    01-08-2012, 02:44 PM Go to last post
  9. Collinearity Among Categorical Variables in Regression

    Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

    Started by jastingo‎, 01-21-2012 05:40 PM
    • Replies: 6
    • Views: 34,848
    01-25-2012, 03:52 PM Go to last post
  10. Use of regression models with centered variables

    Hi all, I'm a little confused about how to use a regression model with centered variables. I know how centering variables works for reducing...

    Started by Ytrack‎, 01-30-2012 10:37 PM
    centering variables, interaction terms, regression
    • Replies: 6
    • Views: 9,244
    02-01-2012, 12:23 AM Go to last post
  11. Building a Logisics regression model - help

    Audited ~50 patients, and collected 10 potential predictors for each (some quantitative, some indicative, all independent). Trying to develop a...

    Started by j_cocker‎, 02-09-2012 05:49 AM
    • Replies: 6
    • Views: 2,233
    02-09-2012, 06:03 PM Go to last post
  12. Linear Regression mystery

    A linear model was built, using 2 explanatory variables and 30 observations. the results were: B=(3.57, -0.18, 1.259)^t (the coefficients) ...

    Started by Yankel‎, 02-12-2012 07:44 AM
    • Replies: 6
    • Views: 2,469
    02-12-2012, 02:11 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: 2,031
    03-21-2012, 12:28 PM Go to last post
  14. Multiple Regression theory

    Hey guys I'm not too good with the logic of multiple regression so I'd like some enlightenment on the following query. I'm running a multiple...

    Started by durantz‎, 04-03-2012 12:11 AM
    • Replies: 6
    • Views: 2,746
    04-19-2012, 05:19 AM Go to last post
  15. Alternatives to Poisson regression for overdispersed count data

    Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

    Started by forscher‎, 05-04-2012 11:20 AM
    count data, poisson mean/variance, poisson regression
    • Replies: 6
    • Views: 2,401
    05-04-2012, 11:52 AM Go to last post
  16. Help - coefficients have wrong signs!

    Hi guys I'm a struggling with an econometric model. I am trying to predict tenant demand for office space based on a selection of 5 lagged...

    Started by Pete‎, 05-13-2012 11:21 PM
    • Replies: 6
    • Views: 2,145
    05-17-2012, 10:36 AM Go to last post
  17. LME in SPSS and R giving different results

    I am trying to do a linear mixed model in both SPSS and R ... well, more precisely, originally I did it in SPSS, but now I want to use resampling to...

    Started by baixiwei‎, 06-08-2012 09:21 PM
    • Replies: 6
    • Views: 5,382
    06-11-2012, 04:31 PM Go to last post
  18. Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

    Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

    Started by bekkiee‎, 06-27-2012 05:09 PM
    • Replies: 6
    • Views: 4,912
    06-28-2012, 09:18 AM Go to last post
  19. Sample size of Categorical Variables

    Hi, I'm running a binary logistic model that includes categorical variables. One of my main covariates has 8 categories and some of the sample...

    Started by li_mee‎, 07-09-2012 10:21 AM
    categorical variable, dummy variables, logistic regression, sample
    • Replies: 6
    • Views: 8,014
    07-23-2012, 08:17 AM Go to last post
  20. (OLS) How to get sample variance-covariance matrix of residuals?

    Consider the OLS: (1) y = a + b*x + e Where e is the error term. I understand that the population variance-covariance matrix for the residuals...

    Started by derksheng‎, 07-16-2012 07:00 AM
    • Replies: 6
    • Views: 4,967
    07-16-2012, 10:02 AM Go to last post
  21. reporting descriptive Stats when using gender in multiple regression.

    Hi, I am relatively new to research methods and using SPSS. I wanted to perform multiple regression analysis using categorical and continuous...

    Started by caoimhe‎, 07-18-2012 05:50 PM
    • Replies: 6
    • Views: 4,360
    07-19-2012, 02:39 PM Go to last post
  22. Moderated multiple regression - comparing interactions with dummy variables

    Hello - I ran a moderated multiple regression in SPSS and am having a hard time understanding the results with my dummy codes. IV - rejection...

    Started by Susanmarkunas‎, 07-19-2012 02:29 PM
    • Replies: 6
    • Views: 3,001
    08-02-2012, 12:33 PM Go to last post
  23. Newbie Logistic regression/weighted regression

    Greetings I have been reading this article http://vassarstats.net/logreg1.html and trying to understand it but I am getting confused at how they...

    Started by aivoryuk‎, 07-26-2012 03:19 PM
    • Replies: 6
    • Views: 2,370
    07-31-2012, 05:03 PM Go to last post
  24. \hat{SE}(coefficient) OR SE(\hat{coefficient})?

    Hi all, Typesetting a table at the moment and would like to know which is correct for the standard error, given the population model Y_t = a + b...

    Started by derksheng‎, 08-10-2012 09:08 AM
    • Replies: 6
    • Views: 2,577
    08-10-2012, 01:53 PM Go to last post
  25. Dependent variable issues: (i) Mild skewness and (i) Measurement error

    Cross-sectional \hat{Y}_i = a + b X_i + e_i over i \in \{1,2,...,300\}. \hat{Y}_i's were estimated in a different regression (specifically, 300...

    Started by derksheng‎, 08-16-2012 07:12 AM
    • Replies: 6
    • Views: 1,771
    08-17-2012, 10:08 AM Go to last post
  26. The claim of homoscedasticity when presenting an OLS specification

    From http://web.mit.edu/~kjforbes/www/Papers/AsianFluandRussianVirus-JIE.pdf applied econometrics paper: Why does the author claim...

    Started by derksheng‎, 08-22-2012 09:52 PM
    • Replies: 6
    • Views: 2,524
    08-22-2012, 10:12 PM Go to last post
  27. Urgent Some Reasons why variables are insignificant

    Hi guys *its urgent plz* i just wanted to know some good reasons of "why my some of the variables are insignificant in regression, As...

    Started by lamhay101‎, 09-08-2012 03:33 PM
    • Replies: 6
    • Views: 3,088
    09-10-2012, 12:39 AM Go to last post
  28. Multiple Regression Analysis Issue

    Hi everyone I have just signed up! I am currently doing a thesis & struggling with my regression model. I am examining the link between profit...

    Started by 1114368@rgu.ac.uk‎, 09-10-2012 04:09 PM
    dummy variable, help needed, hypothesis testing, multiple regression, problem
    • Replies: 6
    • Views: 2,788
    09-17-2012, 12:54 AM Go to last post
  29. binary logistics for suicide ideation and attempt

    Hi, I am doing analysis for relatively large sample of high school students (4000) of predicting lifetime usage of psychoactive substances as...

    Started by aliriza.arenliu‎, 09-10-2012 07:48 AM
    • Replies: 6
    • Views: 1,861
    09-12-2012, 05:38 PM Go to last post
  30. Multicollinearity and the 'backward' regression method

    Hello, Simple question - Am I right is assuming that you cannot use backwards,forwards or best subsets regression techniques if you have two...

    Started by bradyj2‎, 09-26-2012 09:56 AM
    • Replies: 6
    • Views: 2,776
    09-26-2012, 12:22 PM Go to last post
  31. Help! can't get normal residual, what should I do?

    Dear All, I am working on a project, and trying to explain what factors will affect the price of a product, here LOG10(PRICE) is the DV, and a few...

    Started by fcong‎, 10-05-2012 03:54 AM
    • Replies: 6
    • Views: 2,659
    10-09-2012, 12:56 AM Go to last post
  32. Projecting Data - what is the right analysis to use?

    I am in healthcare. I have a report have is providing me a unit of service on a daily basis going back three months. What I would like to do is...

    Started by psrs0810‎, 10-15-2012 08:05 AM
    • Replies: 6
    • Views: 1,829
    10-16-2012, 02:11 PM Go to last post
  33. Still a count variable?

    First off, I hope this is the right forum. I'm not sure which other one would be more appropriate for the question. I have a dependent variable...

    Started by crimsonandclover‎, 12-10-2012 05:15 AM
    • Replies: 6
    • Views: 2,065
    12-11-2012, 07:22 AM Go to last post
  34. Hierarchical Regression for Undergraduate Thesis

    Hi, I am working on an undergraduate thesis testing the effectiveness of incentives in the workplace. My director told me that I had to run a...

    Started by Catalyst48‎, 04-01-2013 07:18 PM
    • Replies: 6
    • Views: 3,378
    04-08-2013, 04:53 PM Go to last post
  35. Model fit vs. Prediction

    When it comes to regression, a lot of people are obsessed (as they should be) with how well a model fits. But what about how well the model can...

    Started by agp‎, 01-13-2013 10:27 AM
    • Replies: 6
    • Views: 2,863
    01-18-2013, 04:53 PM Go to last post
  36. HELP regression with percentage and current $

    Hi i am trying to construct a regression with inflation as my dependent variable and gdp and income as my independent, but i am not sure if it can...

    Started by faizan123‎, 01-12-2013 08:37 PM
    dependent, inflation, percentage, regression, regression analysis
    • Replies: 6
    • Views: 2,472
    01-30-2013, 10:17 AM Go to last post
  37. Determining the Standard Deviation (vice Standard Error) of regression coefficients?

    This is a question Iíve been wondering about for a while, but perhaps itís not possible or perhaps I just need a point in the right direction. I...

    Started by LKM‎, 12-24-2012 02:17 PM
    • Replies: 6
    • Views: 1,585
    01-09-2013, 11:55 AM Go to last post
  38. Interpretation of odds ratio in logistic regression for a logged variable

    Hello, How do we interpret the odds ratio in logistic regression for a logged variable? Thanks in advance.

    Started by zarasandreas‎, 02-05-2013 06:58 AM
    • Replies: 6
    • Views: 3,120
    02-08-2013, 08:43 AM Go to last post
  39. Question Categorical variable as dependent variable

    I have a categorical variable which is like: "How much do you like the sun?" 1 not at all 2 not a great deal 3 neither/nor 4 quite a lot 5...

    Started by Athinagoras‎, 04-12-2013 09:00 AM
    categorical, categorical dependent, dpendent, dummy
    • Replies: 6
    • Views: 1,982
    04-12-2013, 11:28 AM Go to last post
  40. Goodness of fit versus AIC/BIC versus pseudo R squares

    This is geared to Logistic regression I understand in theory you use these for different reasons. AIC for comparing non-nested models and goodness...

    Started by noetsi‎, 03-22-2013 05:17 PM
    • Replies: 6
    • Views: 4,083
    03-25-2013, 10:10 PM Go to last post
  41. OLS regression with dummy dependent AND independent vars

    Disregarding whether probit / logit should be used - I just want to verbally interpret results from an OLS regression where my dependent variable y...

    Started by kbmertz‎, 02-12-2013 02:12 PM
    • Replies: 6
    • Views: 2,896
    02-12-2013, 09:15 PM Go to last post
  42. Help with simple comparing regression results

    Hey guys, I am revising for an exam in a few days and I have pretty much most stuff covered other then a couple of things, and my teacher has emailed...

    Started by supergt‎, 02-04-2013 12:03 PM
    • Replies: 6
    • Views: 1,192
    02-05-2013, 01:21 PM Go to last post
  43. Normality assumption for Regression

    I have an outcome variable that is composed of one item on a 3 point scale to assess participation (none-1, member of 1 program-2, member of both...

    Started by agrig12‎, 02-05-2013 12:00 PM
    normality, regression assumption
    • Replies: 6
    • Views: 2,091
    02-05-2013, 04:04 PM Go to last post
  44. Stepwise regression

    Hi there, I wish someone can help. I will be grateful. I ran a stepwise linear regression in SPSS, and one of the signification predictors was...

    Started by Gary1‎, 04-06-2013 12:57 AM
    • Replies: 6
    • Views: 1,688
    04-11-2013, 02:50 AM Go to last post
  45. NonLinear Regression

    Hello all, I have a pretty general question: Which nonlinear regression is more reliable when you have a small sample of 50 - 70 size one...

    Started by triunk‎, 05-09-2013 08:24 AM
    • Replies: 6
    • Views: 1,582
    06-02-2013, 05:13 AM Go to last post
  46. Logistic Regression Problem - HELP!

    A local health clinic sent fliers to its clients to encourage everyone, but especially older persons at high risk of complications, to get a flue...

    Started by aweimer‎, 05-15-2013 04:53 PM
    odds, regression analysis
    • Replies: 6
    • Views: 3,549
    05-16-2013, 09:39 AM Go to last post
  47. Cross validation in SPSS

    Hi, I need to conduct cross validation of my data to check for predictive validity. This is what I did so far. I divided the sample into two...

    Started by milehigh899‎, 06-10-2013 08:34 AM
    • Replies: 6
    • Views: 13,594
    06-19-2013, 03:34 AM Go to last post
  48. Mispecification

    In theory, or as I understand theory,:p if you leave out a covariate that has a signficant effect on the DV and one IV still in the model you will...

    Started by noetsi‎, 07-02-2013 10:50 AM
    • Replies: 6
    • Views: 1,566
    07-02-2013, 01:55 PM Go to last post
  49. Unequal sample size among sub-groups: Effects on significance levels?

    Hello, I just came across a finding which I find somewhat strange: I conducted a quite simple multiple regression analysis in a dataset that...

    Started by szidel‎, 07-24-2013 01:04 AM
    regression; significance;
    • Replies: 6
    • Views: 5,438
    07-25-2013, 02:37 AM Go to last post
  50. Multivariate regression

    Hello, I am using SPSS 20.0 and am running a multivariate regression using the GLM...

    Started by rkeenan37‎, 07-23-2013 02:58 PM
    multivariate, regression, spss
    • Replies: 6
    • Views: 2,153
    07-24-2013, 12:31 AM Go to last post
  51. Validating regression models

    It is commonly suggested that you use part of the data to generate a model, and then use the rest of the data you withheld from creatng the model to...

    Started by noetsi‎, 07-30-2013 02:12 PM
    • Replies: 6
    • Views: 2,395
    07-31-2013, 09:13 PM Go to last post
  52. Ordinal Logisitc Regression with Soccer

    Hi I have made up some statistical results and would like to analyse them. 2 teams playing against eachother: Team A and Team B There are 3...

    Started by zebbie‎, 07-11-2013 08:36 PM
    • Replies: 6
    • Views: 4,347
    07-15-2013, 10:26 PM Go to last post
  53. Parameters Meaning

    What does parameters a and b represent in the equation y = A + B ln(x) ?

    Started by NSB‎, 07-15-2013 08:44 AM
    • Replies: 6
    • Views: 2,525
    07-15-2013, 05:43 PM Go to last post
  54. Analysis of promotional data by department

    Hi all, I have recently started an internship with a major UK retailer. My project is to come up with a model (and analysis) for promotions that...

    Started by cus003‎, 07-11-2013 02:44 PM
    • Replies: 6
    • Views: 1,198
    07-15-2013, 08:38 AM Go to last post
  55. Understanding coefficient of determination

    Hello everybody Im having some trouble understanding R^2. Almost everywhere, people describe it as the amount of the total variance in y that can...

    Started by RorschachDK‎, 07-16-2013 02:56 PM
    • Replies: 6
    • Views: 2,794
    07-20-2013, 07:12 AM Go to last post
  56. no r-squared calculation for models without the constant

    hi, I ran a multiple regression in Minitab and tried the model without the constant. It worked well but Minitab did not give me the r-squared value....

    Started by rogojel‎, 08-13-2013 12:52 AM
    • Replies: 6
    • Views: 2,734
    08-15-2013, 04:57 AM Go to last post
  57. How to test for Multi-collinearity among dummy explanatory variables

    Hello, Almost all the explanatory variables in my data are dummy variables and I would like to test for multi-collinearity among them. Does it...

    Started by kellyyang‎, 08-09-2013 04:04 PM
    dummy variables, multicollinearity
    • Replies: 6
    • Views: 2,868
    08-19-2013, 04:37 PM Go to last post
  58. Basic Unbiased/Consistency Estimator Definition question

    Hi As below, i was wondering if someone could be kind enough to define these to points with reference to the diagram. I understand the...

    Started by liydg‎, 08-26-2013 01:14 PM
    • Replies: 6
    • Views: 2,175
    08-26-2013, 03:04 PM Go to last post
  59. 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: 7,588
    09-12-2013, 10:23 AM Go to last post
  60. 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: 3,301
    09-23-2013, 04:32 AM Go to last post

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