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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Question WLS Confidence interval

    Guys can anyone assist? I've googled and read lots on the matter of WLS (mainly lecture notes from asorted university courses google finds)....

    Started by dj_johnphillips‎, 06-23-2015 10:31 AM
    • Replies: 3
    • Views: 2,685
    06-24-2015, 02:09 AM Go to last post
  2. Experiment Design Help please

    Hi All I have used a Central Composite Design (CCD) for my experiments, where I have three Factors (A, B, c) and each Factor has five values. I have...

    Started by Dlair‎, 06-21-2015 08:16 AM
    • Replies: 2
    • Views: 1,645
    08-04-2015, 05:15 PM Go to last post
  3. Comparing coefficients from two separate regressions

    I have done my best to do an extensive literature review to answer this question, but I've frustratingly found nothing. So I would appreciate any...

    Started by dlh8‎, 02-09-2014 08:35 PM
    3 Pages
    1 2 3
    • Replies: 33
    • Views: 6,399
    02-18-2014, 03:01 PM Go to last post
  4. Willingness To Pay is out of ranges of bids asked in survey

    Hello, I'm trying to estimate the willingness to pay (WTP) for whale watching by using a probit model (the results are similiar with a logit). But...

    Started by dmitre88‎, 08-23-2012 03:26 PM
    bid, logit, probit, whale watching, wtp
    • Replies: 2
    • Views: 2,155
    08-27-2012, 10:26 PM Go to last post
  5. Weighty issue...

    Hi I have a conceptual issue with some data I am analysing. I am looking at the point prevalence of a particular disease as reported in medical...

    Started by dml123‎, 11-19-2010 04:59 AM
    • Replies: 0
    • Views: 2,378
    11-19-2010, 04:59 AM Go to last post
  6. Comparing coefficients for nested logistic regressions

    Hi, maybe one out there can help. I am interested in comparing the coefficients of two binary logistic models. In one nested in the other one,...

    Started by dnh‎, 11-22-2010 04:09 PM
    • Replies: 9
    • Views: 4,432
    11-24-2010, 08:45 AM Go to last post
  7. Nested data structure

    Hi, I wonder whether the community can help. The goal is to run a series of regressions with correctly estimated standard errors. Note that the...

    Started by dnh‎, 05-13-2015 05:59 AM
    • Replies: 0
    • Views: 1,445
    05-13-2015, 05:59 AM Go to last post
  8. Level-2 in growth models

    Dear all, Perhaps someone could help me with a more detailed explanation why time is specified as a level-2 variable in the growth models...

    Started by dnh‎, 08-19-2016 05:25 AM
    • Replies: 0
    • Views: 566
    08-19-2016, 05:25 AM Go to last post
  9. Regression on a non-normal dependant variable

    Hi there, This situation is new to me: I have non-normal DV, for which no proper non-linear transformation (that I know of) exists. It is a score...

    Started by do999‎, 05-24-2011 11:26 AM
    • Replies: 2
    • Views: 3,698
    05-24-2011, 12:33 PM Go to last post
  10. Negative Binomial Regression in R

    Hi all, I am fairly new to the R world. I need some help with correct syntax for running a negative binomial regression/zero-inflation negative...

    Started by docddk‎, 06-13-2014 01:16 PM
    census data, negative binomial, regression, zero-inflation
    • Replies: 0
    • Views: 1,936
    06-13-2014, 01:16 PM Go to last post
  11. Stepwise Regression

    Let Y = Company Sales X1 = Overall Industry Sales X2 = Advertising Expenditure X3 = Special Promotion by Competitor (0 = Yes, 1 = No) Using...

    Started by doctorwho‎, 04-24-2010 08:47 PM
    • Replies: 2
    • Views: 5,877
    04-26-2010, 02:30 PM Go to last post
  12. Categorical dependent variables / ANOVA

    Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

    Started by DOER‎, 03-05-2014 10:34 AM
    • Replies: 14
    • Views: 2,912
    03-10-2014, 09:27 AM Go to last post
  13. Binary logistic regression with extremely biased response variable

    Hi, for a study to be published as a paper, I have collected data in which my binary response variable Y is highly biased towards Y=0 (it's Y=0...

    Started by Dohans‎, 05-19-2012 03:56 AM
    • Replies: 0
    • Views: 1,933
    05-19-2012, 03:56 AM Go to last post
  14. Zero-inflated continuous independent variables

    Are there ways of handling zero-inflated continuous independent variables?

    Started by doh_ramey‎, 11-01-2012 08:22 AM
    • Replies: 4
    • Views: 6,042
    11-01-2012, 10:44 AM Go to last post
  15. Std Error of nonlinear regression coefficients

    Hi There, I have a commercial NET dll computing nonlinear regression coefficients and their sigma values. However, I would like to compute the...

    Started by Dolphin72‎, 03-10-2011 08:11 PM
    coefficient, nonlinear, standard error
    • Replies: 0
    • Views: 3,622
    03-10-2011, 08:11 PM Go to last post
  16. Calculating confidence bands for nonlinear regression

    Hi, I am trying to find a way to calculate the 95% confidence bands for nonlinear regression. I have found the following text on the web, but I do...

    Started by Dolphin72‎, 05-05-2011 11:53 AM
    confidence bands, nonlinear, regression
    • Replies: 0
    • Views: 2,808
    05-05-2011, 11:53 AM Go to last post
  17. zero value of the regression parameter

    Hello. I would like to ask if anyone knows a website with the theme: regression testing parameter. I need only theory on the topic (to school). Just...

    Started by Dominik556‎, 04-25-2016 09:51 AM
    • Replies: 5
    • Views: 1,320
    04-25-2016, 09:33 PM Go to last post
  18. Regression and imputing zeros

    Hi all! I have what is likely a simple regression problem. I am imputing Variable X from survey Y to survey Z. I am using a simple linear...

    Started by domwebber‎, 08-28-2015 03:55 AM
    hotdeck, imputation, linear regression, stata 12
    • Replies: 2
    • Views: 2,083
    09-24-2015, 02:16 PM Go to last post
  19. Combining several regression

    Sorry for this simple, maybe idiotically so, question :) I'm trying to make a very basic model for basketball, though the sport doesn't really...

    Started by donkstafari‎, 10-13-2013 12:16 PM
    • Replies: 1
    • Views: 1,407
    10-14-2013, 11:24 AM Go to last post
  20. help with mediation analysis

    hey- i just conducted a study with 2 IVs and 1 DV, i found statistically signification relationships between IV1 and the DV and IV2 and the DV. I...

    Started by donthatekate‎, 07-16-2017 06:37 PM
    • Replies: 0
    • Views: 358
    07-16-2017, 06:37 PM Go to last post
  21. Low R-squared, but my variables fit expectations

    So I ran a regression on 3 different sets of data estimation techniques versus actual survey data. The dependent variable was the non-survey...

    Started by dontpunkme‎, 09-10-2010 09:40 PM
    • Replies: 1
    • Views: 13,669
    09-16-2010, 10:55 AM Go to last post
  22. 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: 1,525
    10-22-2015, 04:03 PM Go to last post
  23. [Help -please!] Multiple Regression Model

    all done now

    Started by doomedromance‎, 06-05-2010 02:35 AM
    • Replies: 1
    • Views: 2,856
    06-05-2010, 04:55 PM Go to last post
  24. Question HLM - non-linear IV and placement of individual characteristics in the model

    Hi all! I am working on my dissertation and run across a couple of questions when structuring HLM model. The data looks as follows: I conducted an...

    Started by doroshishka‎, 06-22-2017 05:04 PM
    categorical variables, hlm, variable in model
    • Replies: 0
    • Views: 389
    06-22-2017, 05:04 PM Go to last post
  25. Interaction term

    Hi, I'm running linear regressions (1) Y = a + b and (2) Y = a + b + axb The coefficients for a and b in (1) have positive signs which are...

    Started by dou‎, 05-22-2011 10:23 AM
    • Replies: 3
    • Views: 3,009
    05-23-2011, 04:49 AM Go to last post
  26. Large coefficient problem

    Hello, i'm running linear regressions for a large cross country panel data: the simplified term is similar to y = a + b + axb. When I run...

    Started by dou‎, 05-23-2011 04:21 AM
    • Replies: 3
    • Views: 3,032
    05-23-2011, 05:20 AM Go to last post
  27. Is it normal to have negative constants?

    I was wondering whether we must include an intercept term in our equation? Also I have negative (some) significant constants. I know it means that...

    Started by dou‎, 05-23-2011 04:26 AM
    • Replies: 2
    • Views: 3,903
    05-25-2011, 12:20 AM Go to last post
  28. Changes in the level of Significance

    I use standard errors for significance. Basically there is no problem with the significance, the problem is how to interprete the results. The...

    Started by dou‎, 09-01-2011 03:42 AM
    • Replies: 2
    • Views: 2,521
    09-02-2011, 04:45 AM Go to last post
  29. Interaction effects regression wiith dummy variables

    Hello everyone, I am doing an analysis about the export diversification effect during the financial crisis. I have my dependent variable as log...

    Started by doug_aguilar‎, 08-24-2017 07:34 AM
    dummy variables, estimating equations, multicollinearity, regression analysis
    • Replies: 5
    • Views: 329
    08-25-2017, 09:19 AM Go to last post
  30. Find expected value and variance of ARMA(1,1) model

    My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

    Started by downthesun01‎, 04-25-2011 06:13 PM
    • Replies: 3
    • Views: 13,211
    04-27-2011, 02:11 AM Go to last post
  31. Stationarity of Seasonal Box-Jenkins Model

    We've been working on group projects where we were given a set a of seasonal data, and from it create a Box-Jenkins model. In class, we were that...

    Started by downthesun01‎, 05-03-2011 02:50 AM
    • Replies: 0
    • Views: 2,241
    05-03-2011, 02:50 AM Go to last post
  32. Basic multiple regression question

    Sorry, should've probably specified linear regression. I was given a data and ran a proc corr on it in sas. As you can see, x1 through x5...

    Started by downthesun01‎, 11-16-2011 01:00 AM
    • Replies: 7
    • Views: 2,300
    11-25-2011, 05:22 AM Go to last post
  33. Exclamation GLM diagnostic plots in r

    I am trying to fit a Gamma glm in R. getting very weird diagnostics even though all variables are significant. Please advise as to how i can improve...

    Started by doy_h(r)‎, 06-04-2015 02:56 PM
    • Replies: 3
    • Views: 2,851
    06-05-2015, 07:49 AM Go to last post
  34. Significant categorical variable as predictor in binary logistic regression

    Hi all, If you could help with this, it would be SO appreciated. I have a model in which I am predicting a dichotomous variable. The predictors are...

    Started by dpfaff‎, 04-30-2013 09:24 PM
    • Replies: 2
    • Views: 2,584
    05-01-2013, 12:03 PM Go to last post
  35. scale issues

    Please look at the following descriptive labels for a scale of importance. Extremely critical (7) Highly important (6) Very Important (5) ...

    Started by Dr.Appalayya‎, 10-17-2009 04:53 AM
    • Replies: 4
    • Views: 2,615
    10-19-2009, 08:11 AM Go to last post
  36. How are F-Values, R-Square and Adjusted R-Square calculated in Regression?

    How are F-Values, R-Square and Adjusted R-Square calculated in Regression Analysis?

    Started by Dr.Appalayya‎, 06-02-2012 10:55 PM
    • Replies: 0
    • Views: 2,164
    06-02-2012, 10:55 PM Go to last post
  37. Multicollinearity of categorical variables in linear regression

    Running a linear regression which includes mostly continuous variables as predictors, but one categorical predictor (which I have dummy coded as...

    Started by Dr.J‎, 05-30-2014 01:10 PM
    • Replies: 0
    • Views: 2,411
    05-30-2014, 01:10 PM Go to last post
  38. Using mixed-effects models

    Hello, I have been asking a series of questions within this forum and have had wonderful advice given. However as my statistics knowledge is...

    Started by Dragonwalker‎, 12-30-2011 01:18 PM
    • Replies: 2
    • Views: 1,857
    12-30-2011, 04:44 PM Go to last post
  39. 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: 2,029
    03-21-2012, 12:28 PM Go to last post
  40. 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: 1,868
    03-24-2012, 09:59 AM Go to last post
  41. 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: 1,518
    03-25-2012, 01:01 PM Go to last post
  42. a question about estimates in mixed models

    Hello, I was hoping to be able to find all of the estimates of covariates and of the categories with a number of factors. I found a similar study...

    Started by Dragonwalker‎, 03-28-2012 12:55 AM
    • Replies: 0
    • Views: 1,297
    03-28-2012, 12:55 AM Go to last post
  43. Linear Regression for Traffic Data

    Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

    Started by dramachandran‎, 10-11-2010 06:46 PM
    • Replies: 3
    • Views: 4,788
    10-13-2010, 11:25 AM Go to last post
  44. Building my 1st model please help!!

    Hi there, First of all please excuse my lack of knowledge of the subject I have just started a course in Econometrics and find using the...

    Started by Drareg‎, 05-07-2011 09:49 AM
    building regression model
    • Replies: 3
    • Views: 2,669
    05-16-2011, 12:07 PM Go to last post
  45. I(1)?deterministic trend? you could probably answer this!

    Hey all I am using the Augmented Dickey-Fuller test on EViews7 to test for stationarity in two series; ln(employment) and the ln(wage rate). Both...

    Started by Drareg‎, 06-04-2011 05:33 AM
    • Replies: 0
    • Views: 2,563
    06-04-2011, 05:33 AM Go to last post
  46. Arrow Multiple Linear Regression: How to Calculate the Coefficient

    This post has been deleted.

    Started by Draze‎, 02-02-2010 08:56 AM
    • Replies: 3
    • Views: 16,234
    02-08-2010, 12:03 PM Go to last post
  47. Question How to Calculate the Coefficient of Multiple Regression

    Hi Statistic Gurus I'm not really familar with multiple linear regression, and despite countless hours on google, I havn't found any clear...

    Started by Draze‎, 02-24-2010 04:33 AM
    • Replies: 2
    • Views: 10,446
    02-24-2010, 07:24 AM Go to last post
  48. Factor Analysis

    I ran the factor analysis, but I want to make sure I have the groupings right. I am attaching my analysis and the rotated component matrix has...

    Started by drdokter‎, 11-13-2010 09:31 AM
    • Replies: 1
    • Views: 2,347
    11-13-2010, 02:15 PM Go to last post
  49. Pos. or Neg. Correlation with Error Term?

    in IV regression, how can I tell if an endogenous variable (Pi) is positively or negatively correlated with the error term? The only information I...

    Started by dreed05‎, 11-28-2012 09:34 PM
    • Replies: 0
    • Views: 1,971
    11-28-2012, 09:34 PM Go to last post
  50. warning - may require help

    Hello all you stats, and indeed non-stats, fowk I'm reasonably au fait with my stats methods. However, I don't have access to SPSS, which is my...

    Started by drewmac‎, 07-31-2011 10:09 PM
    • Replies: 1
    • Views: 1,769
    08-01-2011, 03:48 AM Go to last post
  51. Lmer Output/: variable re-levelling

    Morning/Evening all I'm having a bit of a time getting the LME4 package to list ALL of my IVs, rather than all-1. By way of example, here is my...

    Started by drewmac‎, 09-04-2011 04:18 PM
    binomial, lmer, logistic regression, r package
    • Replies: 7
    • Views: 6,146
    09-06-2011, 06:56 AM Go to last post
  52. 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: 3,363
    03-13-2012, 12:29 AM Go to last post
  53. Regression: GLM vs. Lmer question

    Hi group, I've typically conducted my regressions, both linear and logistic, using the lmer function from lme4. However, having read around a bit...

    Started by drewmac‎, 12-04-2013 07:38 AM
    • Replies: 3
    • Views: 2,871
    12-04-2013, 01:46 PM Go to last post
  54. Do I need to control for Type 1 errors?

    Hi guys, the situation I have is, a reviewer has asked me to reduce my mediation model (MPLUS) as he says I have too many tests going on. In fairness...

    Started by DrFurbs‎, 01-10-2015 02:31 PM
    • Replies: 5
    • Views: 2,278
    01-14-2015, 03:09 PM Go to last post
  55. GLM repeated measurements with very large database

    I am trying to perform a multivariate regression analysis in SPSS. The problem is the database is very large (one variable contains over 200.000...

    Started by drGG‎, 01-27-2011 08:42 AM
    • Replies: 0
    • Views: 2,905
    01-27-2011, 08:42 AM Go to last post
  56. Regression for CAPM.. Finance

    I am testing CAPM (a financial model) using regression. Would It be correct to say that 'c' (the constant) is equal to the alpha? Thanks

    Started by drinu_89‎, 12-22-2010 03:07 AM
    • Replies: 2
    • Views: 5,231
    12-26-2010, 07:24 PM Go to last post
  57. Transforming skewed data without decreasing kurtosis

    Have a data set with negative kurtosis and skewness values. Have tried numerous transformations but cannot find a solution that generates acceptable...

    Started by DrJames‎, 02-06-2015 03:09 PM
    • Replies: 4
    • Views: 2,408
    02-07-2015, 12:52 PM Go to last post
  58. Hot to analyze data at various levels (company and employee)?

    I have a data set with data at two different levels. I want to analyze the perceptions of employees of a specific management practice. The data...

    Started by DrJames‎, 02-20-2015 06:19 PM
    • Replies: 1
    • Views: 2,239
    02-25-2015, 12:45 PM Go to last post
  59. Logistic Regression - predicted probabilities opposite to actual percentages

    Hi! I've asked this question elsewhere but haven't yet got a response that makes much sense to me... I have conducted a logistic regression in...

    Started by DrJay‎, 07-13-2017 08:52 AM
    • Replies: 6
    • Views: 472
    07-17-2017, 03:40 AM Go to last post
  60. P-value for a regression where expected slope is 1:1

    Hi, I am comparing two values for vegetation cover from two time periods. The expected value is y=x for the slope. I am curious how to calculate a...

    Started by drm258‎, 11-23-2016 07:09 PM
    • Replies: 6
    • Views: 2,989
    11-26-2016, 09:40 AM Go to last post

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