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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. multiple regression if one corrleation variable is linear, other is nonlinear

    Hello, I am working on soil biology. I have a data set of soil CO2 emissions (dependant variable), with a number of other measured variables...

    Started by goolian‎, 08-07-2014 08:57 PM
    • Replies: 2
    • Views: 487
    08-09-2014, 09:41 AM Go to last post
  2. Post How to estimate quasi-elasticities from marginal effects of logistic regression?

    HI everyone, I am new to this forum. I need some help regarding logistic regression analysis. I am using logistic regression for my research. I...

    Started by abiduaf‎, 08-09-2014 08:11 AM
    logistic regression, quasi-elasticities, r-statisitcs
    • Replies: 0
    • Views: 622
    08-09-2014, 08:11 AM Go to last post
  3. cooks distance cutoff

    Hello, I urgently need to find out what is happening in regards to below: I am doing a huge number of simple linear regressions. For each...

    Started by Deccantraps‎, 08-07-2014 04:37 AM
    cooks distance, outlier detection
    • Replies: 9
    • Views: 4,647
    08-08-2014, 11:18 PM Go to last post
  4. interpretation nonlinear regression output

    I have run a linear regression. The independent variable is supposed to have a nonlinear relation with the dependent variable (both variables are...

    Started by rob1‎, 08-08-2014 02:49 PM
    • Replies: 0
    • Views: 584
    08-08-2014, 02:49 PM Go to last post
  5. Reasons for high lambda in ridge regression?

    I've seen a few papers where they use k-fold cross-validation (k=10) to find the optimal lambda. They end up with huge amounts such as 4000. This is...

    Started by l_davies93‎, 08-08-2014 02:23 PM
    • Replies: 0
    • Views: 454
    08-08-2014, 02:23 PM Go to last post
  6. Interpretation of restricted cubic splines' coefficients

    Hi all, I was wondering whether there is a "not-very-obscure" interpretation of the coefficients (in a regression analysis, like logistic...

    Started by Phaedrus‎, 08-08-2014 05:05 AM
    restricted cubic splines
    • Replies: 0
    • Views: 896
    08-08-2014, 05:05 AM Go to last post
  7. basic 3 year's observations forecasting - need for tips and feedback

    Hello everybody, I need advice about simple forecasting strategies and wondered if anyone here could kindly give me feedback. In each of the four...

    Started by parsec2011‎, 08-08-2014 02:46 AM
    • Replies: 0
    • Views: 348
    08-08-2014, 02:46 AM Go to last post
  8. Comparing regression slopes measured two times withinsubjets?

    Although I am not a statistics-newbee, I have no clue how to contrast the following situation against null-hypothesis, i.e. I don't know how to do...

    Started by statQuestions‎, 08-07-2014 03:09 PM
    • Replies: 3
    • Views: 614
    08-08-2014, 01:33 AM Go to last post
  9. Multiple regression then Sobel for mediation

    Hi, I am doing a mediation analysis. I first ran a multiple regression for IV (2 variables) to mediator. I want to do a Sobel test and use the...

    Started by PsychRachel‎, 08-07-2014 10:31 PM
    • Replies: 1
    • Views: 427
    08-07-2014, 10:33 PM Go to last post
  10. Logistic regression p-value significance

    Dear all, I have done logistic regression for 20 independent variables for which all of them are categorical (0 and 1) also 1 binomial response...

    Started by smurts‎, 08-07-2014 01:44 PM
    • Replies: 3
    • Views: 674
    08-07-2014, 03:17 PM Go to last post
  11. Question about standardizing in ridge regression

    Hey guys I found one or two papers which use ridge regression (for basketball data). I was always told to standardize my variables if I ran a ridge...

    Started by l_davies93‎, 08-07-2014 06:13 AM
    • Replies: 0
    • Views: 423
    08-07-2014, 06:13 AM Go to last post
  12. Upper Envelope on XY Data

    Hi There, I am working with a set of data where I get a scatter as shown in the attached image. When looking at the data, I can convince myself...

    Started by ntlegg‎, 08-05-2014 10:57 AM
    • Replies: 3
    • Views: 644
    08-06-2014, 08:13 AM Go to last post
  13. Interaction effect for quadratic relation

    Looking at the outcome of a linear regression (see also the file enclosed), there is an inverted U-shaped relation between ambidexterity and the...

    Started by rob1‎, 08-05-2014 11:13 AM
    • Replies: 2
    • Views: 564
    08-05-2014, 01:11 PM Go to last post
  14. Constant negative fitted values...am I missing something?

    Hello all, I'm attempting to fit a model where y variable is a variety of $/ha/year figures (all positive) ranging between 0.01 and 2520. The...

    Started by samuelle‎, 08-04-2014 08:54 AM
    glm, linear, negative values
    • Replies: 2
    • Views: 462
    08-05-2014, 05:34 AM Go to last post
  15. Testing multiple interaction variables in logistic regression

    Hi everyone, For a study that I'm currently conducting I want to know the effect of some of my variables on other variables, which I think should...

    Started by mjspijker‎, 08-03-2014 07:18 PM
    how to, interaction variables, logistic regression, model selection
    • Replies: 6
    • Views: 834
    08-04-2014, 08:11 PM Go to last post
  16. Appropriate model for (repeated) data

    I have some cross-sectional data, where I'm interested in estimating a relationship between the "number of items in use" in sector i of country j and...

    Started by longshot‎, 08-01-2014 08:58 PM
    regression analysis, regression equation, regression models, repeated cases, repeated measurements
    • Replies: 0
    • Views: 499
    08-01-2014, 08:58 PM Go to last post
  17. Interaction between time and time-varying between-subjects variable

    I'm struggling with how to think about a question that seems like it should be really straightforward. I have some survey data about regrets...

    Started by CowboyBear‎, 07-31-2014 06:52 PM
    • Replies: 6
    • Views: 770
    08-01-2014, 06:35 PM Go to last post
  18. Smile Correlation between two non stationary time series

    Hey everyone, I'm trying to figure out if there is significant correlation between two non stationary time series (e.g. temperature on a a given...

    Started by s_chrodinger‎, 07-28-2014 06:51 PM
    correlation, monte carlo, non-stationary, regression analysis, time series
    • Replies: 9
    • Views: 2,054
    08-01-2014, 03:03 PM Go to last post
  19. Insignificant coefficients. Fixed effects model.

    Dear all, I have a panel data, and I estimate a regression using fixed-effects model (i.e. I use 'xtreg' command in Stata). The regression is as...

    Started by Man‎, 08-01-2014 02:20 PM
    • Replies: 0
    • Views: 1,002
    08-01-2014, 02:20 PM Go to last post
  20. Bayesian GLM with missing data

    Just while I'm on a roll with simple questions... I'm using MCMCregress {MCMCpack} to do a Bayesian regression in R. My dataset has a good chunk...

    Started by CowboyBear‎, 07-31-2014 07:57 PM
    • Replies: 3
    • Views: 803
    07-31-2014, 10:23 PM Go to last post
  21. Clarifying collinearity

    I am trying to run a regression model where the Y is concentration and predictors are stove type (e.g., stove1, stove 2, stove 3) and fuel type...

    Started by statshelp1234‎, 07-30-2014 06:21 PM
    collinearity, interpret, regression analysis
    • Replies: 3
    • Views: 580
    07-31-2014, 10:46 AM Go to last post
  22. bootstrap validation

    how can we do bootstrap validation in sas?

    Started by nancy10‎, 07-31-2014 09:14 AM
    • Replies: 0
    • Views: 406
    07-31-2014, 09:14 AM Go to last post
  23. Do i need to correct for family wise error when doing moderation and mediation?

    Hi, I've been analyzing data for moderating and mediating relationships and am wondering how necessary it is to correct for family wise error in...

    Started by LisaB‎, 07-30-2014 10:19 PM
    family wise error, mediation, moderation, type i error, type ii error
    • Replies: 0
    • Views: 397
    07-30-2014, 10:19 PM Go to last post
  24. Multivariate repeated measures, binary and continuous

    Hello all. I am working with a data set of multivariate repeated measurements. Specifically, subjects performed an exercise they were taught up to...

    Started by robsncoppers‎, 07-21-2014 04:16 AM
    binary, correlation, hrv, multivariate, regression
    • Replies: 3
    • Views: 660
    07-30-2014, 08:01 PM Go to last post
  25. Bizarre multicollinearity (inferred from VIF) in regression

    I'm really confused about why I have such high VIFs in a multiple regression I've run. My predictors are country (2 different countries, so -1 and...

    Started by psychmajor‎, 07-30-2014 06:39 AM
    multicollinearity, regression, vif
    • Replies: 2
    • Views: 541
    07-30-2014, 05:00 PM Go to last post
  26. Interpreting the regression RMSE when responses are measurements with known SD

    Hi all, I'm fitting a simple regression model (Y = a + bX) where my responses are measurements whose standard deviations, SD, are available....

    Started by fgg‎, 07-19-2014 10:04 PM
    • Replies: 8
    • Views: 2,256
    07-29-2014, 08:11 PM Go to last post
  27. Logistic regression: trouble finding out which variables are significant

    Hi, I'm using logistic regression to analyse a dataset on managerial decision making. Managers have made decisions to fire 2 employees out of a...

    Started by mjspijker‎, 07-29-2014 08:36 AM
    interpreting results, logistic regression, significance
    • Replies: 7
    • Views: 713
    07-29-2014, 07:12 PM Go to last post
  28. How to integrate an interaction term into a fixed effect model?

    Hi, I have a balanced panel data set for t=2. I want to estimate a fixed effects model in the following way: Y= β(0) + β(1)*x + β(2)*z +...

    Started by JB81‎, 07-29-2014 07:21 AM
    • Replies: 0
    • Views: 450
    07-29-2014, 07:21 AM Go to last post
  29. Question about homoscedasticity (for a probably non-linear relation)

    I predict that independent variable X, has an U-shaped relation with dependent variable Y. I test this assumption using a regression analysis...

    Started by rob1‎, 07-28-2014 11:59 AM
    • Replies: 1
    • Views: 596
    07-28-2014, 12:04 PM Go to last post
  30. weight of evidence

    If WOE>0, what does it imply?

    Started by nancy10‎, 07-28-2014 09:11 AM
    • Replies: 0
    • Views: 404
    07-28-2014, 09:11 AM Go to last post
  31. "Averaging" linear trends = linear regression slopes ?

    Hello everyone, I was not able to find a solution for the following question, explaining it with a simple example: We have N=12 weather boxes...

    Started by statQuestions‎, 07-27-2014 05:02 PM
    • Replies: 1
    • Views: 479
    07-27-2014, 06:18 PM Go to last post
  32. correlation of trends?

    Hi, I have extracted trends from two time series (one correspond to some climate parameters, the other one to chemical composition of tree...

    Started by Valido‎, 07-23-2014 04:34 AM
    • Replies: 1
    • Views: 776
    07-27-2014, 05:11 PM Go to last post
  33. Finding correlation of independent variables with a response variable in R

    I have a set of independent variables X1, X2, X3,..., Xn and a response variable Y. I want to perform some form of data analysis in R so that I only...

    Started by osmankhalid2005‎, 07-26-2014 09:00 PM
    correlation analysis, multi linear regression
    • Replies: 3
    • Views: 800
    07-27-2014, 07:23 AM Go to last post
  34. Extend economics thesis with multivariate analysis

    Dear all, Working on my Master Thesis I got the remark from my supervisor that I have to extend the research with a multivariate analysis. I have...

    Started by MaartenvK‎, 07-26-2014 07:31 AM
    economics, multiple, multivariate, multivariate analysis, regression analysis
    • Replies: 3
    • Views: 612
    07-27-2014, 06:11 AM Go to last post
  35. choosing β0 and β1 to minimize the residual sum of squares

    I'm reading a book called , and I have a question in regards to the material inside. I understand that we can find the residual sum of squares by...

    Started by Frenchie‎, 07-27-2014 12:53 AM
    • Replies: 0
    • Views: 1,816
    07-27-2014, 12:53 AM Go to last post
  36. Exclamation Partial Least Square Regression_Interpretation of Result_VIP_Model Equation_urgentpls

    Hello! I would like to ask your help about the interpretation of my results. So I am doing an analysis about which among the environmental predictors...

    Started by desireeeve‎, 07-26-2014 07:43 AM
    interpreting output, interpreting regression, model, multiple regression
    • Replies: 6
    • Views: 763
    07-26-2014, 12:53 PM Go to last post
  37. Change score as the DV with change scores as IVs - Category mistake?

    I have a theory that needs to be tested. The idea is that an IV "change in the knowledge of", and an IV "change in the sense of importance" of...

    Started by urban_planner‎, 07-26-2014 02:35 AM
    • Replies: 0
    • Views: 432
    07-26-2014, 02:35 AM Go to last post
  38. Looking for a good beginners guide to Regression Analysis using Excel

    I am looking for a good beginners guide to Regression Analysis using Excel. Any recommendations? Thanks!

    Started by stat_101‎, 07-25-2014 12:14 PM
    regression analysis
    • Replies: 2
    • Views: 521
    07-25-2014, 02:33 PM Go to last post
  39. When removing influential outliers creates more, what then?

    Hello good folks, I am conducting multiple regression for a meta analysis, with the dependent y variable being a range of values ($/ha/year)...

    Started by samuelle‎, 07-24-2014 10:32 AM
    • Replies: 7
    • Views: 1,279
    07-25-2014, 09:49 AM Go to last post
  40. Multiple Regression while variables kept constant


    Started by noslehs‎, 07-17-2014 09:13 AM
    • Replies: 6
    • Views: 897
    07-23-2014, 04:02 PM Go to last post
  41. Dummy Variable Interactions

    Hi all, At the moment I'm working on an analysis of wage inequality and have come across a considerable stumbling block. I am trying to compare...

    Started by highlux‎, 07-23-2014 02:33 AM
    • Replies: 2
    • Views: 582
    07-23-2014, 02:39 PM Go to last post
  42. Best regression model when I am just using dummy variables as independent variables

    Dear all I am just wondering where to find help for my question. Hopefully this is the right place with many smart people. I am currently...

    Started by Kies886‎, 07-23-2014 08:45 AM
    • Replies: 1
    • Views: 462
    07-23-2014, 08:56 AM Go to last post
  43. R squared and Standard Error

    Hi, Can standard error be 94.10 when R squared is 0.67 in a linear model? Thanks.

    Started by john_f‎, 07-17-2014 06:29 AM
    r squared, standard error
    • Replies: 7
    • Views: 881
    07-22-2014, 03:31 PM Go to last post
  44. ATE - teffects vs xtlogit

    Hi. I am measuring the average treatment effect on two groups, using STATA´s teffects regression adjustment estimator. The STATA output reports...

    Started by Kristian Korbu‎, 07-22-2014 07:15 AM
    • Replies: 0
    • Views: 549
    07-22-2014, 07:15 AM Go to last post
  45. Scaling independent variable in regression

    I have a long data set collected over time on two variables and have done linear and polynomial regression on it with good results. I want to...

    Started by sdis‎, 07-20-2014 12:36 PM
    • Replies: 1
    • Views: 522
    07-20-2014, 07:12 PM Go to last post
  46. Post How to model my variables into a probit

    Hey guys, Got a tricky issue here... I am trying to estimate a probit model. The binary dependent variable is employment status and the...

    Started by Dwayne Johnson‎, 07-20-2014 03:38 PM
    • Replies: 0
    • Views: 436
    07-20-2014, 03:38 PM Go to last post
  47. Test of Significance - Confidence Interval

    Hi All, I need some help from any kind soul who is able to shed some light on my query: I have a 95% confidence interval for a mediation effect...

    Started by timneill‎, 07-20-2014 05:34 AM
    • Replies: 0
    • Views: 572
    07-20-2014, 05:34 AM Go to last post
  48. Odds ratio of 1 for bivariate logistic regression

    My wonderous memory is that an odds ratio near 1 is not remotely substantively important, much like a zero slope would be in OLS. But I have a highly...

    Started by noetsi‎, 06-18-2012 08:40 PM
    • Replies: 14
    • Views: 4,487
    07-19-2014, 03:51 PM Go to last post
  49. Logistic Regression - Interpretation issue - Odds Ratios near 1

    Hello, I have some several doubts about the logistic regression. I am working with stata in the logisitc regression and my binary input variables...

    Started by EisnerK‎, 07-19-2014 11:55 AM
    • Replies: 0
    • Views: 395
    07-19-2014, 11:55 AM Go to last post
  50. Repeated measure nested within individuals?

    Hi, All, (I'm a beginner so my question could be really dumb...) So, I have a set of data that contains 30 schools' variable A and variable B....

    Started by shenyushui‎, 07-17-2014 01:03 PM
    • Replies: 1
    • Views: 526
    07-17-2014, 01:46 PM Go to last post
  51. Regression of calories consumed and body weight

    So I want to understand whether the relationship between calories consumed and body weight differs between males and females. I have data from 20...

    Started by emily.stats‎, 07-17-2014 11:09 AM
    • Replies: 2
    • Views: 567
    07-17-2014, 11:30 AM Go to last post
  52. Logistic regression significant test

    Dear all, I have done logistic regression for 20 independent variables for which all of them are categorical (0 and 1) also 1 binomial response...

    Started by smurts‎, 07-16-2014 10:06 AM
    • Replies: 4
    • Views: 697
    07-16-2014, 05:50 PM Go to last post
  53. Test for absolute value of coefficient

    After running a simple linear regression I estimate a coefficient beta. I want to test the null that the absolute value of beta is less than or...

    Started by Laurie‎, 07-16-2014 04:06 PM
    • Replies: 0
    • Views: 462
    07-16-2014, 04:06 PM Go to last post
  54. What kind of regression should I use?

    I have next problem. I want to investigate the relation between life stages (string variable) and organizational ambidexterity (numeric variable),...

    Started by rob1‎, 07-16-2014 11:19 AM
    • Replies: 0
    • Views: 450
    07-16-2014, 11:19 AM Go to last post
  55. In a negative binomial GLM or GLMM what does theta stand for?

    When using a GLM or GLMM with a negative binomial distribution in R it is usually necessary to set the value of theta in the model. But what does...

    Started by shardman‎, 07-16-2014 11:10 AM
    glm, glmm, negative binomial, theta
    • Replies: 0
    • Views: 591
    07-16-2014, 11:10 AM Go to last post
  56. Unexpected output for multivariate logistic regression

    Hi, After I'd tested a couple of univariate logistic regressions for all of my IVs, I runned a multivariate logistic regression with all the IVs...

    Started by c_alderweireld‎, 07-16-2014 06:28 AM
    • Replies: 2
    • Views: 590
    07-16-2014, 08:50 AM Go to last post
  57. Smile Derived importance of attributes in a political survey

    Hello! I'd like to ask some help with determining derived importance of attributes (like what are given by Shapley values /...

    Started by thehiggsboson‎, 06-18-2014 10:49 AM
    • Replies: 1
    • Views: 1,052
    07-15-2014, 07:35 PM Go to last post
  58. Multinomial Logit model does not reflect the data - Possible explanations?

    I am running a study in which respondents are physicians shown patient profiles based on pre-determined characteristics (e.g. age, patient history,...

    Started by Injektilo‎, 07-15-2014 07:27 PM
    • Replies: 0
    • Views: 498
    07-15-2014, 07:27 PM Go to last post
  59. Reverted coefficient

    Dear all, I really hope somebody can help me out here. I have a problem concerning the outcome of my hierarchical multiple regression model. I...

    Started by MaxStat‎, 07-15-2014 08:49 AM
    • Replies: 4
    • Views: 651
    07-15-2014, 02:39 PM Go to last post
  60. Durbin Watson related with outliers?

    I am trying to run a multiple regression with a sample data belongs to a cohort of 500 subjects. My dependant variable is a psychological score...

    Started by rezzak‎, 07-14-2014 09:15 AM
    durbin watson, outliers
    • Replies: 3
    • Views: 1,096
    07-15-2014, 10:07 AM Go to last post

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