1. 10-14-2010
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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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, Today 01:35 AM
    • Replies: 0
    • Views: 32
    Today, 01:35 AM Go to last post
  2. 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 09:04 PM
    • Replies: 6
    • Views: 228
    Yesterday, 08:51 PM Go to last post
  3. 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, Yesterday 11:14 AM
    regression analysis
    • Replies: 2
    • Views: 70
    Yesterday, 01:33 PM Go to last post
  4. 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 09:32 AM
    • Replies: 7
    • Views: 147
    Yesterday, 08:49 AM Go to last post
  5. Multiple Regression while variables kept constant


    Started by noslehs‎, 07-17-2014 08:13 AM
    • Replies: 6
    • Views: 190
    07-23-2014, 03:02 PM Go to last post
  6. 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 01:33 AM
    • Replies: 2
    • Views: 88
    07-23-2014, 01:39 PM Go to last post
  7. 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 07:45 AM
    • Replies: 1
    • Views: 90
    07-23-2014, 07:56 AM Go to last post
  8. 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 03:34 AM
    • Replies: 0
    • Views: 64
    07-23-2014, 03:34 AM Go to last post
  9. 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 05:29 AM
    r squared, standard error
    • Replies: 7
    • Views: 215
    07-22-2014, 02:31 PM Go to last post
  10. 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 06:15 AM
    • Replies: 0
    • Views: 76
    07-22-2014, 06:15 AM Go to last post
  11. 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 03:16 AM
    binary, correlation, hrv, multivariate, regression
    • Replies: 1
    • Views: 87
    07-22-2014, 04:10 AM Go to last post
  12. 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 11:36 AM
    • Replies: 1
    • Views: 108
    07-20-2014, 06:12 PM Go to last post
  13. 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 02:38 PM
    • Replies: 0
    • Views: 76
    07-20-2014, 02:38 PM Go to last post
  14. 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 04:34 AM
    • Replies: 0
    • Views: 129
    07-20-2014, 04:34 AM Go to last post
  15. 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 07:40 PM
    • Replies: 14
    • Views: 2,607
    07-19-2014, 02:51 PM Go to last post
  16. 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 10:55 AM
    • Replies: 0
    • Views: 107
    07-19-2014, 10:55 AM Go to last post
  17. 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 12:03 PM
    • Replies: 1
    • Views: 136
    07-17-2014, 12:46 PM Go to last post
  18. 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 10:09 AM
    • Replies: 2
    • Views: 120
    07-17-2014, 10:30 AM Go to last post
  19. 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 09:06 AM
    • Replies: 4
    • Views: 173
    07-16-2014, 04:50 PM Go to last post
  20. 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 03:06 PM
    • Replies: 0
    • Views: 129
    07-16-2014, 03:06 PM Go to last post
  21. 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 10:19 AM
    • Replies: 0
    • Views: 115
    07-16-2014, 10:19 AM Go to last post
  22. 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 10:10 AM
    glm, glmm, negative binomial, theta
    • Replies: 0
    • Views: 75
    07-16-2014, 10:10 AM Go to last post
  23. 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 05:28 AM
    • Replies: 2
    • Views: 111
    07-16-2014, 07:50 AM Go to last post
  24. 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 09:49 AM
    • Replies: 1
    • Views: 142
    07-15-2014, 06:35 PM Go to last post
  25. 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 06:27 PM
    • Replies: 0
    • Views: 105
    07-15-2014, 06:27 PM Go to last post
  26. 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 07:49 AM
    • Replies: 4
    • Views: 120
    07-15-2014, 01:39 PM Go to last post
  27. 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 08:15 AM
    durbin watson, outliers
    • Replies: 3
    • Views: 138
    07-15-2014, 09:07 AM Go to last post
  28. age groups vs continous

    hello everyone, I am curious to know if there are any best practices when dealing with age variables for a logistic regression model. I currently...

    Started by swoonef‎, 07-14-2014 02:06 PM
    • Replies: 5
    • Views: 159
    07-15-2014, 07:06 AM Go to last post
  29. Determine how much data is required by determining when graph levels out

    I have a bunch of graphs for data that I have collected in my last experiment. The graphs are usually shaped similar to either exponential curves or...

    Started by Phdstudentz‎, 07-11-2014 05:13 PM
    levels out, minimum data, steady state
    • Replies: 12
    • Views: 358
    07-15-2014, 06:52 AM Go to last post
  30. Curve fitting of individual or multiples curves

    Hi, In curve fitting, Is it acceptable to perform a curve fitting of multiples curves overlaped in the same plot or is it neccesary to fit each curve...

    Started by chuy‎, 07-13-2014 11:11 AM
    fitting a curve
    • Replies: 0
    • Views: 100
    07-13-2014, 11:11 AM Go to last post
  31. What I can conclude if the CI of different regression models are not overlapping?

    I asked to build a graph of the means and confidence intervals of β1 values from 4 regression models and conclude about their statistical...

    Started by Scrooge‎, 07-11-2014 02:51 PM
    • Replies: 4
    • Views: 143
    07-12-2014, 11:33 AM Go to last post
  32. Using pooled OLS when running a model with panel data?

    How bad is it to use pooled OLS instead of fixed effects when you have 7 years of panel data? From what I have understood, the risk is that the...

    Started by Eric_B‎, 06-18-2014 04:23 AM
    • Replies: 1
    • Views: 222
    07-12-2014, 06:46 AM Go to last post
  33. Question General Linear Model

    My objective is to identify (F Ratio) the few independent variables in my manufacturing process that are affecting my dependent variable. My data...

    Started by Sdruley‎, 07-11-2014 05:44 PM
    • Replies: 2
    • Views: 140
    07-12-2014, 04:25 AM Go to last post
  34. Help a newbie with multiple statistical regression.

    I want to run a multiple stastical regression in SPSS, trying to correlate different biomarkers with a brain region (hippocampus), at the same...

    Started by trexter‎, 07-08-2014 11:16 AM
    • Replies: 4
    • Views: 225
    07-10-2014, 07:28 AM Go to last post
  35. 6 factors and a response

    Hello All, I have a spreadsheet with 6 factors and 1 response... i'm not sure if all the factors effect the response but I'm hoping there is a...

    Started by ilikeshirt‎, 07-04-2014 10:54 AM
    • Replies: 10
    • Views: 277
    07-08-2014, 10:52 AM Go to last post
  36. Required testing for poisson and negative binominal regression

    Hello everybody, I am making use of a poisson regression and a negative binominal regression. I am familiar with testing OLS-regression, but what...

    Started by geomo‎, 07-08-2014 10:08 AM
    • Replies: 0
    • Views: 90
    07-08-2014, 10:08 AM Go to last post
  37. Will a logarithmic transformation create curvilinearity?

    Hello All, Ok, I'm a bit stuck on this one. I ran a logarithmic transformation on my DV to overcome a serious skew and now I'm seeing quite a few...

    Started by Rob1983‎, 07-08-2014 08:01 AM
    • Replies: 2
    • Views: 92
    07-08-2014, 09:41 AM Go to last post
  38. Linear regression - missing data

    Hi, I am running a multiple linear regression which seems to be working well except for one problem: One of the explanatory variables is: does...

    Started by Emma93‎, 07-08-2014 02:46 AM
    • Replies: 0
    • Views: 152
    07-08-2014, 02:46 AM Go to last post
  39. understanding lending rates on lending applications

    Hi there, I was wondering if anyone had experience in modelling lending rates on lending applications? How do you interpret a negative...

    Started by kchan‎, 07-07-2014 08:07 PM
    • Replies: 0
    • Views: 89
    07-07-2014, 08:07 PM Go to last post
  40. Modelling help for poisson distribution

    I do feel like I'm running in circles here. I've a data set of rates (ie 40/1000) of about 1500 cases that fits a poisson distribution. This is the...

    Started by Hudson22‎, 07-07-2014 03:37 PM
    • Replies: 0
    • Views: 114
    07-07-2014, 03:37 PM Go to last post
  41. Age-adjusted incidence rate ratios using Poisson regression

    Hi All- I want to set up a SAS model for Poisson regression that will give me the age-adjusted incidence rate ratio for the incident cancer rate in...

    Started by kijohnson‎, 07-07-2014 12:46 PM
    • Replies: 0
    • Views: 84
    07-07-2014, 12:46 PM Go to last post
  42. Estimating 1 cointegrating relationship when trace test indicates rank=2

    Hi all, I am estimating a Vector Error Correction Model for several countries. For one country (call it X), the Johansen trace test suggests that...

    Started by CLP_PS‎, 07-04-2014 10:36 PM
    • Replies: 0
    • Views: 130
    07-04-2014, 10:36 PM Go to last post
  43. normality transformation and regression

    Hi, I have performed 1/sqrtY, and sqrtY transformations on different data sets to achieve normal distribution for simple linear regressions. So...

    Started by Deccantraps‎, 07-03-2014 03:52 AM
    normality transformation, regression
    • Replies: 6
    • Views: 199
    07-04-2014, 03:11 AM Go to last post
  44. Question help with different sample size contrast matrix in linear regression

    Hi everyone, I am very confused about the contrast matrix, could some one explain a little bit for me? Or could you please give a link or book...

    Started by crazyhottommy‎, 07-03-2014 09:04 PM
    • Replies: 0
    • Views: 122
    07-03-2014, 09:04 PM Go to last post
  45. winsorisation of a numerical scale from 1 to 23 assigned to the credit rating

    Dear Members, Iam preparing a regression model and my supervisor told me to winsorise all the variables. However, among the variables I have a...

    Started by granis89‎, 07-03-2014 05:59 PM
    credit rating, linear regression, outliers, winsorization
    • Replies: 0
    • Views: 152
    07-03-2014, 05:59 PM Go to last post
  46. Understanding output of logistic regression

    Hi I would appreciate if someone could help me with understanding the output of my logistic regression analysis. I myself have not much knowledge of...

    Started by Fenomeno‎, 07-03-2014 05:39 PM
    • Replies: 0
    • Views: 136
    07-03-2014, 05:39 PM Go to last post
  47. Predicting sales with customer types

    Hi All, I've been given some data on the number of households of each type in a postal area and the sales figure for that postal area. e.g....

    Started by hasty82‎, 07-03-2014 05:45 AM
    • Replies: 0
    • Views: 89
    07-03-2014, 05:45 AM Go to last post
  48. what is a midpoint?

    Hello, I am learning logistic regression using the book Applied logistic regression by Hosmer and Lemeshow (2000). On page 107, there is a table...

    Started by t.wang21@yahoo.com.au‎, 07-02-2014 08:35 PM
    • Replies: 4
    • Views: 120
    07-02-2014, 09:25 PM Go to last post
  49. Interaction terms in regression-theory

    I am learning categorical variables and interaction terms in the regression course and there few things I don't understand. Suppose a salary...

    Started by Clarkson‎, 07-01-2014 09:30 PM
    categorical data, interaction terms, regression analysis
    • Replies: 1
    • Views: 151
    07-02-2014, 01:37 PM Go to last post
  50. categorical variables in regression analysis and interaction terms

    I am learning multiple regression with categorical variables and in a book I came across this problem. For yield of corn suppose there are two...

    Started by Clarkson‎, 07-02-2014 05:32 AM
    categorical data, interaction term, regression analysis
    • Replies: 1
    • Views: 107
    07-02-2014, 01:33 PM Go to last post
  51. Predictions after mean-centred regression

    Hi, I wonder if anyone can help me with a problem I'm having. I just performed an ordinary (LS) regression in which both the dependent and...

    Started by CharlieMurphy‎, 07-02-2014 06:03 AM
    centering variables, least squares, log linear
    • Replies: 1
    • Views: 107
    07-02-2014, 01:18 PM Go to last post
  52. Dgrees of freedom of error sum of squares

    For a given metal a experiment was carried out to measure the heat variation with temperature in Celsius.The heat was measured twice at each chosen...

    Started by Clarkson‎, 07-02-2014 05:39 AM
    anova, degrees of feedom, regression analysis
    • Replies: 2
    • Views: 99
    07-02-2014, 05:46 AM Go to last post
  53. Interpretation lagged probit model

    Hi there, First of all I''m not sure if this should be posted here or under the statistical software topics but anyway... I have two time-series,...

    Started by Mkkl‎, 06-26-2014 12:17 PM
    probit interpretation
    • Replies: 0
    • Views: 150
    06-26-2014, 12:17 PM Go to last post
  54. Question Unorthodox Calibration Technique

    Hi All, Here is the background to my situation. I have a product that is chips of plastic, ranging from 12mm to 0mm, average size about 4mm. I...

    Started by Paul Marshall‎, 06-25-2014 02:46 PM
    • Replies: 1
    • Views: 234
    06-25-2014, 03:32 PM Go to last post
  55. Model with discrete variables like step function

    I have some data and I want to use a model such as linear regression to describe the relationship between y and x. 2001 2002 2003 2004 2005...

    Started by pepsico007‎, 06-23-2014 10:23 AM
    dummy variable, model, regression, step function
    • Replies: 1
    • Views: 191
    06-23-2014, 11:10 AM Go to last post
  56. Dfbeta for categorical/dummy variables

    Hello :) In my regression analysis (in Stata), I'm generating dfbetas. Can we take into account dfbeta of categorical or dummy variables higher...

    Started by cquetstr‎, 06-23-2014 08:43 AM
    categorical variables, dfbeta
    • Replies: 0
    • Views: 127
    06-23-2014, 08:43 AM Go to last post
  57. OLS assumptions

    Dear all, I would like to ask a question concerning two OLS assumptions - a) dependence of observations b) correlation between residuals and...

    Started by purifyz‎, 06-13-2014 08:15 PM
    • Replies: 5
    • Views: 313
    06-22-2014, 05:31 PM Go to last post
  58. Multiple Linear Regression

    I was given an assignment to fill in the blanks (shown as ?s here) for a multiple linear regression problem. I can get MS error and SS error easily....

    Started by Magyar‎, 06-21-2014 05:56 PM
    • Replies: 4
    • Views: 267
    06-22-2014, 03:04 PM Go to last post
  59. multicollinearity

    Hello, I understand that multicollinearity is different from variable interactions. What I don't understand is whether an interaction of two...

    Started by nooffensebut‎, 06-22-2014 10:33 AM
    interaction effects, multicollinearity
    • Replies: 0
    • Views: 145
    06-22-2014, 10:33 AM Go to last post
  60. Determine if a quadratic regression is appropriate for the data?

    How does one determine if a quadratic regression is appropriate for the data? I am using the programming language R. I have data that I would like to...

    Started by danielh‎, 06-21-2014 08:28 PM
    • Replies: 1
    • Views: 181
    06-22-2014, 01:12 AM Go to last post

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