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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 1,396
    07-16-2014, 10:10 AM Go to last post
  2. 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: 1,342
    07-16-2014, 07:50 AM Go to last post
  3. 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: 2,474
    07-15-2014, 06:35 PM Go to last post
  4. 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: 1,068
    07-15-2014, 06:27 PM Go to last post
  5. 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: 1,299
    07-15-2014, 01:39 PM Go to last post
  6. 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: 2,507
    07-15-2014, 09:07 AM Go to last post
  7. 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: 2,381
    07-15-2014, 07:06 AM Go to last post
  8. 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: 2,013
    07-15-2014, 06:52 AM Go to last post
  9. 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: 995
    07-13-2014, 11:11 AM Go to last post
  10. 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: 1,414
    07-12-2014, 11:33 AM Go to last post
  11. 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: 6,205
    07-12-2014, 06:46 AM Go to last post
  12. 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: 1,664
    07-12-2014, 04:25 AM Go to last post
  13. 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: 1,711
    07-10-2014, 07:28 AM Go to last post
  14. 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: 2,281
    07-08-2014, 10:52 AM Go to last post
  15. 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: 1,103
    07-08-2014, 10:08 AM Go to last post
  16. 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: 1,627
    07-08-2014, 09:41 AM Go to last post
  17. 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: 979
    07-08-2014, 02:46 AM Go to last post
  18. 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
    rate
    • Replies: 0
    • Views: 870
    07-07-2014, 08:07 PM Go to last post
  19. 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: 1,022
    07-07-2014, 03:37 PM Go to last post
  20. 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: 2,790
    07-07-2014, 12:46 PM Go to last post
  21. 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: 1,248
    07-04-2014, 10:36 PM Go to last post
  22. 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: 1,539
    07-04-2014, 03:11 AM Go to last post
  23. 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: 761
    07-03-2014, 09:04 PM Go to last post
  24. 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: 879
    07-03-2014, 05:59 PM Go to last post
  25. 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: 1,332
    07-03-2014, 05:39 PM Go to last post
  26. 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: 1,000
    07-03-2014, 05:45 AM Go to last post
  27. 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: 1,316
    07-02-2014, 09:25 PM Go to last post
  28. 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: 933
    07-02-2014, 01:37 PM Go to last post
  29. 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: 2,440
    07-02-2014, 01:33 PM Go to last post
  30. 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: 1,038
    07-02-2014, 01:18 PM Go to last post
  31. 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: 1,397
    07-02-2014, 05:46 AM Go to last post
  32. 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: 814
    06-26-2014, 12:17 PM Go to last post
  33. 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: 996
    06-25-2014, 03:32 PM Go to last post
  34. 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: 959
    06-23-2014, 11:10 AM Go to last post
  35. 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: 3,260
    06-23-2014, 08:43 AM Go to last post
  36. 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: 2,537
    06-22-2014, 05:31 PM Go to last post
  37. 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: 1,364
    06-22-2014, 03:04 PM Go to last post
  38. 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: 1,049
    06-22-2014, 10:33 AM Go to last post
  39. 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: 1,359
    06-22-2014, 01:12 AM Go to last post
  40. Regression for Financial Applications

    Hi! I'm looking to research the use of regression for financial applications. Say for example to determine the relation between economic...

    Started by quitecool‎, 06-21-2014 08:55 PM
    finance, regression
    • Replies: 0
    • Views: 1,264
    06-21-2014, 08:55 PM Go to last post
  41. Please help

    Dear forum guys! I've got a issue with a simple regression in excel (or maybe it's a Z-test problem, that is what I was told). There is a time...

    Started by Ashot‎, 06-21-2014 02:17 PM
    • Replies: 0
    • Views: 1,363
    06-21-2014, 02:17 PM Go to last post
  42. [Stata - Regression with categorical variables correlated] Multicollinearity

    Hello! I'm currently working on my thesis and I have a problem. I'm doing a regression where many variables are categorical ones (profession,...

    Started by cquetstr‎, 06-20-2014 06:16 AM
    categorical variables, regression, stata 11
    • Replies: 5
    • Views: 3,218
    06-21-2014, 08:25 AM Go to last post
  43. multi level approach

    hi, i have this project to do, but i don't know where to start....Anyone willing to help me ?

    Started by icem3l‎, 06-19-2014 01:09 PM
    • Replies: 5
    • Views: 2,182
    06-19-2014, 03:57 PM Go to last post
  44. ANOVA vs. principal component analysis for nonlinear analysis

    First, let me say that I am not a trained statistician by any means. Here's what I'm working on. I have a dataset with 8 factors (sample attached)....

    Started by huelskbc‎, 06-08-2014 01:49 PM
    • Replies: 2
    • Views: 3,005
    06-19-2014, 12:07 PM Go to last post
  45. MLR equivalent for repeated measures, multiple correlated responses

    I'd like to determine the best approach to determining effect sizes for a set of experimental data with multiple correlated responses. Due to...

    Started by Aorus‎, 06-19-2014 11:05 AM
    effect size, mixed model, multivariate analysis, repeated measures
    • Replies: 0
    • Views: 1,170
    06-19-2014, 11:05 AM Go to last post
  46. Quantile prediction?

    Here is my situation. I am trying to predict the 'entire' distribution of the dependent variable, not just the mean( or conditional mean). Does it...

    Started by Eskinder‎, 06-18-2014 07:37 PM
    mcmc, monte carlo, prediction, probability distribution, uncertainty
    • Replies: 0
    • Views: 1,412
    06-18-2014, 07:37 PM Go to last post
  47. Comparing Coefficients from Different Regression Models

    I'm evaluating two (2) refrigerants (gases) that were used in the same refrigeration system. I have saturated suction temperature (S), condensing...

    Started by gth826a‎, 06-18-2014 09:11 AM
    • Replies: 0
    • Views: 1,346
    06-18-2014, 09:11 AM Go to last post
  48. Creating composit variables

    I have a literature supported construct and I need to join two variables together (one is a count of people <1K and the other is a count of things...

    Started by Jimmy B‎, 06-18-2014 08:06 AM
    • Replies: 0
    • Views: 1,186
    06-18-2014, 08:06 AM Go to last post
  49. Multi Variable Regression

    Hi, I am trying to do multivariable regression analysis on the following data set. Y={ 707208490, 624915399 , 523124515, 386441119} ...

    Started by vaibhavs1985‎, 06-17-2014 10:13 PM
    • Replies: 5
    • Views: 1,848
    06-17-2014, 11:17 PM Go to last post
  50. Lightbulb Dependent variable in regression model - sum of factors?

    I got across below article due to one of our student used it for the brand loyalty measure. ...

    Started by Fairy‎, 06-17-2014 04:37 AM
    • Replies: 1
    • Views: 1,204
    06-17-2014, 05:30 AM Go to last post
  51. Multi level techniques

    Hi, I have an assignment in which I have to study, using multi-level techniques, the impact of sleep deprivation on reaction times and concentration...

    Started by icem3l‎, 06-16-2014 01:51 PM
    anova, liniar regression, multi level
    • Replies: 2
    • Views: 1,301
    06-16-2014, 03:20 PM Go to last post
  52. Question Regression analyses and replicates

    Hi, Thanks in advance for any insight!

    Started by gi86‎, 06-13-2014 12:00 PM
    experimental design, regression, replicates
    • Replies: 2
    • Views: 1,546
    06-16-2014, 06:52 AM Go to last post
  53. Estimates from a log-linear regression model

    Hello all, I am estimating a economic growth regressions using dynamic panel data. My specification is as folllows: Ln(Y_i,t) = a*Ln(Y_i,t-1)...

    Started by mvanbenthem‎, 06-15-2014 08:18 AM
    dynamic, interpretation, log-linear, panel-data
    • Replies: 0
    • Views: 1,084
    06-15-2014, 08:18 AM Go to last post
  54. Time Series and Seasonally Adjusted Regressors

    Hello, For my current job I'm working with forecasting models. In particular, I'm using ARIMA models with regressor variables. I've noticed that...

    Started by pandoji‎, 06-13-2014 05:21 PM
    • Replies: 0
    • Views: 1,129
    06-13-2014, 05:21 PM Go to last post
  55. 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
  56. Logistic or logit

    Hello! I have a question about which model to use: logit or logistic regression. The independent variables are continuous (age, # of children),...

    Started by Anna91‎, 06-12-2014 05:09 PM
    • Replies: 0
    • Views: 1,107
    06-12-2014, 05:09 PM Go to last post
  57. Coefficients of a Dynamic Panel Data Model for Economic Growth

    Dear all, I am having difficulties with the interpretation of the regression results from estimating a growth regression in a dynamic panel data...

    Started by mvanbenthem‎, 06-05-2014 03:21 AM
    • Replies: 1
    • Views: 2,313
    06-12-2014, 04:23 AM Go to last post
  58. Explanatory variable a function of dependent variable

    Hello, Does anyone know the proper terminology for the problem caused by regressing a dependent variable on a set of explanatory variables that...

    Started by anthony19‎, 06-11-2014 04:36 PM
    model checking
    • Replies: 0
    • Views: 2,204
    06-11-2014, 04:36 PM Go to last post
  59. Two factors, time dependent response

    Hello, I would like to know which statistical test should i apply to test the effects of two factors over a response variable which also depends on...

    Started by jael1506‎, 06-11-2014 02:38 AM
    • Replies: 0
    • Views: 1,089
    06-11-2014, 02:38 AM Go to last post
  60. Logistic regression - default in 3years time

    I am running a logistic regression to estimate a firms probability to default. My data set covers 10 years data (2002-2011)with each firms' annual...

    Started by jeyni‎, 06-09-2014 06:49 AM
    • Replies: 6
    • Views: 1,956
    06-09-2014, 11:41 PM Go to last post

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