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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Binary Logistic SNAFU

    Hello, I'm curious if I have coded my variables incorrectly for an analysis. Here's a brief explanation: Independent variables: X1:...

    Started by biologyjoe‎, 08-03-2013 02:29 PM
    logistic regression, variable selection, wald test
    • Replies: 3
    • Views: 1,019
    08-05-2013, 10:22 AM Go to last post
  2. Interpretation of Cox's Proportional Hazards Output - Variable Selection

    Hi everyone, I understand the basics of Cox's Proportional Hazards modelling, and have run a model I am happy with. I've used the Forward Stepwise...

    Started by biologynerd‎, 06-02-2014 12:28 AM
    • Replies: 0
    • Views: 1,200
    06-02-2014, 12:28 AM Go to last post
  3. Power analysis and sample size

    Hello all, I've used perused this site numerous times in the past for assistance with statistical issues, but this is my first post. I work with...

    Started by biosci1978‎, 01-19-2016 03:54 PM
    linear regression, power analysis, sample size
    • Replies: 0
    • Views: 992
    01-19-2016, 03:54 PM Go to last post
  4. Fisher r to z transform / significance test for two different values of r^2

    Short version: I have two values of r^2 from Pearson's correlation, one from a control group (.713) and one for an experimental (.527), and I would...

    Started by biosciguy‎, 04-01-2015 01:11 AM
    correlation coefficient, fisher's z-transformed, r language, r-squared
    • Replies: 1
    • Views: 2,393
    04-01-2015, 08:10 AM Go to last post
  5. Step by Step by Step help please?

    Hello all, can anyone help me understand this step by step understanding of linear regression and correlation?

    Started by Biostat212‎, 12-02-2010 04:27 PM
    • Replies: 6
    • Views: 3,955
    12-03-2010, 04:14 AM Go to last post
  6. Help with interactions in regression

    Hi I would really appreciate if anyone could please help me with this. I am doing a regression analysis, looking at the effect of 2 drugs (A or B)...

    Started by Bio_Stat‎, 03-03-2015 07:42 PM
    • Replies: 3
    • Views: 1,533
    03-04-2015, 08:19 AM Go to last post
  7. log-transformation and interaction effects

    If I log-transform either one of my predictor variables or my outcome variable, can that change the significance of any of my interaction terms? ...

    Started by bitethemuffin‎, 11-29-2011 07:51 PM
    • Replies: 0
    • Views: 3,877
    11-29-2011, 07:51 PM Go to last post
  8. Forward selection

    As most of you probably know, forward selection is a method of model selection that involves introducing independent variables into your model one by...

    Started by Bittereinder‎, 09-04-2011 03:42 AM
    • Replies: 1
    • Views: 2,860
    09-04-2011, 04:10 PM Go to last post
  9. Logistic Regression - Equation

    Hi! I run a logistic regression, and i know that it can be written as Pr(y=1)=F(a+b_1*x+b_2*z). With y being the dependent variable, a the...

    Started by bizzzar‎, 01-24-2013 05:39 AM
    fixed-effects, logistic regression, notation, panel
    • Replies: 4
    • Views: 1,987
    01-28-2013, 02:02 AM Go to last post
  10. Fit Gompertz with vector of dependent variables.

    Hi community, Do any of you know where or how I could fit a to a Gompertz? Usually, we just fit some variable vs time to a Gompertz like number...

    Started by bjbreitling‎, 12-03-2012 03:22 PM
    • Replies: 0
    • Views: 1,697
    12-03-2012, 03:22 PM Go to last post
  11. How to model large multivariate dataset

    I have a years worth of data at a manufacturing plant with 20 predictor variables and 8 response variables that I'm interested in. A number of the...

    Started by bjbreitling‎, 11-07-2013 10:42 AM
    multiple regression
    • Replies: 2
    • Views: 1,372
    11-07-2013, 12:46 PM Go to last post
  12. Fixed effects regression and regression towards the mean

    Hi, i use linear fixed effects models to analyze panel data. The dependent variable is a sum score for mental health. Independent variable are...

    Started by Bjoern_Soc‎, 12-05-2013 02:08 AM
    • Replies: 2
    • Views: 1,442
    12-05-2013, 05:15 AM Go to last post
  13. Problems with variables in multiple linear regression model.

    I currently have a dataset I'm looking at for a project. I've been asked to look at 3 variables, svi, gleason, and pgg45 and see how they're...

    Started by blahblahbla80‎, 05-21-2014 11:52 AM
    • Replies: 1
    • Views: 1,267
    05-22-2014, 08:16 AM Go to last post
  14. How to test for and remedy multicollinearity in optimal scaling regression?

    I have a data set containing only categorical variables (both nominal and ordinal in nature). The dependent variable is also ordinal (with 4...

    Started by Blain Waan‎, 08-28-2012 06:22 PM
    multicollinearity, nonlinear regression
    • Replies: 0
    • Views: 2,919
    08-28-2012, 06:22 PM Go to last post
  15. Test for and remedy of multicollinearity in logistic regression with categorical IVs

    I was searching over net how can I test the presence of multicollinearity and what is its remedy in case the IVs are categorical in a logistic...

    Started by Blain Waan‎, 09-06-2012 02:08 PM
    multicollinearity, regresion
    • Replies: 2
    • Views: 4,536
    09-07-2012, 03:22 AM Go to last post
  16. Unhappy Having problems with CATREG for big and small data sets and defining scaling level.

    0 down vote favorite I am facing with an interesting problem here. I have a data set containing mixed nature of independent variables (some are...

    Started by Blain Waan‎, 09-19-2012 08:00 AM
    • Replies: 0
    • Views: 1,750
    09-19-2012, 08:00 AM Go to last post
  17. Regression with some associated ordinal dependent variables

    I have some associated categorical dependent variables that are ordinal in nature (with 4 or 5 categories). If I want to see the effect of a set of...

    Started by Blain Waan‎, 04-23-2013 02:08 PM
    gee, multivariate regression, spss
    • Replies: 0
    • Views: 1,055
    04-23-2013, 02:08 PM Go to last post
  18. How to analyze data with more than one associated categorical dependent variables?

    I have some dependent variables related to the growth of a company having categories like (e.g. for variables indicating net profit, financial...

    Started by Blain Waan‎, 04-25-2013 10:17 PM
    gee, multivariate analysis, multivariate logistic reg, multivariate regression
    • Replies: 4
    • Views: 2,323
    04-26-2013, 10:56 AM Go to last post
  19. Interpretation of the regression coefficient of a proportion type IV

    If I want to use some proportion type independent variables in a logistic regression, then what will be the interpretation of the regression...

    Started by Blain Waan‎, 01-11-2013 02:42 AM
    regression coefficient
    • Replies: 1
    • Views: 3,197
    01-11-2013, 06:25 AM Go to last post
  20. A regression problem with optional treatment

    I have an interesting problem here and really need your suggestion to analyze the data in a proper way. In 2012 we collected data about retention...

    Started by Blain Waan‎, 11-01-2013 03:48 AM
    hypothesis testing, logistic regression
    • Replies: 0
    • Views: 1,425
    11-01-2013, 03:48 AM Go to last post
  21. Analysis of a longitudinal study where interventions are received at different times

    I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

    Started by Blain Waan‎, 10-20-2014 02:08 PM
    longitudinal study, regression analysis, repeated measures
    • Replies: 2
    • Views: 1,557
    10-23-2014, 04:56 AM Go to last post
  22. Comparing independent variables in a regression

    Hi, I have performed a multiple regression (in SPSS). This is fine, and I've got significant coefficients which tell me their influence on the...

    Started by blastStu‎, 07-10-2010 02:43 AM
    • Replies: 0
    • Views: 2,823
    07-10-2010, 02:43 AM Go to last post
  23. Constant Variable

    Hi folks, I was wondering if you could help me understand a problem I have with a regression. Basically, SPSS excludes one of my variables...

    Started by blastStu‎, 09-13-2010 03:58 AM
    • Replies: 2
    • Views: 17,600
    09-13-2010, 12:38 PM Go to last post
  24. Participant ID - Categorical?

    Hi all, I'm performing a Binary Logistic Regression on data from human subjects. I want to ensure that the effect of independent variables is...

    Started by blastStu‎, 09-13-2010 09:44 AM
    • Replies: 0
    • Views: 3,991
    09-13-2010, 09:44 AM Go to last post
  25. Regression and Monte Carlo Randomisation

    Hi all, I'm currently working with some data in which there are 33 groups of 3 people, with roughly 100,000 datapoints per group. There are two...

    Started by blastStu‎, 12-22-2010 04:08 AM
    • Replies: 1
    • Views: 2,547
    01-02-2011, 06:56 AM Go to last post
  26. Factor in binary logistic regression?

    Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

    Started by blastStu‎, 04-10-2011 06:07 AM
    • Replies: 1
    • Views: 3,249
    04-13-2011, 02:47 AM Go to last post
  27. is this model misspecified

    i'm doing a regression on size of company (x) to explain revenue multiple (y). i'm using the companies' revenues and divide them into 5 groups...

    Started by ble21ach‎, 03-23-2011 11:20 PM
    • Replies: 3
    • Views: 2,722
    03-25-2011, 11:12 PM Go to last post
  28. Good Tool to generate probability of a sale for 300,000 products

    Hi - I am trying to determine a good tool that will help me generate a probability of a sale for a list of of 300,000 products. I have a table of...

    Started by BlendRed3‎, 03-06-2016 01:37 PM
    • Replies: 0
    • Views: 845
    03-06-2016, 01:37 PM Go to last post
  29. Dichotomized predictor with dichotomized response

    I have a dichotomized predictor which can be 0 or 1 and it predicts correctly roughly 80% of the time if a patient is cured 1 or not 0. I tried...

    Started by blogzter‎, 01-28-2013 01:39 PM
    • Replies: 4
    • Views: 1,865
    01-29-2013, 12:50 PM Go to last post
  30. Assumption of Linearity not fulfilled - what to do?

    Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

    Started by bluemuly‎, 09-17-2014 06:02 AM
    • Replies: 1
    • Views: 3,414
    09-17-2014, 02:53 PM Go to last post
  31. Linear Regression

    Hi, I have a dataset which contains a long list of variables (categorical eg. gender, zipcode group etc and continuous eg. income, home value etc)...

    Started by blueycool‎, 12-01-2009 11:19 AM
    • Replies: 0
    • Views: 2,049
    12-01-2009, 11:19 AM Go to last post
  32. Fixed Effects or Random Effects for finding determinants of expenditure

    Hi! I am doing a paper on the determinants of healthcare expenditure for the elderly. I have panel data for income and expenditure for a period of 10...

    Started by BNB‎, 12-10-2012 12:41 PM
    • Replies: 2
    • Views: 1,185
    02-06-2013, 05:59 AM Go to last post
  33. Is it a sensible practice to collapse categories of a predictor?

    I used logistic regression to run a model. An explanatory variable called 'region' has 3 levels (1, 2, 3). Level 3 is the reference group. The...

    Started by bncoxuk‎, 09-06-2011 07:24 PM
    • Replies: 2
    • Views: 3,348
    09-07-2011, 10:07 AM Go to last post
  34. Question Generate model from known independent & dependent variables. Does this make sense?

    I am on a new job as a statistician, after studying stats some years ago. So please bear with me as I seek a solution to my problem. I'm trying...

    Started by bnew‎, 12-10-2014 04:52 PM
    known variables
    • Replies: 4
    • Views: 2,400
    12-15-2014, 05:56 PM Go to last post
  35. Exclamation Please Help! Don't know which model to use

    Hello, I'm not sure which model to use, I'm guessing it is some type of regression. If you could help, I'd greatly appreciate it! The problem...

    Started by bobart261‎, 03-16-2011 10:36 PM
    likelihood, probability, regression
    • Replies: 2
    • Views: 2,418
    03-25-2011, 11:07 AM Go to last post
  36. Regression / modelling help

    Hi All, I'm new here so If I've posted this in the wrong place or its not practical then I apologise. I'm new to regression so helpfully Im...

    Started by bobastic‎, 01-14-2015 05:44 PM
    • Replies: 5
    • Views: 2,421
    02-15-2015, 08:45 PM Go to last post
  37. Regression help needed

    Hi members, Is there anyone who would be willing to give me 5 hours during the day sometime of some regression / modelling help. Im happy to pay...

    Started by bobastic‎, 01-28-2015 07:03 AM
    • Replies: 0
    • Views: 1,222
    01-28-2015, 07:03 AM Go to last post
  38. Poisson regression with interactions

    I am investigating the risk of getting different forms of leukemia if you live near a hazardous waste site in New York state. I am working with PROC...

    Started by bobban‎, 05-05-2009 04:53 PM
    • Replies: 0
    • Views: 3,877
    05-05-2009, 04:53 PM Go to last post
  39. Regression Analysis and Residual analysis from Minitab output

    The questions are on Regression and Analysis and Residuals. I need some explaining oh how to find and answer these questions just from a minitab...

    Started by bobbycontinelli‎, 04-07-2015 10:57 AM
    • Replies: 0
    • Views: 1,643
    04-07-2015, 10:57 AM Go to last post
  40. Exclamation Coefficients and standard deviations

    Hi, I have seen in a paper that the author states that the coefficient he gets in a regression implies that an increase of one standard deviation...

    Started by bobesp‎, 07-02-2008 03:52 PM
    • Replies: 2
    • Views: 10,877
    07-05-2008, 04:58 PM Go to last post
  41. can you help me interpret this?

    Vitamin D varies with season, below is a method of de-seasonalising vit D from literature. I'm not too sure what they've done after regressing the...

    Started by bobmcpop‎, 12-30-2013 06:50 AM
    • Replies: 4
    • Views: 1,691
    01-04-2014, 10:50 AM Go to last post
  42. 2sls regression

    hi, what be the consequenses of using the same explanatory variables in a simultaneous equations system? for example if both the supply and the...

    Started by bodesmiller‎, 02-15-2015 11:51 AM
    • Replies: 0
    • Views: 1,353
    02-15-2015, 11:51 AM Go to last post
  43. unit price of total pris?

    Hi, I am a first year economic student and are having some fun with regressions. I am doing a a regression analyse of some example data I have...

    Started by bodesmiller‎, 03-05-2015 05:05 AM
    • Replies: 0
    • Views: 1,563
    03-05-2015, 05:05 AM Go to last post
  44. coefficient variance decomposition test for multicollinearity

    good day, please assist me in interpreting the results of the coefficient variance decomposition test. i am a bit confused; i think the condition...

    Started by Boi‎, 04-03-2016 01:16 PM
    • Replies: 0
    • Views: 2,617
    04-03-2016, 01:16 PM Go to last post
  45. how to improve Arellano-Bond test for AR(2) in first differences in system GMM?

    Hello, I am estimating my regression using system GMM. xtabond2 y L.y x1 x2 x3 yr2004-yr2011 z, gmm(y, lag(2 .) ) iv(x3 yr2004-yr2011,...

    Started by boldmiga‎, 02-13-2014 10:38 AM
    arellano-bond test, gmm, system gmm, xtabond2
    • Replies: 1
    • Views: 6,689
    02-13-2014, 11:18 AM Go to last post
  46. comparing regression coefficients among many groups

    Hi all, first of all, sorry for my poor English since I'm not native English speaker, I have this simple OLS regression equation model with one...

    Started by bomool‎, 09-23-2013 05:09 AM
    compare coeff / groups
    • Replies: 2
    • Views: 2,125
    10-08-2013, 06:05 AM Go to last post
  47. How do i disprove a trend?

    Hi there, I have collected some data (points) over the last twenty years of 50,000+ people who have broken their hips. Their ages (mean and SDs)...

    Started by bonedoctor‎, 05-31-2011 06:35 PM
    • Replies: 6
    • Views: 2,866
    06-03-2011, 11:40 AM Go to last post
  48. Logistic regression : negative coefficients, categorical variables

    Hi I am trying to build attrition model and have these variables :- 10 categorical variables with sub levels which created into dummy variables and...

    Started by Boo‎, 04-22-2017 06:05 AM
    coefficient, logistic regression
    • Replies: 3
    • Views: 775
    04-22-2017, 09:55 AM Go to last post
  49. Multiple Regression Help

    Hi, I'm currently working on an assignment in which I have to run a multiple regression, however I am a little confused regarding the order of the...

    Started by boogers‎, 11-12-2009 05:20 PM
    • Replies: 1
    • Views: 2,215
    11-13-2009, 08:02 AM Go to last post
  50. Multiple regression

    I have two predictors in my model. One is nominal and dichotomous (Male or Female), and is producing a negative β. The other predictor is ordinal and...

    Started by Boon‎, 01-08-2013 11:14 AM
    • Replies: 7
    • Views: 1,413
    01-09-2013, 12:52 PM Go to last post
  51. Calculation of parameter uncertainties when using method of least squares

    Hi everyone, I am struggling with a maybe simple problem. I have a set of data points (x,y) for which I would like to derive a fitting function of...

    Started by bordercollie2‎, 07-29-2016 04:59 AM
    • Replies: 1
    • Views: 2,138
    11-01-2016, 04:41 AM Go to last post
  52. F test and t-test

    Hi guys, I am analyzing some regression results and the p-value for the F-test is large, but at the same time, the t-test for some of the independent...

    Started by boredaxel‎, 10-14-2012 12:20 AM
    • Replies: 2
    • Views: 1,522
    10-15-2012, 09:03 AM Go to last post
  53. Help with easy stats

    Hi guys I desperately need help revising for my STATS module. We have been given practice exam questions but are not given the answers so I can't...

    Started by borgmeister‎, 04-01-2006 05:52 PM
    • Replies: 0
    • Views: 2,736
    04-01-2006, 05:52 PM Go to last post
  54. T-Test vs. Welch

    So, I know very little about statistics and hope you could help me. I understand that I should run a t-test when variances are similar. And a...

    Started by botnut‎, 06-28-2012 09:21 AM
    • Replies: 0
    • Views: 2,505
    06-28-2012, 09:21 AM Go to last post
  55. Plotting output from logistic regression???

    I ran a quasi-likelihood logistic regression using S-plus and have a question about how to plot and interpret the results. How can I construct...

    Started by Boxor‎, 09-21-2010 05:35 PM
    • Replies: 0
    • Views: 3,867
    09-21-2010, 05:35 PM Go to last post
  56. Question what is: correlation? regression? confidence?

    I need to learn statistics for a project I'm working on. I am totally lost and am spending more time than I thought I would on trying to understand...

    Started by brad henrie‎, 10-08-2009 08:38 PM
    • Replies: 1
    • Views: 4,776
    10-09-2009, 03:40 AM Go to last post
  57. Dummy variable question in regression

    Hello, I'm trying to understand dummy variables in regression. I'm regressing the price of diamonds against (1) weight (2) Clarity and (3)...

    Started by bradyj2‎, 04-24-2012 01:35 PM
    • Replies: 2
    • Views: 2,093
    04-26-2012, 11:26 AM Go to last post
  58. Creating an indicator variable of a single observation

    Hello, Could somebody explain the rational for creating a dummy variable for a single observation in a regression analysis. Why would you do it? ...

    Started by bradyj2‎, 04-29-2012 06:26 AM
    • Replies: 0
    • Views: 1,900
    04-29-2012, 06:26 AM Go to last post
  59. Interpreting regression output

    Hi there, I have performed a linear regression of the energy consumption of an electric car on 7 measured parameters. They are 1. Max...

    Started by bradyj2‎, 08-06-2012 05:15 AM
    • Replies: 0
    • Views: 1,068
    08-06-2012, 05:15 AM Go to last post
  60. Sample size multiple linear regression

    Hi, Would anybody know of a method or a respectable online calculator for calculating the sample size for a multiple linear regression (being...

    Started by bradyj2‎, 09-13-2012 04:27 AM
    • Replies: 1
    • Views: 1,680
    09-15-2012, 11:30 PM Go to last post

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