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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 2,940
    07-25-2014, 08:49 AM Go to last post
  2. 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 07:36 AM
    interpreting results, logistic regression, significance
    • Replies: 7
    • Views: 1,512
    07-29-2014, 06:12 PM Go to last post
  3. Standard Error of Estimate

    I am reading a book called Applied Statistics with Excel by G. Keller. On p593 he wrote Standard Error of Estimate=(SSE/n-k-1)^2, and SSE = sum...

    Started by yma16‎, 08-09-2014 11:45 PM
    • Replies: 7
    • Views: 1,976
    08-10-2014, 08:42 AM Go to last post
  4. Regression when IV are part of DV

    I have a DV that is made up of 7 IV. If you combine the IV you get the DV. I want to know the relative impact of each of the IV on the DV (relative...

    Started by noetsi‎, 10-09-2014 11:29 AM
    • Replies: 7
    • Views: 2,086
    10-10-2014, 01:02 PM Go to last post
  5. Why does the coefficient change sign when another variable is added to the OLS model?

    Dear all, I am trying to run an OLS regression in Stata 13, with log of per capita calorie as my dependent variable and age and years of education...

    Started by monzur‎, 12-19-2014 03:53 PM
    • Replies: 7
    • Views: 5,702
    12-19-2014, 04:27 PM Go to last post
  6. Dealing with outliers

    We have this discussion from time to time, but it has become more pertinant to me now... Before I begin I should note that I am not really interested...

    Started by noetsi‎, 12-30-2014 10:09 AM
    • Replies: 7
    • Views: 3,507
    12-30-2014, 10:16 PM Go to last post
  7. Interpret continuous variables in binary regression model

    I have produced three binary regression models, each showing the odds ratios (ORs) for an outcome (attendance versus non-attendance) Each...

    Started by jle‎, 04-26-2015 09:38 PM
    • Replies: 7
    • Views: 1,585
    04-28-2015, 01:58 AM Go to last post
  8. Independent Variables and Dependent Variable Regression Analysis

    I came across this question which best explain what a need in one of the forum, however it was not answered. Please assist based on the scenario...

    Started by Mosima‎, 05-12-2015 02:39 PM
    • Replies: 7
    • Views: 1,649
    05-14-2015, 01:55 AM Go to last post
  9. What is the proper name for such kind of regression models - 2-stage or 2-step?

    Dear community experts, I've faced an interesting situation, which is out of my area of expertise, so I need an advice here from someone more...

    Started by DikAlex777‎, 06-24-2015 10:26 AM
    instrumental variables, logit, two-step estimation
    • Replies: 7
    • Views: 1,437
    06-24-2015, 04:21 PM Go to last post
  10. Concerns with using a mix of Continuous and Categorical IVs in Logistic Regression?

    Before I get into it, I want to make clear that I'm not a statistics guy. I'm doing what I can to get through a thesis and stumbling my way forward....

    Started by OkieSpladle‎, 07-22-2015 12:33 PM
    • Replies: 7
    • Views: 1,493
    07-23-2015, 12:30 PM Go to last post
  11. Logistic Regression: how can I handle IVs which are correlated?

    Hello, I am planning to fit a Logistic Regression model (binary) and I would like to use (among several IVs) 4 predictors that turn out to suffer of...

    Started by gianmarco‎, 07-24-2015 02:19 AM
    • Replies: 7
    • Views: 1,567
    07-24-2015, 09:26 AM Go to last post
  12. Relationship between 2 variables & 1 dependant

    Hi all, My wife is busy with an assignment that is even giving me grey hair. She needs to determine the relationships between 2 variables and 1...

    Started by kiepie‎, 07-28-2015 12:40 PM
    • Replies: 7
    • Views: 1,487
    07-30-2015, 07:45 AM Go to last post
  13. Logistic Regression: collinearity btw continuous and categorical predictors?

    Hi All, I am still working on fitting a binary Logistic Regression model in which the DV is land 'optimal vs. non-optimal quality', and the IVs are...

    Started by gianmarco‎, 08-12-2015 05:22 AM
    • Replies: 7
    • Views: 1,872
    08-12-2015, 07:21 AM Go to last post
  14. how to calculate co-efficients

    Hi all, This is my first post on this forum. Lets say I have, x vectors (-0.0028, 5.0028, 10.0085, 15.0085, 20.0028) y vectors (0, 5, 10, 15,...

    Started by hemnath‎, 09-25-2015 05:48 AM
    • Replies: 7
    • Views: 2,761
    09-30-2015, 10:10 PM Go to last post
  15. Linear, step wise regression vs binary logistic regression - which method to choose

    Dear friends I have a dilemma about choosing a right logistical method. i want to find predictor factors of life satisfaction and have 5...

    Started by badibad‎, 09-28-2015 05:33 PM
    • Replies: 7
    • Views: 1,786
    09-29-2015, 07:46 AM Go to last post
  16. SE of Reference category in Multinomial Logit Model

    I used R to fit a Multinomial Logit model to my data. The data includes some categorical variables as effect coded variables. For example, one...

    Started by Hendrik6‎, 10-14-2015 12:29 PM
    effect coding, multinomial logit, reference category, standard error
    • Replies: 7
    • Views: 2,228
    10-15-2015, 09:55 AM Go to last post
  17. Lightbulb Multiple Regression to receive cost for a single item of an order

    Hi everybody, I appreciate any kind of help and tips: Problem: - I have a dataset with 1600 orders - For each of these orders I know the...

    Started by christoph_b‎, 02-03-2016 05:02 PM
    • Replies: 7
    • Views: 2,219
    02-15-2016, 04:29 AM Go to last post
  18. Unhappy Help with Interactaction Assesment

    Hello! Can anyone explain why my Breslow-Day test for interaction was significant (p=0.0005) but my forward selection logistic regression test for...

    Started by Naxaris‎, 02-15-2016 07:58 PM
    • Replies: 7
    • Views: 1,738
    02-16-2016, 09:19 AM Go to last post
  19. Problem with residual?

    I don't know if this is an issue or not. There are the strange bars on the top and bottom of the residuals - I have never seen anything like this and...

    Started by noetsi‎, 03-29-2016 10:53 AM
    • Replies: 7
    • Views: 1,719
    03-29-2016, 12:47 PM Go to last post
  20. Is correction for attenuation in my regression analysis necessary?

    Hi everyone, I'd like to know if I should consider a correction for attenuation in a multiple regression I'd like to run on my data. Here's...

    Started by majortom88‎, 04-11-2016 01:53 PM
    • Replies: 7
    • Views: 2,056
    04-15-2016, 04:39 AM Go to last post
  21. Minimum number of cases for the reference level

    Before I ask this I have the true population so I am not sure this issue even applies :p Is there a minimum number of cases the reference level...

    Started by noetsi‎, 04-25-2016 01:22 PM
    • Replies: 7
    • Views: 1,514
    04-26-2016, 03:59 PM Go to last post
  22. Combining Two Samples (one w/ intervention and one w/ out intervention)

    I have a local dataset with a continuous predictor and binary outcome. I will use logistic regression to predict the binary outcome with the...

    Started by hlsmith‎, 05-02-2016 03:50 PM
    • Replies: 7
    • Views: 1,655
    05-02-2016, 10:01 PM Go to last post
  23. Variable transformation in OLS regression

    Hi there, I have a question related to the transformation of independent variables in an OLS regression. More specifically: When I transform...

    Started by Tux‎, 06-14-2016 10:08 PM
    • Replies: 7
    • Views: 4,373
    06-20-2016, 06:48 PM Go to last post
  24. interpreting interaction terms

    Hello, I hope that someone may be able to provide some help in my research. I have a 3-way interaction gender (male 0, female 1) by black (black...

    Started by derekcruise‎, 07-17-2016 01:25 PM
    • Replies: 7
    • Views: 1,465
    07-19-2016, 07:18 AM Go to last post
  25. Regression MC

    Can someone confirm the answers to the below? And advise which ones are incorrect. Thanks! 1) True/False: Models selected by automated variable...

    Started by shane414‎, 04-23-2017 08:18 PM
    • Replies: 7
    • Views: 1,365
    04-25-2017, 09:27 AM Go to last post
  26. Minimisation of specific residuals

    Hello, I hope that I can finde someone here to help me with the following problem: I have 11 points with x and y values. Those points are...

    Started by humic‎, 02-08-2017 07:49 AM
    • Replies: 7
    • Views: 2,589
    02-20-2017, 04:43 AM Go to last post
  27. Heteroskedasticity

    I found heteroskedasticity in my data and I took the log for my dependent variable in SPSS. My independent variables are dummies). To be sure I...

    Started by Jazz3‎, 03-24-2017 12:30 PM
    • Replies: 7
    • Views: 1,187
    03-26-2017, 06:47 AM Go to last post
  28. What do you do it you can't increase X by one level while holding all other X constan

    Classical regression defines the slope as the change in Y for a one unit change in X holding all other X constant (or so I believe). :p What happens...

    Started by noetsi‎, 03-22-2017 12:36 PM
    • Replies: 7
    • Views: 900
    03-22-2017, 06:19 PM Go to last post
  29. Beta Regression Coefficients

    In a simple model, x is a continuous (normally distributed) variable predicting y. Since y values are proportions ranging from 0 to 1 (0%-100%),...

    Started by Martin Marko‎, 03-05-2017 08:16 AM
    beta-regression, logit
    • Replies: 7
    • Views: 1,534
    03-06-2017, 11:44 AM Go to last post
  30. beta coefficient for a logistic regression

    I consider a simple model with binary variable Y (diseased vs non-diseased), variable X normally distributed among diseased and non-diseased with...

    Started by Alex C‎, 03-01-2017 09:57 AM
    • Replies: 7
    • Views: 1,570
    03-01-2017, 04:57 PM Go to last post
  31. regression analysis for very small sample?

    hello, my study is about "The impact of corporate governance on firm performance". my sample size is 5 compagnies i have 6 IV and 1 DV so my Q...

    Started by ilyes‎, 02-20-2017 01:52 PM
    alternative, regerssion analysis, sample size
    • Replies: 7
    • Views: 2,196
    02-21-2017, 04:32 PM Go to last post
  32. When the Outcome and Predictor Variables are (sort of) the same

    Hello, everyone, I am working on a study with sensitive information, so it may suffice only to look at the last two paragraphs for my question,...

    Started by w_scheidel‎, 05-12-2017 10:33 AM
    • Replies: 7
    • Views: 978
    05-12-2017, 07:11 PM Go to last post
  33. need help with regression problem asap!

    I have to do this problem but I have no idea how to interpret the data! Can somebody pleeeeeeeeeease help me?:wave: An object is thrown upward from...

    Started by pinkmari23‎, 12-06-2005 05:14 PM
    • Replies: 6
    • Views: 3,691
    12-13-2005, 12:26 PM Go to last post
  34. generalized least squares

    Hello. How can I modify least square linear regression method in order to fit a straight line to data with non gaussian error (such as Levy, Poisson...

    Started by skan‎, 07-29-2007 01:21 PM
    • Replies: 6
    • Views: 4,099
    08-02-2007, 05:53 AM Go to last post
  35. Regression approach to ANOVA

    I am trying to fit regression for some categorical variables. I have two treatment A(3 levels) and B (2 levels) and their interaction. The output...

    Started by lovedieer‎, 03-03-2008 11:17 PM
    • Replies: 6
    • Views: 4,222
    03-07-2008, 04:10 PM Go to last post
  36. Increasing variance in linear regression

    Hi, I have a response and a predictor variable, weight and height, to which I've fitted a linear regression. The relationship appears to be...

    Started by Statstastic‎, 05-28-2008 10:26 AM
    • Replies: 6
    • Views: 12,569
    05-29-2008, 09:33 AM Go to last post
  37. F-Statistic Question

    I'm sorry for probably asking a foolish question, but my searches have yielded very limited results (as well as my reading) in regards to the...

    Started by dfrisch‎, 05-28-2008 12:30 PM
    • Replies: 6
    • Views: 25,080
    06-23-2008, 03:28 PM Go to last post
  38. Unhappy Very basic questions on some terms.

    I apologize if this is a little too basic for you, but I'm an RN taking statistics ovr the summer and my brain just doesn't work like this. My...

    Started by smarge117‎, 07-12-2008 03:50 PM
    • Replies: 6
    • Views: 2,957
    07-13-2008, 07:25 PM Go to last post
  39. Help with Multiple Regression

    Hi all, im struggling with what to do with this multiple regression question, any help tips or pointers would be greatly appreciated! Am i...

    Started by Mosphaitus‎, 08-15-2008 08:35 AM
    • Replies: 6
    • Views: 3,714
    08-16-2008, 12:43 PM Go to last post
  40. Linear regression

    Hi all I was given a data sample of 35 countries which included the country name,the number of railways and the number of airports in the given...

    Started by gloew‎, 12-19-2008 04:44 AM
    • Replies: 6
    • Views: 3,032
    12-23-2008, 06:09 PM Go to last post
  41. Linear regression analysis - Urgent assistance required

    Hi I am trying to examine the relation between ad. liking and attitude towards the brand. My hypothesis H1: "Commercials that are liked will...

    Started by bulu‎, 10-09-2009 06:14 PM
    • Replies: 6
    • Views: 4,843
    10-11-2009, 04:10 AM Go to last post
  42. Physiology grad student needing some help - linear regression through the origin

    Hi all. I'm a PhD student in physiology, and I seem to be suffering from mild amnesia when it comes to statistics. My old course notes are out of my...

    Started by Pascal‎, 01-04-2010 09:45 AM
    • Replies: 6
    • Views: 4,304
    01-06-2010, 04:43 AM Go to last post
  43. Regression Analysis - positive correlation

    Hi, I am running a regression analysis using data for aircraft values. The problem that I have encountered is that GDP global and Oil Price are...

    Started by Lukaszlukasz007‎, 02-18-2010 05:07 AM
    • Replies: 6
    • Views: 3,685
    02-19-2010, 04:13 AM Go to last post
  44. Question Calculating prediction intervals (error estimates of specific predicted points) in a

    Hi all, this is my first post here so please let me know if I need to provide more details. I want to generate a multivariate logistic regression...

    Started by bernoulli‎, 06-18-2010 03:48 PM
    • Replies: 6
    • Views: 13,962
    06-22-2010, 01:01 AM Go to last post
  45. Correlation

    Hi! I was wondering if someone could give me some help. I am struggeling to understand how to run my correlation analysis using SPSS This is my...

    Started by Kate10‎, 08-16-2010 03:49 PM
    • Replies: 6
    • Views: 2,725
    08-17-2010, 08:44 AM Go to last post
  46. Categorical Count Data and ANOVA

    Hi, I hope this is in the right section. I heard that ANOVA shouldn't be used for analysing categorical count data. If this is the case, can...

    Started by wy38‎, 08-17-2010 10:42 AM
    • Replies: 6
    • Views: 12,465
    08-17-2010, 09:54 PM Go to last post
  47. Question Regression with a categorical moderator (with 3 catoegories)

    Hi All. I am wanting to run a moderating regression. But my moderator has 3 categories(Black, Asian, White). Usually, with a dichotomous...

    Started by sneaks‎, 08-27-2010 06:45 AM
    • Replies: 6
    • Views: 11,312
    08-27-2010, 07:50 AM Go to last post
  48. ANOVA table insignificant in Regression

    Greetings!!! Regression analysis produced ANOVA table insignificant. Please confirm if I should report regression results. Thanks Rayyan

    Started by itsrayyan‎, 09-19-2010 04:51 PM
    • Replies: 6
    • Views: 12,905
    09-23-2010, 04:43 PM Go to last post
  49. 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: 3,946
    12-03-2010, 04:14 AM Go to last post
  50. Coefficient of determination and statistical significance

    Hi, I tried two different models for a regression (both with one predictor). The first one was a linear regression model of the type Y= a + bX...

    Started by val92‎, 02-15-2011 05:24 PM
    • Replies: 6
    • Views: 15,313
    02-16-2011, 01:49 PM Go to last post
  51. Linear regression on bio-data.

    Hi all, I'm completely new to this forum so forgive me (and tell me) if I break protocol in any way. My setup is: I have n animals. I believe...

    Started by Kettle‎, 02-20-2011 06:12 AM
    • Replies: 6
    • Views: 5,042
    02-23-2011, 07:37 PM Go to last post
  52. Many DV's

    Hello, I need help, maybe someone can assist. My data consist signal that comes from a machine (a sensor of a machine). The engineers that...

    Started by NN_STAT‎, 05-29-2011 01:17 PM
    • Replies: 6
    • Views: 2,464
    05-31-2011, 03:13 AM Go to last post
  53. 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: 2,865
    06-03-2011, 11:40 AM Go to last post
  54. Logstic Regression: What's this Graph Mean

    I'm learning logistic regression from reading and asking questions on my own. The following plot is from the predicted values of a logistic...

    Started by trinker‎, 06-10-2011 10:59 PM
    • Replies: 6
    • Views: 2,993
    06-11-2011, 09:01 AM Go to last post
  55. Confusion over how to calculate regression coefficient

    I'm trying to find the regression coefficient of one set of a data on another. There is a linear relationship between the two sets of data. After a...

    Started by paddyg‎, 06-15-2011 04:32 AM
    • Replies: 6
    • Views: 11,247
    06-22-2011, 01:33 PM Go to last post
  56. R squared value and type of regression

    Hi. I am doing regression in Excel between two factors. I am getting r squared value as follows: 0.435 when choosing linear 0.443 when choosing...

    Started by graphicsgriffin‎, 06-22-2011 03:23 PM
    • Replies: 6
    • Views: 7,368
    06-27-2011, 10:46 AM Go to last post
  57. stepwise regression with dummy variables

    Hello there, I want to do a stepwise regression in order to find relevant predicting variables, but one of the possible predicting variables is a...

    Started by gilisegall‎, 07-11-2011 01:51 PM
    • Replies: 6
    • Views: 16,304
    07-12-2011, 09:00 AM Go to last post
  58. Coefficients in linear regression

    hi i am using spss 17.0 i am using linear regression to predict behaviours for the coefficent output does the constant and the indperpentant...

    Started by aarong‎, 07-21-2011 09:15 AM
    • Replies: 6
    • Views: 3,446
    07-21-2011, 03:32 PM Go to last post
  59. Analytical linear regression?

    My lecturer stated that no method exists to determine the line of best fit for a set of data analytically. He went on to state that computers through...

    Started by striphe‎, 08-04-2011 06:32 AM
    • Replies: 6
    • Views: 5,268
    08-05-2011, 06:01 PM Go to last post
  60. Multiple regression analysis: Significant regression model, insignificant predictors

    With regards to the title above, my multiple regression model has a significant F value but none of the predictors are significant. All the...

    Started by Serene‎, 08-19-2011 12:16 AM
    • Replies: 6
    • Views: 12,856
    08-30-2011, 04:51 PM Go to last post

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