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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. normality assumption in regression: THE FINAL ANSWER!!!

    ok, maybe it's not *the* final answer, but here's a theory of where this may be coming from. ever since noetsi started asking this question about...

    Started by spunky‎, 06-27-2013 04:31 AM
    • Replies: 11
    • Views: 3,302
    07-02-2013, 09:48 AM Go to last post
  2. R Squared and dummy variables

    Hey, If you changed your model from one variable to a number of dummy variables, would the R^2 increase considerably, supposing that the dummy...

    Started by mhider‎, 11-01-2015 02:36 PM
    • Replies: 5
    • Views: 3,300
    11-03-2015, 02:11 PM Go to last post
  3. Variance of error

    With the equation yi = B0 + B1xi + ei Does anyone know what the variance of ei_hat is suppose to equal? So far I have tried to split it the ei...

    Started by Cookie‎, 08-08-2011 01:15 AM
    • Replies: 0
    • Views: 3,299
    08-08-2011, 01:15 AM Go to last post
  4. Linear Model Prediction

    I'm working on a linear model that looks like: Price = B0 + B1(Gender) + B2(Age) + B3(Credit Type) + B4(Home) ... The predictior is price, and...

    Started by amathew‎, 12-20-2011 05:56 PM
    • Replies: 13
    • Views: 3,298
    12-21-2011, 11:06 AM Go to last post
  5. Statistical Significance

    I am completing a statistics project having been given data for 30 years. I have calculated the pairwise correlation coefficients between Infant...

    Started by shanny9‎, 01-04-2009 07:22 AM
    • Replies: 2
    • Views: 3,294
    01-04-2009, 03:42 PM Go to last post
  6. compare Spearman's correlations

    Dear all, I performed several Spearman's correlation tests between the same independent variable and different dependent ones. All the...

    Started by marco77‎, 12-05-2011 10:29 AM
    • Replies: 2
    • Views: 3,293
    12-06-2011, 05:07 AM Go to last post
  7. regression with ranked values

    I have a problem I want to make a regression analyse with a few independent variables and 1 dependent variable. The data is all ranked. The...

    Started by ognuno‎, 07-10-2010 05:01 AM
    • Replies: 0
    • Views: 3,290
    07-10-2010, 05:01 AM Go to last post
  8. multiple comparisons

    Hi, I'm a vet doing a research project, but am not really strong in stats. I have a question about whether correction for multiple comparisons is...

    Started by jknuppel‎, 02-09-2009 09:13 PM
    • Replies: 8
    • Views: 3,288
    02-13-2009, 02:12 AM Go to last post
  9. regression with categorical predictor

    Hi people, i have a problem which i could not solve myself, maybe somebody can help me. i have three groups (A/A, A/B and B/B) and a continuous...

    Started by muraveinik‎, 04-11-2011 01:14 PM
    • Replies: 1
    • Views: 3,288
    04-17-2011, 12:02 AM Go to last post
  10. Least Squares

    Delete. Unhelpful responses.

    Started by Dave Brunner‎, 09-08-2015 08:20 PM
    • Replies: 8
    • Views: 3,287
    09-09-2015, 06:21 PM Go to last post
  11. logistic regression with quartiles

    hi all i have some data that i need to divide into quartiles. after i do this, i will have a predictor variable with 4 categories. i need to do...

    Started by nemo‎, 09-28-2011 06:19 PM
    • Replies: 0
    • Views: 3,285
    09-28-2011, 06:19 PM Go to last post
  12. Restricted cubic splines with dichotomous outcome

    Do anyone know if it's possible to perform a regression using restricted cubic splies with a dichotomous outcome?

    Started by mikkelbrabrand‎, 07-03-2012 07:15 AM
    • Replies: 1
    • Views: 3,284
    07-03-2012, 09:57 AM Go to last post
  13. Regression interpretation

    Hey guys, I'm doing an OLS regression with an ending balance (econometrics class) as my dependent variable and the S&P 500 (among others) as my...

    Started by sfspitfire23‎, 07-22-2011 01:14 PM
    • Replies: 0
    • Views: 3,283
    07-22-2011, 01:14 PM Go to last post
  14. Discretization of a continuous variable

    He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

    Started by XPeriment‎, 03-26-2015 06:05 AM
    • Replies: 14
    • Views: 3,282
    03-28-2015, 09:53 AM Go to last post
  15. Mixed model with invariant dependent variable?

    First off, full disclosure. I am an engineer by trade. I have some grad-level statistics under my belt, which means I know enough to be dangerous....

    Started by shamrock‎, 01-11-2012 11:07 PM
    • Replies: 12
    • Views: 3,280
    01-19-2012, 10:06 AM Go to last post
  16. 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: 3,277
    06-23-2014, 08:43 AM Go to last post
  17. Graphical representation and functions of non parametric confidence intervals

    I calculated the 95% confidence intervals for alpha and beta coefficients through non parametric bootstrapping (10000 iterations). Now, I'd like to...

    Started by Oritteropus‎, 01-12-2012 05:18 AM
    • Replies: 2
    • Views: 3,275
    01-15-2012, 07:05 AM Go to last post
  18. ARMA Model Output & Excel

    Dear All, I am using my Eviews Output of an ARMA Model, taking the coefficients in other to perform my Forecasts in Excel. However, I am not being...

    Started by joaom‎, 04-18-2014 12:51 PM
    • Replies: 1
    • Views: 3,270
    04-19-2014, 07:41 AM Go to last post
  19. Relative impact of an X on Y.

    This is probably the most important question I get asked to do, and I have never found a great answer for it (of course there may not be one). If you...

    Started by noetsi‎, 03-13-2017 10:33 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,267
    03-14-2017, 03:32 PM Go to last post
  20. using variance matrix

    If you have a vector Q = , where Qi is a random variable, and a variance matrix var(Q) = how do you find the variance for Q1,Q2? Is there a...

    Started by matlabber‎, 01-16-2012 05:16 PM
    var stats
    • Replies: 4
    • Views: 3,265
    01-16-2012, 07:36 PM Go to last post
  21. Repeated measures question

    Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

    Started by LEMONIAS‎, 11-20-2016 06:56 PM
    • Replies: 6
    • Views: 3,265
    05-31-2017, 04:14 AM Go to last post
  22. Comparison of linear and power law regression models

    I'm quite a newb at statistics, with only one college-level statistics course behind me. I apologize in advance if my terminology and/or...

    Started by eis‎, 07-20-2011 01:43 PM
    comparison, geomorphology, linear, power law
    • Replies: 0
    • Views: 3,264
    07-20-2011, 01:43 PM Go to last post
  23. Regression of probability distributions

    I have an dataset where the y values are multiple points representing a probability distribution rather than a single discrete point. I'm trying to...

    Started by JeffTheGreen‎, 10-06-2010 05:32 PM
    • Replies: 5
    • Views: 3,263
    10-12-2010, 04:45 AM Go to last post
  24. 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: 3,260
    04-13-2011, 02:47 AM Go to last post
  25. Assumptions of Quantile Regression

    Is equal variance an assumption of quantile regression? Does quantile or median regression have any assumptions? Thanks.

    Started by zeloc‎, 12-11-2011 02:23 PM
    • Replies: 1
    • Views: 3,257
    12-12-2011, 02:07 AM Go to last post
  26. which model to use?

    I have a dependent variable that is limited and discrete (it goes from -9 to 9 in whole numbers), yet the residuals produced from a linear regression...

    Started by danjohnson10‎, 07-12-2011 04:46 PM
    • Replies: 10
    • Views: 3,256
    08-03-2011, 01:34 PM Go to last post
  27. Help creating my first logistic Regression model

    Hi everyone, I`m new here, and new in the stats world, and i have several questions and need for help on how to proceed. First, what i`m doing...

    Started by Perdido‎, 07-06-2015 09:29 AM
    • Replies: 8
    • Views: 3,255
    07-06-2015, 03:21 PM Go to last post
  28. Linear Regression Models (3)

    β ε note: also under discussion in "Math Help Forum"

    Started by kingwinner‎, 05-14-2009 04:43 AM
    • Replies: 4
    • Views: 3,251
    05-19-2009, 08:03 PM Go to last post
  29. multiple regression analysis

    Hi There, I am conducting multiple regression analyses using SPSS. I have an outcome variable and several potential predictors, one of which is...

    Started by katypips‎, 02-02-2010 05:56 AM
    • Replies: 0
    • Views: 3,251
    02-02-2010, 05:56 AM Go to last post
  30. Regression table interpretation problem

    Hello all, I am a complete beginner in statistics but I have come across a table I need to interpret for my research. Although it's probably a...

    Started by Nebounette‎, 02-28-2012 04:54 PM
    • Replies: 8
    • Views: 3,247
    02-29-2012, 09:58 AM Go to last post
  31. Relative impact

    I circle back to this question every few years, it is becoming critical these days and my readings have not turned up a strong consensus on this...

    Started by noetsi‎, 06-20-2016 05:30 PM
    • Replies: 9
    • Views: 3,247
    06-27-2016, 11:02 AM Go to last post
  32. How to estimate change effects through time using R?

    Hi I am using project R and I have two sets of datas: 1. House prices, house info (eg. sqft, rooms, lot sizes, etc), area codes, and school...

    Started by bruzzo‎, 12-05-2010 01:55 PM
    • Replies: 1
    • Views: 3,246
    12-05-2010, 06:45 PM Go to last post
  33. Multiple Regression Question

    This is my data: Bars

    Started by student865‎, 11-10-2011 09:54 AM
    • Replies: 8
    • Views: 3,245
    11-10-2011, 02:17 PM Go to last post
  34. simulating bias in fixed-effect dummy regressions

    Earlier today I was typing up a reply to this thread (LINK), but since I don't have a lot of experience with so-called fixed-effects dummy regression...

    Started by Jake‎, 03-31-2012 08:30 PM
    • Replies: 0
    • Views: 3,243
    03-31-2012, 08:30 PM Go to last post
  35. Mixing lasso with OLS

    Hi, I am looking at a data set of 45 continuous IV and 1 DV, trying to find an acceptable regression model. I tried the lasso with cross-validation...

    Started by rogojel‎, 06-02-2014 01:28 PM
    lasso, model building, ols regression, p-value
    • Replies: 4
    • Views: 3,243
    06-06-2014, 02:50 PM Go to last post
  36. collinearity - incorrect sign?

    I read from a book that the collinearity (or multicollinearity) could possibly lead the signs of the regression coefficients to being incorrect....

    Started by liamplayt‎, 04-25-2011 10:01 PM
    collinearity, regression
    • Replies: 4
    • Views: 3,241
    04-26-2011, 02:43 AM Go to last post
  37. [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: 3,239
    06-21-2014, 08:25 AM Go to last post
  38. Interpreting residuals

    Still getting used to interpreting large numbers of data points for regression assumptions. The attached looks fan shaped to me, which it is said...

    Started by noetsi‎, 06-09-2016 01:42 PM
    • Replies: 10
    • Views: 3,239
    08-01-2016, 08:16 AM Go to last post
  39. Moderation Analysis through Process by Andrew Hayes and SPSS regression analysis

    Hello all, I need help analyzing some data for a moderation analysis. I have a continuous variable (predictor), Exhaustion, a continuous outcome,...

    Started by confooseddesi89‎, 08-09-2014 10:22 PM
    interaction, moderation, process, regression, significance
    • Replies: 0
    • Views: 3,238
    08-09-2014, 10:22 PM Go to last post
  40. reporting ordinal regression results

    Hi, I have been working on analyzing a survey data using SPSS. I am supposed to use ordinal regression analysis. I have watched a couple of videos...

    Started by wafi‎, 04-30-2013 01:01 PM
    • Replies: 2
    • Views: 3,236
    04-30-2013, 03:47 PM Go to last post
  41. Multi-Level Model

    Why in multi-level models can you get away with fewer observations per predictors? I know that I have heard and seen this before, but I am not...

    Started by hlsmith‎, 12-09-2014 08:57 AM
    • Replies: 9
    • Views: 3,234
    03-11-2015, 11:56 AM Go to last post
  42. To Classify Or Not -- Does it make sense to use income brackets?

    At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

    Started by bryangoodrich‎, 09-08-2012 03:59 PM
    • Replies: 13
    • Views: 3,233
    09-11-2012, 10:10 AM Go to last post
  43. Interpretation of high R2 with curvature in residuals and significant lack of fit

    Hello: I have a multiple regression model that shows 91% R^2 but has an s-shaped residuals plot and a significant lack of fit test. I am trying to...

    Started by need‎, 01-25-2012 04:30 PM
    • Replies: 2
    • Views: 3,227
    01-26-2012, 08:27 PM Go to last post
  44. cumulative odds ratios - additive or exponential?

    I have run some regression models that examine the effect of variable X (a 15 point continuous scale) on Y (a binary variable - didn't perform/did...

    Started by Marvelli‎, 10-30-2013 11:16 AM
    logistic regression, odds ratio
    • Replies: 3
    • Views: 3,225
    10-31-2013, 11:49 AM Go to last post
  45. Interpreting multiple (IV) categorical variables in regression

    The treatment in the text I have read break an independent categorical variable into k-1 dummy variables. You then compare these to reference level...

    Started by noetsi‎, 02-04-2013 02:04 PM
    • Replies: 2
    • Views: 3,217
    02-04-2013, 02:15 PM Go to last post
  46. Pleease help!? Filling in "blanks" in Regression Output

    Hello! Can someone please explain, I need to fill in the blanks marked They provide this info in a row: Coeff:-9074.674 Std.Err: ?? ...

    Started by Cold_w‎, 01-06-2016 03:26 PM
    p-value, regression analysis, standard error, stata, t-statistic
    • Replies: 9
    • Views: 3,217
    01-07-2016, 07:42 AM Go to last post
  47. 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: 3,216
    01-11-2013, 06:25 AM Go to last post
  48. Algebraic Definition of Residuals from a Regression

    I just need a hint on how to get started on this. Any advice? Define the residual from a regression (one independent variable) algebraically and...

    Started by cassetete‎, 03-01-2011 09:07 AM
    regression analysis
    • Replies: 1
    • Views: 3,214
    03-02-2011, 01:31 PM Go to last post
  49. I think this is a simple question but I can't seem to find it in my stats book

    I have a linear regression equation (y=6.0707x-1200.2) that was used to develop 50 point estimates. The sum of these estimates is the point estimate...

    Started by bugle4one‎, 01-19-2017 11:27 AM
    • Replies: 12
    • Views: 3,209
    01-20-2017, 02:29 PM Go to last post
  50. Analysis of Data over time?

    Hi! I am investigating animal social networks and I have long term data set spanning 15 years. I have looked at each animals 'network position'...

    Started by Emma2415‎, 12-13-2010 06:31 AM
    • Replies: 0
    • Views: 3,208
    12-13-2010, 06:31 AM Go to last post
  51. Multicollinearity and SigmaStat

    Hello all, First, thank you for taking the time to read and answer my question! I am doing a multiple logistic regression analysis in Sigma...

    Started by t2oo5‎, 08-03-2010 11:42 AM
    • Replies: 1
    • Views: 3,206
    08-03-2010, 01:58 PM Go to last post
  52. I need to understand regression analysis. Please Help

    Hi guys i need help badly. We were given this to solve in my first RA class and i have no idea how to begin. Please this is the first time i'm...

    Started by henryneo‎, 09-01-2009 10:07 AM
    • Replies: 2
    • Views: 3,204
    09-06-2009, 09:00 PM Go to last post
  53. Nonparametric multiple regression

    I want to know how to conduct the nonparametric equivalent of a multiple regression? I have 3 variables that are correlated according to spearman's...

    Started by marinelizard‎, 11-27-2009 06:26 PM
    • Replies: 0
    • Views: 3,201
    11-27-2009, 06:26 PM Go to last post
  54. Importance of bias in estimators

    I always thought that bias was the central issue in an estimator. The one thing you had to avoid above all else and the gold standard to evaluate the...

    Started by noetsi‎, 12-30-2014 01:32 PM
    • Replies: 12
    • Views: 3,201
    12-30-2014, 02:46 PM Go to last post
  55. Pros & Cons of a pooled model versus a non pooled one

    Dear All, so this is what I mean, so I am looking at determinants of learning achievements of children. Cool. So now I would like to understand...

    Started by belfagor71‎, 04-12-2013 12:24 AM
    • Replies: 8
    • Views: 3,195
    04-16-2013, 11:45 AM Go to last post
  56. Logistic Regression Output

    Hey All, Can someone help me make sense of this Minitab output? A few questions I had are: What does the odds ratio statistic mean? what does...

    Started by MaxPowers‎, 12-11-2016 11:16 PM
    • Replies: 3
    • Views: 3,191
    12-13-2016, 01:44 AM Go to last post
  57. Lightbulb Multiple Linear Regression w/ Categorical Predictor Variables (Linearity Assumption?)

    Hi, How do we test the linearity assumption for categorical predictor variables such as gender? What kind of a transformation do I need to use?

    Started by surveystat‎, 05-01-2011 04:04 AM
    • Replies: 0
    • Views: 3,188
    05-01-2011, 04:04 AM Go to last post
  58. standardized parameters

    Hello, can anyone help me with a brief explanation? Usually I use the "stb" model option while running the proc logistic in sas to calculate the...

    Started by conni‎, 06-14-2011 05:17 AM
    • Replies: 0
    • Views: 3,187
    06-14-2011, 05:17 AM Go to last post
  59. Diagnostics in regression: A visual example

    The follwing R-code/picture shows a simple linear regression with no outliers and 3 different kind of outliers. It also plots the diagnostic values,...

    Started by thedreamshaper‎, 12-13-2010 07:01 AM
    • Replies: 0
    • Views: 3,186
    12-13-2010, 07:01 AM Go to last post
  60. Unhappy i cant understand this question :|

    Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

    Started by smile:D‎, 01-20-2011 10:58 AM
    sxx, syy
    • Replies: 1
    • Views: 3,186
    01-20-2011, 12:04 PM Go to last post

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