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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Does fitting of a regression line as such contribute to mass significance?

    Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

    Started by Bassler‎, 03-06-2012 05:04 AM
    false positives, fitting a line, least squares, mass significance, regression line
    • Replies: 0
    • Views: 1,612
    03-06-2012, 05:04 AM Go to last post
  2. using utilities of different attribute levels (from conjoint analysis) in regression?

    In short, I am trying to measure factors influencing an intention-to-purchase a product, with use of a regression. However, some of my constructs...

    Started by bassya‎, 07-27-2011 06:13 AM
    conjoint analysis, part-worths, regression analysis, utilities, variable calculation
    • Replies: 1
    • Views: 2,393
    07-27-2011, 05:29 PM Go to last post
  3. Chi Square and Regression

    Hi all, First time post so please go easy on me :p I have a bunch of categorical variables that I am thinking of using as predictor variables...

    Started by Bathy1‎, 03-29-2016 03:09 PM
    • Replies: 3
    • Views: 1,807
    03-30-2016, 12:18 PM Go to last post
  4. Proof

    Hello! I've read a textbook with the following expression. "y = beta 0 + beta 1 * lnx + u" and it claimed that end up: delta y = beta 1 * ((delta...

    Started by BatmanForever‎, 08-08-2016 05:30 AM
    • Replies: 1
    • Views: 2,034
    08-08-2016, 09:31 AM Go to last post
  5. Multiple regression: one of my significant factors has outliers, what should I do?

    So I ran a multiple regression and found two factors that explained one of my dependent variables quite well. The problem is that one of the two...

    Started by battlepope‎, 03-19-2015 09:18 PM
    • Replies: 2
    • Views: 2,015
    03-22-2015, 07:29 AM Go to last post
  6. Compare slopes of multiple regression models - repeated measures at mult conditions

    In an experiment I measured how hard (torque, dependent variable) subjects could push against a plate as it rotated at 4 speeds: stopped, slow,...

    Started by baxterj‎, 08-08-2013 02:12 PM
    • Replies: 3
    • Views: 2,576
    08-09-2013, 12:52 PM Go to last post
  7. Best analysis to use.

    Hi - I am new to using Stats and wanted to know if regression would work in the below scenario. I have two sets of hotel occupancy rates by...

    Started by BB1303‎, 06-25-2012 12:57 AM
    regression
    • Replies: 4
    • Views: 1,996
    06-25-2012, 08:03 PM Go to last post
  8. Trying to think of alternative methods to approaching my model for dynamic pricing

    Right now i run a pricing experiment where 25%of users get one of 4 random prices. After collecting sufficient data, I split my data into training...

    Started by bball3212‎, 12-16-2016 10:37 AM
    • Replies: 0
    • Views: 2,212
    12-16-2016, 10:37 AM Go to last post
  9. GEE prediction interval... Help?

    Ok, so I'm a bit stuck here... I used a GEE model, with 2 groups (group as factor) within each group subjects walk at two different walking speeds....

    Started by bbikkel‎, 01-30-2011 03:33 PM
    • Replies: 0
    • Views: 2,460
    01-30-2011, 03:33 PM Go to last post
  10. suppressor variables

    I have built a multiple linear regression model with two independent variables (say X1 and X2). The primary aim is *not* to use the model for...

    Started by bbkaran‎, 11-17-2010 05:58 AM
    • Replies: 0
    • Views: 2,399
    11-17-2010, 05:58 AM Go to last post
  11. Industry-Year regressions - excluding observations - need advice

    Hello, I am trying to run firm-year specific regressions in SAS to get to an expected value for industry-year. However, I need to exclude the i'th...

    Started by bcommerf‎, 05-12-2011 08:47 AM
    regression, regression analysis, sas
    • Replies: 0
    • Views: 2,355
    05-12-2011, 08:47 AM Go to last post
  12. Scaling variables in regression

    If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both...

    Started by bcrider‎, 09-24-2014 12:32 AM
    categorical data, r program, regression analysis, scaling
    • Replies: 3
    • Views: 2,714
    09-24-2014, 03:30 PM Go to last post
  13. Angry Violation of linearity assumptions - binary logistic regression - what to do?

    I am running a binary logistic regression with SPSS and unfortunately the assumption of linearity (Box-Tidwell procedure) are not met for the...

    Started by beatoctane‎, 05-22-2016 05:18 AM
    • Replies: 10
    • Views: 2,457
    05-26-2016, 01:46 PM Go to last post
  14. Smile Interpret Transformed Independent Variables

    Dear Forum, I ran a logistic regression and one of my Independent variables was transformed with a LG10. I know from normal non transformed...

    Started by beatoctane‎, 06-12-2016 07:22 AM
    • Replies: 1
    • Views: 737
    06-12-2016, 12:15 PM Go to last post
  15. Unhappy Help !! 3 days for my thesis ! Robustness for independent variables?

    Dear Forum, I have a huge problem. I am running a logisitc regression and for some IVs the assumption of linearity was not met. Now I need...

    Started by beatoctane‎, 06-12-2016 07:32 AM
    • Replies: 0
    • Views: 1,023
    06-12-2016, 07:32 AM Go to last post
  16. Advice on Regression Model Using PROC GLM in SAS

    Hi Everyone, thanks for your insight on this. I will try to explain my data set as well as possible. One of the models I am running on my data...

    Started by becca05meg‎, 02-21-2014 08:39 PM
    model, multiple regression, proc glm
    • Replies: 0
    • Views: 1,071
    02-21-2014, 08:39 PM Go to last post
  17. Comparing two linear regression gradients?

    Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

    Started by becread95‎, 04-25-2015 08:24 AM
    • Replies: 6
    • Views: 4,810
    04-29-2015, 09:08 AM Go to last post
  18. Durbin-Watson

    Hi, Do I need to run a Durbin-Watson test if I am finding regressions for the number of second-language words learnt in a week based on age in...

    Started by becread95‎, 04-29-2015 09:12 AM
    • Replies: 2
    • Views: 1,864
    10-16-2015, 04:18 PM Go to last post
  19. multiple regression help

    Hi guys, I was reading the following example from a book, but couldn't understand a couple of things. Could you help me out here? Here is the...

    Started by beemzet‎, 01-21-2010 02:21 PM
    • Replies: 1
    • Views: 2,304
    01-22-2010, 02:50 PM Go to last post
  20. Multiple Linear Regression: Transformation, testing of normality, heteroscedasticity

    Hello everyone, I have a question that might be a basic one, but still I want to reassure myself that I am not on the wrong path by hearing the...

    Started by bekkiee‎, 06-27-2012 05:09 PM
    • Replies: 6
    • Views: 4,921
    06-28-2012, 09:18 AM Go to last post
  21. Box-Tidwell procedure

    Hello everyone, Is there a possibility to perform Box-Tidwell procedure in SPSS, or any other convenient software? Thanks.

    Started by bekkiee‎, 06-28-2012 04:38 PM
    • Replies: 0
    • Views: 5,616
    06-28-2012, 04:38 PM Go to last post
  22. Regression on coordinates

    Hello everyone, I plan to include coordinates as covariates in the regression equation in order to adjust for the spatial trend that exists in the...

    Started by bekkiee‎, 07-04-2012 08:01 PM
    • Replies: 0
    • Views: 2,356
    07-04-2012, 08:01 PM Go to last post
  23. 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: 3,205
    04-16-2013, 11:45 AM Go to last post
  24. Dealing with endogenous independent variables (Car Industry Project)

    I am running a regression on vehicle demand (vehicle registrations in 2011) with the following independent variables: Assembly location Price...

    Started by BellaRiley‎, 04-12-2013 01:27 PM
    endogenous, regression analysis, variables, vehicle
    • Replies: 0
    • Views: 1,192
    04-12-2013, 01:27 PM Go to last post
  25. Independent variables: 1 to 5 star rating

    Hello, I'm having a little difficulty specifying two independent variables; Customer Score and Expert Score. The reviews are each assigned 1 to...

    Started by BellaRiley‎, 04-24-2013 12:39 PM
    • Replies: 5
    • Views: 2,656
    04-25-2013, 12:11 AM Go to last post
  26. Percentage change of dependent variable (MLR)

    Greetings, I went through SPSS regression analysis of a certain dataset, tested assumptions, and finally I got a multiple regression model:...

    Started by bellcross‎, 12-20-2015 09:13 AM
    • Replies: 3
    • Views: 6,413
    12-21-2015, 03:34 PM Go to last post
  27. Excel and StatPlus to do Multiple Regression

    Hi all--I would be grateful for any help with this! I am doing my statistics research project on whether or not there is a correlation b/w where...

    Started by Belle‎, 11-29-2012 05:26 PM
    • Replies: 4
    • Views: 9,849
    11-30-2012, 12:39 PM Go to last post
  28. Developing a function/algorithm to solve for voltage drift

    Hey guys, So in one of my classes we are studying composite materials. We did an experiment where a piece of composite material was anchored at...

    Started by benanderson08‎, 02-13-2014 10:04 AM
    • Replies: 0
    • Views: 1,071
    02-13-2014, 10:04 AM Go to last post
  29. Need HELP!... building a multible linear regression model

    Dear all, i am not sure which variables and model I should choose for the following question, which is part 7 of a research, since I think almost all...

    Started by benjam1n‎, 04-16-2010 08:36 AM
    • Replies: 0
    • Views: 2,094
    04-16-2010, 08:36 AM Go to last post
  30. Using Bonferonni in Multiple Regression

    Hi all, I'm currently working on a data-set involving several continuous independent variables and i'm wondering how the Bonferonni correction can...

    Started by benjamine85‎, 05-09-2016 02:56 AM
    • Replies: 1
    • Views: 930
    05-09-2016, 05:37 AM Go to last post
  31. Fixed effects estimation: how many dummy variables can be included in model

    Dear community, For my Bachelor-Thesis I have to assess the link between a firm's connectedness and success. For this purpose I was given data...

    Started by Benni‎, 03-28-2014 03:41 PM
    • Replies: 1
    • Views: 1,647
    03-30-2014, 03:55 AM Go to last post
  32. Questions on which stats to use & sigmaplot for Logistic Regression

    Hi Everyone, This is my first time on the forum. I have been having problems deciding on what test to use for my data and how to input the data...

    Started by Bennice‎, 03-04-2013 07:59 PM
    • Replies: 5
    • Views: 4,273
    03-05-2013, 12:09 PM Go to last post
  33. compare regression effects nested models

    Dear forum, The following problem is puzzling me for a while. Suppose I have two nested models, where y is the same dependent variable and x1 is...

    Started by benp‎, 05-27-2014 05:13 AM
    effect change controlling
    • Replies: 4
    • Views: 1,858
    05-29-2014, 12:50 PM Go to last post
  34. probit vs biprobit

    Its probably just a simple understanding question. Say i have two endogenous binary variables y1 and y2 and I think they are somehow correlated....

    Started by Benrath‎, 12-24-2013 10:54 AM
    • Replies: 0
    • Views: 1,315
    12-24-2013, 10:54 AM Go to last post
  35. 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: 14,036
    06-22-2010, 01:01 AM Go to last post
  36. Lightbulb Bootstrapping confidence intervals for prediction based on SE of the coefficients?

    Is it remotely legitimate to use the standard errors of the coefficients from linear regression in a Monte Carlo simulation to bootstrap 2.5%/97.5%...

    Started by bernoulli‎, 10-15-2011 08:35 PM
    bootstrap, confidence interval, regression
    • Replies: 0
    • Views: 1,576
    10-15-2011, 08:35 PM Go to last post
  37. Logistic regression, but no negative responses?

    So I am trying to model who is likely, from a list of addresses, to go to a store. I have lots of criteria about the people who have visited my...

    Started by bernstml19‎, 08-11-2014 06:42 PM
    binary data, logistic regression, regression analysis
    • Replies: 5
    • Views: 1,341
    08-12-2014, 10:38 AM Go to last post
  38. Panel Data Regression (xtreg) STATA

    Hello everyone, I'm running a pooled tiem series regression with random effects. It runs fine and I'm having a problem interpreting results. I'm a...

    Started by berry16‎, 09-15-2011 09:24 PM
    • Replies: 0
    • Views: 6,354
    09-15-2011, 09:24 PM Go to last post
  39. coefficient standardization

    Hi All, I am working on a 2nd order regression. The span of coefficient is large (say 1:10000). So the coefficients of 2nd order are very big and...

    Started by bettertony‎, 04-10-2014 04:03 PM
    multiple regression, second order polynomial, standardization
    • Replies: 0
    • Views: 994
    04-10-2014, 04:03 PM Go to last post
  40. range of tuning parameters

    Hi All, I have just started my advanced statistics study. And here is one thing I have not been able to understand for long time -- how can we...

    Started by bettertony‎, 10-01-2014 02:40 PM
    cross validation, linear regression, regression, regularization, tuning, tuning parameter
    • Replies: 6
    • Views: 2,666
    10-01-2014, 07:09 PM Go to last post
  41. Binary IV and ordinal DV, suggestions for a model?

    Hi guys! Just started at a new company having graduated this year, theyve got me analysing data and producing some key driver analytics. Thing is,...

    Started by Bfernandez‎, 09-19-2014 11:20 AM
    • Replies: 4
    • Views: 2,791
    10-01-2014, 03:57 AM Go to last post
  42. Understanding ordinal regression

    Hi! This is a really simple question, but one for which the answer continues to elude me! I understand that in a binary logit regression the...

    Started by Bfernandez‎, 10-01-2014 11:08 AM
    ordinal regression, regression analysis, regression coefficients
    • Replies: 0
    • Views: 1,930
    10-01-2014, 11:08 AM Go to last post
  43. Regression: Multiple Independent Variables by Year

    Hello All! First time here and working in SPSS. I'm having a difficult time running a regression using test score proficiency as my dependent...

    Started by BF_Grad‎, 06-06-2017 05:42 PM
    • Replies: 1
    • Views: 760
    06-07-2017, 02:33 PM Go to last post
  44. Question Coefficient of determination interpretation

    Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

    Started by bgst‎, 09-09-2014 07:51 AM
    • Replies: 4
    • Views: 2,085
    09-17-2014, 04:58 PM Go to last post
  45. beginner's specification problems

    Hi, I am doing an assignment on unemployment (DV) and racial discrimination - specifically african-american population - and I am in doubt whether to...

    Started by bicalix‎, 06-04-2014 01:24 PM
    model building, negative binomial, ols regression
    • Replies: 0
    • Views: 1,078
    06-04-2014, 01:24 PM Go to last post
  46. Did i get theese right i am confused, can anyone help me please

    25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

    Started by Bicano‎, 11-30-2008 08:26 PM
    • Replies: 2
    • Views: 21,386
    11-30-2008, 09:08 PM Go to last post
  47. Can you guys check these for me

    Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

    Started by Bicano‎, 12-08-2008 11:07 AM
    • Replies: 1
    • Views: 5,695
    12-08-2008, 03:33 PM Go to last post
  48. Question Multiple Regression - Interpreting t-stat

    Hi all, If the model fit is satisfactory (ie. R-squared value is sufficiently high), how should the t-stat be interpreted... my reading indicated...

    Started by big-b‎, 08-28-2006 12:22 AM
    • Replies: 1
    • Views: 105,205
    08-29-2006, 01:56 PM Go to last post
  49. Analytical solution to correlation between two linear combinations of values

    Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

    Started by BigBugBuzz‎, 09-12-2014 03:39 AM
    analytical solution, correlation
    • Replies: 3
    • Views: 1,756
    09-12-2014, 02:00 PM Go to last post
  50. Residual variance of OLS regression from R-Squared?

    Can residual variance of OLS regression be derived from R-Squared, and if so, how?

    Started by BigBugBuzz‎, 05-16-2015 03:04 PM
    r-square, residual
    • Replies: 2
    • Views: 1,762
    05-17-2015, 11:51 AM Go to last post
  51. Testing the equality of the Residual Sum of Squares of two linear models

    I have two models of a dependent variable: Y = a1 + b1X1 and Y = a2 + b2X2 The variances around the lines of least error are important...

    Started by BigBugBuzz‎, 10-22-2015 08:12 AM
    • Replies: 2
    • Views: 987
    10-22-2015, 09:19 AM Go to last post
  52. Advice on OLS analysis

    Hello Everyone, I’m writing a paper on the relationship between weather on daily public bike share system usage. I’m looking for a bit of advice...

    Started by bikingman‎, 12-14-2016 12:59 PM
    ordinary least squares
    • Replies: 0
    • Views: 1,905
    12-14-2016, 12:59 PM Go to last post
  53. ANOVA - Does Welch's test assume homogeneity of variances, or not?

    In other words, will it return a much smaller standard error when variance are unequal than Fisher's? Or is it not concerned with variance?

    Started by bikingman‎, 12-28-2016 04:02 PM
    anova
    • Replies: 3
    • Views: 2,542
    12-28-2016, 09:46 PM Go to last post
  54. mutliple interactions in same equation

    Hi Folks, I am reviewing a manuscript that uses four interactions in the same equation, and i am wondering if authors need to include higher order...

    Started by Bill M.‎, 01-02-2013 03:53 PM
    interaction terms, multiple interactions
    • Replies: 0
    • Views: 1,064
    01-02-2013, 03:53 PM Go to last post
  55. Std deviation of correlation coefficient?

    Hi I've run a VAR model to find the correlation coefficient between two stock markets. Now I need to find the standard deviation of this...

    Started by Bill77‎, 07-27-2011 06:31 PM
    • Replies: 1
    • Views: 2,965
    07-27-2011, 07:29 PM Go to last post
  56. Help with Regression Equation

    Hi, Basically I need help working out all the variables for a multiple regression equation. The equation used is: Y= X1 R1 + X2 R2 +....Xn Rn +...

    Started by billkarr‎, 04-27-2010 09:30 AM
    • Replies: 2
    • Views: 3,751
    04-27-2010, 10:49 AM Go to last post
  57. How can you deal with categorical variables that aren't present in your training set?

    Let's say I have the following linear regression: earnings = c0 + age * c1 + male * c2 where "male" is a categorical variable and "female" is...

    Started by billybass‎, 04-29-2015 06:24 PM
    • Replies: 1
    • Views: 1,554
    04-30-2015, 02:37 AM Go to last post
  58. Mediation analysis - Preacher & Hayes - could someone check what I've done please?

    I'm new to mediation analysis and have had a go with a simple model. I'd be thrilled if someone could have a look at this and let me know any issues...

    Started by Binka‎, 06-21-2013 03:06 AM
    • Replies: 0
    • Views: 3,108
    06-21-2013, 03:06 AM Go to last post
  59. Post Should I use regression or logit

    Hi Guys, I need to find out the influence of factors affecting female labour force participation. I thought to take female labour force...

    Started by binupv‎, 11-08-2013 11:19 PM
    • Replies: 2
    • Views: 1,751
    11-12-2013, 08:18 AM Go to last post
  60. Model conception

    Hello! I have a basic stats question: I want to model a phenomenon, and estimate parameters. How many observations would I need, to be as...

    Started by BioLion‎, 09-01-2016 04:44 AM
    degrees of freedom, dof, model
    • Replies: 0
    • Views: 864
    09-01-2016, 04:44 AM Go to last post

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