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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 2,083
    04-26-2012, 11:26 AM Go to last post
  2. 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: 1,876
    04-29-2012, 06:26 AM Go to last post
  3. 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: 1,060
    08-06-2012, 05:15 AM Go to last post
  4. Are my residuals normal?

    Hi there, I have performed a multiple regression analysis and am checking the assumptions. The normal probability plot is not exactly a straight...

    Started by bradyj2‎, 09-05-2012 08:01 AM
    • Replies: 9
    • Views: 2,199
    09-05-2012, 06:17 PM Go to last post
  5. Multicollinearity and the 'backward' regression method

    Hello, I have a question about multicollinearity and multiple regression. If you were to use the 'backward' selection method of regression...

    Started by bradyj2‎, 09-06-2012 09:04 AM
    • Replies: 0
    • Views: 2,403
    09-06-2012, 09:04 AM Go to last post
  6. Least significant variable regression

    Hello, Could somebody tell me what is the least significant variable in this regression analysis? What do you look for? Many thanks

    Started by bradyj2‎, 09-06-2012 12:08 PM
    • Replies: 3
    • Views: 2,713
    09-06-2012, 02:54 PM Go to last post
  7. 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: 1,670
    09-15-2012, 11:30 PM Go to last post
  8. Multiple regression, predictors normally distributed?

    Hi, I have a basic question, in multiple regression do the predictors variables have to be normally distributed or is it just the residuals...

    Started by bradyj2‎, 09-13-2012 06:00 AM
    • Replies: 1
    • Views: 1,243
    09-13-2012, 08:49 AM Go to last post
  9. Multicollinearity and the 'backward' regression method

    Hello, Simple question - Am I right is assuming that you cannot use backwards,forwards or best subsets regression techniques if you have two...

    Started by bradyj2‎, 09-26-2012 09:56 AM
    • Replies: 6
    • Views: 2,732
    09-26-2012, 12:22 PM Go to last post
  10. 4PL Non-Linear Regression, Transforming observed y values

    Good Afternoon, I'm currently teaching my self how to fit response curves, and have run into some trouble. I currently need assistance on...

    Started by BrainExploding‎, 10-21-2013 03:34 PM
    4pl, curve fitting, log transformation, non-linear regression, response curve
    • Replies: 7
    • Views: 4,942
    10-22-2013, 12:33 PM Go to last post
  11. multivariate optimazion question

    Hi all, I need to solve a optimization problem like this min||XW-YV||_{F}^{2}, that's to minimize the Frobenius norm. X and Y have the same...

    Started by brakepad‎, 09-01-2010 02:25 PM
    • Replies: 0
    • Views: 1,730
    09-01-2010, 02:25 PM Go to last post
  12. Strange results for logistic regression analysis

    Hi there, I'm having a problem for a while now, and I've asked several people who studied statistics specifically but they are not able to explain...

    Started by bramv‎, 03-08-2013 05:41 AM
    • Replies: 14
    • Views: 3,491
    04-03-2013, 12:20 PM Go to last post
  13. Regression on Composite Rates

    I have what may be a simple question, but I have been unable to find an appropriate methodology, and I am hoping that one of you may be able to help....

    Started by BrandonB‎, 02-22-2012 06:26 PM
    • Replies: 0
    • Views: 2,478
    02-22-2012, 06:26 PM Go to last post
  14. 95% Intervals

    I'm new here (and relatively new to statistics) so I apologize if this thread is in the wrong place. I have a problem that seems relatively easy...

    Started by bravo3‎, 02-05-2012 06:10 PM
    confidence intervals, normal distribution, tolerance intervals
    • Replies: 4
    • Views: 2,223
    02-09-2012, 11:31 PM Go to last post
  15. Question Logistic regression logit or cloglog?

    Hi folks,:wave: currently I'm performing a logistic regression and I'm not sure which link function I should use. I have a binary response...

    Started by breez86‎, 10-04-2012 01:11 PM
    • Replies: 3
    • Views: 18,019
    12-03-2012, 01:37 PM Go to last post
  16. How many IVs can I use?

    I am hoping to publish the results of this in a journal (not a statistics one, an experimental science one). I have a sample size of 71...

    Started by BrenH‎, 11-05-2009 01:00 AM
    • Replies: 2
    • Views: 2,998
    11-11-2009, 04:08 PM Go to last post
  17. Manually calculating weights for WLS

    *Posted in Stat Consulting but moved here b/c I think it's more fitting. Hi guys, I'm trying to figure out how to manually calculate the...

    Started by brett45‎, 01-13-2010 03:21 PM
    • Replies: 0
    • Views: 4,407
    01-13-2010, 03:21 PM Go to last post
  18. Elasticity with negative predictors

    Hello All: I am trying to determine elasticity of demand using relative price position (my price minus competitors price) as the predictor. I know...

    Started by brewnami‎, 05-11-2012 09:23 AM
    • Replies: 2
    • Views: 1,960
    06-04-2012, 02:00 PM Go to last post
  19. calculating adjusted rsquared by hand

    Hi. I just wanted to make sure I am doing these calculations correctly. I have 8 models, one with no variables. So to get the adjusted rsquared, I...

    Started by brian005‎, 10-21-2013 06:43 PM
    • Replies: 1
    • Views: 8,104
    10-30-2013, 11:59 AM Go to last post
  20. linear regression Johnson Transformation

    If two predictor variables transformed by the Johnson Transformation (see Minitab or Johnson 1949) are used in separate linear regressions (assuming...

    Started by Brian707‎, 01-02-2013 02:19 AM
    linear regression, model comparison, r squared, transformation
    • Replies: 1
    • Views: 3,354
    01-02-2013, 10:59 AM Go to last post
  21. statistical tool/program for obtaining stiffness properties by force-deflection data

    I am performing flexural testing of composite honeycomb sandwich panels as per D7250,desired deliverables(stiffness values G,U and D) are obtained...

    Started by Brook79‎, 03-01-2015 11:42 AM
    • Replies: 0
    • Views: 1,384
    03-01-2015, 11:42 AM Go to last post
  22. Understanding Mixed Effects Regression Models

    Can anyone explain to me the difference between mean effect and change when using a mixed effects regression model? I understand mean effect to be...

    Started by Brook99‎, 04-26-2017 03:34 AM
    • Replies: 0
    • Views: 594
    04-26-2017, 03:34 AM Go to last post
  23. So many variables--how to approach this?

    I'm working on a project about depression as a possible side effect of a particular medication. The people who take this drug also tend to have...

    Started by brooklynqueen‎, 08-10-2010 10:31 PM
    • Replies: 9
    • Views: 4,125
    08-11-2010, 05:24 PM Go to last post
  24. Sum of the squared least squared residual

    Hey guys! This is my first post on this booming forum! I came across a problem that asks "Find the Sum of the squared least squared residual"...

    Started by brothers10‎, 09-16-2013 09:50 AM
    least squares, regression models, residual, stats
    • Replies: 0
    • Views: 1,419
    09-16-2013, 09:50 AM Go to last post
  25. Regression or LSD for discrete quantitative factor?

    I have a 2-factor factorial experiment where Factor A is quantitative and continuous with 2 levels (100 and 200). Factor B is quantitative, but...

    Started by brownmoses‎, 12-28-2009 12:55 PM
    • Replies: 0
    • Views: 2,928
    12-28-2009, 12:55 PM Go to last post
  26. beta = r, so can beta be greater than 1.0?

    I have a basic question, but it's been a long time since I learned regression. I'm having trouble reconciling these three facts: (1) In a...

    Started by bruin‎, 11-11-2013 03:40 PM
    • Replies: 13
    • Views: 4,129
    11-14-2013, 01:15 AM Go to last post
  27. 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: 3,192
    12-05-2010, 06:45 PM Go to last post
  28. Interaction Term in Logistic Regression

    I'm reading Kutner, et al., Applied Linear Statistical Models (5th), and came across something I don't recall the authors explaining. I vaguely...

    Started by bryangoodrich‎, 06-17-2011 12:07 AM
    • Replies: 8
    • Views: 8,920
    06-17-2011, 05:10 PM Go to last post
  29. ANCOVA and geography help

    For a GIS class project, I'm doing some research based on Christopher Rumh's 2000 paper Are Recessions Good for your Health? In it, he analyzes...

    Started by bryangoodrich‎, 11-02-2011 03:44 PM
    • Replies: 1
    • Views: 2,364
    11-03-2011, 03:09 AM Go to last post
  30. 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: 3,208
    09-11-2012, 10:10 AM Go to last post
  31. Adding main effects when main effects model is insignificant

    Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

    Started by bryantw‎, 11-05-2015 05:57 PM
    • Replies: 1
    • Views: 912
    11-05-2015, 07:31 PM Go to last post
  32. Sparse Logistic regression

    What method should be used when the proportions of 1's in a logistic regression problem is very low. (lets say 0.04%)???? Normal logistic method...

    Started by bs0409‎, 11-12-2010 05:28 AM
    • Replies: 2
    • Views: 2,730
    01-13-2011, 08:01 AM Go to last post
  33. Interpreting Odds Ratio after Weight of evidence transformation

    I am doing a logistic modeling with several continuous variables and binary outcome variable. 1- event 0-non event. I did the initial modeling with...

    Started by bssekar‎, 05-02-2016 08:30 PM
    logistic regression, odds ratio, weight of evidence
    • Replies: 2
    • Views: 1,118
    05-03-2016, 10:16 AM Go to last post
  34. Help Please.

    Suppose that you wish to use a linear regression to predict the dependent variable Y using the dependent variable X1. You collect a scatter plot of...

    Started by btnh33‎, 06-03-2009 06:06 PM
    • Replies: 0
    • Views: 1,946
    06-03-2009, 06:06 PM Go to last post
  35. should I specify or let GLM estimate the ancillary parameter?

    Hi, I am using GLM negative binomial regression to examine a positively skewed dv. Under Type of Model, there is a subsection of the menu where...

    Started by buggles001‎, 01-20-2014 06:13 AM
    • Replies: 0
    • Views: 1,633
    01-20-2014, 06:13 AM Go to last post
  36. Negative Binomial Reg - why changes in significance using one less/similar variables?

    Hi, I am running a NBR on a sample of 500 participants to predict survival rate from a set of health indices eg. diagnosed diabetic, history of...

    Started by buggles001‎, 01-07-2014 06:46 AM
    • Replies: 0
    • Views: 932
    01-07-2014, 06:46 AM Go to last post
  37. 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: 3,168
    01-20-2017, 02:29 PM Go to last post
  38. [SOLVED] model coefficients

    I need a little help with the output of this model. Below is the output of a linear model of log river flow over time: ...

    Started by bugman‎, 04-03-2014 01:00 AM
    • Replies: 4
    • Views: 1,492
    04-03-2014, 10:27 PM Go to last post
  39. 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: 4,810
    10-11-2009, 04:10 AM Go to last post
  40. Dissertation help with Likert scale

    Hello, I'm having some problems with the stats for my dissertation. My dissertation is about the effect of the physical surroundings of a...

    Started by Bunecarera‎, 04-15-2008 05:28 AM
    • Replies: 9
    • Views: 11,498
    04-16-2008, 01:27 PM Go to last post
  41. Thumbs down multi group SEM regression coefficient/t-value interpretation

    Hello, I have a small interpretation issue. A chi-square difference test between unconstrained vs constrained multi group sem indicated...

    Started by Buraczku‎, 07-10-2012 05:46 AM
    • Replies: 1
    • Views: 2,603
    07-10-2012, 06:58 AM Go to last post
  42. Finding predicted values with logged (ln) dependent variable.

    Hello all, I'm currently working on my first quantitative project. I am doing an OLS regression in SPSS. I had to take the natural log of my DV in...

    Started by burdfishdemon‎, 07-27-2016 03:21 AM
    log transformation, ols, predicted values, spss, statistics
    • Replies: 4
    • Views: 3,718
    01-23-2017, 11:16 AM Go to last post
  43. Does rate of change in proportion variable depend on ranked independent variable?

    I am doing an analysis on the prevalence of a drug resistance mutation in a particular country and how prevalence changed over time. Samples were...

    Started by bushmanm‎, 03-31-2015 07:38 PM
    • Replies: 0
    • Views: 894
    03-31-2015, 07:38 PM Go to last post
  44. Multiple regression least square estimation

    Can someone show me the equations and the derivation of the least square estimation of multiple linear regression? It would be even greater if...

    Started by byip‎, 05-20-2006 11:44 AM
    • Replies: 0
    • Views: 3,749
    05-20-2006, 11:44 AM Go to last post
  45. Regression analysis research project help.

    Hi, I have a project i have to do for my regression analysis course. Basically I need to gather a bunch of data and plot it and find a regression...

    Started by c2q‎, 10-12-2010 01:10 AM
    • Replies: 1
    • Views: 6,693
    10-12-2010, 01:07 PM Go to last post
  46. Need some help with multiple regression

    Hi guys. For my project i need to to a regression with a bunch of data I've gathered. I have 7 variables and i did the regression in excel and got...

    Started by c2q‎, 11-02-2010 10:40 PM
    • Replies: 4
    • Views: 2,163
    11-03-2010, 03:28 AM Go to last post
  47. Regression in excel - Is this possible?

    Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

    Started by c2q‎, 11-22-2010 08:14 PM
    • Replies: 5
    • Views: 4,310
    12-11-2010, 01:59 PM Go to last post
  48. Excel's t stat question.

    Hi guys, I'm a little confused over this right now. I performed a regression in excel and as an example, this is what i got for my first...

    Started by c2q‎, 11-23-2010 06:14 PM
    • Replies: 3
    • Views: 5,099
    11-23-2010, 06:49 PM Go to last post
  49. Data for regression analysis

    I am helping a friend with a project involving regression analysis. First off he wants to know if there is a way to determine if the extracted data...

    Started by c2q‎, 05-06-2011 06:43 PM
    • Replies: 4
    • Views: 2,362
    05-07-2011, 11:53 AM Go to last post
  50. Simple regression question

    Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

    Started by c2q‎, 06-12-2011 02:57 PM
    • Replies: 5
    • Views: 2,578
    06-15-2011, 08:06 AM Go to last post
  51. Orthogonal projection onto linear span.

    Hi there. I was hoping someone could give me a starting point on this problem because I'm clueless. given y = x1 =

    Started by c2q‎, 10-23-2011 08:45 PM
    • Replies: 3
    • Views: 3,601
    10-24-2011, 12:55 PM Go to last post
  52. Orthogonal projection in regression analysis.

    Can someone explain what exactly you are trying to find when using orthogonal projection in regression analysis. I don't quite understand it. You are...

    Started by c2q‎, 11-04-2011 10:29 PM
    • Replies: 0
    • Views: 1,778
    11-04-2011, 10:29 PM Go to last post
  53. What Regression Analysis Should I Employ

    Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

    Started by CA92‎, 01-24-2014 10:48 AM
    anova, regression, regression analysis
    • Replies: 4
    • Views: 1,370
    01-25-2014, 05:17 AM Go to last post
  54. Contribution of multiple correlated effects on global observation

    Hello, In a perfect system, I have 0% of signal loss. I found that there are N effects that can contribute to signal loss. I activate each effect...

    Started by Cab‎, 08-04-2015 08:58 AM
    • Replies: 13
    • Views: 1,997
    01-05-2016, 11:35 AM Go to last post
  55. Logistic Regression: model selection and interpretation

    Good Day!! Hi I am working for the first time with logistic regressions and I have some doubts about the model selection and the result that is...

    Started by caelrato‎, 11-16-2011 01:03 PM
    • Replies: 3
    • Views: 5,374
    11-16-2011, 03:17 PM Go to last post
  56. Problem with small amount of cases

    Hi New here, and fairly new with statistics. I have a problem with too few cases, but more than enough variables and observations. I have no...

    Started by Cai‎, 08-16-2009 11:47 AM
    • Replies: 5
    • Views: 2,443
    08-19-2009, 12:09 PM Go to last post
  57. SQReg demonstration

    Hello everyone, i need help with this demonstration: SQReg = B1^2*Sxx Someone can help?

    Started by Calion‎, 06-05-2016 11:35 AM
    • Replies: 1
    • Views: 1,467
    06-06-2016, 12:22 PM Go to last post
  58. OLS with dummy and few observations (12 mean values from 2.5k observations)

    Hi all :) Maybe you can help me with a problem I have in using OLS regression: I have a dataset of 12 markets, in total ~2.5k trades happened...

    Started by callino‎, 12-04-2014 08:08 AM
    • Replies: 1
    • Views: 1,467
    12-04-2014, 09:17 AM Go to last post
  59. Unhappy regression results interpretation help!

    Hi everyone, this is my first post, I have this regression CSAD=a +B|R|+CSAD-1+CSAD-2+e where CSAD is the cross sectional absolute deviation of...

    Started by callput‎, 08-14-2011 08:04 AM
    • Replies: 13
    • Views: 4,908
    08-16-2011, 08:11 AM Go to last post
  60. Combining panel (10 years of data) and survey data (1 year) in one regression

    Quick question regarding a problem I am having: My research explores determinants of municipal recycling behavior, evaluating the effects of...

    Started by caltech27‎, 02-07-2013 01:23 PM
    • Replies: 0
    • Views: 2,478
    02-07-2013, 01:23 PM Go to last post

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