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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Unhappy Regression Help for Masters thesis

    ..........

    Started by Parikshit Luktuke‎, 08-23-2011 09:49 PM
    • Replies: 4
    • Views: 6,204
    08-24-2011, 12:55 AM Go to last post
  2. Does the intercept p value matter?

    Hi, I have outputs of a simple linear model as follows: y = 0.0339 + 0.27918X The p value of the intercept is 0.206 and of the slope is...

    Started by anglais428‎, 03-08-2011 06:48 AM
    intercept p value
    • Replies: 4
    • Views: 50,762
    03-28-2011, 08:14 PM Go to last post
  3. Need help on regression

    I am doing a regression analysis. One one side, independent, I have treatment days/fractions and on other side, dependent, i have a measure of...

    Started by statsdoc1‎, 03-16-2011 08:51 AM
    fixed intercept
    • Replies: 4
    • Views: 2,874
    03-18-2011, 10:36 AM Go to last post
  4. Logistic transformation - please help with the use of scientific calculator

    Hi there, I believe I have a trivial question. I am studying logistic regression and trying to understand how the values are transformed - e.g ...

    Started by Sylviastat‎, 03-29-2011 01:57 PM
    • Replies: 4
    • Views: 3,905
    03-29-2011, 05:34 PM Go to last post
  5. Help with Mutiple Regression Analysis

    Hello, I am doing my dissertation on Racial differences in Stigma related attitudes towards mentall illness. I have 200 participants, 120 from...

    Started by katerine75‎, 03-30-2011 05:24 PM
    • Replies: 4
    • Views: 3,021
    04-07-2011, 08:50 PM Go to last post
  6. Which statistical test should I use?

    I am struggling with my dissertation, as having collected my data, I am unsure of which test to use. I am investigating the differences in imagery...

    Started by Rhys2175‎, 04-13-2011 08:13 AM
    • Replies: 4
    • Views: 4,899
    09-01-2011, 02:15 PM Go to last post
  7. Multiple regression test of significance using r squared

    I have a multiple regression with 5 independent variables, and obtained the r^2. Then I removed two IVs, and get the R^2 for the reduced model with...

    Started by mattc‎, 04-19-2011 01:47 PM
    • Replies: 4
    • Views: 9,734
    04-19-2011, 05:06 PM Go to last post
  8. Logistic Regression Probability

    Hi Guys, I'm working on a simple logistic regression problem. I'm wanting to find the exact value of x(independent variable) that gives a 0.5...

    Started by csb89‎, 04-19-2011 04:00 PM
    • Replies: 4
    • Views: 2,555
    04-22-2011, 02:47 PM Go to last post
  9. Multiple Regression: Help to prove SD Beta 3 minus Beta 4

    Hi I've been having a lot of trouble with this problem. How do I show that; SD_Beta3 - Beta4 = √(Var(Beta_3)+Var(Beta_4)-2Cov(Beta_3, Beta_4))...

    Started by sykes87‎, 04-21-2011 12:06 PM
    variance for rv sum
    • Replies: 4
    • Views: 2,752
    04-21-2011, 05:57 PM Go to last post
  10. Estimated Variance of R squared

    I'm looking to compare two R squareds using a formula derived from a article called Correlation Redux by Olkin & Finn. This technique doesn't appear...

    Started by trinker‎, 04-21-2011 07:35 PM
    • Replies: 4
    • Views: 7,426
    04-23-2011, 11:50 AM Go to last post
  11. 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: 3,207
    04-26-2011, 02:43 AM Go to last post
  12. 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: 2,380
    05-07-2011, 11:53 AM Go to last post
  13. Ratings of spotlights

    I'd like to maximize my candlepower per dollar for spotlights. The packaging may list one or two parameters of watts, lumens or candlepower and I'd...

    Started by Outlier‎, 05-18-2011 06:24 PM
    • Replies: 4
    • Views: 2,456
    05-19-2011, 01:00 PM Go to last post
  14. How to approach model selection

    Hi, This is my first formal attempt at a regression analysis that we hope to write up and submit. Basically we're wanting to investigate the effect...

    Started by pgseye‎, 05-20-2011 02:44 PM
    • Replies: 4
    • Views: 2,941
    05-21-2011, 02:07 AM Go to last post
  15. crazy b and exp(b) in logistic

    Hi I'm running an interaction in logistic regression and when I do so my b and exp(b) for one of my main effect variables gets crazy. I know that...

    Started by dce219‎, 05-27-2011 11:40 AM
    • Replies: 4
    • Views: 2,701
    05-27-2011, 01:20 PM Go to last post
  16. Z-test in NB regression model

    what is the null hypothesis of z-test in negative binomial regression?

    Started by najmehjami‎, 06-12-2011 04:55 PM
    • Replies: 4
    • Views: 3,468
    06-15-2011, 10:54 AM Go to last post
  17. Is this method to compare F value correct?

    Hi. I am getting this result for my regression showing the F value. I used this website to calculate the critical-F value and compared it to...

    Started by graphicsgriffin‎, 06-30-2011 01:57 PM
    • Replies: 4
    • Views: 5,058
    07-01-2011, 04:19 PM Go to last post
  18. Multiple Regression: Dependent Variable has sub-categories

    I want to be able to predict Total Spare Part Costs (Y). There are 2 types of spare parts contributing to the total costs. Let Spare Part 1 = SP1...

    Started by m007836‎, 07-17-2011 08:30 PM
    • Replies: 4
    • Views: 4,172
    07-31-2011, 06:07 PM Go to last post
  19. An easy question about Generalized Linear Model

    Hello everyone, I just started using GLM and was stuck by an easy question of GLM. If I already obtain the estimates of the parameters, let's...

    Started by copyfriend‎, 07-18-2011 01:11 PM
    • Replies: 4
    • Views: 2,364
    07-18-2011, 02:02 PM Go to last post
  20. large measurement units - problem with interpretation and prediction....

    Hi there, The model seemed good and Rsq. high, but large measurement unit (in 10 power 9) of the response variable seem to be problem.... When...

    Started by Sylviastat‎, 07-26-2011 03:51 PM
    • Replies: 4
    • Views: 2,672
    07-28-2011, 03:27 AM Go to last post
  21. Sum of Residual equal to zero

    I want to know why when you multiply the residual by Y_hat the sum of this new equation is still zero? So in other words I have summation from 1...

    Started by Cookie‎, 08-05-2011 09:49 PM
    • Replies: 4
    • Views: 10,286
    08-07-2011, 11:17 PM Go to last post
  22. Poisson regression and effects of predictors

    Dear all, I just registered this forum too, since I am in doubt what to do! In a study, I want to determine the effects of grazing by animals...

    Started by jaofik‎, 08-23-2011 02:58 PM
    • Replies: 4
    • Views: 5,556
    08-24-2011, 06:50 AM Go to last post
  23. Assumptions that underlie a regresion model

    Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want...

    Started by katlego‎, 09-23-2011 08:45 PM
    residual plots, residuals
    • Replies: 4
    • Views: 3,127
    09-26-2011, 11:52 AM Go to last post
  24. Sum of squares proof

    Hallo Im tring to prove that correct sum of cross products Sxy = Sum of (Xi)(Yi) - n XiYi given that Sxy = Sum of (Xi - Xbar)(Yi - Ybar). Can you...

    Started by RogerF‎, 09-28-2011 02:20 PM
    • Replies: 4
    • Views: 12,193
    09-29-2011, 03:22 AM Go to last post
  25. Stupid Q: Interpretation of slope in OLS

    Hi ppl I'm running a bunch of regressions on a series of stock returns (decimal values). One of the models is: r_t = a0 + b1*rm_t + e ...

    Started by Jonni‎, 10-05-2011 12:13 PM
    ols
    • Replies: 4
    • Views: 3,003
    10-07-2011, 12:02 PM Go to last post
  26. change in significance level (univariate vs multivariate)

    I have 3 independent variables, X, Y and Z when I do univariate regression on each of them, the t-statistics are -4.7, 1.8 and 2.2, respectively....

    Started by espes‎, 10-24-2011 06:35 PM
    • Replies: 4
    • Views: 5,076
    10-25-2011, 10:09 AM Go to last post
  27. Joint hypothesis testing

    Hi, I am working on a 'quick' study on whether ex-ante probabilities predict the actual realized outcomes of sporting events. My model is ...

    Started by rotanho‎, 10-27-2011 04:35 PM
    • Replies: 4
    • Views: 5,091
    10-31-2011, 06:30 AM Go to last post
  28. Autocorrelation/Regression

    Post deleted

    Started by Carlyn‎, 10-29-2011 09:06 AM
    • Replies: 4
    • Views: 3,021
    10-29-2011, 09:58 AM Go to last post
  29. Univariate vs Multivariate Analysis, Quick Question

    Hey guys, I have a very quick question! I'm presenting a medical research paper and it uses univariate and multivariate analysis. Sometimes a...

    Started by THX‎, 11-05-2011 01:08 PM
    • Replies: 4
    • Views: 9,545
    11-07-2011, 04:32 PM Go to last post
  30. Regression analysis

    Hi I'm currently doing a case study for school and I'm just wondering if I'm on the right track. I'm doing regression analysis on what determines the...

    Started by Kokujin‎, 11-23-2011 11:57 PM
    • Replies: 4
    • Views: 1,967
    11-25-2011, 11:16 PM Go to last post
  31. Regression suitability question

    Hello, Could anyone help me out with some pointers please? I'm looking to use some statistics to help predict student % school absence rates...

    Started by orangecrush‎, 11-13-2011 04:42 AM
    • Replies: 4
    • Views: 3,905
    11-13-2011, 06:00 PM Go to last post
  32. Moderated Multiple Regression versus Factorial ANOVA.

    I am analyzing an interaction effect between two continuous independent variables (Z and X) on a continuous dependent variable (Y). I have...

    Started by Holmes‎, 11-19-2011 04:30 AM
    factorial anova, interaction term, moderated regression
    • Replies: 4
    • Views: 4,611
    11-20-2011, 07:23 AM Go to last post
  33. Smile Calculating Covariance Matrix (Regression Analysis)

    Im having difficulty in trying to compute the Covariance Matrix. I think Im missing out an equation to be honest. Here's what I've been given in the...

    Started by garunas‎, 11-27-2011 01:19 PM
    covariance matrix, least squares, regression analysis, variance
    • Replies: 4
    • Views: 6,889
    11-28-2011, 04:36 PM Go to last post
  34. The Mediation Analysis by Regression

    Hi All, Does Anyone Know a good reference to conduct the Mediation Analysis by Regression by SPSS? Many thanks, Gh

    Started by ghada8888‎, 11-30-2011 01:48 PM
    • Replies: 4
    • Views: 3,085
    12-01-2011, 12:13 PM Go to last post
  35. Which method to compare models with truth?

    Hi all, Edit: First I must say sorry for the ridiculous spelling mistake in the title! I wish I could go back and change 'two' to 'to'. I have...

    Started by seanelvidge‎, 12-06-2011 10:37 AM
    analysis, comparison, models
    • Replies: 4
    • Views: 2,071
    12-06-2011, 11:49 AM Go to last post
  36. How to antilog a regression

    Hi, My excel regression produced the following: Coefficient Constant 6.5804 Log(Unit_Produced) -0.4752 The...

    Started by pcampin‎, 12-10-2011 11:21 AM
    • Replies: 4
    • Views: 9,854
    12-11-2011, 05:12 PM Go to last post
  37. How to pick the better model parameter in this example?

    Let's say the model is fixed (e.g., a linear model where 5 coefficients need to be fit). Denote the parameter (coefficient) vector as \beta. ...

    Started by ColdKing‎, 12-10-2011 12:10 PM
    data, model selection, regression
    • Replies: 4
    • Views: 1,827
    12-10-2011, 03:07 PM Go to last post
  38. Firm Fixed Effects

    In some regressions the the authors control for “firm fixed effects”. What does that mean? What are Firm fixed effects specifically? Are they just...

    Started by JelleJansen‎, 12-14-2011 09:26 AM
    • Replies: 4
    • Views: 11,664
    12-15-2011, 08:22 AM Go to last post
  39. Lack of Fit Test

    Hi, Can someone please help me derive the expression for E(MSLF) -- Expected Value for the means squares lack of fit (MSLF) Thanks.

    Started by nubyra‎, 12-21-2011 02:12 PM
    • Replies: 4
    • Views: 4,225
    12-27-2011, 01:15 AM Go to last post
  40. ridge regression example

    Data Display Row x1 x2 y 1 1 1 2 2 5 4 5 3 5 5 6 4 5 6 6 5 ...

    Started by magicianmagi‎, 01-09-2012 10:08 AM
    • Replies: 4
    • Views: 7,932
    01-11-2012, 01:43 AM Go to last post
  41. Logistic regression (medicine)

    Dear all, I have patients N=104 group1 n=43 with mild form of disease A (A1) group2 n=61 with severe form of disease A (A2) every patient...

    Started by wellfor‎, 01-14-2012 07:36 PM
    • Replies: 4
    • Views: 1,647
    01-15-2012, 05:02 AM Go to last post
  42. 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: 3,247
    01-16-2012, 07:36 PM Go to last post
  43. How to prove E(SSE)=(n-2)singma^2 ???

    I'd like to know to how to prove E(SSE)=(n-2)singma^2 (SSE=Syy-BetaHat1*Sxy) . Ive been workin' on it for many days but still cant figure it out....

    Started by jamerse‎, 01-18-2012 04:17 AM
    • Replies: 4
    • Views: 13,612
    01-19-2012, 10:44 AM Go to last post
  44. Report Interaction Term Coefficients, SE, t, p, as well as the interaction?

    A bit of a basic question: I ran regression analyses to test moderating effects of gender and stress on anxiety. So, DV: Anxiety. IVs:...

    Started by statn00b‎, 01-20-2012 12:15 AM
    • Replies: 4
    • Views: 3,490
    01-23-2012, 05:01 AM Go to last post
  45. R2 vs lack of fit

    Hello: I am working with a multiple regression model where I see a 91% R2 but significant lack of fit with pure error. I also have a slighly...

    Started by need‎, 01-25-2012 01:49 PM
    • Replies: 4
    • Views: 5,525
    01-25-2012, 02:57 PM Go to last post
  46. difference between 2x2-table and binary logistic regression

    Hello, I have to find out what is the (conceptual) difference between the tests. I don't really know what my means. I know they ARE different, but...

    Started by Lychee‎, 01-27-2012 11:42 AM
    • Replies: 4
    • Views: 3,407
    01-27-2012, 01:54 PM Go to last post
  47. 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: 2,243
    02-09-2012, 11:31 PM Go to last post
  48. Interpreting regression analysis results help

    I am trying to analyse some medical data looking at a possible link between various variables (patient age, period on specific medication, medication...

    Started by j_cocker‎, 02-06-2012 06:37 PM
    • Replies: 4
    • Views: 2,193
    02-07-2012, 08:23 PM Go to last post
  49. Stats Help Regression

    Hi, Do you know what kind of regression tests I should run for this and how to run them? Thanks for your help. Attached is the file.

    Started by baller99‎, 02-23-2012 04:40 PM
    • Replies: 4
    • Views: 1,753
    02-23-2012, 06:36 PM Go to last post
  50. Semi-saturated Fixed Effects

    Today my supervisor instructed me to try to use semi-saturated Fixed Effects analysis. I have tried searching for "semi-saturated" and "saturated"...

    Started by Laco‎, 03-01-2012 01:07 PM
    • Replies: 4
    • Views: 2,800
    03-04-2012, 01:15 PM Go to last post
  51. Need help understanding an equality associated with regression analysis

    Hi everyone, I am attempting to understand the implications the equality listed below has in regards to regression models. The equality is...

    Started by phightins530‎, 03-06-2012 02:13 PM
    • Replies: 4
    • Views: 2,156
    03-06-2012, 04:20 PM Go to last post
  52. Multilevel model of school data

    Hi, I have a model I am working with to estimate 6 grade test scores from a sample of students who were in a school district from K-6. I am using...

    Started by lchisesi‎, 03-18-2012 11:17 PM
    independence, multi-level data
    • Replies: 4
    • Views: 1,764
    04-06-2012, 07:17 PM Go to last post
  53. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 4,366
    03-25-2012, 01:03 PM Go to last post
  54. LinReg Assumption on errors ConfIV

    Hi all why is it assumed that the errors e_i are normal distributed in linear regression, see e.g. Seber. What would be the influence e.g. on...

    Started by Jacov‎, 04-07-2012 05:03 AM
    • Replies: 4
    • Views: 2,488
    04-09-2012, 05:17 AM Go to last post
  55. Really stuck with moderated regression...

    I have used a hierarchical regression analysis in SPSS, however the analysis isn't producing any significant interactions :confused: The...

    Started by Psychx‎, 04-24-2012 08:08 AM
    • Replies: 4
    • Views: 2,375
    04-24-2012, 09:29 AM Go to last post
  56. multiple regression and mediators

    Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

    Started by eleanor_rigby‎, 05-01-2012 06:52 AM
    • Replies: 4
    • Views: 3,910
    05-02-2012, 05:57 AM Go to last post
  57. Timeseries: sig. Ljung-box Q, but residuals normally distributed

    Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

    Started by Eyecatcher‎, 05-03-2012 11:02 AM
    exponential smoothing, ljung-box q, timeseries
    • Replies: 4
    • Views: 7,559
    05-03-2012, 12:15 PM Go to last post
  58. Modeling rates, non-normal errors. Alternatives to linear regression

    Hi there, I am trying to fit a rate, that is a response variable whose range is between 0 and 100. Because this variable is both upper and...

    Started by Tomas_M‎, 05-27-2012 12:30 PM
    • Replies: 4
    • Views: 2,242
    05-27-2012, 01:15 PM Go to last post
  59. What tools can we use to solve LR equations to get unknown parameter vector?

    Greetings, Apologies if my explanations are unclear, I am new to data mining coming from business intelligence development area. Let's say we...

    Started by olap‎, 05-10-2012 08:51 AM
    data mining, linear regression, parameter vector
    • Replies: 4
    • Views: 1,818
    05-10-2012, 01:16 PM Go to last post
  60. Coefficient of correlation and forcing to pass origin

    Hello! I don’t understand much about statistics, so forgive me if this is a very basic question :o I’m working with linear regression, forcing...

    Started by MopsaAspom‎, 05-18-2012 10:00 AM
    • Replies: 4
    • Views: 3,862
    05-18-2012, 11:26 AM Go to last post

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