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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Collinearity in Logistic Regression

    If my independent variables are correlated in Linear Regression, I can first, check it using VIF, and solve it (PLS, other ways). What do I do if...

    Started by WeeG‎, 08-19-2010 04:28 AM
    • Replies: 8
    • Views: 26,941
    08-24-2010, 01:50 AM Go to last post
  2. need help choosing the right model

    following another thread I opened, I need your advice to choose the correct logistic model. I had 8 IV's, I ran 8 univariate models (used the method...

    Started by WeeG‎, 08-24-2010 06:57 AM
    • Replies: 0
    • Views: 3,099
    08-24-2010, 06:57 AM Go to last post
  3. caculation of Type III ss?

    How can I calculate the missing Type III ss for one variable and mean square, If I got the Type I ss and means square for all variables and Type III...

    Started by medsonia‎, 08-25-2010 06:08 PM
    • Replies: 0
    • Views: 2,097
    08-25-2010, 06:08 PM Go to last post
  4. to trust AIC (non-full model) or slope (full model)

    The purpose to run regressions for butterfly richness again 5 environmental variables is to show the importance rank of the independent variables...

    Started by helenekuo‎, 08-17-2010 06:21 AM
    • Replies: 1
    • Views: 2,453
    08-26-2010, 03:41 PM Go to last post
  5. Negative fitted values

    Hi, I am trying to imput the prices of houses in a database using information on the carachteristics of the houses and a database in which i have...

    Started by Laurie‎, 08-20-2010 09:48 PM
    • Replies: 2
    • Views: 5,184
    08-26-2010, 08:20 PM Go to last post
  6. Dummy regression for graded paired comparison

    Hi all, I'm trying to create a dummy regression for a conjoint analysis with graded paired comparison. here is an example of one paired...

    Started by caro23‎, 08-27-2010 03:09 AM
    • Replies: 0
    • Views: 2,783
    08-27-2010, 03:09 AM Go to last post
  7. 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: 11,291
    08-27-2010, 07:50 AM Go to last post
  8. Puzzling Regression issue.

    First post :D Wondering if anyone could lend a hand, I can't figure this out. When I perform two separate regression analyses ('promotion_A'...

    Started by Solaris‎, 08-27-2010 04:27 AM
    • Replies: 1
    • Views: 2,843
    08-27-2010, 01:49 PM Go to last post
  9. Ordinal Regression: Test of Parallel Lines

    Hi, I am trying to fit a model by using ordinal regression. I have got two co-variates, and one factor with four groups. The dependent variable...

    Started by Lotte‎, 08-26-2010 07:06 PM
    • Replies: 3
    • Views: 8,218
    08-27-2010, 09:47 PM Go to last post
  10. regression with covariate

    I want to develop a relationship between water temperature released at a dam and the volume of water stored in the reservoir behind the dam. But I...

    Started by Humboldt‎, 08-27-2010 02:49 PM
    • Replies: 2
    • Views: 2,584
    08-28-2010, 10:32 AM Go to last post
  11. Varying coefficient problem with weighted regression - DOES IT MAKE SENSE?

    Dear List, Please consider first a toy example. Suppose we have a large norming database with three variables, representing raw score on a...

    Started by tdenes‎, 08-30-2010 10:17 AM
    • Replies: 0
    • Views: 2,341
    08-30-2010, 10:17 AM Go to last post
  12. Differences Between ANOVA and multiple regression

    What are the differences between ANOVA and multiple regression? If I want to figure out if there exist impacts of one variable on the other, which...

    Started by lztoby‎, 08-30-2010 09:26 PM
    • Replies: 1
    • Views: 4,306
    08-30-2010, 09:58 PM Go to last post
  13. 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: 1,732
    09-01-2010, 02:25 PM Go to last post
  14. Negative Binomial Regression- General Question

    If I have an independent variable (X1) that only takes integer values, why do I log that in the regression model? (My dependent variable (Y) is also...

    Started by tiab2005‎, 09-02-2010 10:14 AM
    • Replies: 1
    • Views: 2,783
    09-02-2010, 10:52 AM Go to last post
  15. Need help urgently

    I need to run a test to run if a relationship is significant. Hyphothesis H1: Entertainment of the advertisement on web is positively associated...

    Started by Kate10‎, 08-30-2010 02:36 PM
    • Replies: 14
    • Views: 5,254
    09-03-2010, 01:35 PM Go to last post
  16. Multiple vs univariate regression

    Hi, I was wondering what are the pitfalls of fitting multiple univariate regression equations to a response instead of fitting all independent...

    Started by jonG‎, 09-03-2010 05:34 PM
    • Replies: 1
    • Views: 3,391
    09-03-2010, 05:47 PM Go to last post
  17. Question Regression Analysis Help

    Hi All, first post here, glad to be part of this forum. After surveying my population, I am currently experimenting what factors (about 10...

    Started by MohammedT‎, 09-04-2010 12:53 PM
    • Replies: 4
    • Views: 2,944
    09-04-2010, 04:36 PM Go to last post

    Hi guys, I have a small question. I ran a MANOVA model, with 4 DV's and 1 IV with 2 categories. I got a non significant result, with P. Value of...

    Started by WeeG‎, 09-06-2010 02:55 PM
    • Replies: 9
    • Views: 13,024
    09-07-2010, 03:56 AM Go to last post
  19. BOX-COX transformation - Correct method

    Dear All, I fitted a quadratic model to a set of data. I am trying to apply the box-cox transformation to check if my data should be transformed....

    Started by Clovis‎, 08-05-2010 06:31 AM
    • Replies: 2
    • Views: 10,298
    09-08-2010, 09:44 AM Go to last post
  20. Need help badly!

    You have the ramp-servicing contract for a midsize car wash. For wash workers you use predominantly part time workers, all of whom have sufficient...

    Started by charterpilot‎, 09-08-2010 10:46 PM
    • Replies: 4
    • Views: 4,478
    09-09-2010, 03:49 PM Go to last post
  21. standardizing residuals

    Hi All, I'd like to standardize residuals. Can anybody tell me the formula to standardize to mean 0 and standard deviation 1? I also do not...

    Started by cincan‎, 09-09-2010 04:05 PM
    • Replies: 3
    • Views: 5,541
    09-10-2010, 04:35 AM Go to last post
  22. Time Series Analysis with lags and non temporally consecutive values

    This is what i'm trying to do. Ive got a set of news surprise data (announced value-forecast) at the times of release. For example, I have 12 GDP...

    Started by CharlesOG‎, 09-12-2010 07:38 PM
    • Replies: 0
    • Views: 2,707
    09-12-2010, 07:38 PM Go to last post
  23. "No Observations"

    Hi, I was hoping someone might be able to help solve this problem. The values are all formatted as numeric. I'm regressing news announcements on...

    Started by CharlesOG‎, 09-13-2010 05:46 AM
    • Replies: 1
    • Views: 2,466
    09-13-2010, 07:57 AM Go to last post
  24. Participant ID - Categorical?

    Hi all, I'm performing a Binary Logistic Regression on data from human subjects. I want to ensure that the effect of independent variables is...

    Started by blastStu‎, 09-13-2010 09:44 AM
    • Replies: 0
    • Views: 3,971
    09-13-2010, 09:44 AM Go to last post
  25. Constant Variable

    Hi folks, I was wondering if you could help me understand a problem I have with a regression. Basically, SPSS excludes one of my variables...

    Started by blastStu‎, 09-13-2010 03:58 AM
    • Replies: 2
    • Views: 17,528
    09-13-2010, 12:38 PM Go to last post
  26. Comparing model fits of non nested models

    Dear all, I am a student in Sociology at the University of Amsterdam and currently working on a paper on which I got stuck. Let me briefly...

    Started by thaiz‎, 09-14-2010 02:56 AM
    • Replies: 0
    • Views: 3,898
    09-14-2010, 02:56 AM Go to last post
  27. Four-way interaction in linear regression

    Dear all, I have 4 independent variables, and I want to check their combined and interrelated effects on 1 dependent variable (thus 1 y and 4...

    Started by paul de boer‎, 09-08-2010 02:44 PM
    • Replies: 2
    • Views: 9,798
    09-14-2010, 01:33 PM Go to last post
  28. Low R-squared, but my variables fit expectations

    So I ran a regression on 3 different sets of data estimation techniques versus actual survey data. The dependent variable was the non-survey...

    Started by dontpunkme‎, 09-10-2010 09:40 PM
    • Replies: 1
    • Views: 13,647
    09-16-2010, 10:55 AM Go to last post
  29. Standard error of regression

    I am writing a robust regression algorith in Python and using the linregress method from SciPy/NumPy. linregress returns the b0, b1, r^2, p_val, and...

    Started by strimp099‎, 09-16-2010 12:18 PM
    • Replies: 2
    • Views: 6,184
    09-16-2010, 02:35 PM Go to last post
  30. How do i create "nice" prediction hyperbola?

    I would like to create a nice prediction hyperbola in my regression analysis, at this moment i am only getting some rather ugly ones and only where i...

    Started by thedreamshaper‎, 09-16-2010 02:28 PM
    • Replies: 3
    • Views: 3,539
    09-16-2010, 03:55 PM Go to last post
  31. disattenuated correlations

    Objective: a guess about the actual correlations between two variables based on correlations between somewhat noisy variable estimates. The variable...

    Started by Per‎, 09-18-2010 01:39 AM
    • Replies: 0
    • Views: 4,040
    09-18-2010, 01:39 AM Go to last post
  32. Descriptive research and regression analysis?

    Please pardon my ignorance...can I use multiple regression analysis in a descriptive research design to answer my hypotheses? If not, can anyone...

    Started by reakhavok‎, 09-18-2010 01:53 PM
    • Replies: 4
    • Views: 8,348
    09-19-2010, 01:11 PM Go to last post
  33. multivarient nonlinear regression in SPSS

    is there are way of doing this in SPSS? I have looked around and come to a blank... I need to derive an equation to describe the (most likely...

    Started by E_J‎, 09-21-2010 08:58 AM
    • Replies: 0
    • Views: 3,852
    09-21-2010, 08:58 AM Go to last post
  34. Plotting output from logistic regression???

    I ran a quasi-likelihood logistic regression using S-plus and have a question about how to plot and interpret the results. How can I construct...

    Started by Boxor‎, 09-21-2010 05:35 PM
    • Replies: 0
    • Views: 3,837
    09-21-2010, 05:35 PM Go to last post
  35. Testing IIA in MNLM with Hausman-McFadden

    Dear all, I'm having some problems with the IIA property violation test of Hausman McFadden. I estimated two MNL models based on 3 predictors:...

    Started by Roel‎, 09-22-2010 08:35 AM
    • Replies: 0
    • Views: 3,114
    09-22-2010, 08:35 AM Go to last post
  36. Question Using Odd values for variable selection in logistic regression

    Hello, I have a question about independent variables selection when a logistic regression is used as classification method. Is it an acceptable or...

    Started by Ziyad‎, 09-22-2010 12:05 PM
    • Replies: 0
    • Views: 2,650
    09-22-2010, 12:05 PM Go to last post
  37. 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: 12,889
    09-23-2010, 04:43 PM Go to last post
  38. Help with VAR, SVAR model

    Hi, I have to plot impulse response function for my research paper and I have never studied vector autoregressive models. So I am hoping someone...

    Started by syedhussain84‎, 09-23-2010 06:04 PM
    • Replies: 0
    • Views: 2,540
    09-23-2010, 06:04 PM Go to last post
  39. Interpreting an order logit

    This isn't my homework, but was acctually meant for my blog. I had planned on running the ordered logit models, running predicted probabilities and...

    Started by amathew‎, 09-23-2010 07:33 PM
    • Replies: 0
    • Views: 2,251
    09-23-2010, 07:33 PM Go to last post
  40. cox regression and change

    I'm no statistician, but a porgrammeur. I have some statistics during my study, but is not really one of my stektste points. 'm Trying to calculate...

    Started by Zaatlob‎, 09-24-2010 09:27 AM
    • Replies: 0
    • Views: 2,165
    09-24-2010, 09:27 AM Go to last post
  41. polytomous regression - help obtaining p for heterogeneity

    I am using polytomous (aka multinomial) logistic regression to analyze some data. My outcome/dependent variable is nominal (unordered) with 4...

    Started by Stuart‎, 09-21-2010 04:23 PM
    • Replies: 1
    • Views: 4,973
    09-25-2010, 06:58 PM Go to last post
  42. Var(Y_knot_Hat)

    Hello all, I need a little help with this: Show Var(Y_knot_Hat) = Sigma^2 * (1/n + (x_knot - x_bar)^2 / Sxx) Start with Y_knot_hat = b_knot...

    Started by floriandotti‎, 09-30-2010 01:07 AM
    • Replies: 5
    • Views: 4,046
    09-30-2010, 01:07 PM Go to last post
  43. theory proofs

    Hi, I am doing a study guide for my stat test coming up, and got stuck on 3 proofs. They seem a bit confusing to me, and I just keep going in circles...

    Started by lilfish08‎, 09-30-2010 02:29 PM
    • Replies: 1
    • Views: 4,057
    09-30-2010, 04:09 PM Go to last post
  44. Logistic regression with dependent variables

    Dear All I'm trying to perform logistic regression to determine risk factors for retinopathy of prematurity (ROP). The outcome is binary 1=...

    Started by SiBorg‎, 10-02-2010 04:47 AM
    • Replies: 4
    • Views: 5,741
    10-06-2010, 06:35 PM Go to last post
  45. is there a non parametric alternative to multiple linear regression?

    Hi all, I would like to know is there a non parametric alternative to multiple linear regression? when I google the quesion I get a lot of info...

    Started by David Williams‎, 09-21-2010 11:25 AM
    • Replies: 7
    • Views: 27,795
    10-07-2010, 03:37 PM Go to last post
  46. bootstrap correlation

    Hi, I am wondering if is it correct to use bootstrap methods to get an estimate of correlation coefficient (Pearson) when data violate some of the...

    Started by gianmarco‎, 10-02-2010 01:40 AM
    • Replies: 2
    • Views: 5,599
    10-08-2010, 02:09 AM Go to last post
  47. Logistic regression. biological significance of a mathematical model quadratic term.

    See if anybody can help me understand something, as I am a bit confused. It is regarding the biological significance of a mathematical model...

    Started by patxarana‎, 10-11-2010 05:30 AM
    • Replies: 2
    • Views: 4,437
    10-11-2010, 07:15 AM Go to last post
  48. significant r but assumptions not met

    Dear All, issue here stems from the one discussed in a previous post of mine (http://talkstats.com/showthread.php?t=13844). I have a dataset...

    Started by gianmarco‎, 10-11-2010 05:32 AM
    • Replies: 2
    • Views: 2,536
    10-11-2010, 10:01 AM Go to last post
  49. Interpolation

    Hello. Two questions: First, what would be the most suitable method for interpolation where the data is: 1. Mostly increasing with an...

    Started by Klesti‎, 10-11-2010 01:36 PM
    • Replies: 0
    • Views: 1,999
    10-11-2010, 01:36 PM Go to last post
  50. Significant Correlations - No Sig Beta Weight

    Hi guys, I'm hoping that someone can clear up my confused state of mind...:( I have conducted a standard MRA and my problem is that even though...

    Started by StormSurfer‎, 10-10-2010 10:54 PM
    • Replies: 2
    • Views: 5,053
    10-11-2010, 05:20 PM Go to last post
  51. 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: 3,159
    10-12-2010, 04:45 AM Go to last post
  52. Method to calculate the most accurate method of prediction

    Hi, this is my first post, and I'm entirely self taught re statistics, so go easy on me. :) I want to calculate which of several prediction...

    Started by joshAU‎, 10-12-2010 04:30 AM
    • Replies: 1
    • Views: 6,102
    10-12-2010, 01:04 PM Go to last post
  53. 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: 6,707
    10-12-2010, 01:07 PM Go to last post
  54. Meaning of Logarithmic Trend Line

    Hello Everyone I was just curious as to the meaning of the slop in an Excel logarithmic trendline. For example, y = -0.039ln(x) + 1.6792, where x...

    Started by skohon‎, 10-13-2010 10:45 AM
    • Replies: 0
    • Views: 5,175
    10-13-2010, 10:45 AM Go to last post
  55. Linear Regression for Traffic Data

    Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

    Started by dramachandran‎, 10-11-2010 06:46 PM
    • Replies: 3
    • Views: 4,731
    10-13-2010, 11:25 AM Go to last post
  56. Correlation and Regression Assignment Using BRFSS

    "For this assignment you must collect some state-level variable of your choice and merge it to the BRFSS individual-level data (matching by state...

    Started by littlebee‎, 10-13-2010 09:28 PM
    • Replies: 0
    • Views: 2,708
    10-13-2010, 09:28 PM Go to last post
  57. I cannot calculate covariance ratio, please help me

    My results of covariance ratio (influence statistic) is always different as for example the SPSS output. I donít know where is my failure. Could...

    Started by Palepoli‎, 10-14-2010 03:09 PM
    • Replies: 0
    • Views: 3,872
    10-14-2010, 03:09 PM Go to last post
  58. collinearity and Heteroscedasticity in bivariate probit model

    Hi, all I run a bivariate probit regression, and I am not specialized in statistics and I dont know how to check collinearity and...

    Started by momo‎, 10-14-2010 03:32 PM
    • Replies: 0
    • Views: 5,671
    10-14-2010, 03:32 PM Go to last post
  59. Red face Stupid Question: Help This Noob with Parking

    :o Hi, I have been knocking my head against the wall of statistics (so to speak) for uncounted hours and just can't figure this out. I cannot...

    Started by meinhaj‎, 10-15-2010 11:38 AM
    • Replies: 1
    • Views: 3,820
    10-15-2010, 11:53 AM Go to last post
  60. Spurious or not? a little help for a newbie

    Hi to all, I am relatively new to statistics and I try to do my best. I will appreciate any helpful inputs form you. First, I had to generate a...

    Started by Neptune‎, 10-17-2010 10:57 AM
    • Replies: 0
    • Views: 2,114
    10-17-2010, 10:57 AM Go to last post

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