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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. multinomial logit, marginal effects all insignificant!

    Dear users, I am estimating a multinomial logit model. Concerning my coefficients, I find some variables being significant. After estimating the...

    Started by Stevens_Berlin‎, 09-30-2011 06:37 AM
    • Replies: 1
    • Views: 2,533
    01-25-2012, 04:49 PM Go to last post
  2. Collinearity Among Categorical Variables in Regression

    Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

    Started by jastingo‎, 01-21-2012 05:40 PM
    • Replies: 6
    • Views: 24,244
    01-25-2012, 03:52 PM Go to last post
  3. 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: 1,703
    01-25-2012, 02:57 PM Go to last post
  4. Converting Group Centroids into Original Measurement Units in DFA

    I used SPSS to perform a discriminant function analysis on leg length which I am using to differentiate males and females in my sample. New measures...

    Started by ckevinbarrett‎, 01-25-2012 12:34 PM
    centroids, cut-off, dfa, discriminant, mahalanobis
    • Replies: 2
    • Views: 1,167
    01-25-2012, 12:54 PM Go to last post
  5. non zero mean gaussian error in least squares

    Dear all, I have the classic Least squares problem Ax=b, but with Gaussian noise at both A and b. I found out that total least squares can be...

    Started by samweckx‎, 01-25-2012 11:29 AM
    • Replies: 0
    • Views: 1,419
    01-25-2012, 11:29 AM Go to last post
  6. IV probit and Ivreg

    Hello, When I use ivreg in Stata and cluster standard errors my results show that the independent variable is significant. However, when I use...

    Started by carmen256‎, 01-23-2012 02:31 PM
    probit, regression analysis, results
    • Replies: 0
    • Views: 1,658
    01-23-2012, 02:31 PM Go to last post
  7. Polynomial Regression interpretation

    I have 2 questions that I need help interpreting: 1. Y = 47.31051 + 1.06914(X) - .01383(X^2) Because X is used twice (and one of them is a...

    Started by lancearmstrong1313‎, 01-23-2012 10:43 AM
    • Replies: 2
    • Views: 9,198
    01-23-2012, 12:16 PM Go to last post
  8. 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: 2,362
    01-23-2012, 05:01 AM Go to last post
  9. Relationship between correlation matrix and R square

    Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

    Started by liamplayt‎, 01-21-2012 11:39 PM
    r squared
    • Replies: 2
    • Views: 4,489
    01-22-2012, 09:54 AM Go to last post
  10. Logistic Regression: Testing for interaction effects with many covariates

    Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

    Started by makadiwa‎, 01-20-2012 04:22 AM
    interaction, logit, stata
    • Replies: 3
    • Views: 6,837
    01-20-2012, 01:01 PM Go to last post
  11. Variance Extracted and Multicollinearity in Structural Equation Model

    Hello, I am a new user here, and I am quite in need of help with regards to statistical problems. :) I really appreciate it if anyone can help me. ...

    Started by Iori‎, 01-20-2012 12:56 PM
    ave, lisrel, multicollinearity, sem, variance extracted
    • Replies: 0
    • Views: 3,334
    01-20-2012, 12:56 PM Go to last post
  12. Post hoc in ANCOVA

    I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

    Started by Oritteropus‎, 01-18-2012 05:39 AM
    • Replies: 5
    • Views: 4,194
    01-20-2012, 07:59 AM Go to last post
  13. Negative linear regression (time value)

    hey all, I'm working on a basic program for calculating the time remaining as a battery of a device runs down from 100% (full) to 0% (empty). ...

    Started by diryfishtank‎, 01-19-2012 04:42 AM
    linear regression, negative, time
    • Replies: 1
    • Views: 829
    01-19-2012, 12:57 PM Go to last post
  14. 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: 7,188
    01-19-2012, 10:44 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: 1,819
    01-19-2012, 10:06 AM Go to last post
  16. Enter the product term of 2 variables in linear regression?

    How can you enter the product term of 2 variables in linear regression? One is gender (categorical) and the other one is continous (Scored 1-200). ...

    Started by statn00b‎, 01-18-2012 01:11 PM
    • Replies: 1
    • Views: 1,265
    01-19-2012, 04:15 AM Go to last post
  17. moderator as a categorical variable -- really desperate please help!!!!

    1. how do you conduct moderation analysis in SPSS when the moderator is a categorical variable (3 levels represented respectively by +1 (active...

    Started by peggy217‎, 01-18-2012 12:23 PM
    • Replies: 2
    • Views: 1,591
    01-19-2012, 12:29 AM Go to last post
  18. Iv probit

    Hi, Is there a procedure to estimate a probit model in SAS using instrumental variables, like the IVPROBIT in STATA? Thanks!

    Started by SBODILSEN‎, 01-18-2012 07:13 AM
    • Replies: 2
    • Views: 2,005
    01-18-2012, 11:26 PM Go to last post
  19. Logistic regression problem

    Hi, I'm experiencing difficulties with understanding my results despite active googling, and i'd be really grateful, if someone could help me. ...

    Started by kati‎, 01-18-2012 08:13 PM
    • Replies: 5
    • Views: 1,509
    01-18-2012, 11:01 PM Go to last post
  20. Assumptions of Linear Regression and Time Series

    Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

    Started by cozgenc‎, 01-18-2012 08:20 AM
    • Replies: 1
    • Views: 5,616
    01-18-2012, 12:05 PM Go to last post
  21. Am i understanding Regression analysis? Theory question

    Lets say, I have a list of all the hall of fame outfielders in MLB history. Along with data on, fielding ability, OBP, etc. Can I set up a...

    Started by morid22‎, 01-17-2012 03:05 PM
    • Replies: 1
    • Views: 1,050
    01-17-2012, 04:01 PM Go to last post
  22. IV results interpretation

    Hello, I have an endougenous variable x and an instrument for it, variable z. The instrument is (significantly) negatively related to x. My...

    Started by carmen256‎, 01-17-2012 07:24 AM
    instrumental variables, interpretation, output
    • Replies: 0
    • Views: 815
    01-17-2012, 07:24 AM Go to last post
  23. stats var

    The message you have entered is too short. Please lengthen your message to at least 10 characters.

    Started by matlabber‎, 01-16-2012 07:46 PM
    • Replies: 1
    • Views: 918
    01-16-2012, 09:29 PM Go to last post
  24. 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: 1,285
    01-16-2012, 07:36 PM Go to last post
  25. unable to make model Hessian positive definite - help!

    Hello all, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which...

    Started by rtoaff‎, 01-16-2012 10:10 AM
    covariance structure, hessian positive definite, proc mixed, repeated measures
    • Replies: 0
    • Views: 3,209
    01-16-2012, 10:10 AM Go to last post
  26. How to Guard Against Negative Probabilities in Multilevel Proportional Odds Model?

    In SAS, it provides a "bound statement" to prevent negative probabilities for multilevel proportional odds model. How can I guarantee postive...

    Started by tonymtc‎, 01-15-2012 10:35 PM
    • Replies: 0
    • Views: 720
    01-15-2012, 10:35 PM Go to last post
  27. 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: 1,462
    01-15-2012, 07:05 AM Go to last post
  28. 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: 963
    01-15-2012, 05:02 AM Go to last post
  29. categorical variables in proc logistic

    Hi together, i'm using proc logistic to optimize a model for closures on an insurance in dependence of several categorical variables. Due to...

    Started by manito‎, 01-12-2012 06:16 AM
    • Replies: 2
    • Views: 1,322
    01-13-2012, 08:05 AM Go to last post
  30. GARCH errors

    Hey, I wonder if you couldn't point me in the right direction on this. What I'm basically trying to do is replicate the method used in this paper:...

    Started by Sands‎, 01-13-2012 03:21 AM
    • Replies: 0
    • Views: 819
    01-13-2012, 03:21 AM Go to last post
  31. Standard error of coefficients for ols vs regression through the origin

    Hi guys, Thought I'd throw this out there officially since I'm having some trouble. I'm under the current impression that if you set up a...

    Started by Link‎, 01-12-2012 06:42 PM
    • Replies: 9
    • Views: 3,336
    01-12-2012, 08:05 PM Go to last post
  32. confidence intervals for linear regression

    Hi, newbie here, so please forgive the bad terminology. I started with ten years of historical data. I used Excel to give me a linear trendline and...

    Started by kins80‎, 01-10-2012 04:12 PM
    confidence interval, linear regression, trend analysis
    • Replies: 3
    • Views: 2,231
    01-11-2012, 09:13 PM Go to last post
  33. potential heteroskedasticity & autocorrelation problem with pooled cross-section data

    hello 1) my data: i have collected a few thousand property transactions over the last 15 years. for each transaction i have got the price and the...

    Started by czeiny‎, 01-11-2012 02:16 PM
    • Replies: 2
    • Views: 2,164
    01-11-2012, 03:56 PM Go to last post
  34. Passing-Pablok Regression for clinical unlike method validation

    Will anyone take a look at this model and help interpret it for me. (Attachment) I need to show analyte correlation between two different...

    Started by cboggs‎, 01-11-2012 03:05 PM
    • Replies: 0
    • Views: 928
    01-11-2012, 03:05 PM Go to last post
  35. Simple Question Seasonal Autoregressive Model

    Hi, I hope I'm posting this in an appropriate place. It's not exactly linear regression. If you have a seasonal moving average model like...

    Started by Time Serious‎, 01-10-2012 05:58 AM
    arima, auto-regressive, forecasting, seasonal, time series
    • Replies: 10
    • Views: 2,197
    01-11-2012, 02:27 PM Go to last post
  36. 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: 4,519
    01-11-2012, 01:43 AM Go to last post
  37. [SOLVED] Logistic Regression - Confidence Intervals

    Hi I'm running a logistig regression in SPSS 16.0 and have come across the following issue: when testing for different confidence intervals (95%,...

    Started by pcruz‎, 01-09-2012 10:20 AM
    • Replies: 3
    • Views: 965
    01-10-2012, 12:27 PM Go to last post
  38. confidence intervals in logistic regression with clusters

    Hi, this is probably a simple question but i hoped someone could explain it to me, I have carried out a logistic regression model assesing the...

    Started by nicklt‎, 01-10-2012 06:06 AM
    • Replies: 0
    • Views: 620
    01-10-2012, 06:06 AM Go to last post
  39. (Li'l) theoretical question about correlations in regression...

    hey y'all people!??! how're y'all doooin' huh? i hope everyone had the most awesomest holidays!!! heh. so... who else is feelin' the pinch this...

    Started by spunky‎, 01-08-2012 02:09 PM
    • Replies: 9
    • Views: 1,674
    01-09-2012, 02:44 AM Go to last post
  40. how to intepret this result for my thesis

    Please can anyone assist me on how to interpret the attached t-test result. Thank you.

    Started by adibulileka‎, 01-08-2012 11:35 PM
    • Replies: 1
    • Views: 837
    01-09-2012, 12:07 AM Go to last post
  41. Fitting a model with Bernoulli/Binomially distributed data

    I am used to fitting data to estimate parameters in a model f(x,A) where x is my data point and A is the parameter(s) to be determined. To achieve...

    Started by sparticle10‎, 01-07-2012 08:36 PM
    bernoulli, maximum likehood, regresion
    • Replies: 6
    • Views: 1,452
    01-08-2012, 02:44 PM Go to last post
  42. Can I use regression with a variable that is ordinal?

    I hope that I am posting this in the right place- and I apologize if this has been addressed. I tried to look for it but couldn't find a similar...

    Started by psychstudent11‎, 01-05-2012 10:14 PM
    • Replies: 1
    • Views: 724
    01-05-2012, 11:37 PM Go to last post
  43. Question on regression assumptions interpretation

    Hi, I am trying to interpret the plot below. Would it be possible to receive some feedback on my interpretations, as to whether they are correct...

    Started by regression_is_cool‎, 01-03-2012 10:40 AM
    • Replies: 12
    • Views: 1,384
    01-03-2012, 05:50 PM Go to last post
  44. Simple Regression - Prediction Interval

    Hi, My text describes a prediction interval as being a t-distribution with n-2 d.o.f. In the chapter end questions, I see that they used 1.96...

    Started by pcampin‎, 01-03-2012 12:10 PM
    • Replies: 2
    • Views: 1,006
    01-03-2012, 03:58 PM Go to last post
  45. Logistic regression (firm-level and country-level variables)

    I am new to logistic regression and wonder how I can combine firm-level variables and country-level variables into the same regression. For the...

    Started by lucas111‎, 01-02-2012 11:39 AM
    logistic regression
    • Replies: 10
    • Views: 1,702
    01-02-2012, 10:45 PM Go to last post
  46. Polynomial regression...how to solve a complex quadratic equation

    Hi, The regression in question is: y= 216.44 -109.37X + 25.969 X^2 - 1.7699 X^3 where y = strength of strand board and X = amount of glue used...

    Started by pcampin‎, 01-02-2012 01:26 PM
    • Replies: 1
    • Views: 2,628
    01-02-2012, 01:30 PM Go to last post
  47. Polynomial Regression

    Hi, Could you please tell me why it is common to square the independent variables. I ask because I made a scatter plot of the squared data and...

    Started by pcampin‎, 01-02-2012 11:40 AM
    • Replies: 2
    • Views: 808
    01-02-2012, 12:26 PM Go to last post
  48. Proportional Odds Models Programming Problem Using S-Plus

    For ordinal logistic regression (proportional odds model), I need to define the following: For subject i, let (yi1, ..., yic) be binary...

    Started by tonymtc‎, 01-02-2012 02:04 AM
    • Replies: 0
    • Views: 590
    01-02-2012, 02:04 AM Go to last post
  49. interpreting log transformed co-effients in linear regression?

    Hello, I have 1 continuous dependent and 1 predictor variable that I've logarithmically transformed to normalise the data and their residuals for...

    Started by orangecrush‎, 12-30-2011 10:52 AM
    • Replies: 6
    • Views: 2,482
    12-31-2011, 12:03 PM Go to last post
  50. Using mixed-effects models

    Hello, I have been asking a series of questions within this forum and have had wonderful advice given. However as my statistics knowledge is...

    Started by Dragonwalker‎, 12-30-2011 01:18 PM
    • Replies: 2
    • Views: 726
    12-30-2011, 04:44 PM Go to last post
  51. non-integers in poisson GLM

    Great forums, thank you to everyone who contributes to them. My question is regarding non-integer values from some data I collected on parrots...

    Started by lucy‎, 12-30-2011 12:45 PM
    • Replies: 7
    • Views: 10,612
    12-30-2011, 01:11 PM Go to last post
  52. 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: 2,310
    12-27-2011, 01:15 AM Go to last post
  53. Recoding inverted variables

    Alright guys, so I conducted a multiregression analysis using SPSS and got the following result: STFDEM = 0,685 - 0,116POLINTR + 0,074POLDCS +...

    Started by X-Offender‎, 12-26-2011 06:25 PM
    • Replies: 0
    • Views: 813
    12-26-2011, 06:25 PM Go to last post
  54. P-value in regression analysis

    How much should a p-value in a regression model be for the related variable to be considered insignificant?

    Started by X-Offender‎, 12-15-2011 10:04 AM
    • Replies: 6
    • Views: 10,552
    12-25-2011, 02:33 PM Go to last post
  55. Correlation between reaction time (RT) and accuracy.

    In a two choice task, for each participant, I want to show that the faster is RT, the higher is the probability for incorrect response. Is it...

    Started by Izek‎, 12-24-2011 09:38 AM
    • Replies: 3
    • Views: 1,939
    12-24-2011, 01:23 PM Go to last post
  56. Control variable correlated with binary treatment variable

    This question regards a social program evaluation which involves participants receiving a binary treatment that they self-select into. Some of these...

    Started by agsalomon‎, 12-24-2011 12:16 AM
    • Replies: 0
    • Views: 1,247
    12-24-2011, 12:16 AM Go to last post
  57. Logit coefficients interpretation...

    Logistic regression Number of obs = 1315 LR chi2(32) = ...

    Started by jesse2‎, 12-21-2011 11:49 PM
    • Replies: 2
    • Views: 4,298
    12-22-2011, 05:37 AM Go to last post
  58. 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: 1,729
    12-21-2011, 11:06 AM Go to last post
  59. Stepwise selection and dummy variables

    Hi Can you do forward or backward selection if there are categorical variables involved? If you can, how can it be done? Is there a way to...

    Started by Ipinho100‎, 12-20-2011 10:19 AM
    • Replies: 9
    • Views: 3,138
    12-21-2011, 09:38 AM Go to last post
  60. Exclude intercept in logistic regression?

    I would like some help on the subject whether to include the intercept term or not in a logistic regression. I have read that some people say that...

    Started by jockem‎, 12-20-2011 06:25 AM
    • Replies: 7
    • Views: 14,186
    12-21-2011, 04:00 AM Go to last post

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