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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. two ANOVAs, which to use?

    Hypothetical: you have ANOVA tables from two regressions. One is regressed on more variables than the other. The one with more variables, has a low...

    Started by el_presidente_psych‎, 12-12-2011 10:16 AM
    • Replies: 6
    • Views: 2,530
    12-13-2011, 10:12 AM Go to last post
  2. Multivariate regression analysis

    Hi guys, I have a conceptual question. I was taught that when building a multivariate regression analysis, let's say y=b0+b1X1+b2X2, I interpret...

    Started by NN_STAT‎, 12-14-2011 02:35 AM
    • Replies: 2
    • Views: 2,074
    12-14-2011, 08:42 AM Go to last post
  3. Regression when outcome is a rank?

    Is there a particular kind of regression if the outcome is a ranking? I'm wondering if my best bet would be to use the central limit theorem and use...

    Started by zeloc‎, 12-07-2011 08:06 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 20,090
    12-14-2011, 02:36 PM Go to last post
  4. 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: 11,703
    12-15-2011, 08:22 AM Go to last post
  5. (easy?) Partial slope coefficients question...

    Slopes from auxiliary regressions where each variable is regressed on one of the others. Variables have all been mean-deviated so the constant terms...

    Started by jesse2‎, 12-15-2011 02:25 PM
    • Replies: 0
    • Views: 2,772
    12-15-2011, 02:25 PM Go to last post
  6. Not sure what kind of regression to run here, plus extra ?'s

    Hey there. Frustrated grad student who's never been good at math here. :P Suffering through a final project, could use some input. We're using...

    Started by chirs3‎, 12-17-2011 08:43 AM
    • Replies: 0
    • Views: 1,395
    12-17-2011, 08:43 AM Go to last post
  7. dummy varibles

    i have some data where i am trying to see if there is any salarie discrimination in gender between men and women do i need to make a dummy for...

    Started by diesel20056‎, 12-18-2011 03:09 PM
    • Replies: 2
    • Views: 1,882
    12-18-2011, 04:39 PM Go to last post
  8. Choosing predictor variables to use in multiple linear regression models

    I want to figure out what combination (both individual variables and interactions, if any) of independent variables predict my dependent variable....

    Started by TreeMan13‎, 12-18-2011 10:08 PM
    • Replies: 2
    • Views: 8,840
    12-18-2011, 11:09 PM Go to last post
  9. detecting a variance trend in random effects

    Greetings I have a measurements on grouped individuals. There are approximately 100 groups, and approximately 500 individuals per group, with...

    Started by PSellaz‎, 12-19-2011 02:46 PM
    epidemiology, mixed effects models, multi-level data
    • Replies: 0
    • Views: 1,839
    12-19-2011, 02:46 PM Go to last post
  10. Partialling out covariates

    Hi, I have a situation where I have Y_it = a_i + dT_it + X'_itB + e_it T is multi-valued and exogenous. It is correlated with some of the...

    Started by andrewcd‎, 12-20-2011 10:53 AM
    • Replies: 1
    • Views: 3,312
    12-20-2011, 05:18 PM Go to last post
  11. 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: 22,167
    12-21-2011, 04:00 AM Go to last post
  12. 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: 7,215
    12-21-2011, 09:38 AM Go to last post
  13. 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: 3,298
    12-21-2011, 11:06 AM Go to last post
  14. Logit coefficients interpretation...

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

    Started by jesse2‎, 12-21-2011 11:49 PM
    • Replies: 2
    • Views: 5,784
    12-22-2011, 05:37 AM Go to last post
  15. 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: 2,021
    12-24-2011, 12:16 AM Go to last post
  16. 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: 4,080
    12-24-2011, 01:23 PM Go to last post
  17. 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: 13,615
    12-25-2011, 02:33 PM Go to last post
  18. 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: 1,577
    12-26-2011, 06:25 PM Go to last post
  19. 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: 4,253
    12-27-2011, 01:15 AM Go to last post
  20. 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: 15,225
    12-30-2011, 01:11 PM Go to last post
  21. 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: 1,874
    12-30-2011, 04:44 PM Go to last post
  22. 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: 3,755
    12-31-2011, 12:03 PM Go to last post
  23. 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: 1,328
    01-02-2012, 02:04 AM Go to last post
  24. 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: 2,488
    01-02-2012, 12:26 PM Go to last post
  25. 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: 4,757
    01-02-2012, 01:30 PM Go to last post
  26. 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: 2,895
    01-02-2012, 10:45 PM Go to last post
  27. 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: 1,723
    01-03-2012, 03:58 PM Go to last post
  28. 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: 2,599
    01-03-2012, 05:50 PM Go to last post
  29. 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: 1,557
    01-05-2012, 11:37 PM Go to last post
  30. 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: 2,716
    01-08-2012, 02:44 PM Go to last post
  31. 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: 2,117
    01-09-2012, 12:07 AM Go to last post
  32. (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: 3,147
    01-09-2012, 02:44 AM Go to last post
  33. 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: 1,035
    01-10-2012, 06:06 AM Go to last post
  34. [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: 2,093
    01-10-2012, 12:27 PM Go to last post
  35. 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: 7,988
    01-11-2012, 01:43 AM Go to last post
  36. 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: 3,168
    01-11-2012, 02:27 PM Go to last post
  37. 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: 2,546
    01-11-2012, 03:05 PM Go to last post
  38. 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: 4,087
    01-11-2012, 03:56 PM Go to last post
  39. 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: 3,609
    01-11-2012, 09:13 PM Go to last post
  40. 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: 4,458
    01-12-2012, 08:05 PM Go to last post
  41. 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: 1,470
    01-13-2012, 03:21 AM Go to last post
  42. 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: 2,298
    01-13-2012, 08:05 AM Go to last post
  43. 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: 1,664
    01-15-2012, 05:02 AM Go to last post
  44. 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: 3,277
    01-15-2012, 07:05 AM Go to last post
  45. 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: 1,271
    01-15-2012, 10:35 PM Go to last post
  46. 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: 8,152
    01-16-2012, 10:10 AM Go to last post
  47. 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: 3,271
    01-16-2012, 07:36 PM Go to last post
  48. 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: 1,627
    01-16-2012, 09:29 PM Go to last post
  49. 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: 2,302
    01-17-2012, 07:24 AM Go to last post
  50. 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: 2,442
    01-17-2012, 04:01 PM Go to last post
  51. 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: 9,460
    01-18-2012, 12:05 PM Go to last post
  52. 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: 4,061
    01-18-2012, 11:01 PM Go to last post
  53. 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: 4,002
    01-18-2012, 11:26 PM Go to last post
  54. 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: 2,749
    01-19-2012, 12:29 AM Go to last post
  55. 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: 2,352
    01-19-2012, 04:15 AM Go to last post
  56. 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: 3,283
    01-19-2012, 10:06 AM Go to last post
  57. 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: 13,669
    01-19-2012, 10:44 AM Go to last post
  58. 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: 1,724
    01-19-2012, 12:57 PM Go to last post
  59. 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: 8,095
    01-20-2012, 07:59 AM Go to last post
  60. 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: 6,195
    01-20-2012, 12:56 PM Go to last post

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