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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 3,386
    01-27-2012, 01:54 PM Go to last post
  2. Multiple regression problem S Shape Residuals

    Hello: I have posted this question before but wanted to give a more thorough explanation of my problem so as to hopefully garner some assistance. I...

    Started by need‎, 01-26-2012 09:37 AM
    • Replies: 11
    • Views: 4,585
    01-26-2012, 10:16 PM Go to last post
  3. Interpretation of high R2 with curvature in residuals and significant lack of fit

    Hello: I have a multiple regression model that shows 91% R^2 but has an s-shaped residuals plot and a significant lack of fit test. I am trying to...

    Started by need‎, 01-25-2012 04:30 PM
    • Replies: 2
    • Views: 3,212
    01-26-2012, 08:27 PM Go to last post
  4. Plotting Interaction between Two Nominal and One Quantitative IVs

    Hi all, I am curious about plotting regression interactions. The detail of my design is as follows: Independent variables: A (nominal, 2 levels:...

    Started by nathan3073‎, 01-26-2012 06:23 PM
    • Replies: 0
    • Views: 1,905
    01-26-2012, 06:23 PM Go to last post
  5. Reason for Higher Correlation weight Being Non-Significant

    Hi everyone, I ran a multilevel model using proc mixed. I obtained the following results. I ran a single regression using two scales as...

    Started by njacobson88‎, 01-26-2012 03:24 PM
    • Replies: 0
    • Views: 962
    01-26-2012, 03:24 PM Go to last post
  6. Exclamation Multi linear regression

    Hello everyone, I am new here (and to stats in general). Anyway I am working on a project where I want to predict the value of an outcome and I...

    Started by JohnLock‎, 01-23-2012 07:24 AM
    multi linear regression
    • Replies: 7
    • Views: 2,917
    01-26-2012, 12:57 PM Go to last post
  7. 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 05:37 AM
    • Replies: 1
    • Views: 5,301
    01-25-2012, 04:49 PM Go to last post
  8. 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: 34,716
    01-25-2012, 03:52 PM Go to last post
  9. 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: 5,502
    01-25-2012, 02:57 PM Go to last post
  10. 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: 2,061
    01-25-2012, 12:54 PM Go to last post
  11. 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: 3,096
    01-25-2012, 11:29 AM Go to last post
  12. 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: 4,028
    01-23-2012, 02:31 PM Go to last post
  13. 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: 13,375
    01-23-2012, 12:16 PM Go to last post
  14. 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: 3,483
    01-23-2012, 05:01 AM Go to last post
  15. 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: 7,009
    01-22-2012, 09:54 AM Go to last post
  16. 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: 9,833
    01-20-2012, 01:01 PM Go to last post
  17. 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: 6,150
    01-20-2012, 12:56 PM Go to last post
  18. 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: 8,029
    01-20-2012, 07:59 AM Go to last post
  19. 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: 1,709
    01-19-2012, 12:57 PM Go to last post
  20. 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: 13,580
    01-19-2012, 10:44 AM Go to last post
  21. 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: 3,262
    01-19-2012, 10:06 AM Go to last post
  22. 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: 2,330
    01-19-2012, 04:15 AM Go to last post
  23. 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: 2,724
    01-19-2012, 12:29 AM Go to last post
  24. 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: 3,970
    01-18-2012, 11:26 PM Go to last post
  25. 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: 4,015
    01-18-2012, 11:01 PM Go to last post
  26. 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: 9,396
    01-18-2012, 12:05 PM Go to last post
  27. 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: 2,410
    01-17-2012, 04:01 PM Go to last post
  28. 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: 2,284
    01-17-2012, 07:24 AM Go to last post
  29. 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: 1,608
    01-16-2012, 09:29 PM Go to last post
  30. 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: 3,229
    01-16-2012, 07:36 PM Go to last post
  31. 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: 8,075
    01-16-2012, 10:10 AM Go to last post
  32. 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: 1,253
    01-15-2012, 10:35 PM Go to last post
  33. 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: 3,239
    01-15-2012, 07:05 AM Go to last post
  34. 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: 1,643
    01-15-2012, 05:02 AM Go to last post
  35. 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: 2,283
    01-13-2012, 08:05 AM Go to last post
  36. 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: 1,466
    01-13-2012, 03:21 AM Go to last post
  37. 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: 4,445
    01-12-2012, 08:05 PM Go to last post
  38. 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: 3,574
    01-11-2012, 09:13 PM Go to last post
  39. 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: 4,036
    01-11-2012, 03:56 PM Go to last post
  40. 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: 2,513
    01-11-2012, 03:05 PM Go to last post
  41. 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: 3,141
    01-11-2012, 02:27 PM Go to last post
  42. 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: 7,913
    01-11-2012, 01:43 AM Go to last post
  43. [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: 2,073
    01-10-2012, 12:27 PM Go to last post
  44. 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: 1,026
    01-10-2012, 06:06 AM Go to last post
  45. (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: 3,115
    01-09-2012, 02:44 AM Go to last post
  46. 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: 2,095
    01-09-2012, 12:07 AM Go to last post
  47. 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: 2,702
    01-08-2012, 02:44 PM Go to last post
  48. 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: 1,546
    01-05-2012, 11:37 PM Go to last post
  49. 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: 2,573
    01-03-2012, 05:50 PM Go to last post
  50. 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: 1,714
    01-03-2012, 03:58 PM Go to last post
  51. 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: 2,882
    01-02-2012, 10:45 PM Go to last post
  52. 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: 4,738
    01-02-2012, 01:30 PM Go to last post
  53. 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: 2,465
    01-02-2012, 12:26 PM Go to last post
  54. 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: 1,317
    01-02-2012, 02:04 AM Go to last post
  55. 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: 3,729
    12-31-2011, 12:03 PM Go to last post
  56. 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: 1,834
    12-30-2011, 04:44 PM Go to last post
  57. 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: 15,121
    12-30-2011, 01:11 PM Go to last post
  58. 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: 4,213
    12-27-2011, 01:15 AM Go to last post
  59. 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: 1,565
    12-26-2011, 06:25 PM Go to last post
  60. 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: 13,583
    12-25-2011, 02:33 PM Go to last post

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