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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. 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: 1,293
    01-13-2012, 08:05 AM Go to last post
  2. 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: 793
    01-13-2012, 03:21 AM Go to last post
  3. 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: 3,277
    01-12-2012, 08:05 PM Go to last post
  4. 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: 2,214
    01-11-2012, 09:13 PM Go to last post
  5. 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: 2,127
    01-11-2012, 03:56 PM Go to last post
  6. 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: 872
    01-11-2012, 03:05 PM Go to last post
  7. 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: 2,169
    01-11-2012, 02:27 PM Go to last post
  8. 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: 4,443
    01-11-2012, 01:43 AM Go to last post
  9. [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: 951
    01-10-2012, 12:27 PM Go to last post
  10. 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: 607
    01-10-2012, 06:06 AM Go to last post
  11. (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: 1,628
    01-09-2012, 02:44 AM Go to last post
  12. 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: 778
    01-09-2012, 12:07 AM Go to last post
  13. 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: 1,424
    01-08-2012, 02:44 PM Go to last post
  14. 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: 695
    01-05-2012, 11:37 PM Go to last post
  15. 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: 1,356
    01-03-2012, 05:50 PM Go to last post
  16. 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: 989
    01-03-2012, 03:58 PM Go to last post
  17. 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: 1,674
    01-02-2012, 10:45 PM Go to last post
  18. 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: 2,535
    01-02-2012, 01:30 PM Go to last post
  19. 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: 760
    01-02-2012, 12:26 PM Go to last post
  20. 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: 560
    01-02-2012, 02:04 AM Go to last post
  21. 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: 2,457
    12-31-2011, 12:03 PM Go to last post
  22. 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: 709
    12-30-2011, 04:44 PM Go to last post
  23. 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: 10,334
    12-30-2011, 01:11 PM Go to last post
  24. 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: 2,266
    12-27-2011, 01:15 AM Go to last post
  25. 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: 787
    12-26-2011, 06:25 PM Go to last post
  26. 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: 10,377
    12-25-2011, 02:33 PM Go to last post
  27. 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: 1,870
    12-24-2011, 01:23 PM Go to last post
  28. 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: 1,217
    12-24-2011, 12:16 AM Go to last post
  29. Logit coefficients interpretation...

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

    Started by jesse2‎, 12-21-2011 11:49 PM
    • Replies: 2
    • Views: 4,251
    12-22-2011, 05:37 AM Go to last post
  30. 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: 1,697
    12-21-2011, 11:06 AM Go to last post
  31. 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: 2,966
    12-21-2011, 09:38 AM Go to last post
  32. 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: 13,728
    12-21-2011, 04:00 AM Go to last post
  33. 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: 2,005
    12-20-2011, 05:18 PM Go to last post
  34. 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: 736
    12-19-2011, 02:46 PM Go to last post
  35. 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: 6,570
    12-18-2011, 11:09 PM Go to last post
  36. 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: 828
    12-18-2011, 04:39 PM Go to last post
  37. 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: 827
    12-17-2011, 08:43 AM Go to last post
  38. (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: 1,127
    12-15-2011, 02:25 PM Go to last post
  39. 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: 8,293
    12-15-2011, 08:22 AM Go to last post
  40. 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: 13,859
    12-14-2011, 02:36 PM Go to last post
  41. 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: 1,120
    12-14-2011, 08:42 AM Go to last post
  42. 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: 1,413
    12-13-2011, 10:12 AM Go to last post
  43. Help-The F or chi2 model statistic has been reported as missing

    Hello All, I use Robust regression for event study- cross sectional. I have 25 industries dummies (0,1) in my regression and always "Adj...

    Started by Stata_user‎, 12-13-2011 08:30 AM
    • Replies: 0
    • Views: 2,333
    12-13-2011, 08:30 AM Go to last post
  44. Assumptions of Quantile Regression

    Is equal variance an assumption of quantile regression? Does quantile or median regression have any assumptions? Thanks.

    Started by zeloc‎, 12-11-2011 02:23 PM
    • Replies: 1
    • Views: 1,921
    12-12-2011, 02:07 AM Go to last post
  45. partial r2 vs partial correlation vs stnd coefficients

    Hi all, I have run a few linear regression models predicting water quality for watersheds using explanatory variables such as mean impervious...

    Started by seth‎, 02-11-2011 01:30 AM
    • Replies: 9
    • Views: 12,766
    12-11-2011, 09:02 PM Go to last post
  46. 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: 5,368
    12-11-2011, 05:12 PM Go to last post
  47. Linear Regression: Mean square error (MSE) ?

    Simple linear regression model: Y_i = β0 + β1*X_i + ε_i , i=1,...,n where n is the number of data points, ε_i is random error Let σ^2 = V(ε_i)...

    Started by kingwinner‎, 05-21-2009 08:46 PM
    • Replies: 11
    • Views: 46,334
    12-11-2011, 12:32 PM Go to last post
  48. Can RSS be decreased to 0 when dimension increases?

    Let's consider a simple example: I have two attributes X1 and X2, each has n values; response variable is Y. Using the two attributes together to...

    Started by ColdKing‎, 12-10-2011 12:59 PM
    dimension, regression, rss
    • Replies: 7
    • Views: 1,739
    12-11-2011, 01:07 AM Go to last post
  49. Multiple regression - text dropped an independent variable without explanation

    Hi, My text provided many independent variables including 4 departments. But in the actual regression, they excluded one department without...

    Started by pcampin‎, 12-10-2011 11:34 AM
    • Replies: 2
    • Views: 873
    12-10-2011, 05:14 PM Go to last post
  50. 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: 1,120
    12-10-2011, 03:07 PM Go to last post
  51. Endogenous variable

    Hi, I am implementing a two-stage OLS regression to account for the endogeneity of a variable. My instruments are time invariant. However, the...

    Started by tiab2005‎, 12-07-2011 05:40 PM
    endogeneity, instrumental variables, two-stage ols
    • Replies: 1
    • Views: 704
    12-10-2011, 12:30 PM Go to last post
  52. Testing a predictive algorithm

    I have an algorithm that takes text data and predicts polarity of the data between -1 and 1. I want to test this algorithm for it's ability to...

    Started by trinker‎, 12-07-2011 09:26 PM
    • Replies: 7
    • Views: 1,155
    12-08-2011, 07:38 PM Go to last post
  53. question about Logistic regression

    Hi, I've wondered about logistic analysis. In glm(generalized linear model), link function value of mean = linear predictot. So, classical model's...

    Started by subspaces‎, 12-08-2011 02:26 AM
    • Replies: 2
    • Views: 1,099
    12-08-2011, 07:50 AM Go to last post
  54. Pearson's correlation coefficient (Excel help)

    Hello, new user here :) I have created distance matrices for two data sets (a ligand and it's receptor) and I now must compute the linear...

    Started by Ashmore‎, 12-03-2011 07:28 AM
    • Replies: 1
    • Views: 1,074
    12-07-2011, 08:10 PM Go to last post
  55. Ordinal Logistic vs. Multinomial Regression and program

    I am trying to conceptually understand when I would use ordinal logistic vs. multinomial. It seems to me that if there is an order to the categories...

    Started by zeloc‎, 12-07-2011 01:56 PM
    • Replies: 2
    • Views: 1,766
    12-07-2011, 08:04 PM Go to last post
  56. GEE and sample size

    Hello, I'd like to know how to correct for small sample size in GEE.

    Started by Itddoo‎, 12-07-2011 02:48 PM
    • Replies: 1
    • Views: 1,558
    12-07-2011, 03:44 PM Go to last post
  57. negative binomial regression

    hello all, i'm looking for some articles regarding negative binomial regression. i don't know much about general linear models or logistic...

    Started by RefUser‎, 12-06-2011 01:17 PM
    • Replies: 2
    • Views: 1,189
    12-06-2011, 02:03 PM Go to last post
  58. 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: 1,285
    12-06-2011, 11:49 AM Go to last post
  59. compare Spearman's correlations

    Dear all, I performed several Spearman's correlation tests between the same independent variable and different dependent ones. All the...

    Started by marco77‎, 12-05-2011 10:29 AM
    • Replies: 2
    • Views: 1,979
    12-06-2011, 05:07 AM Go to last post
  60. Advice for random effects with interaction term?

    I have a continuous dependent variable A and a continuous independent variable B. I measured these variables in 12 locations that can be separated...

    Started by sovay‎, 12-05-2011 12:26 AM
    • Replies: 1
    • Views: 2,137
    12-05-2011, 03:26 PM Go to last post

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