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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Now sure what to do now (4 variables, no interaction, significant correlated)

    Hello everybody - I am in need of some statistical help as I'm a bit confused as to what to do next. I'll give you a rundown of my situation: I've...

    Started by CedricFP‎, 04-09-2010 06:56 AM
    • Replies: 7
    • Views: 5,417
    04-22-2010, 11:26 AM Go to last post
  2. linear regression short easy question

    Hi there, I have the response Y and some covariates. I want to do linear regression. Among the covariates there is the covariate sex (1: male,...

    Started by leo nidas‎, 06-21-2010 06:32 PM
    • Replies: 7
    • Views: 3,978
    06-22-2010, 10:46 AM Go to last post
  3. Simple logistic regresssion question

    I am currently doing a project that requires some simple logistic regression analysis in SAS(version 9.1). For some reason my results seem to be the...

    Started by nwigg‎, 07-09-2010 09:47 PM
    • Replies: 7
    • Views: 3,030
    07-09-2010, 11:12 PM Go to last post
  4. 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: 27,992
    10-07-2010, 03:37 PM Go to last post
  5. P value results

    Dear Colleagues I did a bivariate regression using 10 independent variables on each dependent variable. all the results are significant at 95%...

    Started by momo‎, 11-11-2010 03:51 PM
    • Replies: 7
    • Views: 5,044
    01-06-2011, 07:08 PM Go to last post
  6. Regression using gram-schmidt orthogonalization

    Hello dear members, Hoping again to solicit some help from the knowledgeable members here, I thought I'd come to you with this question. I'm...

    Started by Link‎, 12-05-2010 12:33 PM
    • Replies: 7
    • Views: 5,932
    12-07-2010, 11:31 PM Go to last post
  7. Nonlinear regression using the Gauss-Newton algorithm in C

    Hey guys, I'm being asked to program this up in C. If any of you know of any good references for the Gauss-Newton algorithm, please post them for...

    Started by Link‎, 12-16-2010 04:59 PM
    • Replies: 7
    • Views: 10,897
    12-17-2010, 10:56 AM Go to last post
  8. Hosmer-Lemeshow

    Hi! How do you discussion the vaule for the Hosmer-Lemeshow goodness of fitt in a logistic regression? I tha value 0,290 bad? Regards!

    Started by igolonte‎, 03-30-2011 07:25 AM
    • Replies: 7
    • Views: 9,339
    04-04-2011, 07:24 AM Go to last post
  9. Thumbs up Dealing with missing data?!

    Hi guys, I was wondering if anyone can help me figure out what to do, I am pretty bad at statistics but needs must and all that! :p Basically...

    Started by Royalty‎, 04-23-2011 11:03 AM
    • Replies: 7
    • Views: 6,600
    04-24-2011, 12:51 PM Go to last post
  10. Did I just fudge this categorical data transformation too much?

    I have a public data set gathered from 336 hospitals, with about 28,000 rows. I want to see if there is relationship between a particular input...

    Started by greg.neyman‎, 05-02-2011 04:33 PM
    categorical data analysis, dummy variables
    • Replies: 7
    • Views: 3,753
    05-05-2011, 05:05 PM Go to last post
  11. Question Straightforward question about how to select Generalized Linear Model

    Hi! I have what I think is quite a straightforward problem for those in the know. I have a dependent variable measured in different subjects....

    Started by amorphia78‎, 05-18-2011 03:12 PM
    • Replies: 7
    • Views: 3,060
    05-19-2011, 02:54 PM Go to last post
  12. In stepwise regression, can the number of predictors be >n?

    Hi, I'm getting an error when I try to run a stepwise regression with backward elimination - it says there is not enough data in the columns. I...

    Started by l3a9k‎, 06-09-2011 08:35 AM
    • Replies: 7
    • Views: 3,519
    06-14-2011, 07:54 AM Go to last post
  13. Multiple regression with non-normal distribution?

    I have some data that I would like to analyse by using multiple regression, as I am interested in the predictive ability of a model (variables...

    Started by judith_sw‎, 06-18-2011 04:58 PM
    • Replies: 7
    • Views: 25,246
    06-19-2011, 04:00 AM Go to last post
  14. standardised coefficients

    Hi there, I have a basic question - SPSS output gives me unstandardized coefficients and standardized coefficient (the latter looking much nicer -...

    Started by Sylviastat‎, 07-23-2011 03:44 PM
    • Replies: 7
    • Views: 3,762
    07-23-2011, 04:51 PM Go to last post
  15. Lmer Output/: variable re-levelling

    Morning/Evening all I'm having a bit of a time getting the LME4 package to list ALL of my IVs, rather than all-1. By way of example, here is my...

    Started by drewmac‎, 09-04-2011 04:18 PM
    binomial, lmer, logistic regression, r package
    • Replies: 7
    • Views: 6,175
    09-06-2011, 06:56 AM Go to last post
  16. Model building question-Is the researcher right?

    I'm thinking about a researcher who made the following statement about a model(upon criticism of his interpretation of the data). "There is a...

    Started by leavesof3‎, 11-09-2011 06:30 PM
    baseball, regression, research
    • Replies: 7
    • Views: 2,712
    11-13-2011, 05:22 PM Go to last post
  17. Basic multiple regression question

    Sorry, should've probably specified linear regression. I was given a data and ran a proc corr on it in sas. As you can see, x1 through x5...

    Started by downthesun01‎, 11-16-2011 01:00 AM
    • Replies: 7
    • Views: 2,307
    11-25-2011, 05:22 AM Go to last post
  18. 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: 2,913
    12-08-2011, 07:38 PM Go to last post
  19. 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: 3,349
    12-11-2011, 01:07 AM Go to last post
  20. 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: 22,185
    12-21-2011, 04:00 AM Go to last post
  21. 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: 15,239
    12-30-2011, 01:11 PM Go to last post
  22. 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: 2,933
    01-26-2012, 12:57 PM Go to last post
  23. Smile testing whether the role of a predictor differs between two dependent variables

    I have some questions about an analysis I am running. Sorry if they are very basic questions or completely off-course, but some help would be greatly...

    Started by Lara333‎, 02-01-2012 10:08 AM
    comparing coefficients, regression analysis
    • Replies: 7
    • Views: 2,159
    02-03-2012, 10:23 AM Go to last post
  24. Regression on Counts

    Hi, I have data on number of laps mice have run over several days after an injection (simulate injury) and receiving one of two treatments...

    Started by ted‎, 02-14-2012 01:29 PM
    • Replies: 7
    • Views: 2,583
    02-20-2012, 04:09 PM Go to last post
  25. Possible to analyze cross lag panel data with regression alone (no SEM)?

    I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 14,039
    03-14-2012, 10:57 AM Go to last post
  26. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 24,637
    03-06-2012, 11:39 AM Go to last post
  27. The standardized and non standardized coefficients gives diff results

    Hi. Some coworkers ran a regression and used first the beta to analyze the strength of the independent variables in a regression. However all the...

    Started by Kframnes‎, 03-09-2012 04:28 PM
    • Replies: 7
    • Views: 6,099
    03-09-2012, 05:21 PM Go to last post
  28. Imputation Missing Value with Regression

    Hai, i'm new in here. I'm doing my final project now. Actually i'm not in statistics department or something about statistics. I'm in informatics...

    Started by istia‎, 04-24-2012 07:14 AM
    • Replies: 7
    • Views: 1,998
    04-26-2012, 01:35 AM Go to last post
  29. Calculating Cook's Critical Value

    Hey can someone show me how to get F (4,15) (0.5) = 0.8783.

    Started by saternal‎, 05-12-2012 12:43 AM
    • Replies: 7
    • Views: 5,254
    05-12-2012, 01:37 PM Go to last post
  30. natural log of DV [or not?] in OLS regression? and collinearity questions for IVs

    First I want to thank anyone who responds in advance. I'm grateful for any teaching I can get. Secondly, I'm math challenged. And my stats...

    Started by xpropatroller‎, 06-28-2012 09:06 PM
    • Replies: 7
    • Views: 4,648
    07-05-2012, 10:26 PM Go to last post
  31. Interpreting results: repeated measures logistic regression

    I am into some new territory with repeated measures logistic regression. The hypothesis for this study is that treatment will make more less...

    Started by trinker‎, 05-31-2012 10:19 PM
    • Replies: 7
    • Views: 3,181
    06-02-2012, 09:24 PM Go to last post
  32. Using OLS vs Probit/Logit to estimate a threshold

    Suppose you're a meteorologist and want to predict whether tomorrow the temperature will exceed 20 degrees. Your boss gives you data where t is...

    Started by aboluk‎, 07-03-2012 06:57 PM
    • Replies: 7
    • Views: 4,285
    07-04-2012, 04:21 PM Go to last post
  33. Getting F statistic from multiple t-statistics?

    If I have Y = a + b1*X1 + b2*X2 + b3*X3 + error, and I have calculated sample t-statistics for b1 and b2, from this information (along with...

    Started by derksheng‎, 07-23-2012 12:23 PM
    • Replies: 7
    • Views: 2,828
    07-24-2012, 03:24 AM Go to last post
  34. Best regression for linear data with nonlinear data in the top quartile?

    I am looking at the relationship between percentile ranking of asset management product performance and subsequent fund inflows/outflows (from...

    Started by gopherone‎, 08-01-2012 01:20 PM
    • Replies: 7
    • Views: 2,862
    08-03-2012, 09:17 AM Go to last post
  35. Multiple regression, why use categories

    Hello, I have a question regarding multiple regression. I am reading a paper in which the author performed a multiple regression to predict...

    Started by bradyj2‎, 09-06-2012 06:27 AM
    • Replies: 7
    • Views: 2,363
    09-08-2012, 05:47 AM Go to last post
  36. Constant of 1: Why?

    I know that in regression (well any linear model I would assume; correct this if I'm wrong) models there's a constant of 1 added to the model. I've...

    Started by trinker‎, 09-19-2012 08:26 AM
    constant, regression
    • Replies: 7
    • Views: 3,045
    09-19-2012, 12:19 PM Go to last post
  37. Interpreting a variable

    I have a project where I am supposed to interpret a number of variables. In the regression the variables are: The variable I am supposed to...

    Started by Limen‎, 04-14-2013 04:52 PM
    • Replies: 7
    • Views: 1,946
    04-15-2013, 10:08 AM Go to last post
  38. Multiple regression

    I have two predictors in my model. One is nominal and dichotomous (Male or Female), and is producing a negative β. The other predictor is ordinal and...

    Started by Boon‎, 01-08-2013 11:14 AM
    • Replies: 7
    • Views: 1,423
    01-09-2013, 12:52 PM Go to last post
  39. Baseball stat fans?

    I play on online Baseball simulator that uses numerous ratings and processes them through an engine which spits out a box score and results. I...

    Started by cledussnow‎, 01-14-2013 01:41 PM
    • Replies: 7
    • Views: 1,203
    01-15-2013, 04:46 PM Go to last post
  40. How to evaluate model fit of parametric survival analyses?

    Hello everyone, I'm using Stata to generate parametric survival analyses and I'm looking for methods to evaluate the model fit. As far as I know...

    Started by Olaf‎, 01-18-2013 05:58 PM
    • Replies: 7
    • Views: 2,053
    01-24-2013, 07:09 PM Go to last post
  41. Help with understanding logit coefficient

    Hi everyone, I'm very new to statistics and I would very much appreciate any help you can give me in understanding the coefficients in a logit model....

    Started by EmmaWalfer‎, 03-23-2013 04:10 PM
    • Replies: 7
    • Views: 1,976
    03-28-2013, 10:19 AM Go to last post
  42. Relative regression analysis?

    Hi, I am a new member of this thread. I need help with my hypothesis testing. Simply put, my hypothesis is " As A goes up, B and C go up but B...

    Started by rmittal‎, 05-03-2013 04:35 PM
    • Replies: 7
    • Views: 3,389
    05-06-2013, 01:29 PM Go to last post
  43. Which model?

    Hi, I'm writing my master thesis and I don't really know which model to use. The response variable is a countvariable: the number of broilers...

    Started by LukasVO‎, 05-06-2013 03:54 AM
    • Replies: 7
    • Views: 1,526
    05-06-2013, 05:51 PM Go to last post
  44. Nagelkerke and overall hit ratio won't improve in my logistic regression model!

    Hi! I have a problem doing my course assignment(with SPSS): I can't find a way to improve the overall hit ratio and Nagelkerke levels even...

    Started by Ivar‎, 06-13-2013 01:59 PM
    • Replies: 7
    • Views: 4,141
    06-14-2013, 03:31 PM Go to last post
  45. Likert Scale Regression Analysis

    I want to perform a regression on some likert scale data. Basically its a scale which measures propensity for participative management. The rationale...

    Started by andrewol‎, 08-12-2013 03:01 PM
    • Replies: 7
    • Views: 14,338
    08-13-2013, 04:09 PM Go to last post
  46. Regression Discontinuity

    Hi... I'm trying to define a model for estimating the impact of a political program (increase in user fees). I thought about using the RD since...

    Started by PedroR‎, 07-29-2013 03:53 PM
    • Replies: 7
    • Views: 2,317
    07-30-2013, 11:20 AM Go to last post
  47. One population, two sampling methods, how many logistic regression models?

    I have 400 randomly selected urban households. I have 400 rural households selected from 15 villages census style. Food insecurity (dichotomous) is...

    Started by sophiabf‎, 08-19-2013 06:15 PM
    explanatory variables, logistic regression, sample design
    • Replies: 7
    • Views: 1,585
    08-20-2013, 01:14 PM Go to last post
  48. hierarchical regression with different DV for each block?

    Greetings. I'm trying to figure out how to do a hierarchical regression whereby the DV regressed on block 1 becomes the IV in block 2, which then...

    Started by vtmft‎, 09-02-2013 03:45 PM
    • Replies: 7
    • Views: 2,631
    09-05-2013, 12:43 AM Go to last post
  49. Logistic Regression with unequal proportions

    Hello With the help of this forum I'm getting my head around logistic regression. My data contains a survived/died response and within the...

    Started by scotchpie‎, 10-08-2013 02:30 AM
    • Replies: 7
    • Views: 2,351
    10-09-2013, 03:06 PM Go to last post
  50. 4PL Non-Linear Regression, Transforming observed y values

    Good Afternoon, I'm currently teaching my self how to fit response curves, and have run into some trouble. I currently need assistance on...

    Started by BrainExploding‎, 10-21-2013 03:34 PM
    4pl, curve fitting, log transformation, non-linear regression, response curve
    • Replies: 7
    • Views: 5,016
    10-22-2013, 12:33 PM Go to last post
  51. Interaction Terms: Logistic Regression

    Dear forum, trying again... I would really like some advice on the proper construction and interpretation of a small experiment and analysis...

    Started by rclukey‎, 10-23-2013 12:02 PM
    interaction terms, logistic, regression
    • Replies: 7
    • Views: 3,118
    10-23-2013, 05:33 PM Go to last post
  52. Do my data meet the assumptions for multiple linear regression?

    ~ There are no outliers in the standard residuals ~ Multicollinearity is not a concern ~ Independent errors are met (Durbin-Watson = 1.95) ~...

    Started by memomemootoo‎, 01-21-2014 02:09 PM
    • Replies: 7
    • Views: 3,350
    01-23-2014, 08:12 AM Go to last post
  53. What are the implications if variance changes with x

    I am told that Var(U_i |X) =(sigma)^2(x_i)^2 and that the covariance between all the unobservables is equal to sigma squared If I'm looking...

    Started by kingsolomonsgrave‎, 10-02-2013 05:09 PM
    • Replies: 7
    • Views: 1,763
    10-03-2013, 08:05 PM Go to last post
  54. Please help

    Hi everyone I am wondering if you can help me out. I am completing my PhD and have run into some problems interpreting some of the stats. I have...

    Started by Zen‎, 02-25-2014 03:28 PM
    • Replies: 7
    • Views: 1,604
    03-04-2014, 01:50 PM Go to last post
  55. Question Linear Regression:Controlling for categorical independent variables, WITHOUT dummies?

    Short version: Does including a categorical nominal-level independent variable WITHOUT dummies still work as a simple control for other independent...

    Started by khaidoba‎, 03-24-2014 12:45 PM
    categorical variable, dummy coding, linear regression, nominal variable
    • Replies: 7
    • Views: 2,560
    03-30-2014, 01:24 PM Go to last post
  56. Clustered Robust SEs or Multilevel Modeling approach? HELP NEEDED :-)

    Hello everyone, I would love to hear your quick reaction to a particular data structure my colleagues and I are working with because we keep...

    Started by ema2146‎, 03-31-2014 09:45 AM
    • Replies: 7
    • Views: 1,808
    04-01-2014, 10:13 AM Go to last post
  57. Dispersion parameter

    I have the understanding that the dispersion parameter, \phi, in generalised linear models needs to be known for deviance to meaningful or otherwise...

    Started by Prometheus‎, 04-07-2014 03:13 PM
    dispersion parameter, glm
    • Replies: 7
    • Views: 1,797
    04-14-2014, 07:11 AM Go to last post
  58. Can I compare regression models with same # predictors and same sample?

    Hi there, As a part of my dissertation I want to compare a focal, new, variable against other well-known predictors of my outcome, so I plan to...

    Started by CWRUgradstudent‎, 04-27-2014 11:32 PM
    model comparison, multicollinearity, regression, steiger's z
    • Replies: 7
    • Views: 1,789
    04-28-2014, 11:49 AM Go to last post
  59. Continuous by contiuous interaction and non-linearity in OLS

    To whom it may concern: I am conducting an OLS for a class assignment and have an interaction between ADHD and non-delinquent peers. I have...

    Started by steph88‎, 05-02-2014 12:56 PM
    continuous variable, interaction, non-linearity, ols
    • Replies: 7
    • Views: 1,755
    05-02-2014, 01:44 PM Go to last post
  60. R squared and Standard Error

    Hi, Can standard error be 94.10 when R squared is 0.67 in a linear model? Thanks.

    Started by john_f‎, 07-17-2014 05:29 AM
    r squared, standard error
    • Replies: 7
    • Views: 1,728
    07-22-2014, 02:31 PM Go to last post

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