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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Reporting results of non-linear regression with centered variables

    Hi I have a regression y = a + b1(x) + b2(x^2) + ...bn + e when i run the regression b1 and b2 are significant (and of opposite sign) but...

    Started by steve1‎, 11-04-2014 11:55 AM
    • Replies: 3
    • Views: 2,059
    11-14-2014, 11:12 AM Go to last post
  2. Rank-ordered Logistic Regression - assumptions?

    Hello dear forum members, The DV in the recently undertaken study is Rank (1-899). I believe, rank-ordered logistic regression is the proper type...

    Started by kiton‎, 11-14-2014 11:08 AM
    • Replies: 0
    • Views: 670
    11-14-2014, 11:08 AM Go to last post
  3. how to find interaction terms in regression modeling

    Given a set of predictor variables, are there any ways to test interaction terms? If I test one by one, it will be impossible to do it?

    Started by winecoding‎, 11-13-2014 08:13 PM
    interaction, regression
    • Replies: 3
    • Views: 952
    11-14-2014, 10:58 AM Go to last post
  4. Hotelling's Trace v. Hotelling's T^2- Why make the move?

    Hello, I am writing a dissertation and my chair wants me to convert Hotelling's Trace (resulting from my MANOVA) into Hotelling's T^2. No problem...

    Started by te156311‎, 11-14-2014 07:17 AM
    anova, hotelling's, manova, regression, t-tests
    • Replies: 0
    • Views: 1,367
    11-14-2014, 07:17 AM Go to last post
  5. Avoiding spurious regression in meta-regression using stationary variables like GDP

    I have been reading everything I can get my hands on about spurious regression but can't seem to definitively find out what is best in regressing...

    Started by samuelle‎, 11-12-2014 11:10 AM
    gdp, meta-regression, spurious, stationary variables
    • Replies: 0
    • Views: 873
    11-12-2014, 11:10 AM Go to last post
  6. Instrumental Variable Regression

    Dear All I am writing my master thesis about countervailing power in the HIV medication drug market. For doing so I am conducting the regression:...

    Started by Nathalie_Frisch‎, 11-10-2014 10:41 AM
    • Replies: 1
    • Views: 958
    11-10-2014, 01:07 PM Go to last post
  7. Calculating AUC for just one binary variable legitimate?

    Dear members of talkstats, I am a junior Radiology resident in France and I have an urgent question about my study. I am checking the capability...

    Started by MeganFrance‎, 10-13-2014 03:19 PM
    • Replies: 4
    • Views: 1,034
    11-08-2014, 08:06 AM Go to last post
  8. help deciding on best fit regression model

    Hi I could do with some assistance for selecting a regression model for my data. The data is for a BSc science study and is analyising the...

    Started by rat101‎, 11-08-2014 04:56 AM
    • Replies: 0
    • Views: 699
    11-08-2014, 04:56 AM Go to last post
  9. Some Conceptual Questions About Quantile Regression

    Dear all, I have been teaching myself how to run quantile regression in R using the package called "quantreg." I was able to run these analyses...

    Started by myautumn28‎, 10-27-2014 10:10 PM
    • Replies: 1
    • Views: 1,015
    11-07-2014, 09:35 AM Go to last post
  10. Unhappy Logistic Regression on small sample size/case ratio - SPSS?

    Hi all - I have a small issue. I have a categorical dichotomous DV (0,1) with 4 IV's , two of which are categorical and dichotomous (0,1), and the...

    Started by ProXy124c41‎, 10-30-2014 12:08 PM
    • Replies: 2
    • Views: 6,577
    11-03-2014, 10:04 PM Go to last post
  11. Get correlation matrix of 3 variables from any combination of 3 simples/partials

    Here is the situation. I am writing a program that does Cool And Interesting Things starting with a correlation matrix among 3 variables: call...

    Started by Jake‎, 10-29-2014 05:44 PM
    • Replies: 0
    • Views: 941
    10-29-2014, 05:44 PM Go to last post
  12. Question Forecasting with fewer data points

    Hi, Can someone provide more insights on how we can achieve forecasting with fewer data points and come up with more accurate models. I have...

    Started by sihasan‎, 10-23-2014 07:53 AM
    • Replies: 4
    • Views: 1,086
    10-29-2014, 08:46 AM Go to last post
  13. Reporting variables into main equation after sqrt or log transformation

    Hi Everybody, If I am creating a multiple regression model such as Y = 3 + 1.5apple + 2melon and some of the indipendent variables underwent a...

    Started by F111‎, 10-23-2014 05:12 PM
    • Replies: 0
    • Views: 740
    10-23-2014, 05:12 PM Go to last post
  14. Analysis of a longitudinal study where interventions are received at different times

    I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

    Started by Blain Waan‎, 10-20-2014 02:08 PM
    longitudinal study, regression analysis, repeated measures
    • Replies: 2
    • Views: 801
    10-23-2014, 04:56 AM Go to last post
  15. Summarizing time series data

    Hello, Thank you very much for taking the time to read this! I have many (~70) time series showing the average body size (kg) for the ~50...

    Started by kmj‎, 10-20-2014 10:53 PM
    series, temporal, time, time series
    • Replies: 5
    • Views: 1,850
    10-21-2014, 04:18 PM Go to last post
  16. Inclusion of a control variable makes a predictor significant

    I'm running a logistic regression model. The outcome is political activism (1/0) and the significant predictors (dummy variables) are education,...

    Started by jjarg‎, 10-16-2014 03:23 PM
    logistic regression
    • Replies: 3
    • Views: 1,371
    10-18-2014, 05:41 AM Go to last post
  17. How can log link still allow negative predicted values?

    I have been attempting to get a meaningful outcome of my data for months, and could really do with some help where to go next. I am attempting to...

    Started by samuelle‎, 10-17-2014 10:50 AM
    glm regression, negative values, regression
    • Replies: 0
    • Views: 729
    10-17-2014, 10:50 AM Go to last post
  18. Multilevel: Include only two dummies of a 7-1 dummy set into random slope?

    I am calculating a two-level linear multilevel analysis. A look at the random intercept random slope model showed me a significant decrease in my...

    Started by David_D‎, 10-15-2014 11:44 AM
    • Replies: 5
    • Views: 1,486
    10-16-2014, 01:50 PM Go to last post
  19. regression models with mixed types of independent variables

    I am working on building a forecasting model, the independent variables are grouped into three types: some variables are continuous; some variables...

    Started by winecoding‎, 10-14-2014 10:24 PM
    forecasting, regression
    • Replies: 6
    • Views: 1,541
    10-15-2014, 12:45 PM Go to last post
  20. Hierarchical Regression Analyses - Testing for a Potential Power Issue

    Hi all, My sample consists of 236 participants and I am interesting in investigating the association of several factors with my outcome variable....

    Started by Junmato‎, 10-11-2014 11:10 AM
    • Replies: 1
    • Views: 877
    10-15-2014, 10:38 AM Go to last post
  21. Probing of interaction effect with MODPROB (Preacher & Hayes)

    Hello everyone, I have a result that I cannot quite understand. I have the following equition Y: Regret X: curiosity M: 2 conditions (0=...

    Started by Livdndri‎, 10-14-2014 08:36 AM
    • Replies: 1
    • Views: 944
    10-14-2014, 11:24 AM Go to last post
  22. positive loglikelihood?

    It seems to be no issue to have positive log likelihood in linear regression. How should I however interpret two positive LLs? In normal situation...

    Started by arkiaamu‎, 10-11-2014 07:45 AM
    • Replies: 1
    • Views: 1,561
    10-11-2014, 10:07 AM Go to last post
  23. Is poisson regression appropriate?

    This is more of a general stats question regarding the best procedure to answer my question of interest. I started to address it using poisson...

    Started by mrlang02‎, 10-10-2014 02:22 PM
    poisson regression
    • Replies: 0
    • Views: 946
    10-10-2014, 02:22 PM Go to last post
  24. Regression with cointegrated time series data

    Hello, I am studying a predator-prey relationships using field data collected biannually over 5 years. For example, here is some abundance data: ...

    Started by marshmugger‎, 10-04-2014 05:36 AM
    autocorrelation, time series regression
    • Replies: 3
    • Views: 1,978
    10-10-2014, 01:08 PM Go to last post
  25. Regression when IV are part of DV

    I have a DV that is made up of 7 IV. If you combine the IV you get the DV. I want to know the relative impact of each of the IV on the DV (relative...

    Started by noetsi‎, 10-09-2014 11:29 AM
    • Replies: 7
    • Views: 1,347
    10-10-2014, 01:02 PM Go to last post
  26. Appropriateness of semi-partial correlation squared when there are 10 predictors?

    Hi all, I'm conducting multiple regression with a regression model consisting of 10 predictors (4 of which are key study variables, the remainder...

    Started by thematfactor‎, 10-10-2014 12:39 AM
    • Replies: 0
    • Views: 735
    10-10-2014, 12:39 AM Go to last post
  27. Help interpret Odds Ratio for Age in logistic regression

    For the following results, am I correct in stating, for example, that men with children less than 16 years old are less likely to not complete...

    Started by jmhbot‎, 10-07-2014 11:21 AM
    • Replies: 9
    • Views: 1,651
    10-09-2014, 06:36 PM Go to last post
  28. Question about modeling public behavior

    I signed-up for this site hoping someone might be able to help me with a question I've been struggling with. I'm currently building a model that...

    Started by travisvox‎, 10-09-2014 01:36 PM
    • Replies: 3
    • Views: 986
    10-09-2014, 02:37 PM Go to last post
  29. Help, regression analysis for unbalanced data set

    Hi, guys, I need test whether a gene is differentially expressed between two groups, for example, In group 1, we have species A, species B,...

    Started by owomo‎, 10-08-2014 09:19 PM
    • Replies: 0
    • Views: 707
    10-08-2014, 09:19 PM Go to last post
  30. Feedback Questions (Robust)

    Dear all, Have recently had some high level feedback on a regression study. "How robust is your empirical results? I would like to see some...

    Started by richieboy‎, 10-05-2014 04:34 AM
    • Replies: 1
    • Views: 869
    10-05-2014, 05:31 AM Go to last post
  31. How to reduce variables in multiple linear regression when multicollinearity present?

    Good morning, afternoon, evening to everyone. First and foremost, this is my innaugural post so I hope I am following all of the recommended...

    Started by heyblinkin‎, 10-03-2014 03:40 PM
    • Replies: 6
    • Views: 1,563
    10-04-2014, 10:47 AM Go to last post
  32. Mixed models can variable be both fixed and random

    I am conducting an analysis over multiple subjects over several sessions with two types of controls. I want to conduct a mixed model analysis to...

    Started by Phdstudentz‎, 10-02-2014 12:42 PM
    fixed effect, longitudinal data, mixed effect models, random effect
    • Replies: 0
    • Views: 1,361
    10-02-2014, 12:42 PM Go to last post
  33. range of tuning parameters

    Hi All, I have just started my advanced statistics study. And here is one thing I have not been able to understand for long time -- how can we...

    Started by bettertony‎, 10-01-2014 02:40 PM
    cross validation, linear regression, regression, regularization, tuning, tuning parameter
    • Replies: 6
    • Views: 1,730
    10-01-2014, 07:09 PM Go to last post
  34. Probability of Predicted Values

    As I am still just learning regression and other advanced statistical analysis techniques, I have run into a question that I need help with. My Boss...

    Started by ccooper‎, 10-01-2014 07:51 AM
    gbm, prediction interval, prediction limits
    • Replies: 2
    • Views: 973
    10-01-2014, 02:08 PM Go to last post
  35. Understanding ordinal regression

    Hi! This is a really simple question, but one for which the answer continues to elude me! I understand that in a binary logit regression the...

    Started by Bfernandez‎, 10-01-2014 11:08 AM
    ordinal regression, regression analysis, regression coefficients
    • Replies: 0
    • Views: 1,131
    10-01-2014, 11:08 AM Go to last post
  36. Binary IV and ordinal DV, suggestions for a model?

    Hi guys! Just started at a new company having graduated this year, theyve got me analysing data and producing some key driver analytics. Thing is,...

    Started by Bfernandez‎, 09-19-2014 11:20 AM
    • Replies: 4
    • Views: 1,571
    10-01-2014, 03:57 AM Go to last post
  37. Time series forecasting

    Can any one explain how to forecast volatility in stock markets using auto-regressive models like TARCH, EGARCH etc.

    Started by timeseries‎, 09-30-2014 09:22 AM
    • Replies: 0
    • Views: 846
    09-30-2014, 09:22 AM Go to last post
  38. Interpreting transformations

    Say you transformed an X and Y in a regression model and you find that after the transformations X is signficant. Does this mean that the original X...

    Started by noetsi‎, 09-25-2014 11:07 AM
    • Replies: 2
    • Views: 939
    09-30-2014, 04:37 AM Go to last post
  39. whole data vs training/test data

    I have time series data of about 150 sample and 8 variables. It is used to generate a interaction network, whose exact structure is not known yet. ...

    Started by ice‎, 09-29-2014 02:41 PM
    non linear regression, validation
    • Replies: 1
    • Views: 888
    09-30-2014, 04:32 AM Go to last post
  40. Question Compute time to sell (with 50% probability) at Price P from linear regression

    I think this is a very basic question (from a total stat newbie). I'm trying to understand a problem I was given (I'm not a statistics student). It's...

    Started by mellema‎, 09-28-2014 11:30 PM
    linear regression, probability
    • Replies: 0
    • Views: 726
    09-28-2014, 11:30 PM Go to last post
  41. Small sample cross-sectional regression: different levels

    I have a small sample of about 50 firms, clustered in 20 countries. The main explanatory variables of interest are all firm-specific, as well as...

    Started by wilswine‎, 09-27-2014 09:43 AM
    cross sectional, ols regression
    • Replies: 0
    • Views: 984
    09-27-2014, 09:43 AM Go to last post
  42. Linear Regression

    Please see this link: http://www.statisticsforum.com/showthread.php?p=4240#post4240

    Started by DDD‎, 09-25-2014 01:56 PM
    • Replies: 4
    • Views: 1,386
    09-25-2014, 04:28 PM Go to last post
  43. Delogging variables

    Hey, I have run a multiple regression. DV is change in the log of assets Parameter Expected Sign Parameter (T stat) Chlnx ...

    Started by iloveireland‎, 09-25-2014 03:18 AM
    • Replies: 0
    • Views: 880
    09-25-2014, 03:18 AM Go to last post
  44. Scaling variables in regression

    If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both...

    Started by bcrider‎, 09-24-2014 12:32 AM
    categorical data, r program, regression analysis, scaling
    • Replies: 3
    • Views: 1,527
    09-24-2014, 03:30 PM Go to last post
  45. Multinomial Logistic Regression

    I have run a multinomial logistic regression looking to see if being a member of two different groups predicts group membership to 5 categories. I...

    Started by mlb‎, 09-24-2014 05:26 AM
    goodness of fit, logistic regression, regression
    • Replies: 0
    • Views: 740
    09-24-2014, 05:26 AM Go to last post
  46. Pairwise logistic regression - which trait is the dependent trait?

    Hi All, Could someone explain the reasoning behind choosing the dependent trait in pairwise logistic regression of two categorical traits. My...

    Started by lel7lel7‎, 09-22-2014 08:11 PM
    binary dependent variable, logistic regression
    • Replies: 0
    • Views: 1,056
    09-22-2014, 08:11 PM Go to last post
  47. Bivariate with Normal Probability plots.

    This is more of a conceptual question for a problem that I'm working on. My professor is asking questions about normal probability plots and I can't...

    Started by SilverStars‎, 09-22-2014 04:20 PM
    • Replies: 0
    • Views: 777
    09-22-2014, 04:20 PM Go to last post
  48. Need help with Linear regression model

    Hi, Need help to develop a model for the data set. I have attached a copy of all the variables with their parameter estimates and the p value. ...

    Started by Shashank Prasad‎, 09-22-2014 01:44 PM
    • Replies: 0
    • Views: 751
    09-22-2014, 01:44 PM Go to last post
  49. Regression model advice: 1 continuous DV, 2 binary and 1 continuous IV

    Hi- I'm trying to build a model to forecast/predict a continous dependant variable based on several predicting variables. 1 of them is categorical...

    Started by kdedrick‎, 09-22-2014 11:22 AM
    • Replies: 0
    • Views: 1,089
    09-22-2014, 11:22 AM Go to last post
  50. Multivariate linear regression analysis (multiple dependent variable, one independent

    I am trying to determine the reason why(and how many) people with health insurance do not fully use all of its benefits(like free flu vaccines). I am...

    Started by p_s‎, 08-03-2014 11:18 PM
    6 Pages
    1 2 3 ... 6
    • Replies: 75
    • Views: 10,760
    09-21-2014, 06:00 AM Go to last post
  51. Overdispersions and logistic regression

    Note the following comment on this: I have never been clear what the difference between grouped and ungrouped data is. My elements, notably...

    Started by noetsi‎, 09-19-2014 09:26 AM
    • Replies: 8
    • Views: 2,132
    09-20-2014, 08:04 AM Go to last post
  52. Adjusted R-squared

    Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

    Started by haralds‎, 09-18-2014 01:57 PM
    bootstrap simulation, linear regression
    • Replies: 6
    • Views: 1,521
    09-19-2014, 09:55 PM Go to last post
  53. Testing whether two related slopes/intercepts are different from each other

    Hi, I'm new and stuck. I want to see if the intercepts and slopes of two linear regression lines are significantly different. I thought I found...

    Started by Proinsias‎, 09-18-2014 08:39 PM
    intercept, intercept p value, linear regression, mancova, significance
    • Replies: 10
    • Views: 1,908
    09-19-2014, 01:43 AM Go to last post
  54. how to calculate R values

    Hello members, I have no of observation (n), no of predictors(k) and stand error of estimation(se). Can it be possible to calculate R or RSquare...

    Started by sb1‎, 09-18-2014 07:47 AM
    • Replies: 1
    • Views: 913
    09-18-2014, 11:31 AM Go to last post
  55. Question Coefficient of determination interpretation

    Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

    Started by bgst‎, 09-09-2014 07:51 AM
    • Replies: 4
    • Views: 1,404
    09-17-2014, 04:58 PM Go to last post
  56. Assumption of Linearity not fulfilled - what to do?

    Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

    Started by bluemuly‎, 09-17-2014 06:02 AM
    • Replies: 1
    • Views: 2,294
    09-17-2014, 02:53 PM Go to last post
  57. Help to prove the relationship of regression coefficients of total data and sub-data

    Hello, The regression of total data set is:Y=aX+b0 The total data set is divided to two data sets. The regressions of the two sub data sets are:...

    Started by Samuel1204‎, 09-15-2014 12:34 PM
    • Replies: 8
    • Views: 1,571
    09-16-2014, 11:44 PM Go to last post
  58. Geometric Slope

    I am reading a paper that in the "Methods", it is only stated multiple linear regression conducted. In the results it reports the "geometric slopes"...

    Started by hlsmith‎, 09-15-2014 11:29 AM
    • Replies: 2
    • Views: 969
    09-15-2014, 11:57 AM Go to last post
  59. Exclamation Interpretating poisson regression output correctly to wirte in results from R

    Hi. I've done a poisson regression on count data in r. I need to write up the results for it but have very little idea where to start because the p...

    Started by Francesca.123‎, 09-14-2014 07:13 AM
    glm regression, output, poisson, r-statisitcs, results
    • Replies: 0
    • Views: 1,359
    09-14-2014, 07:13 AM Go to last post
  60. Question Regression with 0 intercept

    Hi, I'm taking a regression analysis class and its been a while since I took calc (a few years ago) and Im having some trouble with doing proofs of...

    Started by SilverStars‎, 09-13-2014 02:06 PM
    • Replies: 3
    • Views: 1,285
    09-14-2014, 12:51 AM Go to last post

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