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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. REGRESSION are these real findings or outcomes of preexisting differences?

    Hi guys, I have a N=138 sample that consists of 56 participants form one country and 82 from another country. When i run a stepwise regressions...

    Started by coffeehipster‎, 11-15-2014 07:55 PM
    • Replies: 2
    • Views: 730
    11-17-2014, 07:27 PM Go to last post
  2. Dummy variables (and poster!)

    Hi, Could someone please help me understand dummy variables? If I had a variable which was “Religion” that was coded: 1 = Catholic 2 =...

    Started by Kenny‎, 11-16-2014 12:42 PM
    • Replies: 1
    • Views: 637
    11-16-2014, 03:52 PM Go to last post
  3. Interaction/Moderation Question

    So I know that the terms interaction and moderation are used pretty much interchangeably. However, is it possible for variables to interact without...

    Started by RER31‎, 11-14-2014 09:36 PM
    • Replies: 4
    • Views: 886
    11-16-2014, 08:42 AM Go to last post
  4. 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: 1,082
    11-14-2014, 11:12 AM Go to last post
  5. 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: 505
    11-14-2014, 11:08 AM Go to last post
  6. 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: 719
    11-14-2014, 10:58 AM Go to last post
  7. 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: 615
    11-14-2014, 07:17 AM Go to last post
  8. 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: 638
    11-12-2014, 11:10 AM Go to last post
  9. 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: 735
    11-10-2014, 01:07 PM Go to last post
  10. 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 04:19 PM
    • Replies: 4
    • Views: 927
    11-08-2014, 08:06 AM Go to last post
  11. 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: 583
    11-08-2014, 04:56 AM Go to last post
  12. 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 11:10 PM
    • Replies: 1
    • Views: 750
    11-07-2014, 09:35 AM Go to last post
  13. 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 01:08 PM
    logistic
    • Replies: 2
    • Views: 4,921
    11-03-2014, 10:04 PM Go to last post
  14. 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 06:44 PM
    • Replies: 0
    • Views: 713
    10-29-2014, 06:44 PM Go to last post
  15. 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 08:53 AM
    forecasting
    • Replies: 4
    • Views: 812
    10-29-2014, 09:46 AM Go to last post
  16. 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 06:12 PM
    heteroskeds
    • Replies: 0
    • Views: 572
    10-23-2014, 06:12 PM Go to last post
  17. 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 03:08 PM
    longitudinal study, regression analysis, repeated measures
    • Replies: 2
    • Views: 614
    10-23-2014, 05:56 AM Go to last post
  18. 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 11:53 PM
    series, temporal, time, time series
    • Replies: 5
    • Views: 1,148
    10-21-2014, 05:18 PM Go to last post
  19. 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 04:23 PM
    logistic regression
    • Replies: 3
    • Views: 1,083
    10-18-2014, 06:41 AM Go to last post
  20. 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 11:50 AM
    glm regression, negative values, regression
    • Replies: 0
    • Views: 556
    10-17-2014, 11:50 AM Go to last post
  21. 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 12:44 PM
    • Replies: 5
    • Views: 1,110
    10-16-2014, 02:50 PM Go to last post
  22. 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 11:24 PM
    forecasting, regression
    • Replies: 6
    • Views: 1,171
    10-15-2014, 01:45 PM Go to last post
  23. 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 12:10 PM
    • Replies: 1
    • Views: 736
    10-15-2014, 11:38 AM Go to last post
  24. 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 09:36 AM
    • Replies: 1
    • Views: 670
    10-14-2014, 12:24 PM Go to last post
  25. 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 08:45 AM
    • Replies: 1
    • Views: 891
    10-11-2014, 11:07 AM Go to last post
  26. 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 03:22 PM
    poisson regression
    • Replies: 0
    • Views: 764
    10-10-2014, 03:22 PM Go to last post
  27. 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 06:36 AM
    autocorrelation, time series regression
    • Replies: 3
    • Views: 1,203
    10-10-2014, 02:08 PM Go to last post
  28. 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 12:29 PM
    • Replies: 7
    • Views: 1,090
    10-10-2014, 02:02 PM Go to last post
  29. 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 01:39 AM
    • Replies: 0
    • Views: 582
    10-10-2014, 01:39 AM Go to last post
  30. 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 12:21 PM
    • Replies: 9
    • Views: 1,132
    10-09-2014, 07:36 PM Go to last post
  31. 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 02:36 PM
    • Replies: 3
    • Views: 747
    10-09-2014, 03:37 PM Go to last post
  32. 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 10:19 PM
    • Replies: 0
    • Views: 585
    10-08-2014, 10:19 PM Go to last post
  33. 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 05:34 AM
    • Replies: 1
    • Views: 683
    10-05-2014, 06:31 AM Go to last post
  34. 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 04:40 PM
    • Replies: 6
    • Views: 1,234
    10-04-2014, 11:47 AM Go to last post
  35. 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 01:42 PM
    fixed effect, longitudinal data, mixed effect models, random effect
    • Replies: 0
    • Views: 765
    10-02-2014, 01:42 PM Go to last post
  36. 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 03:40 PM
    cross validation, linear regression, regression, regularization, tuning, tuning parameter
    • Replies: 6
    • Views: 1,129
    10-01-2014, 08:09 PM Go to last post
  37. 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 08:51 AM
    gbm, prediction interval, prediction limits
    • Replies: 2
    • Views: 724
    10-01-2014, 03:08 PM Go to last post
  38. 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 12:08 PM
    ordinal regression, regression analysis, regression coefficients
    • Replies: 0
    • Views: 618
    10-01-2014, 12:08 PM Go to last post
  39. 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 12:20 PM
    • Replies: 4
    • Views: 1,163
    10-01-2014, 04:57 AM Go to last post
  40. 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 10:22 AM
    • Replies: 0
    • Views: 591
    09-30-2014, 10:22 AM Go to last post
  41. 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 12:07 PM
    • Replies: 2
    • Views: 789
    09-30-2014, 05:37 AM Go to last post
  42. 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 03:41 PM
    non linear regression, validation
    • Replies: 1
    • Views: 710
    09-30-2014, 05:32 AM Go to last post
  43. 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, 09-29-2014 12:30 AM
    linear regression, probability
    • Replies: 0
    • Views: 509
    09-29-2014, 12:30 AM Go to last post
  44. 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 10:43 AM
    cross sectional, ols regression
    • Replies: 0
    • Views: 689
    09-27-2014, 10:43 AM Go to last post
  45. Linear Regression

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

    Started by DDD‎, 09-25-2014 02:56 PM
    • Replies: 4
    • Views: 1,155
    09-25-2014, 05:28 PM Go to last post
  46. 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 04:18 AM
    • Replies: 0
    • Views: 698
    09-25-2014, 04:18 AM Go to last post
  47. 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 01:32 AM
    categorical data, r program, regression analysis, scaling
    • Replies: 3
    • Views: 1,052
    09-24-2014, 04:30 PM Go to last post
  48. 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 06:26 AM
    goodness of fit, logistic regression, regression
    • Replies: 0
    • Views: 587
    09-24-2014, 06:26 AM Go to last post
  49. 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 09:11 PM
    binary dependent variable, logistic regression
    • Replies: 0
    • Views: 646
    09-22-2014, 09:11 PM Go to last post
  50. 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 05:20 PM
    • Replies: 0
    • Views: 530
    09-22-2014, 05:20 PM Go to last post
  51. 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 02:44 PM
    • Replies: 0
    • Views: 514
    09-22-2014, 02:44 PM Go to last post
  52. 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 12:22 PM
    • Replies: 0
    • Views: 727
    09-22-2014, 12:22 PM Go to last post
  53. 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, 08-04-2014 12:18 AM
    6 Pages
    1 2 3 ... 6
    • Replies: 75
    • Views: 8,636
    09-21-2014, 07:00 AM Go to last post
  54. 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 10:26 AM
    • Replies: 8
    • Views: 1,292
    09-20-2014, 09:04 AM Go to last post
  55. 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 02:57 PM
    bootstrap simulation, linear regression
    • Replies: 6
    • Views: 1,200
    09-19-2014, 10:55 PM Go to last post
  56. 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 09:39 PM
    intercept, intercept p value, linear regression, mancova, significance
    • Replies: 10
    • Views: 1,542
    09-19-2014, 02:43 AM Go to last post
  57. 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 08:47 AM
    • Replies: 1
    • Views: 610
    09-18-2014, 12:31 PM Go to last post
  58. 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 08:51 AM
    • Replies: 4
    • Views: 1,164
    09-17-2014, 05:58 PM Go to last post
  59. 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 07:02 AM
    • Replies: 1
    • Views: 1,324
    09-17-2014, 03:53 PM Go to last post
  60. 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 01:34 PM
    • Replies: 8
    • Views: 1,265
    09-17-2014, 12:44 AM Go to last post

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