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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Help with creating a dummy variable with a categorical variable.

    I am very new to stats and this is not my thing. I need help in a class with creating dummy variables for the variable "education level". Im not...

    Started by cwcannon‎, 12-07-2014 10:06 PM
    • Replies: 1
    • Views: 1,091
    12-08-2014, 02:54 AM Go to last post
  2. Comparison of 2 models with observed data - identical R2?

    Hello! I am trying to compare field data with 2 models, but somehow both models give me identical R2. The models are derived from different sets...

    Started by iloveapple‎, 12-07-2014 06:49 AM
    r2 regression
    • Replies: 0
    • Views: 764
    12-07-2014, 06:49 AM Go to last post
  3. Multi-Level Options for Dataset

    Hello, I have a dataset of 15 subjects. Each subject has 12 scores that come from performing 7 tasks, so I have a total of 180 scores. The...

    Started by hlsmith‎, 12-05-2014 09:48 AM
    • Replies: 0
    • Views: 826
    12-05-2014, 09:48 AM Go to last post
  4. Regression analysis with nominal dependent variable

    Hello! In short: I'm having issues with figuring out a technique to measure how well does a categorical variable explain variation among a nominal...

    Started by Jüri‎, 12-03-2014 08:30 AM
    analysis, dependent, nominal, regression, variable
    • Replies: 3
    • Views: 1,218
    12-05-2014, 08:38 AM Go to last post
  5. OLS with dummy and few observations (12 mean values from 2.5k observations)

    Hi all :) Maybe you can help me with a problem I have in using OLS regression: I have a dataset of 12 markets, in total ~2.5k trades happened...

    Started by callino‎, 12-04-2014 08:08 AM
    • Replies: 1
    • Views: 1,140
    12-04-2014, 09:17 AM Go to last post
  6. Simple Logistic Regression

    Hey everyone, I had a question with respect to SLR. In Block 0: my classification table predicts 89.3% In Block 1: my classification table...

    Started by natenator‎, 12-02-2014 06:28 PM
    • Replies: 2
    • Views: 968
    12-03-2014, 04:31 AM Go to last post
  7. Significance of constant - Mean adjusted values vs. Z scores

    Hello everyone, I am trying to run a regression analysis on 2 Inputs and their relationship with 1 Outcome variable across a number of products. I...

    Started by Londoner‎, 11-30-2014 08:39 PM
    • Replies: 5
    • Views: 1,392
    12-02-2014, 10:23 PM Go to last post
  8. Best model time series regression

    I am about to start using regression models to predict future trends. I am not sure how one choses the best of various alternative models. I assume...

    Started by noetsi‎, 12-02-2014 04:38 PM
    • Replies: 2
    • Views: 772
    12-02-2014, 05:44 PM Go to last post
  9. bonferroni correction in multivariate regression

    hi, I just read something that made me think about this, the p-values we calculate in a multiple regression have no adjustment for multiple test (...

    Started by rogojel‎, 11-06-2014 01:00 PM
    2 Pages
    1 2
    bonferroni, multiple regressiom, significance
    • Replies: 27
    • Views: 5,180
    12-01-2014, 06:34 PM Go to last post
  10. What type of regression to use here

    This article shows two regression models an older simpler one and a later more complex one. They never identify the type of regression used. The...

    Started by noetsi‎, 12-01-2014 03:18 PM
    • Replies: 0
    • Views: 950
    12-01-2014, 03:18 PM Go to last post
  11. Measurement method for DV changed during longitudinal study

    Hi All, I'm using regression analysis (multilevel linear and logistic) on a measure of children's health behaviours over 5 time-points of data. I...

    Started by Colonel‎, 11-30-2014 07:22 PM
    • Replies: 0
    • Views: 922
    11-30-2014, 07:22 PM Go to last post
  12. Measurement method for DV changed during longitudinal study

    Hi All, I'm performing a data analysis on a dataset I didn't do the collection for, and I am contending with some odd decisions made by the people...

    Started by Colonel‎, 11-30-2014 06:36 PM
    • Replies: 0
    • Views: 633
    11-30-2014, 06:36 PM Go to last post
  13. Bootstrap

    Hey, I am new to this forum and I have a question about Bootstrapping. I want to calculate some critical values. The data generating process is...

    Started by rantamblan‎, 11-29-2014 10:45 AM
    • Replies: 2
    • Views: 1,559
    11-30-2014, 05:45 AM Go to last post
  14. Assistance with Linear Regression Model (Model is Not Full Rank)

    Hello all, I'm currently doing a project in a computer statistics class of mine, and I have run into some potential trouble. I'll admit, I'm not...

    Started by BarnabyJones21‎, 11-29-2014 02:44 PM
    • Replies: 0
    • Views: 907
    11-29-2014, 02:44 PM Go to last post
  15. Hedonic regression

    What is the rationale behind hedonic quality index and how to interpret it? For any example/explanation beside the Wikipedia, I would be very...

    Started by john_f‎, 11-28-2014 03:25 PM
    multiple regression, regression
    • Replies: 0
    • Views: 894
    11-28-2014, 03:25 PM Go to last post
  16. Regression Analysis for comparison of crime rates across a river

    I need a bit of help refining a regression comparing crime rates of counties separated by a river. My current equation looks like: ...

    Started by acoll‎, 11-25-2014 04:43 PM
    • Replies: 1
    • Views: 1,099
    11-27-2014, 10:31 PM Go to last post
  17. Post Newbie question why we use regression ?

    Hello , Can someone explain to me why we use regression analysis , it will help us in understanding what ? , what we will gain from doing regression...

    Started by hanialbarni‎, 11-27-2014 10:00 PM
    • Replies: 2
    • Views: 774
    11-27-2014, 10:28 PM Go to last post
  18. What is the “pdm” stat in the “rms” R package?

    I am new to the world of Regression in statistics and I have been doing a research in which I am building an ordinal logistic regression model (ORM)....

    Started by danielalencar‎, 11-27-2014 07:17 PM
    measurement, orm, pdm, regression, rms
    • Replies: 0
    • Views: 2,609
    11-27-2014, 07:17 PM Go to last post
  19. Interpreting multiple regression beta values

    Basic question here but just want to double check my understanding.. When I do a multiple regression I get beta values b1=0.01 and b2=0.7 This...

    Started by jfw13‎, 11-27-2014 11:43 AM
    beta values, regression
    • Replies: 5
    • Views: 1,169
    11-27-2014, 03:33 PM Go to last post
  20. Guidance needed

    I am in healthcare and I want to predict future volume (primarily just the end of the current month). The problem I have with using a traditional...

    Started by psrs0810‎, 11-24-2014 08:03 PM
    • Replies: 2
    • Views: 1,082
    11-25-2014, 04:42 PM Go to last post
  21. Panel Data: Add Fixed Effects Before or After Controls?

    Hi all, I'm using 51 entities with seven independent variables. Is it typically better to add entity/time fixed effects at the beginning or at the...

    Started by GWStudent‎, 11-25-2014 12:27 AM
    panel data
    • Replies: 0
    • Views: 1,027
    11-25-2014, 12:27 AM Go to last post
  22. Smile Running multple, multiple regressions? which statistical test should i use?

    I have done a study on whether personality and demographics predict interaction on facebook brand pages. I have used a Big five personality scale...

    Started by arnika‎, 11-21-2014 09:22 AM
    correlation, regression, spss
    • Replies: 5
    • Views: 1,500
    11-22-2014, 08:18 AM Go to last post
  23. Regression analysis with independant variable (error) and multiple dependant variable

    So I took a lot of data (~10000) on a machine (3D printer). For each reading, I got the error and a lot of different parameter (speed, voltage,...

    Started by Elok‎, 11-18-2014 01:25 PM
    2 Pages
    1 2
    linearity, regression analysis
    • Replies: 26
    • Views: 4,963
    11-21-2014, 08:24 AM Go to last post
  24. Analyse a variable as continuous and as categorical

    Hello everybody I performed a univariate analysis of a set of predictors. My plan was to include the significant predictors in a multivariate cox...

    Started by noob‎, 11-20-2014 04:01 PM
    • Replies: 3
    • Views: 1,398
    11-21-2014, 08:14 AM Go to last post
  25. Double Regression?

    I am looking at two years of financial info by month. I need to project out next month - however, at the end of our one fiscal year there was a...

    Started by psrs0810‎, 11-20-2014 10:11 AM
    • Replies: 1
    • Views: 828
    11-20-2014, 03:08 PM Go to last post
  26. Mathematical calculation in Access

    I have a math problem and I want to ask me pomognete.I working on complex desktop database.My main point is making the application for the simulation...

    Started by j235‎, 11-18-2014 04:38 PM
    • Replies: 1
    • Views: 970
    11-18-2014, 05:16 PM Go to last post
  27. SVAR parameter standard errors

    Hi everyone, How to calculate the standard errors of SVAR parameters. I know how to estimate it for contemporaneous parameter. I want to know how...

    Started by cjiang3‎, 11-17-2014 12:55 PM
    svar, var
    • Replies: 2
    • Views: 2,241
    11-18-2014, 09:27 AM Go to last post
  28. 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: 1,182
    11-17-2014, 07:27 PM Go to last post
  29. 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: 965
    11-16-2014, 03:52 PM Go to last post
  30. 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: 1,480
    11-16-2014, 08:42 AM Go to last post
  31. 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: 2,604
    11-14-2014, 11:12 AM Go to last post
  32. 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: 841
    11-14-2014, 11:08 AM Go to last post
  33. 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: 1,181
    11-14-2014, 10:58 AM Go to last post
  34. 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: 1,821
    11-14-2014, 07:17 AM Go to last post
  35. 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: 1,122
    11-12-2014, 11:10 AM Go to last post
  36. 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: 1,167
    11-10-2014, 01:07 PM Go to last post
  37. 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: 1,151
    11-08-2014, 08:06 AM Go to last post
  38. 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: 828
    11-08-2014, 04:56 AM Go to last post
  39. 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: 1,205
    11-07-2014, 09:35 AM Go to last post
  40. 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
    logistic
    • Replies: 2
    • Views: 7,470
    11-03-2014, 10:04 PM Go to last post
  41. 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: 1,144
    10-29-2014, 05:44 PM Go to last post
  42. 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
    forecasting
    • Replies: 4
    • Views: 1,590
    10-29-2014, 08:46 AM Go to last post
  43. 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
    heteroskeds
    • Replies: 0
    • Views: 907
    10-23-2014, 05:12 PM Go to last post
  44. 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: 1,045
    10-23-2014, 04:56 AM Go to last post
  45. 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: 2,307
    10-21-2014, 04:18 PM Go to last post
  46. 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: 1,690
    10-18-2014, 05:41 AM Go to last post
  47. 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: 850
    10-17-2014, 10:50 AM Go to last post
  48. 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: 1,916
    10-16-2014, 01:50 PM Go to last post
  49. 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: 1,922
    10-15-2014, 12:45 PM Go to last post
  50. 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: 1,026
    10-15-2014, 10:38 AM Go to last post
  51. 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: 1,159
    10-14-2014, 11:24 AM Go to last post
  52. 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: 1,948
    10-11-2014, 10:07 AM Go to last post
  53. 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: 1,140
    10-10-2014, 02:22 PM Go to last post
  54. 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: 2,448
    10-10-2014, 01:08 PM Go to last post
  55. 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: 1,633
    10-10-2014, 01:02 PM Go to last post
  56. 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: 894
    10-10-2014, 12:39 AM Go to last post
  57. 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: 2,163
    10-09-2014, 06:36 PM Go to last post
  58. 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: 1,243
    10-09-2014, 02:37 PM Go to last post
  59. 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: 852
    10-08-2014, 09:19 PM Go to last post
  60. 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: 1,003
    10-05-2014, 05:31 AM Go to last post

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