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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Analysis of promotional data by department

    Hi all, I have recently started an internship with a major UK retailer. My project is to come up with a model (and analysis) for promotions that...

    Started by cus003‎, 07-11-2013 02:44 PM
    • Replies: 6
    • Views: 1,191
    07-15-2013, 08:38 AM Go to last post
  2. Analytical linear regression?

    My lecturer stated that no method exists to determine the line of best fit for a set of data analytically. He went on to state that computers through...

    Started by striphe‎, 08-04-2011 06:32 AM
    • Replies: 6
    • Views: 5,261
    08-05-2011, 06:01 PM Go to last post
  3. Analytical solution to correlation between two linear combinations of values

    Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

    Started by BigBugBuzz‎, 09-12-2014 03:39 AM
    analytical solution, correlation
    • Replies: 3
    • Views: 1,741
    09-12-2014, 02:00 PM Go to last post
  4. analyzing residual plot by hand

    Hi! Thanks in advance for looking at my query. I have a very basic question regarding regression. We have to analyze a residual Plot by hand. We...

    Started by ealeql‎, 12-06-2010 07:42 PM
    • Replies: 1
    • Views: 7,812
    12-06-2010, 07:54 PM Go to last post
  5. Question Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    Im working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content tags...

    Started by stupidpoeticjustice‎, 06-01-2017 02:09 PM
    marketing, regression analysis, social network, statistics
    • Replies: 1
    • Views: 606
    06-02-2017, 12:10 AM Go to last post
  6. Ancova

    Hello, I'm trying to compare regression models of the same form between three groups. Each model has two continuous independent variables. I need...

    Started by gysr‎, 04-17-2007 09:23 AM
    • Replies: 0
    • Views: 2,152
    04-17-2007, 09:23 AM Go to last post
  7. ANCOVA - can I delete a very significant variable from a model's equation?

    Hi all, I undertook a sensitivity analysis to study the contribution of explanatory variables to soil organic carbon variations. Here, the...

    Started by CGG‎, 11-22-2015 05:38 PM
    ancova, variable in model
    • Replies: 5
    • Views: 1,191
    11-24-2015, 07:30 AM Go to last post
  8. ANCOVA and geography help

    For a GIS class project, I'm doing some research based on Christopher Rumh's 2000 paper Are Recessions Good for your Health? In it, he analyzes...

    Started by bryangoodrich‎, 11-02-2011 03:44 PM
    • Replies: 1
    • Views: 2,366
    11-03-2011, 03:09 AM Go to last post
  9. ANCOVA coding of categorical covariates

    Hello all, I am running an ANCOVA in R (Anova function) to assess the results of a randomized experimental study. I have a 2x2 full factorial...

    Started by Mark77‎, 01-28-2016 05:57 PM
    ancova, categorical covariates, gender
    • Replies: 0
    • Views: 928
    01-28-2016, 05:57 PM Go to last post
  10. Post ANCOVA controversy?

    Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

    Started by jhdc‎, 10-31-2009 04:43 PM
    • Replies: 3
    • Views: 12,044
    11-03-2009, 08:30 PM Go to last post
  11. ANCOVA with 4 IV's and 1 DV. Which IV is the moderator?

    Hi! My experiment is a Between-subjects factorial design. I used two scenario's. I want to perform a factorial ANOVA analysis with 4 IV's and 1...

    Started by Nadia1908‎, 09-27-2012 04:29 AM
    • Replies: 0
    • Views: 1,924
    09-27-2012, 04:29 AM Go to last post
  12. ANCOVA woes

    I'm having real trouble interpreting the output from my ANCOVA. I have two conditions control and experimental, my dependent variable is state...

    Started by ah428‎, 04-25-2014 02:13 PM
    • Replies: 0
    • Views: 1,565
    04-25-2014, 02:13 PM Go to last post
  13. Anomoly detection using regression

    Hi There, X1 X2 and X3 are three observations made on a system. All three variables are the response of the system and it is seen theoretically...

    Started by hnandan‎, 05-16-2011 06:58 PM
    • Replies: 0
    • Views: 1,860
    05-16-2011, 06:58 PM Go to last post
  14. Another question about regression

    First, thank you to John and Quark for responding to my question about multiple regression!!!! I have another question. I am using SPSS and...

    Started by Diane‎, 11-20-2005 12:17 PM
    • Replies: 1
    • Views: 3,675
    11-20-2005, 12:25 PM Go to last post
  15. Another question re: correlation and regression

    I seem to be getting confused between correlation and regression a bit... I'm trying to identify the relationship between a series of X variables...

    Started by arikel‎, 03-19-2008 01:25 PM
    • Replies: 3
    • Views: 2,465
    03-20-2008, 11:38 AM Go to last post
  16. Another Regression Question

    Hey everybody. I'm at it again with regression questions. If you have the time to help me with some questions I would appreciate it. Using...

    Started by USMstudent85‎, 10-14-2011 11:26 AM
    • Replies: 10
    • Views: 2,847
    10-14-2011, 01:37 PM Go to last post
  17. ANOVA - Does Welch's test assume homogeneity of variances, or not?

    In other words, will it return a much smaller standard error when variance are unequal than Fisher's? Or is it not concerned with variance?

    Started by bikingman‎, 12-28-2016 04:02 PM
    • Replies: 3
    • Views: 2,495
    12-28-2016, 09:46 PM Go to last post
  18. ANOVA and Multiple Regression DIFFERENT Result

    Using a data set I come up with this problem. The effects of A, B, and their interaction (A B) on Y are tested. The data are analyzed using both...

    Started by fayyazcivil‎, 01-21-2014 12:16 PM
    • Replies: 5
    • Views: 1,916
    01-21-2014, 01:19 PM Go to last post
  19. ANOVA confusions- Please Help

    Hello, I was wondering if you could please offer any advice as I appear to have got rather muddled. I am writing a resesarch proposal, and I...

    Started by GuineaPig‎, 12-09-2008 03:35 PM
    • Replies: 8
    • Views: 2,883
    12-10-2008, 11:14 PM Go to last post
  20. Anova find significant diferrences

    Hi all, I have made an one-way anova in order to test if three populations have the same means. My result is to reject the null hypothesis. So,...

    Started by petros20‎, 03-29-2016 12:43 PM
    • Replies: 4
    • Views: 1,331
    03-30-2016, 01:17 AM Go to last post
  21. Post ANOVA multi-variable problem

    If there is a dependent variable depending on 5 independent variables or factors, how to find the relative effect of these 5 groups on dependent...

    Started by prasun samir‎, 12-24-2015 09:12 PM
    • Replies: 3
    • Views: 1,953
    12-26-2015, 09:40 PM Go to last post
  22. Anova problems.........please help.thank you

    1.A study has been conducted to determine whether the mean spending for recreational activities during the month of August differs for residents of...

    Started by adeola1820‎, 04-23-2007 12:20 AM
    • Replies: 0
    • Views: 3,664
    04-23-2007, 12:20 AM Go to last post

    Dear All I am trying to get my head around when to use ANOVA when to use regeression and when to use REML. As I understand REML can be used in...

    Started by joanne1999‎, 06-27-2012 04:56 AM
    anova, correlation, regression, reml, unbalanced
    • Replies: 1
    • Views: 3,053
    06-29-2012, 12:24 PM Go to last post
  24. anova repeated measures with interaction term

    i hva been sitting here for 6 hours trying to figure out what i am doing wrong, but i cant figure it out. I am doing anova with repeated measures....

    Started by ama_nil‎, 02-12-2016 07:57 AM
    • Replies: 0
    • Views: 1,055
    02-12-2016, 07:57 AM Go to last post
  25. ANOVA table insignificant in Regression

    Greetings!!! Regression analysis produced ANOVA table insignificant. Please confirm if I should report regression results. Thanks Rayyan

    Started by itsrayyan‎, 09-19-2010 04:51 PM
    • Replies: 6
    • Views: 12,879
    09-23-2010, 04:43 PM Go to last post
  26. ANOVA vs. principal component analysis for nonlinear analysis

    First, let me say that I am not a trained statistician by any means. Here's what I'm working on. I have a dataset with 8 factors (sample attached)....

    Started by huelskbc‎, 06-08-2014 01:49 PM
    • Replies: 2
    • Views: 2,979
    06-19-2014, 12:07 PM Go to last post
  27. ANOVA with multiple imputed Data

    Hello :) I used multiple imputation on my data to get a complete data set. I want to do a ANOVA now. Does anybody know how to do that correctly? ...

    Started by froop91‎, 09-06-2017 04:37 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 967
    09-15-2017, 04:15 AM Go to last post
  28. Anova/Linear regression

    I have two datasets, one collected by one instrument, say A, and one by another, say B, at the same time. I need to use instrument B to calibrate...

    Started by jenny_stats‎, 01-30-2017 05:45 AM
    • Replies: 0
    • Views: 1,804
    01-30-2017, 05:45 AM Go to last post
  29. Question ANOVA/MANOVA for a complex data matrix

    Hi friends, I've got a data matrix with 140 rows and 5 columns. Each row represents a unique characteristic of the 5 different plant species. Idea...

    Started by vikie‎, 02-09-2012 06:34 AM
    anova, mlm
    • Replies: 4
    • Views: 2,063
    08-21-2013, 02:20 AM Go to last post
  30. Any data transformation needed for Pearson and Multiple regression?

    I want to run a Pearson's r and also multiple regresssion between a DV and some IVs. The DV is measured in percentages as well as some of my IVs. The...

    Started by angoslezq‎, 04-19-2010 01:14 PM
    • Replies: 0
    • Views: 2,859
    04-19-2010, 01:14 PM Go to last post
  31. Any good online lectures of time series introduction?

    Hello all: I'm looking to find "good" online videos that provide an introduction to time series analysis (some of the basics, applications....). ...

    Started by lancearmstrong1313‎, 08-05-2013 01:16 PM
    • Replies: 1
    • Views: 4,036
    08-05-2013, 01:50 PM Go to last post
  32. Question Any software to get sample size/power analysis for probit regression?

    Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

    Started by SabbyATL‎, 09-14-2011 04:12 AM
    • Replies: 12
    • Views: 7,942
    09-19-2011, 12:06 PM Go to last post
  33. Anyone familiar with this statistical paradox?

    I have discovered an interesting statistical paradox. If you familiar with it, please, let me know about its conventional name (or author's name) and...

    Started by Alex777777‎, 01-20-2015 04:25 AM
    • Replies: 0
    • Views: 1,234
    01-20-2015, 04:25 AM Go to last post
  34. Apples-to-apples needs same trend fn form between cases?

    Hi A rather conceptual question, if someone could perhaps illuminate: I am investigating possible correlation between an independent and...

    Started by svenoxtoby‎, 08-10-2010 05:00 AM
    • Replies: 0
    • Views: 2,201
    08-10-2010, 05:00 AM Go to last post
  35. application of regression model - which one to choose? please help

    Hi all, for my master thesis I would like to investigate the human impact on behavior of sea lions. I have 3 different defined response variables...

    Started by KathiF‎, 11-17-2011 11:34 AM
    • Replies: 10
    • Views: 3,124
    11-22-2011, 02:03 PM Go to last post
  36. Applied linear regression model

    any one can tell me the "real life application of linear model" with example ????

    Started by ameeq7746‎, 12-01-2013 07:59 AM
    • Replies: 0
    • Views: 1,436
    12-01-2013, 07:59 AM Go to last post
  37. Applying estimated model coefficients to subunit level

    Hi, I have a question about whether it is okay to apply regression coefficients to predict scores at the nested subunit level. I have a natural...

    Started by HiLo‎, 08-29-2012 09:41 PM
    • Replies: 0
    • Views: 1,501
    08-29-2012, 09:41 PM Go to last post
  38. Applying multiple regression results to new data SPSS

    My study involves testing infants at multiple time points using a number of behavioural tests. I used a multiple regression to establish which...

    Started by rdavis09‎, 12-05-2015 10:05 AM
    • Replies: 3
    • Views: 1,983
    12-06-2015, 04:17 AM Go to last post
  39. Applying SEM model to mutually exclusive smaller datasets

    Hello, I have an SEM model I am happy with and I am examining the standardized path coefficients. Then when I split the original data set into...

    Started by leylay‎, 06-03-2011 01:19 PM
    path coefficients, pathway model, sem, structural equation model
    • Replies: 2
    • Views: 2,197
    06-04-2011, 11:48 PM Go to last post
  40. Approaches for multivariate nonlinear parametric regression?

    I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a...

    Started by stevehollx‎, 03-24-2015 12:50 PM
    • Replies: 1
    • Views: 1,138
    03-24-2015, 06:45 PM Go to last post
  41. Appropriate Coding of DV in logistic regression

    Good morning! I have the following problem with a logistic regression that relates German graduates' attributes (subject, univerity type, degree,...

    Started by siskin‎, 08-23-2011 08:02 AM
    • Replies: 2
    • Views: 3,537
    08-30-2011, 02:43 AM Go to last post
  42. Appropriate logistic regression model to control for confounders?

    I am working with a cross-sectional study sample (N=601). The goal of my research is to investigate if there is an association between a disease (X)...

    Started by CarlAH‎, 02-18-2011 04:26 PM
    • Replies: 2
    • Views: 9,804
    02-18-2011, 05:20 PM Go to last post
  43. Appropriate MANCOVA interaction graph

    Hi all, I was hoping to get some help with how best to graph my MANCOVA interaction. I know performing this with univariate data (ANCOVA) is...

    Started by michaela‎, 11-14-2013 10:38 PM
    • Replies: 0
    • Views: 1,471
    11-14-2013, 10:38 PM Go to last post
  44. Appropriate model for (repeated) data

    I have some cross-sectional data, where I'm interested in estimating a relationship between the "number of items in use" in sector i of country j and...

    Started by longshot‎, 08-01-2014 07:58 PM
    regression analysis, regression equation, regression models, repeated cases, repeated measurements
    • Replies: 0
    • Views: 1,434
    08-01-2014, 07:58 PM Go to last post
  45. Angry Appropriate null hypothesis for a two-stage regression

    Hi thanks everyone for your help in advance. Im working on a two-stage regression, in which a coefficient from the first regression is used as an...

    Started by Daoist‎, 04-23-2012 08:25 AM
    hypothesis testing, multistage, null hypothesis, two stage
    • Replies: 0
    • Views: 1,395
    04-23-2012, 08:25 AM Go to last post
  46. Appropriate regression for dependent count data and independent "not count data"

    Hello, My independent data are continuous variables. My dependent variable is count data. I want to use regression to look for a relationship. ...

    Started by nofunsally‎, 06-06-2011 11:57 PM
    binomial, count data, poisson, regression
    • Replies: 2
    • Views: 4,109
    06-07-2011, 02:32 PM Go to last post
  47. Appropriate Regression Method?

    Hi guys, I'm relatively new to statistics, and I'm searching for an answer as to which regression method would be most appropriate for the problem...

    Started by MMack‎, 01-05-2015 11:22 PM
    • Replies: 4
    • Views: 1,990
    01-07-2015, 06:39 PM Go to last post
  48. Appropriate Statistical Method :: Nonlinear Dynamic System Identification

    Hey, I should probably mention beforehand, that I am relatively new to statistics. My problem is the following: I am doing nonlinear dynamic...

    Started by Coooky‎, 08-06-2011 08:31 AM
    • Replies: 0
    • Views: 1,592
    08-06-2011, 08:31 AM Go to last post
  49. Appropriate Statistical Test

    just wondering what kind of test of statistical test i could do to test this: The data i have are all continuous variables (Coral Size (cm^2), Fish...

    Started by playdium‎, 07-20-2013 10:17 AM
    • Replies: 3
    • Views: 2,409
    07-22-2013, 01:23 PM Go to last post
  50. Appropriateness of fixed effect model for temporal/ spatial effects (Ecology)

    Hello, I hope you can help me with this. I'm in the throes of finishing my masters thesis, and am stumbling on my model. I've talked a lot with...

    Started by jeskill‎, 08-31-2012 10:37 AM
    • Replies: 5
    • Views: 2,412
    09-01-2012, 10:54 AM Go to last post
  51. 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: 1,156
    10-10-2014, 12:39 AM Go to last post
  52. Cool Approximating the probability of an event occuring from the output of a Poisson GLM

    Hi all, I have some data that includes the output of a Poisson Log Link model, that aims to predict how many times an event will occur over the...

    Started by skinicod‎, 10-08-2016 09:47 AM
    glm, log link, poisson
    • Replies: 2
    • Views: 1,570
    10-10-2016, 11:15 AM Go to last post
  53. Are my residuals normal?

    Hi there, I have performed a multiple regression analysis and am checking the assumptions. The normal probability plot is not exactly a straight...

    Started by bradyj2‎, 09-05-2012 08:01 AM
    • Replies: 9
    • Views: 2,202
    09-05-2012, 06:17 PM Go to last post
  54. Are there model specification tests for Two Stage Least Squares (2SLS)?

    Question. Are there model specification tests for Two Stage Least Squares (2SLS)? I am trying to estimate the parameters (B1, B2, B3) of the...

    Started by Socks‎, 08-21-2014 01:23 AM
    • Replies: 0
    • Views: 1,322
    08-21-2014, 01:23 AM Go to last post
  55. Are these models nested?

    I have three logistic regression models. Model 1 is the reference model with covariates GA + BW. Model 2 is a quadratic model with GA + BW +...

    Started by SiBorg‎, 11-11-2012 06:22 AM
    • Replies: 9
    • Views: 3,710
    11-11-2012, 04:37 PM Go to last post
  56. Arima dummy regression arimax

    Dear All, Below is t-shirt sales data for 2011 and 2012 from week 14 to 40. DummyDad is father's day, dummyceleb is the celebration week that...

    Started by masarimk‎, 09-03-2012 11:58 AM
    arima dummy regression
    • Replies: 0
    • Views: 2,100
    09-03-2012, 11:58 AM Go to last post
  57. ARIMA estimation technique

    Hello, I am using SAS to forecast with ARIMA. I need to choose between two methods, conditional least Squares and MLE. Which technique do you...

    Started by schteeke1‎, 05-10-2017 07:27 AM
    arima mle cls
    • Replies: 8
    • Views: 2,079
    05-13-2017, 01:03 PM Go to last post
  58. ARIMA Modelling

    I'm performing some ARIMA modelling on time series data for UK energy consumption for my dissertation at university. At a bit of a loss though. So...

    Started by Hazbuk‎, 12-12-2013 06:49 AM
    • Replies: 10
    • Views: 2,448
    12-17-2013, 09:47 AM Go to last post
  59. arima multiple periods

    Dear All, I have t-shirt sales data from week 14 to 40 weeks for 2011 and 2012, thus I have 50 data weeks(2012 is not completed yet). I defined my...

    Started by masarimk‎, 09-06-2012 03:55 AM
    • Replies: 2
    • Views: 1,728
    09-10-2012, 03:53 AM Go to last post
  60. ARMA Model Output & Excel

    Dear All, I am using my Eviews Output of an ARMA Model, taking the coefficients in other to perform my Forecasts in Excel. However, I am not being...

    Started by joaom‎, 04-18-2014 12:51 PM
    • Replies: 1
    • Views: 3,246
    04-19-2014, 07:41 AM Go to last post

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