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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Question How to minimize volatility in dataset?

    Hi guys, We are currently struggling with a bit of an issue with regards to multiple regression. It concerns how to deal with substantial...

    Started by DJB86‎, 03-31-2016 09:46 AM
    • Replies: 2
    • Views: 627
    03-31-2016, 12:31 PM Go to last post
  2. Multiple regression with interaction - and dummy variables?

    Hi guys! So, here's the deal. I'm in a bit of a pickle here :shakehead I'm currently struggling with a take-home exam where I'm having trouble...

    Started by DJB86‎, 03-29-2016 08:55 PM
    • Replies: 9
    • Views: 1,269
    03-31-2016, 09:07 AM Go to last post
  3. Chi Square and Regression

    Hi all, First time post so please go easy on me :p I have a bunch of categorical variables that I am thinking of using as predictor variables...

    Started by Bathy1‎, 03-29-2016 03:09 PM
    • Replies: 3
    • Views: 1,046
    03-30-2016, 12:18 PM Go to last post
  4. Comparing betas with log transformation of independent variable

    Hi all, I would like to compare the results of three studies. All use linear regression with continuous independent and dependent variables. The...

    Started by orangetrout‎, 03-30-2016 06:35 AM
    • Replies: 0
    • Views: 1,343
    03-30-2016, 06:35 AM Go to last post
  5. 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
    anova
    • Replies: 4
    • Views: 862
    03-30-2016, 01:17 AM Go to last post
  6. Problem with residual?

    I don't know if this is an issue or not. There are the strange bars on the top and bottom of the residuals - I have never seen anything like this and...

    Started by noetsi‎, 03-29-2016 10:53 AM
    • Replies: 7
    • Views: 1,148
    03-29-2016, 12:47 PM Go to last post
  7. How to report a non-significant regression?

    Hi guys, For my final year research project, I have a few regression models with non-significant results. I was just wondering what the...

    Started by twinpeaks‎, 03-27-2016 08:38 AM
    • Replies: 4
    • Views: 4,403
    03-29-2016, 03:45 AM Go to last post
  8. Ordinal or Multinomial Regression

    Hi, If I have a variable called time spend following politics with the following possible responses: No time under half an hour a day...

    Started by DGM1‎, 03-28-2016 03:30 AM
    • Replies: 5
    • Views: 904
    03-28-2016, 06:16 PM Go to last post
  9. Logistic regression interpretation

    Can anyone please interpret these results for me i will be highly obliged. Thank you B S.E. Wald Sig. Do you know the doses of every pesticide...

    Started by Farhan‎, 03-26-2016 07:41 AM
    • Replies: 3
    • Views: 985
    03-28-2016, 02:35 PM Go to last post
  10. Basic regressionquestion

    Hi, I am currently learning ML algorithms and implementing in R. I have a some basic questions. 1.)I know that linear regression an statistical...

    Started by chakravarty456‎, 03-28-2016 05:16 AM
    • Replies: 2
    • Views: 795
    03-28-2016, 10:59 AM Go to last post
  11. Instrumental variable approach in case of interacting endogenous predictors

    Hello dear forum members, Suppose I have the following model: y = a + x1 + x2 + z1 + z2 + z1*z2, where y is exponential, x1-x2 are controls,...

    Started by kiton‎, 03-15-2016 12:13 PM
    • Replies: 6
    • Views: 1,307
    03-26-2016, 12:59 PM Go to last post
  12. How to calculate the percentage contribution in full factorial and RSM models

    Hi, My question might seem quiet straight forward but here it goes: How can I calculate the percentage contribution of each input parameter in...

    Started by khalchris‎, 03-25-2016 08:04 PM
    anova, full factorial, rsm
    • Replies: 0
    • Views: 1,296
    03-25-2016, 08:04 PM Go to last post
  13. Proper Interpretation of odds ratio less than 1 for my study

    Hello everyone, This is for a PhD, research in psycholinguistics. I have done logistic regression analyses where some chosen predictor...

    Started by MariaF‎, 07-22-2013 04:08 PM
    2 Pages
    1 2
    odds ratio invertibility, odds ratio less than 1
    • Replies: 18
    • Views: 26,168
    03-25-2016, 03:55 PM Go to last post
  14. Bidirectional relationship with longitudinal data: what's the best model?

    N=1000+. I have about 3-4 repetitive measures of a few numerical variables and categorical variables. How do I test the hypothesis that x...

    Started by neuromniscience‎, 03-23-2016 10:37 AM
    • Replies: 3
    • Views: 1,519
    03-23-2016, 09:29 PM Go to last post
  15. Low-prevalence covariates in multiple linear regression analysis

    Is there any problem adding low-prevalence covariates to standard multiple linear regression (spontaneous entry)? For example, I have 1000+...

    Started by neuromniscience‎, 03-22-2016 08:59 PM
    • Replies: 2
    • Views: 671
    03-23-2016, 07:59 PM Go to last post
  16. Post Regression individual and group-level data

    Hi all, I'm testing whether observing behavior leads to copying behavior (monkey see, monkey do) in a team setting. I've collected data from...

    Started by Tijnvanlier‎, 03-22-2016 01:50 PM
    • Replies: 3
    • Views: 962
    03-23-2016, 07:40 PM Go to last post
  17. Smile Predicted Probability

    Someone created a spreadsheet to graph predicted provability values on a Logistic Regression S Graph. There are four values used. a = Assumed...

    Started by R0NR0NS‎, 03-22-2016 10:43 AM
    • Replies: 2
    • Views: 765
    03-22-2016, 05:17 PM Go to last post
  18. Post Compare Correlation Coefficients

    Hi everyone, I currently have to do an empirical work in Stata and need some help. I have a regression in this form and want to compare the...

    Started by Swag1992‎, 03-22-2016 11:31 AM
    • Replies: 0
    • Views: 551
    03-22-2016, 11:31 AM Go to last post
  19. Both categorical and continuous predictors?

    I'm sure this is very simple but I just want to be sure. I have actually been searching the web for a while now and can't seem to find a clear...

    Started by dt87‎, 03-21-2016 01:02 AM
    • Replies: 5
    • Views: 1,384
    03-21-2016, 04:35 PM Go to last post
  20. Question Help with mixed model?

    I would appreciate some help figuring out how to analyze a new data set I'm collecting. Most of my experience is with linear regression and ANOVA,...

    Started by tbrass‎, 03-19-2016 03:49 PM
    • Replies: 3
    • Views: 990
    03-21-2016, 09:52 AM Go to last post
  21. Dummy variables with categorical data with multiple levels.

    This always seemed easy to me, largely because I always had an obvious reference group before or I was dealing with variables that had only 2 levels....

    Started by noetsi‎, 02-28-2016 07:44 PM
    • Replies: 12
    • Views: 2,000
    03-21-2016, 08:13 AM Go to last post
  22. Logistic regression in SPSS

    I have designed a question and now intend to use SPSS to run regression to analyse the results: My dependent variable is: intention to vote. Yes...

    Started by matthewrog‎, 03-19-2016 11:11 AM
    dummy variable, likert scale, logistic regression, ordinal regression, spss
    • Replies: 0
    • Views: 816
    03-19-2016, 11:11 AM Go to last post
  23. Skew in data

    I have a huge data set, 10,000 points is common. I have significant skew in my data and some large outliers. Some authors argue addressing skew with...

    Started by noetsi‎, 03-14-2016 08:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 2,180
    03-18-2016, 05:06 PM Go to last post
  24. "Sensitivty" analysis

    I have not encountered this before. It occurs in the context of "mixed effects OLS regression" (not sure exactly what type of regression that is...

    Started by noetsi‎, 03-18-2016 01:31 PM
    • Replies: 4
    • Views: 1,070
    03-18-2016, 04:10 PM Go to last post
  25. Intercept becoming negative(More IDVs)

    Hi All, I have a small query. When regressing revenue against cost, my intercept is positive for X% combos where each combo consists of data...

    Started by vikash_124124‎, 03-18-2016 01:57 AM
    • Replies: 6
    • Views: 904
    03-18-2016, 04:08 PM Go to last post
  26. Introductory references about total least squares

    I am an engineering student and I've been recently told about the Total Least Square (TLS) method. I am interested in applying it to topographic...

    Started by julitocolon‎, 03-18-2016 10:14 AM
    least-squares, orthogonal regression, references, regression, total least squares
    • Replies: 1
    • Views: 528
    03-18-2016, 10:37 AM Go to last post
  27. Partial effect plot: Which options do I have?

    Hi, I have a multiple regression model, and I would like to do an effect plot with confidence bands regarding one of the predictors. One solution...

    Started by mmercker‎, 03-16-2016 11:38 AM
    confidence bands, effect plot, regression plot
    • Replies: 4
    • Views: 1,189
    03-17-2016, 02:21 AM Go to last post
  28. Cool Research Method questions

    Thanks guys for the response, it was great

    Started by jazeid05‎, 03-15-2016 08:29 PM
    • Replies: 3
    • Views: 768
    03-16-2016, 10:29 AM Go to last post
  29. Prediction Plot with CI's: What to do with covariates?

    Hi, I have a multiple regression model (especially a GLMM), with - outcome Y, - a fixed effect predictor wich is in the main focus of...

    Started by mmercker‎, 03-15-2016 05:21 AM
    confidence interval, partial effect, regression plot
    • Replies: 0
    • Views: 711
    03-15-2016, 05:21 AM Go to last post
  30. MSE vs variance of residuals

    Can someone help me understand the distinction between the Mean Square Error and the variance of the residuals i)] in a linear regression? I thought...

    Started by pgseye‎, 03-15-2016 04:28 AM
    • Replies: 0
    • Views: 1,804
    03-15-2016, 04:28 AM Go to last post
  31. Use of partial regression plots to check for non-linearity

    These are commonly recommended to detect non-linearity in interval level predictors. I ran these in SAS and I have a difficult time interpreting the...

    Started by noetsi‎, 03-11-2016 01:53 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 2,648
    03-14-2016, 03:28 PM Go to last post
  32. Fishing with data: Use of multiple regressions on the same data set

    I have approached this issue, running multiple models with the same data set usually in the context of FW error . It is the habit of running multiple...

    Started by noetsi‎, 03-14-2016 11:31 AM
    • Replies: 2
    • Views: 1,109
    03-14-2016, 01:25 PM Go to last post
  33. Linear regression vs logistic regression

    I have a time series dataset. The, X (Independent variable) is time and is denoted as 1,2,3,4,5,6..1000.etc Y (Dependent variable ) is a...

    Started by Mukund‎, 03-12-2016 09:54 AM
    linear regression, logistic regression
    • Replies: 2
    • Views: 995
    03-14-2016, 08:28 AM Go to last post
  34. Test of non-linearity

    How do you actually test for non-linearity in linear regression. I have heard Box-Tidwel test mentioned, but I have yet to find out how you do it. ...

    Started by noetsi‎, 03-11-2016 09:27 AM
    • Replies: 0
    • Views: 560
    03-11-2016, 09:27 AM Go to last post
  35. Unhappy Regression: DV is Revenue and IDV is cost. (Very High MAPE)

    Need help on one of the modelling assignment. My dependent variable is Revenue and the independent variable is Cost beside some other variables...

    Started by vikash_124124‎, 03-09-2016 01:47 AM
    mape, regression
    • Replies: 8
    • Views: 1,344
    03-11-2016, 09:24 AM Go to last post
  36. (Poisson/NegBin, RE) Estimation of time-invariant predictors in a panel model

    Hello dear forum members, For a time being I had been working with the following model (Stata command format): - xtpoisson y x1 x2 x3 x4 x5, fe-...

    Started by kiton‎, 03-10-2016 02:03 PM
    negative binomial, poisson, random-effects, time-invariant
    • Replies: 3
    • Views: 1,333
    03-10-2016, 05:02 PM Go to last post
  37. Question Dummy variable in a Fixed effects (FE) model

    Hello :-) I am doing a paper where I examine the Scandinavian welfare model effect on inequality in the Scandinavian countries. I examine it using...

    Started by JoLinda91‎, 03-03-2016 05:54 AM
    • Replies: 4
    • Views: 1,178
    03-10-2016, 02:35 PM Go to last post
  38. chemical analysis

    Hi guys help me? I have a problem. I have to analyze a product just finished the processing (hot) and subsequently when it is cooled to room...

    Started by crimelist‎, 03-10-2016 02:44 AM
    • Replies: 13
    • Views: 1,551
    03-10-2016, 11:56 AM Go to last post
  39. regression of car accidents vs age (question about normality and implement gender)

    a few basic questions. I'm just starting to learn regression so I'm trying to apply what I'm learning. I have a set of data with ages ranging...

    Started by semidevil‎, 03-03-2016 09:38 PM
    • Replies: 14
    • Views: 1,875
    03-09-2016, 05:11 PM Go to last post
  40. Question about linear regression & residuals

    I have been reading up on linear regression and residual plots here on stattrek: http://stattrek.com/regression/residual-analysis.aspx?Tutorial=AP...

    Started by pablowilks‎, 03-08-2016 03:24 PM
    • Replies: 2
    • Views: 1,052
    03-09-2016, 07:46 AM Go to last post
  41. Categorical variables changing by their groupmean

    Hi For a project I need to model industrial data. Large part of the dataset consists out of nominal categorical variables (430 variables in total...

    Started by studentbelg‎, 03-08-2016 05:20 PM
    • Replies: 0
    • Views: 719
    03-08-2016, 05:20 PM Go to last post
  42. When to specify an interaction effect

    I have a model with about 20 variables in it (6 of them are dummies from a categorical variable with 7 levels). All of these are suggested by the...

    Started by noetsi‎, 03-08-2016 09:26 AM
    • Replies: 4
    • Views: 994
    03-08-2016, 01:18 PM Go to last post
  43. Assignment

    Please may you help me answer the question, I'm stuck. Thanx!! A property analyst is examining the relationship between the City council’s...

    Started by natra‎, 02-22-2016 06:43 AM
    • Replies: 2
    • Views: 1,505
    03-08-2016, 04:22 AM Go to last post
  44. Using median case load as a predictor

    I am testing the impact of a contractor or a public unit working with a customer . A big part of this is generating control variables so I can...

    Started by noetsi‎, 03-07-2016 05:56 PM
    • Replies: 1
    • Views: 820
    03-07-2016, 07:49 PM Go to last post
  45. Prediction Intervals

    I am in the process of calculating the prediction intervals on a time series data linear regression model The independent variable in my model is...

    Started by Mukund‎, 03-07-2016 04:58 AM
    prediction interval, regression
    • Replies: 0
    • Views: 532
    03-07-2016, 04:58 AM Go to last post
  46. Good Tool to generate probability of a sale for 300,000 products

    Hi - I am trying to determine a good tool that will help me generate a probability of a sale for a list of of 300,000 products. I have a table of...

    Started by BlendRed3‎, 03-06-2016 01:37 PM
    • Replies: 0
    • Views: 596
    03-06-2016, 01:37 PM Go to last post
  47. Nonparametric regression using kernel weights

    Hi! I am wondering how I can present the results of nonparametric regression. I performed the nonparametric tests using R, and R package 'np'. ...

    Started by nieve5552‎, 03-05-2016 09:57 PM
    nonparametric, reporting results, reporting statistics, results
    • Replies: 0
    • Views: 900
    03-05-2016, 09:57 PM Go to last post
  48. Which SSR (Regression sum of squares) is theoretically larger?

    Dear all, I have 3 fitted lines: Y = b0 + (b1)X Y = (0.5)b0 + (b1)X Y = b0 + 0.5(b1)X Where and In addition to the the 3 equations...

    Started by UniApply‎, 03-03-2016 12:10 PM
    • Replies: 2
    • Views: 671
    03-03-2016, 12:57 PM Go to last post
  49. MANOVA or Multivariate Regression? please help clarify

    Hi, Really hope someone can confirm. I think I need to use Multivariate regression for this; - one group of N judges score N performances and...

    Started by GiantCorn‎, 03-02-2016 08:58 AM
    • Replies: 0
    • Views: 531
    03-02-2016, 08:58 AM Go to last post
  50. Two variable OLS Regression - using normal equations

    Hi, I am experiencing difficulties in understanding the following question; I have been assigned two variables (X and Y), and have been...

    Started by UniApply‎, 03-01-2016 01:32 PM
    linear regression, normal equations, ols regression, regression analysis, two variables
    • Replies: 0
    • Views: 1,013
    03-01-2016, 01:32 PM Go to last post
  51. Split file regression, or Fixed effects Mixed model

    Within a dataset that has a few variables explaining dependent variable A, and influences vary over different categories, it can be obvious to split...

    Started by joostvanvlimmeren‎, 03-01-2016 06:21 AM
    fixed effect, fixed effect model, mixed effect, regression, split file
    • Replies: 2
    • Views: 738
    03-01-2016, 07:40 AM Go to last post
  52. Cool Linear regression on data with standard deviations?

    (crossposting from here) I am trying to do many linear regressions on series of data points where each data point is associated with a standard...

    Started by Sosi‎, 02-29-2016 12:00 PM
    linear regression
    • Replies: 0
    • Views: 690
    02-29-2016, 12:00 PM Go to last post
  53. Regression Analysis for Paired Data SAS

    Hi Everybody, I want to analyze paired data using regression analysis to adjust for covariates. I used PROC MIXED statement in SAS and I modeled...

    Started by Mai Mehanna‎, 02-27-2016 08:34 PM
    • Replies: 6
    • Views: 1,452
    02-29-2016, 08:52 AM Go to last post
  54. Multivariate regression with paired samples?

    Hello, First time poster here. I have data from two groups of people recorded during two different conditions. I would like to study how the...

    Started by mnd‎, 04-02-2013 12:44 PM
    • Replies: 10
    • Views: 9,689
    02-27-2016, 11:51 PM Go to last post
  55. Association between categorical and numerical variables using R

    Hi, I am new to this forum so please be kind :-). Not sure if this belongs in 'R'. I will describe my problem as good as I can. First of all I am...

    Started by MasterStudent‎, 02-25-2016 07:43 AM
    chi square, general linear model, r commander
    • Replies: 5
    • Views: 2,054
    02-25-2016, 12:06 PM Go to last post
  56. Talking Ordinal logistic regression or linear regression?

    Hi Guys, just wondering if I could have your help pls. I have a sample size of 55 patients (of which 22 were subsequently diagnosed with Heart...

    Started by skaur‎, 02-25-2016 05:14 AM
    • Replies: 0
    • Views: 1,015
    02-25-2016, 05:14 AM Go to last post
  57. What is the difference between an interaction effect and a moderator in regression?

    I hear these two concepts a lot in the literature. I have no idea what the difference is between a moderator and an interaction term. While I am...

    Started by noetsi‎, 01-28-2016 01:56 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 2,918
    02-24-2016, 03:02 PM Go to last post
  58. Panel Data Regression Models!

    Hello mates! I am doing thesis (research) as part of my degree completion requirement. My topic is a general one “Capital Structure and Corporate...

    Started by Jibran‎, 02-01-2016 01:58 PM
    • Replies: 1
    • Views: 990
    02-24-2016, 08:49 AM Go to last post
  59. Pearson correlation coefficient and Standard dev

    I know the basic interpretation of r. I.e., -1(<or =)r(<or=1). Critical values for n etc. However, while helping a research nursing student, her...

    Started by Joolz‎, 02-23-2016 09:02 AM
    • Replies: 0
    • Views: 504
    02-23-2016, 09:02 AM Go to last post
  60. Is this really independent

    I read an article today that made me wonder. They used linear regression to predict income at closure. One of their predictor variables was income...

    Started by noetsi‎, 02-22-2016 06:00 PM
    • Replies: 3
    • Views: 879
    02-22-2016, 09:33 PM Go to last post

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