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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Smile Very Small Sample Size -What multivariate analysis should be used

    Dear all, Good day! I'm having a hard time researching for possible multivariate analysis to be used in my study. I have less than 10 sample...

    Started by Gibi‎, 09-18-2012 05:39 AM
    regression analysis, small sample size
    • Replies: 6
    • Views: 9,343
    02-20-2017, 01:34 PM Go to last post
  2. Repeated measures question

    Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

    Started by LEMONIAS‎, 11-20-2016 06:56 PM
    • Replies: 6
    • Views: 3,268
    05-31-2017, 04:14 AM Go to last post
  3. Understanding pairwise correlation

    Maybe it is the current time, but I have some difficulties understanding what my tutor means (and he is gone on vacation so I can't ask). In my...

    Started by Jazz3‎, 05-03-2017 09:56 AM
    • Replies: 6
    • Views: 1,224
    05-03-2017, 02:44 PM Go to last post
  4. Exclamation Research Proposal - Statistical Analysis?

    I am submitting a research proposal, "Does the relationship of exercise and quality of sleep differ with age?" where age is the moderator. It has...

    Started by mackk2‎, 04-25-2017 08:00 AM
    • Replies: 6
    • Views: 1,084
    04-25-2017, 11:41 AM Go to last post
  5. Is it best to match data units to get a logical regressional relationship?

    Hi, I'm trying to find an economic relationship between inflation(CPI) and leakages to the economy like Taxes, Savings, and Imports. Well, it...

    Started by Zenny‎, 04-10-2017 09:22 PM
    inflation
    • Replies: 6
    • Views: 710
    04-11-2017, 02:20 PM Go to last post
  6. Process Model and Covariates

    Hi all, I am having difficulty with Andrew Hayes' Process tool and my mediation model. Is it acceptable to run a mediation analysis with a...

    Started by Aegislash‎, 03-02-2017 08:48 AM
    andrew hayes, covariates, process model
    • Replies: 6
    • Views: 2,148
    03-05-2017, 02:59 PM Go to last post
  7. Linear regression / trend question - basic question

    Sorry for basic question: I have a series of measurements taken at weekly intervals for a period of 20 weeks. Each measurement is a proportion:...

    Started by tonytheviking‎, 05-16-2017 03:20 AM
    • Replies: 6
    • Views: 1,065
    05-19-2017, 09:07 AM Go to last post
  8. Logistic Regression - predicted probabilities opposite to actual percentages

    Hi! I've asked this question elsewhere but haven't yet got a response that makes much sense to me... I have conducted a logistic regression in...

    Started by DrJay‎, 07-13-2017 08:52 AM
    • Replies: 6
    • Views: 477
    07-17-2017, 03:40 AM Go to last post
  9. Interaction / Moderation effect linear regression

    Hi, I have a question regarding a moderation effect with linear regression. I have hypothesized for a significant main effect and another...

    Started by diederikvanduuren‎, 08-01-2017 03:34 PM
    • Replies: 6
    • Views: 569
    08-12-2017, 11:34 AM Go to last post
  10. Fixed vs. Random Effects

    I'm wondering if someone could help me to correctly identify whether certain variables should be considered fixed or random effects. Just as...

    Started by Weibull‎, 08-28-2017 09:38 AM
    difference, effects, fixed, random
    • Replies: 6
    • Views: 383
    08-29-2017, 04:43 AM Go to last post
  11. Collinearity help

    I saw a suggestion on a web page for dealing with collinearity I had not seen before. http://www2.chass.ncsu.edu/garson/pa765/tacq.htm "Treat...

    Started by mishery‎, 10-25-2005 11:56 AM
    • Replies: 5
    • Views: 5,907
    06-28-2011, 07:51 AM Go to last post
  12. Multiple Regression Question

    Hello, I have a question about multiple regression. My project involves non-political group involvement predicting political participation. My...

    Started by nadia‎, 02-20-2006 07:17 PM
    • Replies: 5
    • Views: 4,121
    02-21-2006, 08:37 PM Go to last post
  13. Question Linear Regression Equation

    Dear friends, I have a set of data as follows: 1....... 58.823.23 10....... 62.57.90 50....... 87.232.33 100....... 110.2910.33...

    Started by pavnesh‎, 07-27-2006 05:43 AM
    • Replies: 5
    • Views: 4,014
    08-11-2006, 12:24 AM Go to last post
  14. Interactions in regression analysis

    Is their anyone who knows how to identify interactions between independent variables in a regression analysis? How does one use the output...

    Started by firefly‎, 06-08-2007 08:30 AM
    • Replies: 5
    • Views: 5,027
    06-09-2007, 09:42 PM Go to last post
  15. Multiple logistic regression models

    Hi Am I correct in saying that if my results from multiple logistic regression show that the full model does not differ significantly from the...

    Started by WTwine‎, 01-23-2008 07:58 AM
    • Replies: 5
    • Views: 3,755
    02-20-2008, 09:00 AM Go to last post
  16. Urgent: Linear Regression - Survey Design - Help needed

    Hi everyone, For my master thesis, I am trying to prepare a survey on key success factors for virtual worlds. I want to do a linear regression...

    Started by Lisaly2345‎, 04-10-2008 10:28 AM
    • Replies: 5
    • Views: 3,666
    04-16-2008, 03:28 AM Go to last post
  17. Did I do this correctly?

    Hi, I am trying to forecast electric power demand for natural gas in the near future. A huge driver of electric power demand for natural gas on a...

    Started by naturallight‎, 06-12-2009 06:08 PM
    • Replies: 5
    • Views: 3,034
    06-15-2009, 07:01 PM Go to last post
  18. Multiple linear regression: partial F-test

    "Suppose that in a MULTIPLE linear regression analysis, it is of interest to compare a model with 3 independent variables to a model with the same...

    Started by kingwinner‎, 06-18-2009 08:58 PM
    • Replies: 5
    • Views: 20,669
    06-20-2009, 11:32 AM Go to last post
  19. variance for multiple regression model

    studying for a test.. any help appreciated.. Consider the multiple regression model Y = Xβ + ϵ, where X is n x (k+1) matrix, β is a vector of...

    Started by hanelliot‎, 06-21-2009 12:00 PM
    • Replies: 5
    • Views: 7,811
    06-22-2012, 03:47 AM Go to last post
  20. Web Analyst: Been a While Since I Touched Stats

    Hey everyone, I joined up to this site looking to get some advice. I have been doing web analytics for just over 2 years now. I have an...

    Started by JTWood‎, 07-06-2009 11:03 PM
    • Replies: 5
    • Views: 2,714
    07-08-2009, 08:23 PM Go to last post
  21. Problem with small amount of cases

    Hi New here, and fairly new with statistics. I have a problem with too few cases, but more than enough variables and observations. I have no...

    Started by Cai‎, 08-16-2009 11:47 AM
    • Replies: 5
    • Views: 2,465
    08-19-2009, 12:09 PM Go to last post
  22. Cool Linear regression assumptions not met, now what?!

    Hi, I tried and tried but I could not meet the assumptions for linear regression (normal, linearity, independence, etc.). I have multiple...

    Started by Toulouse‎, 12-17-2009 07:32 PM
    • Replies: 5
    • Views: 13,755
    12-19-2009, 01:54 PM Go to last post
  23. R^2 for linear multiple linear regression

    I have two candidates for a linear regression model on y, say x_1, and x_2. So I get two linear regression model for each (b_i*x_i+a_i+e_i) each...

    Started by raver_68‎, 05-11-2010 05:00 PM
    • Replies: 5
    • Views: 7,563
    05-12-2010, 04:25 PM Go to last post
  24. Unhappy assumption of independence

    Why is it important that cases are independent in regression (especially, logistic regression)? By "independent" i mean that observations under...

    Started by reductico‎, 06-09-2010 09:35 AM
    • Replies: 5
    • Views: 16,716
    06-09-2010, 02:04 PM Go to last post
  25. Categorical regression question

    Hi, everyone Hope the experts here can help me out with a question. I have a database with several respondents providing data on...

    Started by kladan‎, 07-13-2010 12:24 PM
    • Replies: 5
    • Views: 4,023
    07-13-2010, 02:47 PM Go to last post
  26. advanced method to compare regression coefficient

    Hello, I am regressing two butterfly richness variables (summer and winter) against a set of environmental variables separately. ...

    Started by helenekuo‎, 08-06-2010 05:52 PM
    • Replies: 5
    • Views: 4,403
    08-07-2010, 05:35 AM Go to last post
  27. Var(Y_knot_Hat)

    Hello all, I need a little help with this: Show Var(Y_knot_Hat) = Sigma^2 * (1/n + (x_knot - x_bar)^2 / Sxx) Start with Y_knot_hat = b_knot...

    Started by floriandotti‎, 09-30-2010 01:07 AM
    • Replies: 5
    • Views: 4,092
    09-30-2010, 01:07 PM Go to last post
  28. Regression of probability distributions

    I have an dataset where the y values are multiple points representing a probability distribution rather than a single discrete point. I'm trying to...

    Started by JeffTheGreen‎, 10-06-2010 05:32 PM
    • Replies: 5
    • Views: 3,269
    10-12-2010, 04:45 AM Go to last post
  29. Linear Mixed Effects Regression

    Hello, Please can anyone help me with the above topic. I'm using SAS and am unsure on how to program this. I think that a PROC MIXED is to be...

    Started by sasa81‎, 10-16-2010 04:40 PM
    • Replies: 5
    • Views: 7,039
    12-10-2010, 07:14 AM Go to last post
  30. Regression in excel - Is this possible?

    Hi guys. Okay for my regression project, I have all my data and my Y value is based on 7 variables (i.e. Y = b0 +b1x1 +...+ b7x7) Now i have...

    Started by c2q‎, 11-22-2010 08:14 PM
    • Replies: 5
    • Views: 4,362
    12-11-2010, 01:59 PM Go to last post
  31. Insignificant regression explanation-HELP!!!

    Hi, As part of my dissertation I am doing a regression analysis in which I am examining if gender, age, Internet use, education and occupational...

    Started by alexandros__23‎, 01-15-2011 07:39 PM
    • Replies: 5
    • Views: 25,318
    01-16-2011, 01:24 PM Go to last post
  32. simple logistic regression question

    I'm doing a willingness to pay survey to see if people are willing to spend $1 for clean water. I randomly sampled 100 people and one of the...

    Started by alphaqn69‎, 02-12-2011 05:10 PM
    • Replies: 5
    • Views: 5,054
    02-28-2011, 12:36 AM Go to last post
  33. Help needed with counter intuitive result in OLS

    Hi All, I have a simple linear regression run between say, statements about the impression with a brand on its favorability What i am getting...

    Started by satish.kumar1986‎, 02-20-2011 02:03 PM
    • Replies: 5
    • Views: 3,966
    02-21-2011, 04:48 AM Go to last post
  34. I need help

    I need help I have this homework that I cant solve it Show that s^2=(1|n-2)∑(y-y^) is unbiased estimator for sigma^2 in linear regression model...

    Started by redflower‎, 03-09-2011 06:26 PM
    sigma^2, unbiased estimator
    • Replies: 5
    • Views: 2,218
    03-12-2011, 12:13 PM Go to last post
  35. Phonetics: Interactions without one of the main effects

    I am using a logistic regression model with bias reduction in order to predict the contrast between /b/ and /p/ in Ojibwe based on acoustic...

    Started by Adam J.R. Tallman‎, 04-22-2011 09:11 PM
    aic discriminant, interaction effect
    • Replies: 5
    • Views: 3,636
    04-23-2011, 03:32 PM Go to last post
  36. Help with choosing a model and identifying problems

    Hello, I have a complicated problem, I actually didn't start working on the data yet, still in the phase of planning. I need some help in getting...

    Started by NN_STAT‎, 05-12-2011 01:57 AM
    • Replies: 5
    • Views: 2,342
    05-20-2011, 09:52 AM Go to last post
  37. Moderated multiple regression and mixed factorial ANOVA

    I conducted a moderated multiple regression and a mixed factorial ANOVA on the same variables and got two different results (using moderated multiple...

    Started by acue‎, 06-06-2011 10:48 PM
    • Replies: 5
    • Views: 7,475
    08-27-2011, 03:52 PM Go to last post
  38. Simple regression question

    Hi. I know most of my basic regression stuff but I forgot one thing. I conducted a regression with 4 independent variables and from my regression...

    Started by c2q‎, 06-12-2011 02:57 PM
    • Replies: 5
    • Views: 2,604
    06-15-2011, 08:06 AM Go to last post
  39. Logistic Regression

    Hi Everyone, I'm new here and this is my second post. I am doing research with patients and their believes about medicine. I have one spreadsheet...

    Started by fred_1‎, 07-06-2011 07:51 AM
    • Replies: 5
    • Views: 2,349
    08-13-2011, 09:17 AM Go to last post
  40. Ncaaf multiple regression

    I want to do a mutiple regression analysis, with one of my independent variables being the number of seniors, juniors, ... On a football team. I...

    Started by Kimberly‎, 08-09-2011 05:43 PM
    • Replies: 5
    • Views: 2,895
    08-10-2011, 12:19 PM Go to last post
  41. Relative contribution of variables in logistic regression

    Hi, I have been using logistic regression to determine what influences the chances of a person becoming unemployed. A number of variables have all...

    Started by lmsava‎, 08-22-2011 04:11 PM
    • Replies: 5
    • Views: 20,419
    08-23-2011, 05:18 AM Go to last post
  42. Need help on a regression problem

    Hi guys, I got a degree in statistics but I'm pretty rusty since I haven't touched it for over 5 years. Hope someone can help. :) Basically I have...

    Started by Tian‎, 09-16-2011 09:32 AM
    • Replies: 5
    • Views: 1,945
    09-16-2011, 01:21 PM Go to last post
  43. Data Question

    Ok I am trying to look at the relationship of sales

    Started by student865‎, 11-10-2011 01:51 PM
    • Replies: 5
    • Views: 1,964
    11-10-2011, 04:02 PM Go to last post
  44. Post hoc in ANCOVA

    I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

    Started by Oritteropus‎, 01-18-2012 05:39 AM
    • Replies: 5
    • Views: 8,095
    01-20-2012, 07:59 AM Go to last post
  45. Logistic regression problem

    Hi, I'm experiencing difficulties with understanding my results despite active googling, and i'd be really grateful, if someone could help me. ...

    Started by kati‎, 01-18-2012 08:13 PM
    • Replies: 5
    • Views: 4,060
    01-18-2012, 11:01 PM Go to last post
  46. Question about Regression and relationship testing

    Hello, I am working on a project that is trying to look a possible correlation between BMI and various outcomes in a patient group. So the BMI...

    Started by artaxerxes‎, 02-03-2012 10:24 AM
    • Replies: 5
    • Views: 2,429
    02-03-2012, 01:04 PM Go to last post
  47. Lowest Mean Squared Error doesn't mean highest R^2?

    Question: Well, the title says it already. Does the lowest Mean Squared Error not automatically mean the highest R^2? Reason for asking: I'm doing...

    Started by Jolien‎, 02-06-2012 09:52 PM
    • Replies: 5
    • Views: 3,035
    02-09-2012, 12:15 AM Go to last post
  48. Why does efficiency matter

    In a discussion of my old favorite non-normal data, Fox notes that while CI and test of signficance are commonly not effected much by nonnormality in...

    Started by noetsi‎, 02-16-2012 02:01 PM
    • Replies: 5
    • Views: 1,746
    02-17-2012, 11:49 AM Go to last post
  49. Articles/information on robust regression?

    Hi, I am a little confused as to what methods there are for "robust" regression. I thought it was an actual type (as in logistic, linear, etc),...

    Started by statn00b‎, 02-23-2012 09:05 AM
    • Replies: 5
    • Views: 2,401
    02-26-2012, 07:32 PM Go to last post
  50. Urgent Help required: How to calculate linear predictor x in this table?

    Dear All, Please help

    Started by graced‎, 03-03-2012 07:56 AM
    • Replies: 5
    • Views: 1,927
    03-04-2012, 12:32 AM Go to last post
  51. Categorical variables - Logistic regression

    Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

    Started by nikhil_s‎, 03-07-2012 10:38 AM
    binning, categorical data analysis, categorical vairable, logistic regression
    • Replies: 5
    • Views: 3,881
    03-07-2012, 02:06 PM Go to last post
  52. non-linear regression time response model

    Hi I need to choose a non linear regression model for, protein phosphorylation over time response, for this kind of data Is not like enzyme...

    Started by friveroll‎, 05-17-2012 04:22 PM
    non-linear, regresion analysis
    • Replies: 5
    • Views: 3,393
    05-19-2012, 09:05 AM Go to last post
  53. Find the regression equation

    Hi I have problem and I want you to help me This problem should use by Minitab.... In a study in collaboration with the Engineering...

    Started by evian‎, 05-28-2012 01:52 AM
    • Replies: 5
    • Views: 2,669
    05-28-2012, 08:06 AM Go to last post
  54. Beta regression 1 and 0 values

    Hi there, I am trying to carry out beta regression but some of the realitzationsof my response varaible are 0 and 1 values and hennce I cannot...

    Started by Tomas_M‎, 05-28-2012 04:17 AM
    • Replies: 5
    • Views: 3,450
    05-28-2012, 08:47 AM Go to last post
  55. Question Logistic Regression: Include constant in the model or not?

    Hi! 1. Could anybody give me a detailed explanation about why is inappropriate not to use a constant in a logistic regression model? Could you...

    Started by neuroscientist‎, 06-11-2012 09:22 PM
    • Replies: 5
    • Views: 13,158
    06-12-2012, 06:08 AM Go to last post
  56. Hierarchical Regression

    Hi, I need to perform hierarchical regression and include in the models independent variables (some interval and some dummy variables), moderator...

    Started by milehigh899‎, 06-16-2012 08:58 PM
    • Replies: 5
    • Views: 2,332
    06-16-2012, 10:27 PM Go to last post
  57. Combining the effect of the linear and the Quadratic terms in Regression

    Hi all, I am running a poisson regression model where I have linear term and quadratic term of time as predictors. When both are significant, can...

    Started by Avatar‎, 06-20-2012 07:39 PM
    • Replies: 5
    • Views: 2,664
    06-21-2012, 11:17 AM Go to last post
  58. Transformation of variables

    Hello, I have a regression problem I do not know how to approach. I have a regression line: y=4+5x a linear transformation is being done: ...

    Started by Yankel‎, 07-11-2012 03:36 PM
    • Replies: 5
    • Views: 1,605
    07-14-2012, 03:17 PM Go to last post
  59. [Violation] Hosmer & Lemeshow - Binary Logistics Regression

    I want to analyze some factors which contribute to smoking behavior in teenager and young adult. These are my variables: y = smoking status...

    Started by sg2kilo‎, 07-16-2012 09:14 AM
    hosmer and lemeshow
    • Replies: 5
    • Views: 2,616
    07-17-2012, 07:05 PM Go to last post
  60. CARs from small sample(26): Which Regression is the best to perform?

    Dear All, I am new to this forum, but I am trying to become more and more specified in statistics for my Master Thesis (Erasmus University...

    Started by Bart Lips‎, 07-17-2012 08:12 AM
    event study, regression analysis, small sample size
    • Replies: 5
    • Views: 3,423
    07-23-2012, 02:13 PM Go to last post

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