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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. logistic regression question

    Hi everyone, If you please advise me why in logitic regression if we have one dependent (binary) and 4 continuous variables, the r value is +ve...

    Started by Wael‎, 10-22-2011 02:08 PM
    • Replies: 2
    • Views: 2,765
    10-22-2011, 05:10 PM Go to last post
  2. Interpreting regression coefficients (transformed)

    Hello, I ran a GLM (poisson) analysis and have a list of my coefficients with their SEs. I need help interpreting the betas because the predictor...

    Started by Ochotona‎, 01-11-2010 10:16 PM
    • Replies: 14
    • Views: 21,954
    10-20-2011, 01:33 AM Go to last post
  3. Asymmetric confidence bands in nonlinear regression

    Hi, I would like to know the formula for asymmetric confidence bands in nonlinear regression. Figure 6 on this webpage is exactly what I'm looking...

    Started by craigsooman‎, 10-19-2011 02:43 PM
    • Replies: 0
    • Views: 2,522
    10-19-2011, 02:43 PM Go to last post
  4. Centered simple betas should be =?

    I'm reading Aiken and West Multiple Regression: Testing and Interpenetrating Interactions (p. 33-34) Assume CENTERED means: X_i-\bar{X}_i They...

    Started by trinker‎, 10-18-2011 06:50 PM
    • Replies: 2
    • Views: 2,264
    10-18-2011, 08:09 PM Go to last post
  5. Regression questions

    Hey everybody. I want to start out by saying Thank You for taking the time to look at my thread. I have completed my Stats course and now I am on to...

    Started by USMstudent85‎, 10-12-2011 11:13 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 6,738
    10-18-2011, 10:31 AM Go to last post
  6. Sum of Squares Model Proof

    I'm attempting the proof of the sum of squares model. I'm not exactly sure where to start but this is what I have to prove. sumYhati^2 = nYbar^2...

    Started by tk4210‎, 10-16-2011 01:26 AM
    • Replies: 1
    • Views: 5,144
    10-16-2011, 06:35 PM Go to last post
  7. How to run Multivariate regression model w/ lags in R

    Hello everyone, great resource here! I have done some googling and searching of forums, but I cant seem to find how to run a regression like the...

    Started by Raneff‎, 10-11-2011 07:17 PM
    • Replies: 1
    • Views: 3,032
    10-15-2011, 08:40 PM Go to last post
  8. Lightbulb Bootstrapping confidence intervals for prediction based on SE of the coefficients?

    Is it remotely legitimate to use the standard errors of the coefficients from linear regression in a Monte Carlo simulation to bootstrap 2.5%/97.5%...

    Started by bernoulli‎, 10-15-2011 08:35 PM
    bootstrap, confidence interval, regression
    • Replies: 0
    • Views: 1,556
    10-15-2011, 08:35 PM Go to last post
  9. Drawing polynomial out of regression results table of a fixed effects regression

    Dear all, maby its a simple question but I could not find a compelling answer in books or papers: I run a fixed effects regression giving me a...

    Started by balae‎, 10-14-2011 09:29 PM
    • Replies: 3
    • Views: 2,776
    10-15-2011, 04:06 PM Go to last post
  10. 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: 2,845
    10-14-2011, 01:37 PM Go to last post
  11. Correlation Coefficient

    Suppose X is transformed to cX, and Y is transformed to dY where c and d are constant, what happens to the correlation coefficient?? Is it...

    Started by hsian90‎, 10-14-2011 04:50 AM
    • Replies: 0
    • Views: 1,685
    10-14-2011, 04:50 AM Go to last post
  12. Smile Small question regarding linear mixed effect model

    Thanks so much for reading my post. I've listed key points below. Hopefully once completing reading my problem will become clear. X is an...

    Started by aaphill‎, 10-13-2011 10:49 PM
    • Replies: 0
    • Views: 1,826
    10-13-2011, 10:49 PM Go to last post
  13. Least Square Estimators

    When we only have sample size of 2,can we still calculate the least squares estimators for alpha and beta? ?

    Started by hsian90‎, 10-13-2011 12:23 PM
    • Replies: 3
    • Views: 1,894
    10-13-2011, 06:43 PM Go to last post
  14. Ways of showing for bivariate data

    Hello, What are the ways of showing that the bivariate date fits the simple regression model? One of the ways is showing the correlation between...

    Started by hsian90‎, 10-13-2011 12:15 PM
    • Replies: 2
    • Views: 2,775
    10-13-2011, 01:40 PM Go to last post
  15. GLM help with interactions

    I have a regression model I am trying to build using GLM. I have a continuous response variable, a main variable of interest that is dichotomous and...

    Started by pjtatman‎, 10-11-2011 03:49 PM
    • Replies: 1
    • Views: 2,534
    10-11-2011, 04:47 PM Go to last post
  16. P Values on the Intercept

    Hi, I have done a regressional analysis of a data set based on promotions to test the hypothesis that a specific qualification / specialisation...

    Started by wetdog‎, 09-28-2011 12:23 PM
    • Replies: 2
    • Views: 4,390
    10-11-2011, 01:38 PM Go to last post
  17. prediction using training data != training data

    (Full disclosure: This is a cross-post from the Kernel Machines Forum) I'm using LIBSVM for regression analysis and, despite double checking my...

    Started by fearless_fool‎, 10-07-2011 02:12 PM
    libsvm, prediction errors, regression
    • Replies: 2
    • Views: 2,641
    10-09-2011, 11:29 PM Go to last post
  18. Please help me, Rationale of algorithm for estimating conditional variance

    Hi could could someone please help me understand this regression logic to find a conditional variance in a polynomial least squares regression ? X...

    Started by Faysou‎, 10-07-2011 05:26 PM
    least-squares, variance estimation
    • Replies: 0
    • Views: 1,914
    10-07-2011, 05:26 PM Go to last post
  19. Regression analysis of Likert Scale

    Hi all, I'm new to this site and conducting research in Physical therapy. I'm attempting to analyze data from surveys with likert scale...

    Started by wakerivets‎, 10-07-2011 01:58 PM
    • Replies: 1
    • Views: 3,725
    10-07-2011, 03:08 PM Go to last post
  20. Stupid Q: Interpretation of slope in OLS

    Hi ppl I'm running a bunch of regressions on a series of stock returns (decimal values). One of the models is: r_t = a0 + b1*rm_t + e ...

    Started by Jonni‎, 10-05-2011 12:13 PM
    ols
    • Replies: 4
    • Views: 2,971
    10-07-2011, 12:02 PM Go to last post
  21. Moderation - help!

    ** Oops I meant to post this is the 'Psychology Statistics' forum. I've posted there, but cannot figure out how to delete this thread. Apologies for...

    Started by Tilly01‎, 10-03-2011 07:11 PM
    moderation
    • Replies: 2
    • Views: 2,231
    10-06-2011, 06:19 AM Go to last post
  22. Need Urgent help in Kruskal's relative importance

    Hi, My client wanted us to perform Kruskal's relative importance technique on some of their modeling work. We have reviewed lot of literature and...

    Started by zabbs‎, 05-27-2011 01:24 PM
    • Replies: 2
    • Views: 6,559
    10-04-2011, 11:01 AM Go to last post
  23. The Connection between conditional expectation and unconditional expectation

    William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

    Started by alexyflemming‎, 09-28-2011 06:51 AM
    • Replies: 3
    • Views: 12,417
    10-02-2011, 02:18 PM Go to last post
  24. why is the covariance of my residuals not 0?

    hello there. i am trying to wrap my head around the assumption that, in regular OLS regression, the covariance of the residuals is 0. i worked out a...

    Started by will22‎, 09-29-2011 09:45 PM
    • Replies: 11
    • Views: 8,623
    09-30-2011, 12:41 PM Go to last post
  25. Binomial GLMM, no variance in some groups

    Hey! I have a dataset, but I'm having big problems with it. For my research, I basically do some learning trials, and afterwards test for...

    Started by Waervyn‎, 09-30-2011 08:37 AM
    • Replies: 0
    • Views: 1,803
    09-30-2011, 08:37 AM Go to last post
  26. Sum of squares proof

    Hallo Im tring to prove that correct sum of cross products Sxy = Sum of (Xi)(Yi) - n XiYi given that Sxy = Sum of (Xi - Xbar)(Yi - Ybar). Can you...

    Started by RogerF‎, 09-28-2011 02:20 PM
    • Replies: 4
    • Views: 12,161
    09-29-2011, 03:22 AM Go to last post
  27. logistic regression with quartiles

    hi all i have some data that i need to divide into quartiles. after i do this, i will have a predictor variable with 4 categories. i need to do...

    Started by nemo‎, 09-28-2011 06:19 PM
    • Replies: 0
    • Views: 3,244
    09-28-2011, 06:19 PM Go to last post
  28. Should the standard error (SE) of the best-fit coefficients be propagated?

    Hi all, This is how I understand it. Please correct me if I’m wrong: When fitting models to experimental data the statistical software produces...

    Started by luri-fax‎, 09-28-2011 07:06 AM
    asymptotic standard error, curve fitting, error propagation
    • Replies: 0
    • Views: 2,117
    09-28-2011, 07:06 AM Go to last post
  29. Different Time Intervals with Logistic Regression

    Is it possible to use different time intervals with logistic regression? Let's say I was trying to predict a binary dependent variable (0,1) based...

    Started by mike6‎, 09-27-2011 04:11 PM
    • Replies: 1
    • Views: 2,460
    09-28-2011, 12:27 AM Go to last post
  30. Autoregression w/ Point Process?

    I would like to generate something akin to an ARX model of a quasi-sinusoidal continuous time series, but my exogenous variable is a binary (0-or-1)...

    Started by flaming_zamboni‎, 09-27-2011 09:00 PM
    • Replies: 0
    • Views: 1,607
    09-27-2011, 09:00 PM Go to last post
  31. Assumptions that underlie a regresion model

    Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want...

    Started by katlego‎, 09-23-2011 08:45 PM
    residual plots, residuals
    • Replies: 4
    • Views: 3,121
    09-26-2011, 11:52 AM Go to last post
  32. Regression Line Help

    I have an problem and I have a ton of numbers but I am not sure how they go into the questions.... Hours: 0, 1,1,2,3,3,5,5,5,6,6,7,7,9,10 Score:...

    Started by Idontknowmath‎, 09-25-2011 10:47 PM
    • Replies: 1
    • Views: 2,634
    09-26-2011, 04:17 AM Go to last post
  33. Red face Probably a dumb question...

    I have been using R to code my analyses for my research projects, and unfortunately my statistics background is sparse and ancient; please pardon me....

    Started by amyamy‎, 09-18-2011 10:27 PM
    • Replies: 1
    • Views: 2,344
    09-24-2011, 01:00 PM Go to last post
  34. Multiple Linear Regression for Categorical and Continuous data Independent Variable

    Dear all, I need to analyze the relationship of DV and IV. I have Dependent variable in continuous data. And i have around 22 independent...

    Started by harishnan85_03‎, 09-22-2011 08:48 PM
    • Replies: 2
    • Views: 12,602
    09-22-2011, 10:17 PM Go to last post
  35. Simple guidance needed (regression & interaction terms) plz

    Hi guys - I've been searching around online for a while and even have a textbook but I'm still confused and require guidance from someone. Running...

    Started by kharmis‎, 09-20-2011 10:27 AM
    • Replies: 3
    • Views: 2,359
    09-21-2011, 12:37 PM Go to last post
  36. linear regression through the origin

    Hi, I have to find a linear model, I've tried a lot of models but all of them gave me R^2 adj= 0,4. The model without the intercept gave me R^2...

    Started by Pat07‎, 09-21-2011 07:16 AM
    • Replies: 0
    • Views: 1,669
    09-21-2011, 07:16 AM Go to last post
  37. My GRS statistic value is coming out to be weird.

    I am calculating GRS F-statistic on excel. Howeve rthe value is coming out to be either veyr big in trillions or too small. I guess the problem...

    Started by Shikha‎, 09-21-2011 06:48 AM
    • Replies: 0
    • Views: 3,324
    09-21-2011, 06:48 AM Go to last post
  38. 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: 7,939
    09-19-2011, 12:06 PM Go to last post
  39. significant nonlinear curve

    Hello, For linear regression we have R that help as to know if x and y are correleted, and p-value if my correlation is significant. How can I...

    Started by Tania‎, 09-17-2011 12:00 PM
    correlation coefficient, regression, significance of reg
    • Replies: 1
    • Views: 2,523
    09-17-2011, 12:18 PM Go to last post
  40. 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: 1,926
    09-16-2011, 01:21 PM Go to last post
  41. Novice needs help with Maximum Likelihood Estimation of Logit Model

    Hi all, Id be grateful for some help. I realise this is perhaps elementary stuff for many but as someone without a formal statistics background, I...

    Started by An Novice‎, 09-16-2011 06:25 AM
    • Replies: 3
    • Views: 3,431
    09-16-2011, 09:21 AM Go to last post
  42. Panel Data Regression (xtreg) STATA

    Hello everyone, I'm running a pooled tiem series regression with random effects. It runs fine and I'm having a problem interpreting results. I'm a...

    Started by berry16‎, 09-15-2011 09:24 PM
    • Replies: 0
    • Views: 6,317
    09-15-2011, 09:24 PM Go to last post
  43. Independence of irrelevant alternatives test

    Hi, I'm looking for to test to see if my logistic regression model violates the independence of irrelevant alternatives assumption. The most often...

    Started by lmsava‎, 09-15-2011 10:47 AM
    • Replies: 0
    • Views: 3,283
    09-15-2011, 10:47 AM Go to last post
  44. Software Application Regression

    Hello here is my problem: I would like to perform a regression analysis to examine parts of my company's software application. I would like to...

    Started by mike6‎, 09-13-2011 07:16 PM
    • Replies: 0
    • Views: 2,097
    09-13-2011, 07:16 PM Go to last post
  45. Group size analysis over time

    Hi, I was wondering if anyone could help me please. I am looking at how group size changes with the amount of food available in a group of...

    Started by Emma2415‎, 09-13-2011 08:21 AM
    • Replies: 0
    • Views: 1,955
    09-13-2011, 08:21 AM Go to last post
  46. Regarding negative correlation and negative variance estimation result

    In ANOVA, we sometimes talk about that variance estimation can get negative result when there is negative correlation. I do not understand what...

    Started by winecoding‎, 09-12-2011 10:24 AM
    anova, correlation, variance estimation
    • Replies: 8
    • Views: 5,270
    09-12-2011, 11:32 PM Go to last post
  47. Logistic Regression

    I am having difficulty performing logistic regression in SPSS due to missing data. Any suggestions for controlling for missing data in logistic...

    Started by ChrisT‎, 09-08-2011 06:51 PM
    • Replies: 3
    • Views: 2,516
    09-11-2011, 08:14 PM Go to last post
  48. IQ/achievement test correlation (rxy)

    Working on creating new regression tables for determining the presence of learning disabilities. In order to do this, I need to determine a...

    Started by schoolpsych‎, 09-09-2011 02:09 PM
    correlation coefficients, rxy, sld
    • Replies: 1
    • Views: 4,800
    09-09-2011, 04:02 PM Go to last post
  49. Multivariate regression with non-linear effect on dependent variable

    Hi all, I'm looking for an appropriate technique for a problem I'm trying to solve. I have a dependent variable that is count data - number of...

    Started by schwartzaw‎, 09-09-2011 02:49 PM
    • Replies: 1
    • Views: 1,488
    09-09-2011, 03:14 PM Go to last post
  50. Fit a non-recatngular parabola in R

    Hello, I'd like to fit the formula below to a non-rectangular parabola in R. C = (XI+A-√((ϕI+A )^2-4XϕIA))/2X-R I have several data points...

    Started by nofunsally‎, 09-08-2011 10:01 PM
    hyperbola, non-linear, non-rectangular, parabola
    • Replies: 0
    • Views: 4,289
    09-08-2011, 10:01 PM Go to last post
  51. Missing time points in Cox Regression

    Hi, I'm pretty new to the forum so please excuse if I bring up something old. I have searched for an answer but have not found anything about it. ...

    Started by Orjan Dahlstrom‎, 09-05-2011 04:04 AM
    • Replies: 2
    • Views: 2,499
    09-07-2011, 03:55 PM Go to last post
  52. Logistic Regression and Multiple Regression

    Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

    Started by Andrewdevilliers‎, 09-06-2011 09:36 AM
    categories, logistic regression, logit, multiple regression, multiple variables
    • Replies: 13
    • Views: 3,866
    09-07-2011, 10:17 AM Go to last post
  53. Is it a sensible practice to collapse categories of a predictor?

    I used logistic regression to run a model. An explanatory variable called 'region' has 3 levels (1, 2, 3). Level 3 is the reference group. The...

    Started by bncoxuk‎, 09-06-2011 07:24 PM
    • Replies: 2
    • Views: 3,337
    09-07-2011, 10:07 AM Go to last post
  54. looking for a way to check possible mediation in regression

    Hi all, My research includes child-parent talk, and I have four main variable types: 1-Child talk 2-Child perceptions 3-Parent talk 4-Parent...

    Started by gilisegall‎, 09-07-2011 02:26 AM
    • Replies: 0
    • Views: 1,703
    09-07-2011, 02:26 AM Go to last post
  55. Lmer Output/: variable re-levelling

    Morning/Evening all I'm having a bit of a time getting the LME4 package to list ALL of my IVs, rather than all-1. By way of example, here is my...

    Started by drewmac‎, 09-04-2011 04:18 PM
    binomial, lmer, logistic regression, r package
    • Replies: 7
    • Views: 6,117
    09-06-2011, 06:56 AM Go to last post
  56. Multinomial hierarchical logistic regression

    Hi everyone! I am wondering if anyone could help me to understand multinomial logistic regression. I am trying to do similar hierarchical...

    Started by katimhone‎, 09-05-2011 05:39 AM
    • Replies: 1
    • Views: 2,969
    09-05-2011, 05:42 AM Go to last post
  57. Forward selection

    As most of you probably know, forward selection is a method of model selection that involves introducing independent variables into your model one by...

    Started by Bittereinder‎, 09-04-2011 03:42 AM
    • Replies: 1
    • Views: 2,852
    09-04-2011, 04:10 PM Go to last post
  58. Covariance of residual

    I'm given the mutiple regression equation Y = XB + e I have to find the covariance between e_hat and Y First what I did was changed e_hat =...

    Started by Cookie‎, 09-03-2011 08:52 PM
    • Replies: 0
    • Views: 3,656
    09-03-2011, 08:52 PM Go to last post
  59. Changes in the level of Significance

    I use standard errors for significance. Basically there is no problem with the significance, the problem is how to interprete the results. The...

    Started by dou‎, 09-01-2011 03:42 AM
    • Replies: 2
    • Views: 2,480
    09-02-2011, 04:45 AM Go to last post
  60. Which statistical test should I use?

    I am struggling with my dissertation, as having collected my data, I am unsure of which test to use. I am investigating the differences in imagery...

    Started by Rhys2175‎, 04-13-2011 08:13 AM
    • Replies: 4
    • Views: 4,878
    09-01-2011, 02:15 PM Go to last post

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