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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Least square estimates

    (y1, x1)...(yn, xn) and (w1,x1),.....(wn,xn) are independent oberservations where x1...xn are fixed constants. Suppose we fit the first model yi = a1...

    Started by Cookie‎, 08-22-2011 02:51 AM
    • Replies: 3
    • Views: 5,182
    08-22-2011, 11:49 PM Go to last post
  2. 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: 20,165
    08-23-2011, 05:18 AM Go to last post
  3. Unhappy Regression Help for Masters thesis


    Started by Parikshit Luktuke‎, 08-23-2011 09:49 PM
    • Replies: 4
    • Views: 6,148
    08-24-2011, 12:55 AM Go to last post
  4. Poisson regression and effects of predictors

    Dear all, I just registered this forum too, since I am in doubt what to do! In a study, I want to determine the effects of grazing by animals...

    Started by jaofik‎, 08-23-2011 02:58 PM
    • Replies: 4
    • Views: 5,477
    08-24-2011, 06:50 AM Go to last post
  5. year fixed effects in time series regression

    I'm trying to estimate what effect the tariff rate in a specific country has on evasion of tariffs (or rather the underreporting of the value of...

    Started by oscarscheja‎, 08-26-2011 03:23 AM
    dummy variables, fixed effects, time series
    • Replies: 0
    • Views: 3,776
    08-26-2011, 03:23 AM Go to last post
  6. Multiple Moderated Regression Help!

    Hi folks, i need help regarding multiple moderated regresison analysis in SPSS. I have one independent variable (X), one Dependent variable (Y)...

    Started by nouman‎, 08-26-2011 02:41 PM
    moderated multiple regres
    • Replies: 3
    • Views: 3,438
    08-27-2011, 09:42 AM Go to last post
  7. (easy) Maximum Likelihood Regression question...

    hello everyone. i am trying to get my head around a very easy example that i read somewhere explaining maximum likelihood estimation on the OLS...

    Started by will22‎, 08-27-2011 11:40 AM
    • Replies: 11
    • Views: 4,768
    08-27-2011, 02:33 PM Go to last post
  8. 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: 7,407
    08-27-2011, 03:52 PM Go to last post
  9. How does correlation work?

    Dear All, I am a beginner to statistics. I have a pretty basic question. If I have 2 variables X and Y, how does E produce a no which measures...

    Started by john2011‎, 08-28-2011 09:55 PM
    • Replies: 2
    • Views: 4,333
    08-28-2011, 11:03 PM Go to last post
  10. homework problem

    I have to find a linear model that explains the variable "days to death" based on the other variables. I can't upload the data. If you want to help...

    Started by Pat07‎, 08-29-2011 05:48 AM
    • Replies: 0
    • Views: 1,541
    08-29-2011, 05:48 AM Go to last post
  11. Trend data with categorical independent variables

    I have 4 time points (future timepoints will be added shortly) measured for each company (about n=150). Each company is associated with one of 20...

    Started by shanehall.m‎, 08-29-2011 10:37 AM
    categorical data, rates, time series
    • Replies: 0
    • Views: 2,087
    08-29-2011, 10:37 AM Go to last post
  12. 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: 3,536
    08-30-2011, 02:43 AM Go to last post
  13. Panel Data Regression using Stata/SPSS

    Please I need help. I am trying to run multiple regression analysis using SPSS and Stata but what am getting is not good at all. Can anybody help?...

    Started by Dele‎, 08-30-2011 05:56 AM
    • Replies: 0
    • Views: 4,640
    08-30-2011, 05:56 AM Go to last post
  14. Multiple regression analysis: Significant regression model, insignificant predictors

    With regards to the title above, my multiple regression model has a significant F value but none of the predictors are significant. All the...

    Started by Serene‎, 08-19-2011 12:16 AM
    • Replies: 6
    • Views: 12,826
    08-30-2011, 04:51 PM Go to last post
  15. multiple sets of data fitted to one distribution

    Hello everyone, I'm new to this board so I hope I'm putting this in the right section. I have multiple sets of data which fit the same...

    Started by paul00‎, 09-01-2011 01:15 AM
    • Replies: 1
    • Views: 2,448
    09-01-2011, 01:34 AM Go to last post
  16. Nonlinear regression of non normal asymetric data

    Hi! I have a set of data that is dependent on 3 dependent variables. The data is collected over a time period tvice a day. I have a theoretical...

    Started by Peter Olsson‎, 09-01-2011 12:50 PM
    • Replies: 1
    • Views: 2,575
    09-01-2011, 01:35 PM Go to last post
  17. 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: 4,875
    09-01-2011, 02:15 PM Go to last post
  18. 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: 2,478
    09-02-2011, 04:45 AM Go to last post
  19. 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: 3,655
    09-03-2011, 08:52 PM Go to last post
  20. 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: 2,851
    09-04-2011, 04:10 PM Go to last post
  21. 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: 2,968
    09-05-2011, 05:42 AM Go to last post
  22. 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: 6,115
    09-06-2011, 06:56 AM Go to last post
  23. 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
  24. 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
  25. 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: 3,865
    09-07-2011, 10:17 AM Go to last post
  26. 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
  27. 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
  28. 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: 1,486
    09-09-2011, 03:14 PM Go to last post
  29. 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: 4,794
    09-09-2011, 04:02 PM Go to last post
  30. 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: 2,512
    09-11-2011, 08:14 PM Go to last post
  31. 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: 5,268
    09-12-2011, 11:32 PM Go to last post
  32. 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
  33. 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: 2,095
    09-13-2011, 07:16 PM Go to last post
  34. 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: 3,282
    09-15-2011, 10:47 AM Go to last post
  35. 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: 6,312
    09-15-2011, 09:24 PM Go to last post
  36. 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: 3,430
    09-16-2011, 09:21 AM Go to last post
  37. 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: 1,924
    09-16-2011, 01:21 PM Go to last post
  38. 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: 2,520
    09-17-2011, 12:18 PM Go to last post
  39. 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: 7,935
    09-19-2011, 12:06 PM Go to last post
  40. 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: 3,323
    09-21-2011, 06:48 AM Go to last post
  41. 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
  42. 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: 2,357
    09-21-2011, 12:37 PM Go to last post
  43. 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: 12,596
    09-22-2011, 10:17 PM Go to last post
  44. 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: 2,341
    09-24-2011, 01:00 PM Go to last post
  45. 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: 2,631
    09-26-2011, 04:17 AM Go to last post
  46. 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
  47. 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: 1,606
    09-27-2011, 09:00 PM Go to last post
  48. 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: 2,459
    09-28-2011, 12:27 AM Go to last post
  49. 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
  50. 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: 3,243
    09-28-2011, 06:19 PM Go to last post
  51. 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: 12,158
    09-29-2011, 03:22 AM Go to last post
  52. 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: 1,801
    09-30-2011, 08:37 AM Go to last post
  53. 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: 8,622
    09-30-2011, 12:41 PM Go to last post
  54. 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: 12,415
    10-02-2011, 02:18 PM Go to last post
  55. 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: 6,550
    10-04-2011, 11:01 AM Go to last post
  56. 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
    • Replies: 2
    • Views: 2,227
    10-06-2011, 06:19 AM Go to last post
  57. 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
    • Replies: 4
    • Views: 2,967
    10-07-2011, 12:02 PM Go to last post
  58. 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: 3,722
    10-07-2011, 03:08 PM Go to last post
  59. 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
  60. 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

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