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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Esimating detector response from Calculated and Measured values

    Hello all, I have a dataset of soil concentration of a mineral Measured and Calculated. Calculted values are concentration calculated in lab and...

    Started by swagathnavin‎, 09-14-2012 05:37 PM
    • Replies: 1
    • Views: 1,224
    09-16-2012, 12:57 AM Go to last post
  2. Derivation of Distribution of Sum of Matrices in Quadratic Form

    I'm having a bit of trouble starting this question. Is it right for me to assume that the sum of the Ai matrices (A1 + A2 + ... up to k) is an...

    Started by chrishello‎, 09-15-2012 02:30 AM
    • Replies: 3
    • Views: 1,638
    09-16-2012, 12:34 AM Go to last post
  3. Sample size multiple linear regression

    Hi, Would anybody know of a method or a respectable online calculator for calculating the sample size for a multiple linear regression (being...

    Started by bradyj2‎, 09-13-2012 04:27 AM
    • Replies: 1
    • Views: 1,688
    09-15-2012, 11:30 PM Go to last post
  4. Confidence Interval question

    Let me explain some background about my situation before I ask my question. I'm ultimately looking for some insight regarding how best to compute...

    Started by lancearmstrong1313‎, 09-11-2012 06:42 AM
    • Replies: 1
    • Views: 1,471
    09-15-2012, 11:26 PM Go to last post
  5. Quasipoisson rregression interpretation

    Hi, I am trying to do a quasipoisson regression to know if the frequency of drinking of my subject is related to temperature. The problem is that...

    Started by pchret‎, 09-15-2012 12:57 PM
    • Replies: 1
    • Views: 1,916
    09-15-2012, 06:12 PM Go to last post
  6. Next step in logistic model...any thoughts?

    Hello! I would really appreciate your input on this if you have a minute! Im looking at 3 different characteristics of 'prestige', and how these...

    Started by drove5‎, 09-15-2012 10:54 AM
    • Replies: 0
    • Views: 860
    09-15-2012, 10:54 AM Go to last post
  7. Help with nth Leverage

    Deduce that the nth leverage lies between zero and one Heres my working out. (But part of it is from lectures.) I dont understand why the...

    Started by chrishello‎, 09-13-2012 09:55 AM
    • Replies: 1
    • Views: 1,433
    09-15-2012, 02:20 AM Go to last post
  8. Logistic regression (with countries & years)

    Hi all, I am trying to use logistic regression on a sample of 20,000+ firms across 50+ countries over several years to researching why firms...

    Started by lucas111‎, 09-13-2012 08:38 PM
    • Replies: 0
    • Views: 982
    09-13-2012, 08:38 PM Go to last post
  9. Logistic regresssion and economic significance

    Hi guys, Currently I am doing a research about elimination of etfs. Now I have to run a logistic regression using stata. However, I read...

    Started by Statahulk‎, 09-13-2012 12:55 PM
    • Replies: 0
    • Views: 2,249
    09-13-2012, 12:55 PM Go to last post
  10. Multiple regression, predictors normally distributed?

    Hi, I have a basic question, in multiple regression do the predictors variables have to be normally distributed or is it just the residuals...

    Started by bradyj2‎, 09-13-2012 06:00 AM
    • Replies: 1
    • Views: 1,254
    09-13-2012, 08:49 AM Go to last post
  11. number of hours worked squared

    Hello, My dependent variable is logged annual income. One of my independent variables is experience squared (the number of hours worked per...

    Started by sombrerodraco‎, 09-12-2012 09:41 PM
    • Replies: 4
    • Views: 1,516
    09-13-2012, 01:08 AM Go to last post
  12. Logistic regression problems with zero variance data

    Hello, I am working with binary data. My research question was whether different types of learning experiences would impact whether or not a child...

    Started by panacea‎, 09-12-2012 06:58 PM
    binary data, logistic regression, psychology experiment, spss
    • Replies: 0
    • Views: 1,636
    09-12-2012, 06:58 PM Go to last post
  13. binary logistics for suicide ideation and attempt

    Hi, I am doing analysis for relatively large sample of high school students (4000) of predicting lifetime usage of psychoactive substances as...

    Started by aliriza.arenliu‎, 09-10-2012 07:48 AM
    • Replies: 6
    • Views: 1,872
    09-12-2012, 05:38 PM Go to last post
  14. Choosing a statistical analysis - is a GAM appropriate for this data?

    Hello, I am a master’s student and working on writing my prospectus. As such, my advisor is rather picky and I am trying to make sure I have at...

    Started by Fractallis‎, 09-12-2012 02:32 PM
    • Replies: 0
    • Views: 2,207
    09-12-2012, 02:32 PM Go to last post
  15. 4-way nested Anova?

    A student of mine carried out some research before we thought about how we were going to analyze it, and we're a bit lost. We are trying to...

    Started by kalistys‎, 09-12-2012 09:42 AM
    • Replies: 0
    • Views: 1,473
    09-12-2012, 09:42 AM Go to last post
  16. Exclamation Multivariate linear regression, using multiple DVs in GLM>Multivariate

    Hi there, first of all thank you kindly for having such a knowledgeable brains trust :) Basically I'm facing a conundrum when it comes to how to...

    Started by thematfactor‎, 09-11-2012 11:16 PM
    • Replies: 0
    • Views: 2,377
    09-11-2012, 11:16 PM Go to last post
  17. How affects Multicollinearity to likelihood function in logistic regression

    Hello, I'm trying to select the best covariates in a logistic regression model by a forward stepwise method based on conditional likelihood ratio...

    Started by Manuel‎, 09-11-2012 11:51 AM
    likelihhod function., logistic regression, multicollinearity
    • Replies: 0
    • Views: 1,376
    09-11-2012, 11:51 AM Go to last post
  18. To Classify Or Not -- Does it make sense to use income brackets?

    At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

    Started by bryangoodrich‎, 09-08-2012 03:59 PM
    • Replies: 13
    • Views: 3,243
    09-11-2012, 10:10 AM Go to last post
  19. Unhappy Autocorrelation in nonlinear models

    Good morning! I'm running a random effects logit (xtlogit with stata) and cannot find how to test for autocorrelation. Has anyone an idea? Things...

    Started by Andy‎, 09-11-2012 02:12 AM
    • Replies: 0
    • Views: 1,531
    09-11-2012, 02:12 AM Go to last post
  20. Degrees of freedom for a moving average?

    Can someone please help me to determine the correct number of degrees of freedom used when calculating a moving average? For example, with annual...

    Started by Joz‎, 09-11-2012 12:36 AM
    degrees of freedom, moving average
    • Replies: 0
    • Views: 5,652
    09-11-2012, 12:36 AM Go to last post
  21. 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: 1,745
    09-10-2012, 03:53 AM Go to last post
  22. Urgent Some Reasons why variables are insignificant

    Hi guys *its urgent plz* i just wanted to know some good reasons of "why my some of the variables are insignificant in regression, As...

    Started by lamhay101‎, 09-08-2012 03:33 PM
    • Replies: 6
    • Views: 3,116
    09-10-2012, 12:39 AM Go to last post
  23. Help with low Durbin Watson value

    I have a large table of time series data. I am trying to build a regression model and all assumptions are satisfied except independent errors. The DW...

    Started by micdhack‎, 09-09-2012 10:36 AM
    • Replies: 1
    • Views: 7,079
    09-09-2012, 03:52 PM Go to last post
  24. Suppressor variable in multiple regression

    Hi everyone! I am currently testing a model in organizational behavior where I have several behaviors (B1, B2, B3) that impact positively an...

    Started by newtonyc83‎, 09-09-2012 11:14 AM
    • Replies: 0
    • Views: 1,986
    09-09-2012, 11:14 AM Go to last post
  25. How to avoid collinearity in regression

    Hi there, I am new in statistics so my question will be a bit naive. When I perform regression, some variables are excluded. It is, maybe, because...

    Started by AsoInfo‎, 09-05-2012 01:22 AM
    • Replies: 9
    • Views: 5,579
    09-09-2012, 06:57 AM Go to last post
  26. Multiple regression, why use categories

    Hello, I have a question regarding multiple regression. I am reading a paper in which the author performed a multiple regression to predict...

    Started by bradyj2‎, 09-06-2012 06:27 AM
    • Replies: 7
    • Views: 2,371
    09-08-2012, 05:47 AM Go to last post
  27. SAS proc reg/spec - Why are binary predictors flagged for singular matrix?

    Hello all - I am building a simple linear regression model (OLS) with both continuous and binary independent variables paired with a continuous...

    Started by KateMiller‎, 09-07-2012 07:50 PM
    heteroscedasticity, linear regression, singular matrix
    • Replies: 0
    • Views: 2,861
    09-07-2012, 07:50 PM Go to last post
  28. Question Hosmer Lemeshow test - degrees of freedom

    Hello, I have to use HL test for logistic regression purposes. In the most of sources there is written, that number of degrees of freedom is n-2...

    Started by julo‎, 09-07-2012 05:20 AM
    degrees, freedom, hosmer, lemeshow, test
    • Replies: 0
    • Views: 2,305
    09-07-2012, 05:20 AM Go to last post
  29. Test for and remedy of multicollinearity in logistic regression with categorical IVs

    I was searching over net how can I test the presence of multicollinearity and what is its remedy in case the IVs are categorical in a logistic...

    Started by Blain Waan‎, 09-06-2012 02:08 PM
    multicollinearity, regresion
    • Replies: 2
    • Views: 4,562
    09-07-2012, 03:22 AM Go to last post
  30. Warning on Regression

    Hi, I'm trying to run logistic regression analysis but on the output it showed warning: "There is not enough memory for this run. Memory is used...

    Started by mscstats‎, 09-06-2012 02:52 PM
    • Replies: 11
    • Views: 2,397
    09-06-2012, 04:06 PM Go to last post
  31. Least significant variable regression

    Hello, Could somebody tell me what is the least significant variable in this regression analysis? What do you look for? Many thanks

    Started by bradyj2‎, 09-06-2012 12:08 PM
    • Replies: 3
    • Views: 2,781
    09-06-2012, 02:54 PM Go to last post
  32. Comparing relative importance within a subsample.

    Hey everyone, I was wondering if there was a statistical technique that allowed you to compare the differences in effect sizes across two...

    Started by CRIM‎, 09-06-2012 01:52 PM
    • Replies: 0
    • Views: 984
    09-06-2012, 01:52 PM Go to last post
  33. Logistic Regression with binomial dependent variable & binomial independent variable

    Hi all, I have a binary dependent variable (presence/absence) and a binary independent variable (also presence/absence) as well as two continuous...

    Started by killbot2000‎, 09-06-2012 08:29 AM
    • Replies: 3
    • Views: 2,812
    09-06-2012, 11:00 AM Go to last post
  34. Multicollinearity and the 'backward' regression method

    Hello, I have a question about multicollinearity and multiple regression. If you were to use the 'backward' selection method of regression...

    Started by bradyj2‎, 09-06-2012 09:04 AM
    • Replies: 0
    • Views: 2,455
    09-06-2012, 09:04 AM Go to last post
  35. 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: 2,222
    09-05-2012, 06:17 PM Go to last post
  36. Predicting non linear value

    Hello, sorry to cross post, but I initially posted this in the wrong forum. Im trying to build a model to project the number of customer reviews...

    Started by dude2000‎, 09-05-2012 10:53 AM
    • Replies: 0
    • Views: 890
    09-05-2012, 10:53 AM Go to last post
  37. Seeking to hire somebody to perform a regression on data

    Hi, I'm am looking to hire somebody to perform a multiple linear regression and produce a short report. I can pay 50 dollars. Would anybody...

    Started by bradyj2‎, 09-05-2012 09:29 AM
    • Replies: 0
    • Views: 949
    09-05-2012, 09:29 AM Go to last post
  38. Choosing a model

    Hi all, Probably a silly question, but I'm confused about what form of multiple regression to perform (stepwise, hierarchical, etc). If I perform...

    Started by kk89‎, 09-04-2012 03:38 AM
    • Replies: 1
    • Views: 1,246
    09-04-2012, 01:32 PM Go to last post
  39. How do I interpret this regression table with dummies?

    Hey, lets say I am running a regression with 3 factors. Also I have a dummy variable which takes the value 1 if a bank has a low capital ratio...

    Started by baller16‎, 09-04-2012 02:06 AM
    • Replies: 0
    • Views: 2,776
    09-04-2012, 02:06 AM Go to last post
  40. Linear regression - when errors are correlated and from different f distributions

    Hi all, This question relates to research assessing the hearing of new born babies. As mentioned in the title, I wished to solve the univariate...

    Started by Sooty‎, 09-04-2012 01:35 AM
    correlated errors, f-distributed errors, linear regression
    • Replies: 0
    • Views: 1,056
    09-04-2012, 01:35 AM Go to last post
  41. Exclamation moderated hierarchical regression

    Hello, I urgently need help. I have to test a hypothesis regarding moderating role. I know the procedure how to do it in SPSS with moderated...

    Started by ana2012‎, 09-03-2012 02:51 PM
    • Replies: 0
    • Views: 3,164
    09-03-2012, 02:51 PM Go to last post
  42. 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: 2,161
    09-03-2012, 11:58 AM Go to last post
  43. Logistic Regression or Chi Square?

    Hi everyone, I am a stats noob and am currently doing my fourth year thesis, examining moral development in children and adolescents. My design so...

    Started by melliehop‎, 08-30-2012 09:28 AM
    • Replies: 4
    • Views: 12,351
    09-03-2012, 08:34 AM Go to last post
  44. Regression Analysis Based on Condition

    Hi there, I am trying to do a regression analysis. My columns looks like this: AA 1 GG 2 AG 2 If the column 2 contains "2" so...

    Started by AsoInfo‎, 09-02-2012 12:49 AM
    conditional regression, regression analysis
    • Replies: 4
    • Views: 2,349
    09-02-2012, 11:59 PM Go to last post
  45. lme4 Fixed Effect Model Code: Does this make sense?

    Hi folks, I posted in an earlier message about the modeling I'm doing for my thesis, in which I'm looking at how three factors(biocontrol...

    Started by jeskill‎, 09-02-2012 04:39 PM
    • Replies: 1
    • Views: 1,761
    09-02-2012, 05:38 PM Go to last post
  46. Unhappy How to interpret ordered logit regression output?

    Hi, attached is my ordered logit output.. someone please help make sense of it.. dont know where to start:

    Started by maryt‎, 09-02-2012 02:42 PM
    • Replies: 1
    • Views: 2,506
    09-02-2012, 02:49 PM Go to last post
  47. what is the highest number of variables to use for regression analysis?

    Hi, Just wanted to ask what people thought was the highest number of variables could be used with regression analysis? Also, are there other...

    Started by arkantosno1‎, 09-01-2012 09:37 AM
    • Replies: 5
    • Views: 1,286
    09-01-2012, 01:43 PM Go to last post
  48. 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: 2,444
    09-01-2012, 10:54 AM Go to last post
  49. WLS in application

    Dear stats experts I am aware that the following questions are maybe trivial but I never really got it. Consider I have data of one subject...

    Started by statsdonkey‎, 08-16-2012 06:35 PM
    • Replies: 1
    • Views: 1,336
    09-01-2012, 02:18 AM Go to last post
  50. Sufficient variability

    Hello. I would really appreciate some help conceptualizing a problem that I seem to be having with some data that I've been working with. I was told...

    Started by Gradstudent5‎, 08-31-2012 04:19 PM
    • Replies: 1
    • Views: 2,734
    08-31-2012, 06:41 PM Go to last post
  51. Question Ordered Logistic Regression Model

    I am using SPSS to run ordered logit model on my categorical data but each time i end up receiving warnings like "the number of cells with zero...

    Started by maryt‎, 08-27-2012 07:30 AM
    • Replies: 2
    • Views: 1,961
    08-31-2012, 04:26 PM Go to last post
  52. How to use Logistic Regression to get info for Sobel test?

    Hello, Is it possible to use logistic regression to get info for Sobel test, the same way as using linear regression? If so, what are the variables...

    Started by yonikushnir‎, 08-31-2012 11:07 AM
    • Replies: 0
    • Views: 1,362
    08-31-2012, 11:07 AM Go to last post
  53. Output of an AR process.

    Hello, I modelize returns serie with an AR model using GRETL. Here are the outputs (red and right : the original data; blue and left: the...

    Started by Latiole‎, 08-29-2012 05:13 PM
    • Replies: 1
    • Views: 7,562
    08-31-2012, 04:52 AM Go to last post
  54. How to use a regression analyis to cross calibrate two sensors

    I have two temperature sensors that I need to calibrate to each other, and I'm thinking a regression analysis is the best way to go about this. But...

    Started by Vintervoo‎, 08-31-2012 04:05 AM
    regresion analysis
    • Replies: 0
    • Views: 1,746
    08-31-2012, 04:05 AM Go to last post
  55. P-value for Polynomial Linear Regression and Testing for R^2 Significance Changes

    I am doing some trend estimation in Excel on some daily revenue data and I have fitted a polynomial regression line using the trend estimation tool....

    Started by Panda2000‎, 08-30-2012 03:13 PM
    • Replies: 0
    • Views: 2,573
    08-30-2012, 03:13 PM Go to last post
  56. Interpretation of estimated coefficients

    Started by TrueTears‎, 08-30-2012 11:10 AM
    • Replies: 9
    • Views: 7,427
    08-30-2012, 02:24 PM Go to last post
  57. Question could not find the command for "logistic regression" under analyze in SPSS19

    I have been tryibg to do a logistic regression in SPSS 19. But somehow I could not find the option/command in the "regressions" section under...

    Started by BarryZheng‎, 08-29-2012 10:26 PM
    • Replies: 0
    • Views: 961
    08-29-2012, 10:26 PM Go to last post
  58. Help on count dependent variable

    Hello! I am new to this forum. I am bombarded by a lot of info on count DVs. Here are my variables: a. DV= firm-year observations. 7 years, 101...

    Started by umi40‎, 08-29-2012 09:44 PM
    count dependent variable, method, poisson
    • Replies: 0
    • Views: 963
    08-29-2012, 09:44 PM Go to last post
  59. 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: 1,521
    08-29-2012, 09:41 PM Go to last post
  60. What to report in a mediation analysis

    Hello Given my comprehensive lack of statistical knowledge, I have gained a lot of information over the last five months browsing this forum. But...

    Started by honeybegentle‎, 08-27-2012 04:18 PM
    • Replies: 2
    • Views: 25,947
    08-28-2012, 07:10 PM Go to last post

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