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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. (Beginner!) Questions about regression on CD album sales/internet use/digital music s

    Hello, I am attempting to perform a regression on what has caused the reduction in CD album sales, and need a little assistance. I have 28 data...

    Started by ontheroadtofindout‎, 03-27-2012 12:07 PM
    • Replies: 1
    • Views: 1,967
    03-29-2012, 09:34 AM Go to last post
  2. When should I report heteroskedasticity robust standard errors?

    With regard to a master's thesis in economics I am working on I am running six regressions (see attachment). I find evidence for heteroskedasticity...

    Started by arnetheman‎, 03-29-2012 07:22 AM
    • Replies: 0
    • Views: 2,044
    03-29-2012, 07:22 AM Go to last post
  3. Comparing curves fitted to two quadratic regressions

    Hello, I have constructed two calibration curves, i.e. plotting known concentrations against response. Both of these sets of data seem to fit a...

    Started by Ri89‎, 03-08-2012 07:19 AM
    curves, quadratic regression
    • Replies: 2
    • Views: 4,188
    03-28-2012, 07:30 PM Go to last post
  4. Which regression should I use?????? HELP

    I have a questionnaire with where respondents were asked if they remember seeing a TV commercial, a radio commercial and a magazine add. “Yes or no...

    Started by Kframnes‎, 03-16-2012 04:51 AM
    • Replies: 2
    • Views: 2,207
    03-28-2012, 04:20 PM Go to last post
  5. Heckman model

    Hi, I'm running a heckman model however some issues have arisen: 1. The log likelihood function is not concave and does not converge after a...

    Started by economix‎, 03-28-2012 04:11 PM
    • Replies: 0
    • Views: 2,494
    03-28-2012, 04:11 PM Go to last post
  6. a question about estimates in mixed models

    Hello, I was hoping to be able to find all of the estimates of covariates and of the categories with a number of factors. I found a similar study...

    Started by Dragonwalker‎, 03-28-2012 12:55 AM
    • Replies: 0
    • Views: 1,302
    03-28-2012, 12:55 AM Go to last post
  7. unrestricted cumulative probit model with vglm()---extend to a multivariate setting?

    Hello. I'm trying to fit a multivariate, unrestricted cumulative probit model. I've had success in fitting a proportional odds probit model using...

    Started by @nthRo‎, 03-27-2012 06:44 PM
    • Replies: 0
    • Views: 1,914
    03-27-2012, 06:44 PM Go to last post
  8. Interaction effect: Do the single variables both need to be significant?

    Dear all, If you have a regression model Y=b0+b1*A+b2*B+b3*A*B, and the dependent variable A and the interaction effect A*B have significant...

    Started by MDT‎, 03-26-2012 04:45 PM
    • Replies: 2
    • Views: 2,141
    03-26-2012, 06:22 PM Go to last post
  9. Determining weighting factors from linear regression

    Hi, I am working on a digital filtering project where I am trying to optimize a filter for a Doppler ultrasound application. Without going in to...

    Started by arefox‎, 03-26-2012 06:20 PM
    • Replies: 0
    • Views: 3,144
    03-26-2012, 06:20 PM Go to last post
  10. 95% confidence intervals for linear regression in excel?

    Hi, I am currently trying to analyse data for my lab experiment and I am having trouble trying to find how to plot individual confidence intervals...

    Started by Paulo1913‎, 03-11-2012 10:42 PM
    • Replies: 1
    • Views: 16,679
    03-26-2012, 11:15 AM Go to last post
  11. Is my sample too big ?

    Hello, I have a sample of 20 continuous variables, along with 3 explanatory (2 continuous and 1 dummy). I am trying to run a regression, linear...

    Started by NN_STAT‎, 03-19-2012 01:48 PM
    • Replies: 3
    • Views: 3,047
    03-26-2012, 10:55 AM Go to last post
  12. Significant Effects after Including Interaction Variable (?) :confused:

    Dear all, I hope you could help me with the following: I have tested two regression models, one with inependent variable A, B, C, D, E and one...

    Started by MDT‎, 03-26-2012 08:57 AM
    • Replies: 0
    • Views: 1,415
    03-26-2012, 08:57 AM Go to last post
  13. help appreciated with a validation exercise

    Hello all, I would really appreciate your help with some statistical analysis (yukh! haha!) A psychometric test has been mapped onto a companies...

    Started by mfarskoury‎, 03-26-2012 06:27 AM
    correlation, mapping, regression, validation
    • Replies: 0
    • Views: 1,105
    03-26-2012, 06:27 AM Go to last post
  14. Cool Regression with non- parametric data....

    Hello! I have conducted the normality test Anderson-Darling on my data, and with a p value of <0,010, I guess that the data are not normal...

    Started by Rebecka‎, 03-24-2012 08:35 AM
    • Replies: 8
    • Views: 5,614
    03-26-2012, 03:42 AM Go to last post
  15. Where in the Regression Output tells me which are the strongest predictor variables?

    Hi, I'm no statitician (yet), but I'm having a go!! - am looking to design an employee survey and analyse the data in Excel. I have watched many...

    Started by cjcass‎, 03-24-2012 07:36 AM
    • Replies: 4
    • Views: 4,395
    03-25-2012, 01:03 PM Go to last post
  16. using a binary response for a mixed model

    Hello, My journey through mixed models (which is documented in past questions) has been an arduous one, however I appreciate being introduced to...

    Started by Dragonwalker‎, 03-25-2012 01:01 PM
    mixed-models binary lme4
    • Replies: 0
    • Views: 1,529
    03-25-2012, 01:01 PM Go to last post
  17. Panel Data (Random or Fixed)

    The r = a +bx. is the model There is data for 3 time periods. Are there fixed effects present? Estimate the parameters a and b. The code below...

    Started by samulleg364‎, 03-24-2012 06:45 PM
    • Replies: 0
    • Views: 1,638
    03-24-2012, 06:45 PM Go to last post
  18. Conditional regression

    Hi all, I am trying to run explanatory regression: Y = alpha + Beta1*X*I{X.*Y>0}+Beta2*X*I{X.*Y<=0} where I{} is indicator function Since...

    Started by JustinasBr‎, 03-24-2012 05:35 PM
    conditional regression, dependent variable on rhs
    • Replies: 2
    • Views: 2,195
    03-24-2012, 05:49 PM Go to last post
  19. Best way to control for weekdays when regressing sales data against time.

    I'm trying to use multiple regression to model sales data per day since Jan 1, 2010. I have established a "time index" to facilitate this. So...

    Started by machinist‎, 03-23-2012 11:21 AM
    • Replies: 2
    • Views: 2,127
    03-24-2012, 05:49 PM Go to last post
  20. Production function CES or Cobb-Douglas

    The data y v1 v2 p w1 w2 is data for the estimation of a production function y = f(v1 ,v2). Is Cobb-Douglas or CES? Estimate the parameters. (p=...

    Started by samulleg364‎, 03-24-2012 05:19 PM
    • Replies: 0
    • Views: 2,785
    03-24-2012, 05:19 PM Go to last post
  21. Random Effects Model and Serial Correlation

    I am working on a model where I am using a random effects model. This might seem like a simple question but does the use of the random effects model...

    Started by ohjosr‎, 03-24-2012 10:13 AM
    • Replies: 0
    • Views: 1,431
    03-24-2012, 10:13 AM Go to last post
  22. p-value of anova when comparing models

    I am asking a new question, however the dataset is related to other questions that I have posted. I am running lmer to determine which factors have...

    Started by Dragonwalker‎, 03-24-2012 09:59 AM
    • Replies: 0
    • Views: 1,881
    03-24-2012, 09:59 AM Go to last post
  23. multiple linear regression rejected - searching for alternative model

    Hey there! I am currently working on a regression model for a logistics problem which includes the transport time as dependent variable and a...

    Started by evident‎, 03-16-2012 09:54 AM
    • Replies: 1
    • Views: 1,760
    03-21-2012, 11:29 PM Go to last post
  24. I think I may finally understand, but a few questions

    Please note that you will find a simplified question below in case you do not have the time to check all of my scripts in the first two posts, but...

    Started by Dragonwalker‎, 03-20-2012 11:18 AM
    mixed-effects aic
    • Replies: 6
    • Views: 2,036
    03-21-2012, 12:28 PM Go to last post
  25. Post which regression analysis model shall i use?

    i am conducting a research on 9 insurance companies from which a 5 year data is collected. Thus, i have to use panel model, but which model fixed...

    Started by asamnew‎, 03-21-2012 04:55 AM
    • Replies: 0
    • Views: 1,406
    03-21-2012, 04:55 AM Go to last post
  26. Interpreting the conclusion of t-test and explaining the p-value

    Hi, I'm working on an assignment which asks me to interpret the conclusion of my t-test regarding the average reading score and the student teacher...

    Started by shle‎, 03-21-2012 02:13 AM
    • Replies: 0
    • Views: 5,846
    03-21-2012, 02:13 AM Go to last post
  27. Regress y on y-hat

    I need some help to prove that when you regress y on y-hat, the least squares regression line is y = y-hat. y = 0 + 1(y-hat). Thanks!

    Started by jwdzurik‎, 03-20-2012 02:49 PM
    • Replies: 0
    • Views: 2,030
    03-20-2012, 02:49 PM Go to last post
  28. Back-calculating correlation coefficient for transformed data

    Hi everyone, This is my first post on this board so please excuse if I sound like a n00b. I am doing a meta-analysis on plant physiology studies,...

    Started by qdread‎, 03-20-2012 01:08 PM
    • Replies: 0
    • Views: 2,138
    03-20-2012, 01:08 PM Go to last post
  29. Plotting

    Is there any way to plot a normal distributions density tilted on its side along the regression line of a simple linear regression. Meaby just 3-5...

    Started by thedreamshaper‎, 03-19-2012 05:14 PM
    • Replies: 2
    • Views: 1,843
    03-20-2012, 08:57 AM Go to last post
  30. Transforming dependent variable

    I am using a multiple regression with one continuous DV and 9 IVs (mainly categorical and one continuous). My DV, as the mean score on a...

    Started by judith_sw‎, 03-19-2012 08:10 AM
    • Replies: 3
    • Views: 4,932
    03-20-2012, 07:17 AM Go to last post
  31. Mediation question

    If you want to test the hypothesis that the gender difference in brooding will account for the gender difference in anxiety, what would be my...

    Started by pinkk‎, 03-18-2012 10:28 AM
    • Replies: 1
    • Views: 1,294
    03-18-2012, 04:13 PM Go to last post
  32. xtlogit coefficient interpretations

    I'm working on a project where I am using a logit model in the program Stata. I'm using the xtlogit command with panel data for city and years. My...

    Started by ohjosr‎, 03-17-2012 01:46 PM
    • Replies: 0
    • Views: 3,557
    03-17-2012, 01:46 PM Go to last post
  33. Coefficients of delta-lognormal modeling

    I am trying to understand delta-lognormal modeling. Please bear with me. I am applying this method to some fishery data. This method combines...

    Started by elopomorph‎, 06-25-2011 06:27 PM
    delta lognormal
    • Replies: 2
    • Views: 3,962
    03-16-2012, 11:38 AM Go to last post
  34. plotting moderation

    Hi, I know that for most of you this will sound like a stupid question but I am teaching myself regression and I am quite new.. Does it make sense...

    Started by Sciarada‎, 07-02-2011 09:25 PM
    moderation plot, multinomial regression
    • Replies: 1
    • Views: 3,628
    03-16-2012, 09:30 AM Go to last post
  35. Help! model comparison in logistic regression

    Dear all, I'm working on a logistic regression and have now obtained two competing models (one computed by hand, the other with "step" in R). In...

    Started by caro‎, 03-15-2012 06:31 AM
    • Replies: 3
    • Views: 3,119
    03-16-2012, 03:17 AM Go to last post
  36. question on complete confounding and partial confounding in multiple regression

    While learning multiple regression, I once meet the concepts of “complete confounding” and “partial confounding” In the model, the response...

    Started by winecoding‎, 03-15-2012 10:37 PM
    • Replies: 2
    • Views: 5,139
    03-15-2012, 10:49 PM Go to last post
  37. When to address regression diagnostics on residuals?

    Hi, I have some data and have run a regression with all the variables in. I have then run the residual diagnostics but there are some issues. ...

    Started by regression_is_cool‎, 03-11-2012 08:44 AM
    • Replies: 1
    • Views: 2,058
    03-14-2012, 05:08 PM Go to last post
  38. Possible to analyze cross lag panel data with regression alone (no SEM)?

    I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

    Started by sm34833‎, 03-12-2012 06:21 PM
    panel data, regression, structural equation model
    • Replies: 7
    • Views: 14,018
    03-14-2012, 10:57 AM Go to last post
  39. Help! Deriving a support vector machine

    Given a training set of points not necessarily linearly separable, we have an SVM obtained by minimizing \frac{1}{2}\lambda \left \| \mathbf{w}...

    Started by spidercano‎, 03-13-2012 08:33 PM
    • Replies: 0
    • Views: 1,460
    03-13-2012, 08:33 PM Go to last post
  40. Multiple logistic regression intercept

    Hello guys and gals, I'm having a me***own trying to understand exactly what the intercept of a multiple logistic regression is telling me/ or if...

    Started by drewmac‎, 01-19-2012 12:40 AM
    • Replies: 3
    • Views: 3,371
    03-13-2012, 12:29 AM Go to last post
  41. Regression with continuous and dummy-coded categorical variables

    Hi everyone, I am trying to figure out differences in the proportions of fallen trees in three ZONES, and nested within ZONES, differences in...

    Started by lken‎, 03-12-2012 06:14 PM
    • Replies: 0
    • Views: 2,335
    03-12-2012, 06:14 PM Go to last post
  42. growth regression results

    I am doing a standard neoclassical growth regression for the European member states for the period 1991-2010. I regress GDP per capita growth on...

    Started by tedylov‎, 03-12-2012 06:02 PM
    • Replies: 0
    • Views: 1,750
    03-12-2012, 06:02 PM Go to last post
  43. 1 predictor, 2 different values for baseline statistic & change statistic?

    Hi, I am conducting a Cox Regression for my first time. I created a simple model with only 1 predictor (categorical), one dependent variable...

    Started by unipsychologist1‎, 03-12-2012 04:09 PM
    change score, chi-sqaured, cox, survival analysis
    • Replies: 0
    • Views: 1,894
    03-12-2012, 04:09 PM Go to last post
  44. Regression on sales,markdown,avgstock

    OUTPUT 1: Call: lm(formula = TySalesUnit ~ TyMarkdown + TyAvgStockUnit) Coefficients: t value Pr(>|t|) ...

    Started by masarimk‎, 03-12-2012 06:46 AM
    • Replies: 0
    • Views: 1,668
    03-12-2012, 06:46 AM Go to last post
  45. The standardized and non standardized coefficients gives diff results

    Hi. Some coworkers ran a regression and used first the beta to analyze the strength of the independent variables in a regression. However all the...

    Started by Kframnes‎, 03-09-2012 04:28 PM
    • Replies: 7
    • Views: 6,082
    03-09-2012, 05:21 PM Go to last post
  46. Binomial regression with x as the dependent variable and n as an independent variable

    Hi all I have a sample size of 100. Out of 100 a certain number are successful at stage one. Of those successful at stage one some are successful...

    Started by emily.stats‎, 03-05-2012 04:24 PM
    2 Pages
    1 2
    binomial, challenge
    • Replies: 15
    • Views: 4,371
    03-08-2012, 05:59 PM Go to last post
  47. warning at logistic reg.

    Hello, I am trying to do logistic regression analysis. The problem I face is that this warning comes out in my output : Due to redundancies,...

    Started by elpaki‎, 03-08-2012 06:51 AM
    • Replies: 0
    • Views: 2,624
    03-08-2012, 06:51 AM Go to last post
  48. Binary DV and orthogonal contrasts

    HEEEEEEEEELLLLPPPPPP!!!!! The data I am trying to analyse has a binary dependent variable (1=yes, 0=no) and tow factors. Factor 1 is a treatment...

    Started by matteovisentin‎, 03-08-2012 04:53 AM
    binary data, categorical data, contrasts, genlin
    • Replies: 0
    • Views: 1,712
    03-08-2012, 04:53 AM Go to last post
  49. Unhappy Single parent-offspring regression

    Does anyone know how to do this? I can't find the web page I found with the full explanation:shakehead Failing that, I am carrying out a study...

    Started by charlotte22‎, 03-08-2012 03:03 AM
    • Replies: 0
    • Views: 3,019
    03-08-2012, 03:03 AM Go to last post
  50. 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: 3,878
    03-07-2012, 02:06 PM Go to last post
  51. Moderation, GLM, and interactions. Discrepent results...

    Hello all, I'm running a GLM to test for moderation. One of my interaction terms (the product of two continuous variables) looks suspicious......

    Started by cellardoor.‎, 03-06-2012 07:04 PM
    • Replies: 0
    • Views: 2,544
    03-06-2012, 07:04 PM Go to last post
  52. Interaction terms between correlated predictors

    Hello, I'm trying to test how the amount of native forest in a landscape affects the number of bird species, and how this relationship varies with...

    Started by souffle‎, 03-01-2012 09:55 PM
    • Replies: 2
    • Views: 2,407
    03-06-2012, 06:12 PM Go to last post
  53. Need help understanding an equality associated with regression analysis

    Hi everyone, I am attempting to understand the implications the equality listed below has in regards to regression models. The equality is...

    Started by phightins530‎, 03-06-2012 02:13 PM
    • Replies: 4
    • Views: 2,171
    03-06-2012, 04:20 PM Go to last post
  54. Is Slope A statistically different from Slope B? *URGENT*

    Hey everyone, Really need urgent help here. I am trying to determine if the change in the slope of a line (beta) is statistically significant...

    Started by explicit‎, 03-06-2012 01:25 AM
    • Replies: 7
    • Views: 24,601
    03-06-2012, 11:39 AM Go to last post
  55. Does fitting of a regression line as such contribute to mass significance?

    Is the fitting of a regression line (least squares, for a given number of predictors) as such to be regarded a statistical test that can contribute...

    Started by Bassler‎, 03-06-2012 05:04 AM
    false positives, fitting a line, least squares, mass significance, regression line
    • Replies: 0
    • Views: 1,601
    03-06-2012, 05:04 AM Go to last post
  56. Semi-saturated Fixed Effects

    Today my supervisor instructed me to try to use semi-saturated Fixed Effects analysis. I have tried searching for "semi-saturated" and "saturated"...

    Started by Laco‎, 03-01-2012 01:07 PM
    • Replies: 4
    • Views: 2,815
    03-04-2012, 01:15 PM Go to last post
  57. 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: 1,922
    03-04-2012, 12:32 AM Go to last post
  58. Logistic Regression

    Hi, I am using R. For example, Y=β0 + β1X1+ β2X2 = log (a/(1-a)) where a = probability >g1<-glm(Count~X1+X2,family="binomial")...

    Started by paxy‎, 02-29-2012 02:40 AM
    • Replies: 1
    • Views: 1,312
    03-02-2012, 04:39 PM Go to last post
  59. Fixed Effects and interaction terms

    I am trying to analyze sex difference in housework time using longitudinal data with Fixed Effects. Since, sex is time-invariant I can not...

    Started by Laco‎, 03-01-2012 05:33 PM
    • Replies: 2
    • Views: 7,428
    03-01-2012, 06:01 PM Go to last post
  60. log linear model for dependence

    Hi I fitted a log linear model (proc genmod dist=negative binomial link=log) to see any dependence/association between 3 categorical variables. I...

    Started by szm‎, 02-29-2012 10:31 AM
    count, dependence, log linear, poisson regression
    • Replies: 2
    • Views: 1,955
    02-29-2012, 02:53 PM Go to last post

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