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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Dependent Variable and Independent Variable both range from negative to positive?

    Hi. While I have some statistical analysis experience, I usually rely on my trust multinomial logistic regression! Linear regression is out of my...

    Started by traciespiro‎, 03-04-2014 02:46 PM
    • Replies: 0
    • Views: 1,595
    03-04-2014, 02:46 PM Go to last post
  2. Dependent variable as a percentage-which model to use

    Hello, I am dealing with a dependent variable which is a percentage, so which regression model would be better in this case? The histogram and...

    Started by pff‎, 01-07-2011 06:59 AM
    • Replies: 1
    • Views: 6,358
    01-09-2011, 02:08 PM Go to last post
  3. Dependent variable as percentage

    Hi, if I have a regression model where the dependent variable is expressed in percentages, with a lot of zero values (say about half of the...

    Started by Student457‎, 05-20-2014 04:20 PM
    • Replies: 3
    • Views: 2,226
    05-30-2014, 05:38 AM Go to last post
  4. Lightbulb Dependent variable in regression model - sum of factors?

    I got across below article due to one of our student used it for the brand loyalty measure. ...

    Started by Fairy‎, 06-17-2014 04:37 AM
    • Replies: 1
    • Views: 1,205
    06-17-2014, 05:30 AM Go to last post
  5. Dependent variable is function of itself

    I have a model: qty=a.price+....(other IVs) Price is calculated as sales_amount/qty. Hence for a customer, if we aggregate data of a certain...

    Started by abhik‎, 02-27-2015 01:17 PM
    • Replies: 2
    • Views: 1,841
    02-27-2015, 08:55 PM Go to last post
  6. Dependent variable is on a four point scale

    I have a dependent variable on a four point satisfaction scale. It is clearly at least ordinal in nature, it may be interval although we are not...

    Started by noetsi‎, 02-18-2013 10:59 AM
    • Replies: 0
    • Views: 2,415
    02-18-2013, 10:59 AM Go to last post
  7. Dependent variable issues: (i) Mild skewness and (i) Measurement error

    Cross-sectional \hat{Y}_i = a + b X_i + e_i over i \in \{1,2,...,300\}. \hat{Y}_i's were estimated in a different regression (specifically, 300...

    Started by derksheng‎, 08-16-2012 07:12 AM
    • Replies: 6
    • Views: 1,776
    08-17-2012, 10:08 AM Go to last post
  8. Dependent variable kurtosis

    How important is it for the Dependent Variable in a multiple regression to show normal distribution? I have read apparently contradictory...

    Started by Labtec‎, 05-03-2009 07:22 AM
    • Replies: 2
    • Views: 3,363
    05-03-2009, 06:01 PM Go to last post
  9. Derivation of an equation of Influential Analysis in OLS

    Hi to everyone, I'm new to this forum and I'm very pleased for the existence of this forum, since the fact that forums in these times are in decay....

    Started by alexjmackh_94‎, 04-16-2017 07:05 PM
    econometrics, influential outliers, ols
    • Replies: 2
    • Views: 576
    04-17-2017, 10:32 PM Go to last post
  10. 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: 1,633
    09-16-2012, 12:34 AM Go to last post
  11. Derivation of t-test for regression coefficient

    Hello, at the moment I am researching, if the t-statistic is appropriate for a significance test of the regression coefficient on a dummy...

    Started by consuli1‎, 12-26-2013 06:33 PM
    • Replies: 4
    • Views: 2,301
    12-28-2013, 12:36 PM Go to last post
  12. Derivation of the lack of fit sum of suares

    Hi, Can anyone show me step by step how to derive the lack of fit sum of squares, I would be very thankful, I'm so lost in this. Thank you.

    Started by justa18unlv‎, 03-29-2012 11:57 AM
    • Replies: 1
    • Views: 2,128
    03-29-2012, 12:05 PM Go to last post
  13. Smile Derived importance of attributes in a political survey

    Hello! I'd like to ask some help with determining derived importance of attributes (like what are given by Shapley values /...

    Started by thehiggsboson‎, 06-18-2014 09:49 AM
    • Replies: 1
    • Views: 2,486
    07-15-2014, 06:35 PM Go to last post
  14. Deriving further values from regression coefficients

    Hi, Iím hoping someone can help me. Iím trying to derive another value from the coefficients of two regression equations. I have 2 regression...

    Started by Noble‎, 01-19-2017 09:43 AM
    cauchy, coefficients, regression
    • Replies: 0
    • Views: 1,839
    01-19-2017, 09:43 AM Go to last post
  15. Deriving Multiple Regression Line

    How do I derive the multiple regression line y=a+b1x1+b2w2 using method of least squares not matrix? I know I need to set ds/da=0, ds/b1=0 and...

    Started by marleygrace‎, 10-05-2012 03:10 AM
    • Replies: 2
    • Views: 1,602
    10-05-2012, 10:03 AM Go to last post
  16. [SOLVED] Describe curve of growth model

    I'm reading a paper now and want to describe the curves as seen here: Are the bottom 2 lines considered exponential decay. What would the...

    Started by trinker‎, 03-18-2014 01:26 PM
    • Replies: 8
    • Views: 1,939
    03-18-2014, 08:05 PM Go to last post
  17. Descriptive research and regression analysis?

    Please pardon my ignorance...can I use multiple regression analysis in a descriptive research design to answer my hypotheses? If not, can anyone...

    Started by reakhavok‎, 09-18-2010 01:53 PM
    • Replies: 4
    • Views: 8,402
    09-19-2010, 01:11 PM Go to last post
  18. Design structure in logistic regression with categorical predictors

    Hi, This is my first post. I am building binary logistic regression models in SAS. Now I had some categorical predictors as well as some...

    Started by Dipanjan‎, 04-02-2012 05:10 AM
    • Replies: 0
    • Views: 2,006
    04-02-2012, 05:10 AM Go to last post
  19. Design question: proportion explained variance by placebo effect

    Dear all, I have a design question about investigating a placebo effect. Does anyone have a clue how to analyze the proportion explained variance...

    Started by maart91‎, 02-12-2015 07:37 AM
    • Replies: 2
    • Views: 1,283
    02-13-2015, 04:23 AM Go to last post
  20. Desperate to get a handle on regression

    I'm looking at predictors of helmet use amongst skiers. (200 subjects sent a questionnaire.) I have 5 or 6 categorical data columns such as...

    Started by txc876‎, 05-22-2011 10:22 AM
    • Replies: 2
    • Views: 1,772
    05-23-2011, 07:02 AM Go to last post
  21. Desperately Need Help with Regression Analysis..Please :)

    hello :) I'm new here (and in doing statistics in general). I have to do a regression analysis on panel data (10 groups, 9 years - 90...

    Started by jayde‎, 01-20-2011 04:03 AM
    multiyear data
    • Replies: 4
    • Views: 3,474
    01-20-2011, 11:17 AM Go to last post
  22. detecting a variance trend in random effects

    Greetings I have a measurements on grouped individuals. There are approximately 100 groups, and approximately 500 individuals per group, with...

    Started by PSellaz‎, 12-19-2011 02:46 PM
    epidemiology, mixed effects models, multi-level data
    • Replies: 0
    • Views: 1,839
    12-19-2011, 02:46 PM Go to last post
  23. Detecting and adjusting for heteroskedasticity in ordinal logistic models

    Does anyone know how to check whether heteroskedasticity is present in an ordinal logistic regression analysis? And, if present, how can it be...

    Started by KV Weyde‎, 06-09-2016 03:13 AM
    • Replies: 0
    • Views: 1,046
    06-09-2016, 03:13 AM Go to last post
  24. Detecting fake results

    Hello everyone, I am currently working together with a fellow student on analyzing what factors affect profitability in banking, by using a...

    Started by Eina‎, 08-19-2016 12:07 PM
    • Replies: 5
    • Views: 1,525
    08-19-2016, 03:40 PM Go to last post
  25. determine / eliminate influence of confounding variable on 10 data series

    Any help with the problem below would be greatly appreciated. I have very little knowledge of statistics. I am using excel. I have measured...

    Started by khe‎, 12-31-2013 01:34 PM
    confounding variable, pollution
    • Replies: 1
    • Views: 970
    12-31-2013, 02:45 PM Go to last post
  26. Determine Confounding using Multivariate analysis

    After we adjusted for confounders in the Multivariate analysis, How do we determine that if the variable is confounding or not? I read somewhere...

    Started by sandyzman‎, 08-11-2017 01:49 PM
    • Replies: 1
    • Views: 222
    08-11-2017, 02:04 PM Go to last post
  27. Determine how much data is required by determining when graph levels out

    I have a bunch of graphs for data that I have collected in my last experiment. The graphs are usually shaped similar to either exponential curves or...

    Started by Phdstudentz‎, 07-11-2014 05:13 PM
    levels out, minimum data, steady state
    • Replies: 12
    • Views: 2,019
    07-15-2014, 06:52 AM Go to last post
  28. Determine if a quadratic regression is appropriate for the data?

    How does one determine if a quadratic regression is appropriate for the data? I am using the programming language R. I have data that I would like to...

    Started by danielh‎, 06-21-2014 08:28 PM
    • Replies: 1
    • Views: 1,364
    06-22-2014, 01:12 AM Go to last post
  29. Determining best independent variables through factor analysis

    Hi everyone, I have a dependent variable and 18 independent variables. I remember from an applied statistics class I took, that there is a way to...

    Started by gophins‎, 10-25-2010 05:39 PM
    • Replies: 0
    • Views: 2,202
    10-25-2010, 05:39 PM Go to last post
  30. Determining Classification accuracy of a Multinomial Logistic Regression using R nnet

    Hi, I am trying to assess the classification accuracy for a Multinomial Logistic Regression model using R. I have adapted the example below to my...

    Started by cometorta‎, 08-03-2016 04:50 PM
    false positives mlr
    • Replies: 1
    • Views: 1,676
    08-03-2016, 09:50 PM Go to last post
  31. Determining if Cook's D is influential

    Hi there, I have been having a lot of difficulty calculating if Cook'd values are influential. I realise that there are no exact rules, but I am...

    Started by tbuzz‎, 05-10-2015 08:55 PM
    • Replies: 0
    • Views: 1,467
    05-10-2015, 08:55 PM Go to last post
  32. Determining residual outliers when heteroskedasticity exists

    Hi, I was wondering if anyone has any thoughts on the best way to approach the detection of outliers based on residuals from a linear regression...

    Started by talkbox‎, 08-03-2016 07:13 AM
    regression
    • Replies: 3
    • Views: 1,451
    08-03-2016, 01:46 PM Go to last post
  33. Determining the Standard Deviation (vice Standard Error) of regression coefficients?

    This is a question Iíve been wondering about for a while, but perhaps itís not possible or perhaps I just need a point in the right direction. I...

    Started by LKM‎, 12-24-2012 02:17 PM
    • Replies: 6
    • Views: 1,592
    01-09-2013, 11:55 AM Go to last post
  34. Determining the weight of variables

    I am trying to determine if one of the numbers in regression summary provide the weight of the important of each variable? Here is an example: ...

    Started by MikeDrohan‎, 06-26-2015 09:10 AM
    regression analysis
    • Replies: 4
    • Views: 1,260
    06-29-2015, 07:06 AM Go to last post
  35. 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: 3,146
    03-26-2012, 06:20 PM Go to last post
  36. Develop analysis plan on Medical data - trend analysis and model

    First, let me say thank you for any help you can give. I have been searching for nearly two days for a solution to my problem and continue to be...

    Started by JHale‎, 02-24-2011 08:43 AM
    • Replies: 1
    • Views: 7,955
    02-24-2011, 11:20 AM Go to last post
  37. Develop regression model while given "average" data

    I'm stuck on the following question and would like some guidance please: From a study, the average heights of Grade 5, Grade 6 and Grade 7 boys...

    Started by hank755‎, 11-28-2010 10:31 AM
    • Replies: 2
    • Views: 2,896
    11-28-2010, 06:32 PM Go to last post
  38. Developing a function/algorithm to solve for voltage drift

    Hey guys, So in one of my classes we are studying composite materials. We did an experiment where a piece of composite material was anchored at...

    Started by benanderson08‎, 02-13-2014 10:04 AM
    • Replies: 0
    • Views: 1,066
    02-13-2014, 10:04 AM Go to last post
  39. deviance

    can anybody please tell me why we need to multiply difference of likelyhoods by "-2"? Where this 2 came from, why not 3? Could not find answer

    Started by antonitsin‎, 07-27-2011 02:25 PM
    deviance, glm diagnostocs
    • Replies: 3
    • Views: 2,183
    07-29-2011, 11:24 AM Go to last post
  40. Deviance

    Just trying to understand generalised linear models, and got this from S+. I must have fallen asleep when the null and residual deviances were...

    Started by Prometheus‎, 03-27-2014 03:47 PM
    • Replies: 1
    • Views: 1,581
    03-27-2014, 03:50 PM Go to last post
  41. Deviance residuals in model fitted via MCMC

    I fitted a regression model in a Bayesian approach via MCMC. The JAGS code for the model is model{ for(i in 1:n) { y ~ dbeta(alpha, beta) alpha...

    Started by askazy‎, 05-26-2017 09:39 PM
    • Replies: 0
    • Views: 747
    05-26-2017, 09:39 PM Go to last post
  42. df fot BETA t-test in ANCOVA

    Hi All, Perhaps this would be a silly question but, in ANCOV, what is the DF for t-test value for a covariate BETA coefficient calculated...

    Started by mcdomell‎, 06-28-2013 04:36 AM
    ancova, beta coefficient, degrees of feedom, t-test
    • Replies: 0
    • Views: 1,625
    06-28-2013, 04:36 AM Go to last post
  43. Dfbeta for categorical/dummy variables

    Hello :) In my regression analysis (in Stata), I'm generating dfbetas. Can we take into account dfbeta of categorical or dummy variables higher...

    Started by cquetstr‎, 06-23-2014 08:43 AM
    categorical variables, dfbeta
    • Replies: 0
    • Views: 3,278
    06-23-2014, 08:43 AM Go to last post
  44. Dgrees of freedom of error sum of squares

    For a given metal a experiment was carried out to measure the heat variation with temperature in Celsius.The heat was measured twice at each chosen...

    Started by Clarkson‎, 07-02-2014 05:39 AM
    anova, degrees of feedom, regression analysis
    • Replies: 2
    • Views: 1,401
    07-02-2014, 05:46 AM Go to last post
  45. Diagnostics for logistic regression

    Anyone have any suggestions, or better links, on diagnostics for logistic regression. I know many of the assumptions (and thus tests such as...

    Started by noetsi‎, 07-03-2013 09:57 AM
    • Replies: 2
    • Views: 1,677
    07-03-2013, 01:03 PM Go to last post
  46. Diagnostics in regression: A visual example

    The follwing R-code/picture shows a simple linear regression with no outliers and 3 different kind of outliers. It also plots the diagnostic values,...

    Started by thedreamshaper‎, 12-13-2010 07:01 AM
    • Replies: 0
    • Views: 3,191
    12-13-2010, 07:01 AM Go to last post
  47. Dichotomized predictor with dichotomized response

    I have a dichotomized predictor which can be 0 or 1 and it predicts correctly roughly 80% of the time if a patient is cured 1 or not 0. I tried...

    Started by blogzter‎, 01-28-2013 01:39 PM
    • Replies: 4
    • Views: 1,877
    01-29-2013, 12:50 PM Go to last post
  48. 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
  49. Did i get theese right i am confused, can anyone help me please

    25. In multiple regression analysis, residual analysis is used to test the requirement that A) the variation in the residuals is the same for all...

    Started by Bicano‎, 11-30-2008 08:26 PM
    • Replies: 2
    • Views: 21,379
    11-30-2008, 09:08 PM Go to last post
  50. Did I just fudge this categorical data transformation too much?

    I have a public data set gathered from 336 hospitals, with about 28,000 rows. I want to see if there is relationship between a particular input...

    Started by greg.neyman‎, 05-02-2011 04:33 PM
    categorical data analysis, dummy variables
    • Replies: 7
    • Views: 3,750
    05-05-2011, 05:05 PM Go to last post
  51. difference between 2x2-table and binary logistic regression

    Hello, I have to find out what is the (conceptual) difference between the tests. I don't really know what my means. I know they ARE different, but...

    Started by Lychee‎, 01-27-2012 11:42 AM
    • Replies: 4
    • Views: 3,420
    01-27-2012, 01:54 PM Go to last post
  52. Difference between a VAR and a VECM

    Hello, I am performing cointegration analysis using Eviews and the DOLS estimator in the cointegrating equation. After saving the residuals of...

    Started by Reynaldo2007‎, 08-02-2016 09:55 PM
    econometrics, var, vecm
    • Replies: 0
    • Views: 2,085
    08-02-2016, 09:55 PM Go to last post
  53. Post Difference between two regression coefficients

    Hi All: This is the context. I have three x variables with following relationship: x1 + x2 = x3. Now, I run these two equations: y = a1 + b1x1...

    Started by hs2000‎, 03-12-2015 09:01 PM
    • Replies: 1
    • Views: 1,271
    03-13-2015, 08:18 AM Go to last post
  54. Difference in Differences (DID) - control group question

    Hi, I am considering doing the following and I am wondering whether it makes statistical sense. I am interested in comparing the time spent...

    Started by Laco‎, 05-01-2012 12:35 PM
    • Replies: 0
    • Views: 1,123
    05-01-2012, 12:35 PM Go to last post
  55. Difference in Differences in a linear regression framework

    I am looking to incorporate difference in differences (DiD) into a regression framework, and all the examples I have found of such usage in peer...

    Started by mferrigno‎, 01-29-2014 11:48 AM
    • Replies: 1
    • Views: 1,779
    01-29-2014, 09:53 PM Go to last post
  56. Difference in ranking values

    Hi all. For my PhD Thesis I have a question asking participants to rank 4 people on the basis of their preference. My supervisor asked me to...

    Started by scandone86‎, 01-31-2014 10:28 AM
    • Replies: 0
    • Views: 891
    01-31-2014, 10:28 AM Go to last post
  57. Difference in ROC curve - statistical test?

    Is there a test to determine if C (the area under a ROC curve) is significantly different than another C? Or does this question even make theoretical...

    Started by noetsi‎, 04-18-2013 03:12 PM
    • Replies: 3
    • Views: 3,850
    04-24-2013, 06:10 PM Go to last post
  58. Difference multinomial logistich with ordinal dependent and ordinal regression

    Hi :) I am looking at a very large dataset in which I want to do a regression analyses on an ordinal variable (scores on a test divided in 4...

    Started by inge1804‎, 04-03-2014 04:43 AM
    • Replies: 0
    • Views: 927
    04-03-2014, 04:43 AM Go to last post
  59. Difference-in-difference regression

    Hello, I have a problem with my current research project and I am not very experienced with statistics so it would be great to find some help...

    Started by ERa‎, 08-16-2015 01:46 AM
    difference in difference, difference-in-difference, ols, ols regression, regression
    • Replies: 0
    • Views: 1,219
    08-16-2015, 01:46 AM Go to last post
  60. Difference-in-difference testing

    Hi folks -- Never posted to this forum before, so forgive me if I make an error or three. I'm trying to conceive of how to do significance...

    Started by ultros‎, 10-31-2013 04:49 PM
    • Replies: 0
    • Views: 2,068
    10-31-2013, 04:49 PM Go to last post

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