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Threads 2941 to 3000 of 4341

Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

  1. Expressing the sum of squared residuals as a matrix

    R, the n by 1 matrix of residuals, is given by y_i, an n by 1 matrix, minus X, an n by 2 matrix consisting of explanatory variables x_1 and x_2(where...

    Started by lm8ub‎, 06-06-2012 08:03 PM
    • Replies: 2
    • Views: 3,853
    06-09-2012, 09:24 PM Go to last post
  2. Multiple regression and correlation matrix

    Hi. I got some data I am about to present in a report. At first I created a correlation matrix, and there was no statistical significant...

    Started by stinestalker‎, 06-06-2012 02:54 PM
    • Replies: 2
    • Views: 3,476
    06-09-2012, 09:17 PM Go to last post
  3. Imputing missing values, and simulating the dependent variable in a regression

    Hi all, I've been working on filling in some missing income values in a data set using multiple imputation. To check the validity of my model, I...

    Started by eyesack_kn‎, 06-08-2012 05:08 PM
    • Replies: 0
    • Views: 2,607
    06-08-2012, 05:08 PM Go to last post
  4. Simple question regarding the OLS procedure...

    If I understand this equation correctly, if the transpose of x_i is an n by 2 matrix, then is the matrix x_i a 2 by n matrix? But isn't that a weird...

    Started by lm8ub‎, 06-06-2012 10:50 AM
    • Replies: 4
    • Views: 1,759
    06-06-2012, 11:43 AM Go to last post
  5. Question cohort regression analysis?

    Is a multiple regression analysis a good test for cohort or even nested cohort? Dependent variable is LDL cholesterol binomial YES?NO? for LDL 240 or...

    Started by Maureen‎, 06-06-2012 11:24 AM
    • Replies: 0
    • Views: 1,470
    06-06-2012, 11:24 AM Go to last post
  6. Exclamation Variance of a corrected regression coefficient

    Ppl I really need help! Please, help me solve it: Consider the model Yi = b0 + b 1Xi +ei e_i~N(0,s^2_e) iid X_i_N(m_x,s^2_x) iid Z_i = X_i +...

    Started by Arttemus‎, 06-05-2012 11:19 AM
    • Replies: 1
    • Views: 1,571
    06-05-2012, 05:20 PM Go to last post
  7. The differences between subdistribution hazard ratios and hazard ratios

    Hello everybody! I just wondered if someone knows what the differences is between a subdistribution hazard ratios (sHR) and the hazard ratios...

    Started by Sirikon‎, 06-04-2012 08:17 AM
    • Replies: 2
    • Views: 8,294
    06-05-2012, 06:19 AM Go to last post
  8. Elasticity with negative predictors

    Hello All: I am trying to determine elasticity of demand using relative price position (my price minus competitors price) as the predictor. I know...

    Started by brewnami‎, 05-11-2012 09:23 AM
    • Replies: 2
    • Views: 2,003
    06-04-2012, 02:00 PM Go to last post
  9. how to perform autocorrelation test in panel data analysis?

    anyobody knows how to perform autocorrelation test in panel data analysis? the choosen model is fixed effect model. please reply soon

    Started by anwarlatif‎, 06-04-2012 06:03 AM
    • Replies: 0
    • Views: 1,514
    06-04-2012, 06:03 AM Go to last post
  10. Exclamation Multiple Logistic Regression: Interpreting Insignificant Variables

    I ran a multiple regression, using the following categorical dependent variables which ranked current job satisfaction: 0=not satisfied at all...

    Started by xjuhneevuhx‎, 06-01-2012 07:47 PM
    insignificant, mlogit, stata
    • Replies: 1
    • Views: 4,735
    06-03-2012, 03:47 PM Go to last post
  11. Interpreting confidence bands on interaction terms

    Dear all, I have a model with three variables a dependent (dep), a binary independent variable (bin) and a contin. independent variable (con). I am...

    Started by Kaga84‎, 06-02-2012 11:06 AM
    confidence bands, interaction terms, standard error
    • Replies: 2
    • Views: 2,369
    06-03-2012, 04:53 AM Go to last post
  12. How are F-Values, R-Square and Adjusted R-Square calculated in Regression?

    How are F-Values, R-Square and Adjusted R-Square calculated in Regression Analysis?

    Started by Dr.Appalayya‎, 06-02-2012 10:55 PM
    • Replies: 0
    • Views: 2,178
    06-02-2012, 10:55 PM Go to last post
  13. Interpreting results: repeated measures logistic regression

    I am into some new territory with repeated measures logistic regression. The hypothesis for this study is that treatment will make more less...

    Started by trinker‎, 05-31-2012 10:19 PM
    • Replies: 7
    • Views: 3,185
    06-02-2012, 09:24 PM Go to last post
  14. Variable shared between IV and DV

    Hi all, I was reading a study recently regarding using a measure of code churn to determine whether code is going to be buggy or not. The study...

    Started by schwartzaw‎, 06-02-2012 08:55 AM
    • Replies: 3
    • Views: 2,056
    06-02-2012, 09:47 AM Go to last post
  15. multiple regression: help needed!

    hi: the scenario as follows: correlation between X1 and Y is positive and significant. when ADD X2, the correlation between X1 and Y becomes...

    Started by pmds‎, 06-01-2012 06:04 AM
    • Replies: 1
    • Views: 1,719
    06-01-2012, 06:37 AM Go to last post
  16. Interaction between dichotomous and interval scaled var

    Hi, First of all my research question: Does waiting time at a junction only depend on the traffic but also on the presence of pedestrians? DV=...

    Started by Taras Bulba‎, 06-01-2012 03:45 AM
    • Replies: 0
    • Views: 2,236
    06-01-2012, 03:45 AM Go to last post
  17. question about residual variance

    It can found that the resisual variance in linear regression model is definde as squared sum (y_i - (a*x_i+b))^2 divided by n-k where: (x_i, y_i)...

    Started by mormegil‎, 05-26-2012 01:48 PM
    • Replies: 3
    • Views: 2,410
    05-31-2012, 02:17 AM Go to last post
  18. logistic regression or log binomial regression?

    Hi all :wave: I wish to look at the association between 2 variables-age at vaccine initiation (continuous) and vaccine completion (binary). I am...

    Started by praj‎, 05-30-2012 10:05 AM
    • Replies: 0
    • Views: 3,012
    05-30-2012, 10:05 AM Go to last post
  19. Smile Understanding Prediction Limits

    Hi guys! I'm also starting with predictive analysis and regression models. I've managed to get a nice looking prediction formula with 86.8% of R2....

    Started by Rockdrigo‎, 05-28-2012 11:22 AM
    interpretation, prediction limits, regression
    • Replies: 1
    • Views: 1,972
    05-28-2012, 02:01 PM Go to last post
  20. Logistic regression with categorical IV and moderate relation...

    Hello! I have a little exercice to do for a stats class... And I need some help. (SPSS program) I have -1 dicho dependant variable -4...

    Started by TaB‎, 05-28-2012 12:26 PM
    • Replies: 0
    • Views: 1,406
    05-28-2012, 12:26 PM Go to last post
  21. Beta regression 1 and 0 values

    Hi there, I am trying to carry out beta regression but some of the realitzationsof my response varaible are 0 and 1 values and hennce I cannot...

    Started by Tomas_M‎, 05-28-2012 04:17 AM
    • Replies: 5
    • Views: 3,469
    05-28-2012, 08:47 AM Go to last post
  22. Find the regression equation

    Hi I have problem and I want you to help me This problem should use by Minitab.... In a study in collaboration with the Engineering...

    Started by evian‎, 05-28-2012 01:52 AM
    • Replies: 5
    • Views: 2,678
    05-28-2012, 08:06 AM Go to last post
  23. Interpreting Multiple Regression vs Correlation

    Hi, I'm analysing the results to a satisfaction survey. I want to work out the key drivers of satisfaction so I'm using a question relating to...

    Started by andrew2786‎, 05-23-2012 10:12 AM
    correlation, interpreting results, multiple regression, satisfaction
    • Replies: 4
    • Views: 5,200
    05-28-2012, 05:58 AM Go to last post
  24. Modeling rates, non-normal errors. Alternatives to linear regression

    Hi there, I am trying to fit a rate, that is a response variable whose range is between 0 and 100. Because this variable is both upper and...

    Started by Tomas_M‎, 05-27-2012 12:30 PM
    • Replies: 4
    • Views: 2,267
    05-27-2012, 01:15 PM Go to last post
  25. How to estimate the parameters of LSTR model?

    Hi all i try to estimate LSTR model (Logistic Smooth Transition Regression). but i can't undrestand how to estimate the parameters gamma and c...

    Started by Nour‎, 05-24-2012 05:06 AM
    • Replies: 0
    • Views: 2,036
    05-24-2012, 05:06 AM Go to last post
  26. Difference-in-differences analysis - STATA syntax for binary data

    Dear Friends, I am doing Difference-in-differences analysis with repeated cross-sectional data. I have both continuous and binary data. I found...

    Started by karen_marti‎, 05-24-2012 03:50 AM
    • Replies: 0
    • Views: 6,240
    05-24-2012, 03:50 AM Go to last post
  27. Moved: Long format for OLS?

    Started by hellonew‎, 05-23-2012 12:43 PM
    • Replies: -
    • Views: -
    05-23-2012, 12:50 PM Go to last post
  28. Is it necessary to do a t-test for a linear regression based on a census?

    I retrieved all the average yearly temperature data from years 1899-2011 (113 data points in total) and plotted them and figured a regression line. ...

    Started by lluke9‎, 05-22-2012 05:22 PM
    • Replies: 0
    • Views: 2,368
    05-22-2012, 05:22 PM Go to last post
  29. Consistency of an estimator for nonlinear regression

    Dear all, It is stated e.g. in that to prove consistency of an estimator \hat{\theta}_n it is sufficient to prove that the true value ...

    Started by Jacov‎, 05-15-2012 08:21 AM
    • Replies: 1
    • Views: 1,628
    05-21-2012, 07:44 AM Go to last post
  30. Moderated regression - differences within groups

    Hello :) In a study Iím currently analyzing I have 3 conditions (positive, negative and neutral) and 2 groups (emotional and non-emotional...

    Started by Pebbles84‎, 05-21-2012 05:47 AM
    • Replies: 0
    • Views: 1,718
    05-21-2012, 05:47 AM Go to last post
  31. non-linear regression time response model

    Hi I need to choose a non linear regression model for, protein phosphorylation over time response, for this kind of data Is not like enzyme...

    Started by friveroll‎, 05-17-2012 04:22 PM
    non-linear, regresion analysis
    • Replies: 5
    • Views: 3,413
    05-19-2012, 09:05 AM Go to last post
  32. Binary logistic regression with extremely biased response variable

    Hi, for a study to be published as a paper, I have collected data in which my binary response variable Y is highly biased towards Y=0 (it's Y=0...

    Started by Dohans‎, 05-19-2012 03:56 AM
    • Replies: 0
    • Views: 1,950
    05-19-2012, 03:56 AM Go to last post
  33. Coefficient of correlation and forcing to pass origin

    Hello! I donít understand much about statistics, so forgive me if this is a very basic question :o Iím working with linear regression, forcing...

    Started by MopsaAspom‎, 05-18-2012 10:00 AM
    • Replies: 4
    • Views: 3,896
    05-18-2012, 11:26 AM Go to last post
  34. How to interpret interactions bt categorical and continous variables?

    Hi there, I am struggling with the above problem. I have a dummy variable with 3 categories (total categories=4 so 1 reference category) and a...

    Started by SylviaS‎, 05-15-2012 01:12 PM
    • Replies: 3
    • Views: 2,272
    05-18-2012, 09:06 AM Go to last post
  35. Regression Analysis Between Two Independent Variables

    Hi, I was hoping you may be able to help me. I'm a uni student writing a dissertation but I think I have bitten off more than I can chew regarding...

    Started by galisgos‎, 05-18-2012 08:59 AM
    • Replies: 0
    • Views: 1,176
    05-18-2012, 08:59 AM Go to last post
  36. Entering predictors sequentially for multinomial logit?

    Hello, I have a set of data with a 3-level outcome variable and multiple predictor variables; I am testing a hypothesis about whether a certain...

    Started by ganajr‎, 05-09-2012 11:02 PM
    logistic regression, multinomial regression
    • Replies: 2
    • Views: 2,520
    05-17-2012, 11:12 AM Go to last post
  37. Help - coefficients have wrong signs!

    Hi guys I'm a struggling with an econometric model. I am trying to predict tenant demand for office space based on a selection of 5 lagged...

    Started by Pete‎, 05-13-2012 11:21 PM
    • Replies: 6
    • Views: 2,152
    05-17-2012, 10:36 AM Go to last post
  38. question about interactions

    Hi All, I have intercation terms between a categorical variable and a continous variable. Does it make sense to include on one intercation term...

    Started by SylviaS‎, 05-16-2012 09:15 AM
    • Replies: 3
    • Views: 2,187
    05-16-2012, 12:29 PM Go to last post
  39. how to find mistakes in the multiple regression study

    Hello everyone, I'm working on eye-tracking papers related to reading. I'm currently studying this paper...

    Started by Christine‎, 05-14-2012 09:36 AM
    • Replies: 1
    • Views: 1,904
    05-14-2012, 09:51 AM Go to last post
  40. Regression analysis of more than two independent and dependent variables

    Hello, I want to find the relationship between independent and dependent variables using regression analysis. There are 5 IV and 4 DV. Please...

    Started by ashima‎, 04-11-2012 07:20 AM
    • Replies: 8
    • Views: 5,449
    05-14-2012, 09:50 AM Go to last post
  41. GLMM random effect conceptualization

    Hello, I have a general question concerning GLMM. I would like to model animal counts as a function of characteristics of the sampling location and...

    Started by filups21‎, 05-14-2012 08:13 AM
    glmm
    • Replies: 0
    • Views: 1,653
    05-14-2012, 08:13 AM Go to last post
  42. Regression with two categorical predictors and 1 control/covariate?

    Hello, I'm in need of help as these analyses I describe are for my thesis so any input would be greatly appreciated. By the way, I am using IBM...

    Started by acer539‎, 05-13-2012 02:57 PM
    • Replies: 1
    • Views: 2,391
    05-14-2012, 03:04 AM Go to last post
  43. Calculating Cook's Critical Value

    Hey can someone show me how to get F (4,15) (0.5) = 0.8783.

    Started by saternal‎, 05-12-2012 12:43 AM
    • Replies: 7
    • Views: 5,264
    05-12-2012, 01:37 PM Go to last post
  44. find variance of prediction errors for an AR(2) process

    Hi I have attached my question due to my lack of familiarity with latex at the moment. I need to find the variance of the prediction errors,...

    Started by cjones‎, 05-11-2012 05:58 PM
    • Replies: 0
    • Views: 4,584
    05-11-2012, 05:58 PM Go to last post
  45. Insignificant coefficient in one model becomes significant in another model--???

    Aloha, A multiple regression finding is puzzling my adviser and I. Overall goal--to see if caregiver status (dummy, 0/1) and job variables...

    Started by ljcs‎, 04-27-2012 06:26 PM
    • Replies: 3
    • Views: 9,952
    05-10-2012, 07:21 PM Go to last post
  46. Linear R^2 Values as Percent Weights for Multiple Variable Formula?

    Hey guys, Statistics is not my strong suit.. The closest I've been to statistics is a college level Biology II class I took three years ago.. But...

    Started by 7rashcan‎, 05-07-2012 05:20 PM
    multiple regression, percent, r squared, r^2, weights
    • Replies: 1
    • Views: 2,631
    05-10-2012, 06:12 PM Go to last post
  47. Beginner's Question

    Given that you have all the data you need in excel, how fast does it take to derive the equation of the line with it's r2 value? lets say you use...

    Started by webstood‎, 05-10-2012 06:07 PM
    • Replies: 0
    • Views: 1,368
    05-10-2012, 06:07 PM Go to last post
  48. Significant Correlation, Insignificant Regression

    Dear All, I have a highly significant correlation between two variables (A and B). When using a OLS method, however, the relationship between the...

    Started by TimoV‎, 05-09-2012 01:50 AM
    • Replies: 1
    • Views: 3,686
    05-10-2012, 06:06 PM Go to last post
  49. What tools can we use to solve LR equations to get unknown parameter vector?

    Greetings, Apologies if my explanations are unclear, I am new to data mining coming from business intelligence development area. Let's say we...

    Started by olap‎, 05-10-2012 08:51 AM
    data mining, linear regression, parameter vector
    • Replies: 4
    • Views: 1,844
    05-10-2012, 01:16 PM Go to last post
  50. Squared semi partial correlations

    Hi I have been developing multiple regression models with 2 predictors. The two predictors are slightly correlated and therefore I am wanting to...

    Started by Lisa20‎, 03-31-2012 02:15 AM
    • Replies: 2
    • Views: 2,709
    05-08-2012, 06:53 AM Go to last post
  51. Regression Analysis on cluster of data

    I'm currently a student trying to analyze the relation between the cost of marketing and it's observed returns on those costs. obviously, the...

    Started by webstood‎, 05-06-2012 12:15 PM
    • Replies: 3
    • Views: 2,188
    05-06-2012, 04:09 PM Go to last post
  52. cut-off point for binary logistic regression without ROC curve

    Hi! I just want to know how to find a relatively good cut-off point for binary logistic regression model. I haven't learnt anything on ROC curve. Is...

    Started by xiaochen‎, 05-06-2012 11:29 AM
    cut-point, logistic regression
    • Replies: 0
    • Views: 5,888
    05-06-2012, 11:29 AM Go to last post
  53. which model to use ?

    Hello I have a problem choosing the right model for my data. My response variable is time to event in minutes, when a lower value is better...

    Started by Yankel‎, 05-03-2012 05:55 AM
    • Replies: 3
    • Views: 2,218
    05-04-2012, 02:02 PM Go to last post
  54. Alternatives to Poisson regression for overdispersed count data

    Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

    Started by forscher‎, 05-04-2012 11:20 AM
    count data, poisson mean/variance, poisson regression
    • Replies: 6
    • Views: 2,412
    05-04-2012, 11:52 AM Go to last post
  55. relative risk ratios and standard errors

    Hey forum, Odds ratios or relative risk ratios are calculated by exponentiating the coefficients (from a binary or multinomial logit model),...

    Started by cureeous‎, 05-04-2012 12:16 AM
    • Replies: 2
    • Views: 2,874
    05-04-2012, 08:17 AM Go to last post
  56. Timeseries: sig. Ljung-box Q, but residuals normally distributed

    Hi all, Hope someone can help me with the following problem/question I encounter. I'm working with a monthly time-serie consisting of 36 data...

    Started by Eyecatcher‎, 05-03-2012 11:02 AM
    exponential smoothing, ljung-box q, timeseries
    • Replies: 4
    • Views: 7,622
    05-03-2012, 12:15 PM Go to last post
  57. Logistic Regression

    I have a sample of 500 older kids and we want to investigate what factors are related to the probability that they will bully. Groups: kids were...

    Started by glenlivet12‎, 05-02-2012 08:48 AM
    • Replies: 3
    • Views: 2,237
    05-02-2012, 09:09 AM Go to last post
  58. Observation limitation

    I am currently doing my dissertation on how China's economic growth contributes to Hong Kong's income inequality after 1997. However, there are only...

    Started by jkw10‎, 05-02-2012 08:31 AM
    • Replies: 0
    • Views: 1,763
    05-02-2012, 08:31 AM Go to last post
  59. multiple regression and mediators

    Hi I have 10 independent variables and 1 dependent variable. Of the 10 i have selected 4 variables as my predictors for my multiple regression. I...

    Started by eleanor_rigby‎, 05-01-2012 06:52 AM
    • Replies: 4
    • Views: 3,945
    05-02-2012, 05:57 AM Go to last post
  60. Predictors in Logistic regression, SPSS

    Hello. I have the problem I canít deal with. Maybe you can help me? You see, I have 2 samples in retrospective cohort study Ė cases (include 29...

    Started by julbeam‎, 05-01-2012 03:53 AM
    logistic regression, predictor, spss
    • Replies: 3
    • Views: 3,340
    05-01-2012, 02:08 PM Go to last post

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