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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...

• Replies: 0
• Views: 1,595
03-04-2014, 02:46 PM
2. ### 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...

• Replies: 3
• Views: 2,226
05-30-2014, 05:38 AM
3. ### 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...

• Replies: 2
• Views: 1,841
02-27-2015, 08:55 PM
4. ### 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...

• Replies: 0
• Views: 2,415
02-18-2013, 10:59 AM
5. ### 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...

• Replies: 6
• Views: 1,776
08-17-2012, 10:08 AM
6. ### Dependent variable kurtosis

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

• Replies: 2
• Views: 3,363
05-03-2009, 06:01 PM
7. ### 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....

• Replies: 2
• Views: 576
04-17-2017, 10:32 PM
8. ### 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...

• Replies: 3
• Views: 1,633
09-16-2012, 12:34 AM
9. ### 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...

• Replies: 4
• Views: 2,301
12-28-2013, 12:36 PM
10. ### 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.

• Replies: 1
• Views: 2,128
03-29-2012, 12:05 PM
11. ### 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 /...

• Replies: 1
• Views: 2,486
07-15-2014, 06:35 PM
12. ### Deriving further values from regression coefficients

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

• Replies: 0
• Views: 1,839
01-19-2017, 09:43 AM
13. ### 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...

• Replies: 2
• Views: 1,602
10-05-2012, 10:03 AM
14. ### [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...

• Replies: 8
• Views: 1,939
03-18-2014, 08:05 PM
15. ### 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...

• Replies: 4
• Views: 8,402
09-19-2010, 01:11 PM
16. ### 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...

• Replies: 2
• Views: 1,283
02-13-2015, 04:23 AM
17. ### 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...

• Replies: 2
• Views: 1,772
05-23-2011, 07:02 AM
18. ### 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...

• Replies: 4
• Views: 3,474
01-20-2011, 11:17 AM
19. ### 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...

• Replies: 0
• Views: 1,839
12-19-2011, 02:46 PM
20. ### 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...

• Replies: 0
• Views: 1,046
06-09-2016, 03:13 AM
21. ### 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...

• Replies: 1
• Views: 970
12-31-2013, 02:45 PM
22. ### 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...

• Replies: 1
• Views: 222
08-11-2017, 02:04 PM
23. ### 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...

• Replies: 12
• Views: 2,019
07-15-2014, 06:52 AM
24. ### 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...

• Replies: 1
• Views: 1,364
06-22-2014, 01:12 AM
25. ### 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...

• Replies: 0
• Views: 2,202
10-25-2010, 05:39 PM
26. ### 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...

• Replies: 1
• Views: 1,676
08-03-2016, 09:50 PM
27. ### 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...

• Replies: 0
• Views: 1,467
05-10-2015, 08:55 PM
28. ### 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...

• Replies: 3
• Views: 1,451
08-03-2016, 01:46 PM
29. ### 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: ...

• Replies: 4
• Views: 1,260
06-29-2015, 07:06 AM
30. ### 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...

• Replies: 0
• Views: 3,146
03-26-2012, 06:20 PM
31. ### 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...

• Replies: 1
• Views: 7,955
02-24-2011, 11:20 AM
32. ### 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...

• Replies: 2
• Views: 2,896
11-28-2010, 06:32 PM
33. ### 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

• Replies: 3
• Views: 2,183
07-29-2011, 11:24 AM
34. ### 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...

• Replies: 1
• Views: 1,581
03-27-2014, 03:50 PM
35. ### 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...

• Replies: 0
• Views: 747
05-26-2017, 09:39 PM
36. ### 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...

• Replies: 0
• Views: 1,625
06-28-2013, 04:36 AM
37. ### 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...

• Replies: 0
• Views: 3,278
06-23-2014, 08:43 AM
38. ### 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...

• Replies: 2
• Views: 1,401
07-02-2014, 05:46 AM
39. ### 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...

• Replies: 2
• Views: 1,677
07-03-2013, 01:03 PM
40. ### 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,...

• Replies: 0
• Views: 3,191
12-13-2010, 07:01 AM
41. ### 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...

• Replies: 4
• Views: 1,877
01-29-2013, 12:50 PM
42. ### 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...

• Replies: 5
• Views: 3,034
06-15-2009, 07:01 PM
43. ### 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...

• Replies: 2
• Views: 21,379
11-30-2008, 09:08 PM
44. ### 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...

• Replies: 7
• Views: 3,750
05-05-2011, 05:05 PM
45. ### 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...

• Replies: 4
• Views: 3,420
01-27-2012, 01:54 PM
46. ### 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...

• Replies: 0
• Views: 2,085
08-02-2016, 09:55 PM
47. ### 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...

• Replies: 1
• Views: 1,271
03-13-2015, 08:18 AM
48. ### 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...

• Replies: 0
• Views: 1,123
05-01-2012, 12:35 PM
49. ### 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...

• Replies: 1
• Views: 1,779
01-29-2014, 09:53 PM
50. ### 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...

• Replies: 0
• Views: 891
01-31-2014, 10:28 AM
51. ### 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...

• Replies: 3
• Views: 3,850
04-24-2013, 06:10 PM
52. ### 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...

• Replies: 0
• Views: 927
04-03-2014, 04:43 AM
53. ### 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...

• Replies: 0
• Views: 1,219
ERa
08-16-2015, 01:46 AM
54. ### 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...

• Replies: 0
• Views: 2,068
10-31-2013, 04:49 PM

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