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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Analysis of promotional data by department

Hi all, I have recently started an internship with a major UK retailer. My project is to come up with a model (and analysis) for promotions that...

• Replies: 6
• Views: 1,191
07-15-2013, 08:38 AM
2. ### Analytical linear regression?

My lecturer stated that no method exists to determine the line of best fit for a set of data analytically. He went on to state that computers through...

• Replies: 6
• Views: 5,261
08-05-2011, 06:01 PM
3. ### Analytical solution to correlation between two linear combinations of values

Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

• Replies: 3
• Views: 1,741
09-12-2014, 02:00 PM
4. ### analyzing residual plot by hand

Hi! Thanks in advance for looking at my query. I have a very basic question regarding regression. We have to analyze a residual Plot by hand. We...

• Replies: 1
• Views: 7,812
12-06-2010, 07:54 PM
5. ### Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags”...

• Replies: 1
• Views: 606
06-02-2017, 12:10 AM
6. ### Ancova

Hello, I'm trying to compare regression models of the same form between three groups. Each model has two continuous independent variables. I need...

• Replies: 0
• Views: 2,152
04-17-2007, 09:23 AM
7. ### ANCOVA - can I delete a very significant variable from a model's equation?

Hi all, I undertook a sensitivity analysis to study the contribution of explanatory variables to soil organic carbon variations. Here, the...

• Replies: 5
• Views: 1,191
11-24-2015, 07:30 AM
8. ### ANCOVA and geography help

For a GIS class project, I'm doing some research based on Christopher Rumh's 2000 paper Are Recessions Good for your Health? In it, he analyzes...

• Replies: 1
• Views: 2,366
11-03-2011, 03:09 AM
9. ### ANCOVA coding of categorical covariates

Hello all, I am running an ANCOVA in R (Anova function) to assess the results of a randomized experimental study. I have a 2x2 full factorial...

• Replies: 0
• Views: 928
01-28-2016, 05:57 PM
10. ### ANCOVA controversy?

Hello all, I have a question regarding ANCOVA, which seems straightforward, however an answer has eluded me. The question is: Can a...

• Replies: 3
• Views: 12,044
11-03-2009, 08:30 PM
11. ### ANCOVA with 4 IV's and 1 DV. Which IV is the moderator?

Hi! My experiment is a Between-subjects factorial design. I used two scenario's. I want to perform a factorial ANOVA analysis with 4 IV's and 1...

• Replies: 0
• Views: 1,924
09-27-2012, 04:29 AM
12. ### Anomoly detection using regression

Hi There, X1 X2 and X3 are three observations made on a system. All three variables are the response of the system and it is seen theoretically...

• Replies: 0
• Views: 1,860
05-16-2011, 06:58 PM
13. ### Another question about regression

First, thank you to John and Quark for responding to my question about multiple regression!!!! I have another question. I am using SPSS and...

• Replies: 1
• Views: 3,675
11-20-2005, 12:25 PM
14. ### Another question re: correlation and regression

I seem to be getting confused between correlation and regression a bit... I'm trying to identify the relationship between a series of X variables...

• Replies: 3
• Views: 2,465
03-20-2008, 11:38 AM
15. ### ANOVA - Does Welch's test assume homogeneity of variances, or not?

In other words, will it return a much smaller standard error when variance are unequal than Fisher's? Or is it not concerned with variance?

• Replies: 3
• Views: 2,495
12-28-2016, 09:46 PM

Hello, I was wondering if you could please offer any advice as I appear to have got rather muddled. I am writing a resesarch proposal, and I...

• Replies: 8
• Views: 2,883
12-10-2008, 11:14 PM
17. ### Anova find significant diferrences

Hi all, I have made an one-way anova in order to test if three populations have the same means. My result is to reject the null hypothesis. So,...

• Replies: 4
• Views: 1,331
03-30-2016, 01:17 AM
18. ### ANOVA multi-variable problem

If there is a dependent variable depending on 5 independent variables or factors, how to find the relative effect of these 5 groups on dependent...

• Replies: 3
• Views: 1,953
12-26-2015, 09:40 PM

1.A study has been conducted to determine whether the mean spending for recreational activities during the month of August differs for residents of...

• Replies: 0
• Views: 3,664
04-23-2007, 12:20 AM
20. ### ANOVA REML AND REGRESSION - When to use

Dear All I am trying to get my head around when to use ANOVA when to use regeression and when to use REML. As I understand REML can be used in...

• Replies: 1
• Views: 3,053
06-29-2012, 12:24 PM
21. ### anova repeated measures with interaction term

i hva been sitting here for 6 hours trying to figure out what i am doing wrong, but i cant figure it out. I am doing anova with repeated measures....

• Replies: 0
• Views: 1,055
02-12-2016, 07:57 AM
22. ### ANOVA table insignificant in Regression

Greetings!!! Regression analysis produced ANOVA table insignificant. Please confirm if I should report regression results. Thanks Rayyan

• Replies: 6
• Views: 12,879
09-23-2010, 04:43 PM
23. ### ANOVA with multiple imputed Data

Hello :) I used multiple imputation on my data to get a complete data set. I want to do a ANOVA now. Does anybody know how to do that correctly? ...

• Replies: 23
• Views: 967
09-15-2017, 04:15 AM
24. ### Anova/Linear regression

I have two datasets, one collected by one instrument, say A, and one by another, say B, at the same time. I need to use instrument B to calibrate...

• Replies: 0
• Views: 1,804
01-30-2017, 05:45 AM
25. ### ANOVA/MANOVA for a complex data matrix

Hi friends, I've got a data matrix with 140 rows and 5 columns. Each row represents a unique characteristic of the 5 different plant species. Idea...

• Replies: 4
• Views: 2,063
08-21-2013, 02:20 AM
26. ### Any data transformation needed for Pearson and Multiple regression?

I want to run a Pearson's r and also multiple regresssion between a DV and some IVs. The DV is measured in percentages as well as some of my IVs. The...

• Replies: 0
• Views: 2,859
04-19-2010, 01:14 PM
27. ### Any good online lectures of time series introduction?

Hello all: I'm looking to find "good" online videos that provide an introduction to time series analysis (some of the basics, applications....). ...

• Replies: 1
• Views: 4,036
08-05-2013, 01:50 PM
28. ### Any software to get sample size/power analysis for probit regression?

Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

• Replies: 12
• Views: 7,942
09-19-2011, 12:06 PM
29. ### Anyone familiar with this statistical paradox?

I have discovered an interesting statistical paradox. If you familiar with it, please, let me know about its conventional name (or author's name) and...

• Replies: 0
• Views: 1,234
01-20-2015, 04:25 AM
30. ### Apples-to-apples needs same trend fn form between cases?

Hi A rather conceptual question, if someone could perhaps illuminate: I am investigating possible correlation between an independent and...

• Replies: 0
• Views: 2,201
08-10-2010, 05:00 AM

Hi all, for my master thesis I would like to investigate the human impact on behavior of sea lions. I have 3 different defined response variables...

• Replies: 10
• Views: 3,124
11-22-2011, 02:03 PM
32. ### Applied linear regression model

any one can tell me the "real life application of linear model" with example ????

• Replies: 0
• Views: 1,436
12-01-2013, 07:59 AM
33. ### 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...

• Replies: 0
• Views: 1,501
08-29-2012, 09:41 PM
34. ### Applying multiple regression results to new data SPSS

My study involves testing infants at multiple time points using a number of behavioural tests. I used a multiple regression to establish which...

• Replies: 3
• Views: 1,983
12-06-2015, 04:17 AM
35. ### Applying SEM model to mutually exclusive smaller datasets

Hello, I have an SEM model I am happy with and I am examining the standardized path coefficients. Then when I split the original data set into...

• Replies: 2
• Views: 2,197
06-04-2011, 11:48 PM
36. ### Approaches for multivariate nonlinear parametric regression?

I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a...

• Replies: 1
• Views: 1,138
03-24-2015, 06:45 PM
37. ### Appropriate Coding of DV in logistic regression

Good morning! I have the following problem with a logistic regression that relates German graduates' attributes (subject, univerity type, degree,...

• Replies: 2
• Views: 3,537
08-30-2011, 02:43 AM
38. ### Appropriate logistic regression model to control for confounders?

I am working with a cross-sectional study sample (N=601). The goal of my research is to investigate if there is an association between a disease (X)...

• Replies: 2
• Views: 9,804
02-18-2011, 05:20 PM
39. ### Appropriate MANCOVA interaction graph

Hi all, I was hoping to get some help with how best to graph my MANCOVA interaction. I know performing this with univariate data (ANCOVA) is...

• Replies: 0
• Views: 1,471
11-14-2013, 10:38 PM
40. ### Appropriate model for (repeated) data

I have some cross-sectional data, where I'm interested in estimating a relationship between the "number of items in use" in sector i of country j and...

• Replies: 0
• Views: 1,434
08-01-2014, 07:58 PM
41. ### Appropriate null hypothesis for a two-stage regression

Hi – thanks everyone for your help in advance. I’m working on a two-stage regression, in which a coefficient from the first regression is used as an...

• Replies: 0
• Views: 1,395
04-23-2012, 08:25 AM
42. ### Appropriate regression for dependent count data and independent "not count data"

Hello, My independent data are continuous variables. My dependent variable is count data. I want to use regression to look for a relationship. ...

• Replies: 2
• Views: 4,109
06-07-2011, 02:32 PM
43. ### Appropriate Regression Method?

Hi guys, I'm relatively new to statistics, and I'm searching for an answer as to which regression method would be most appropriate for the problem...

• Replies: 4
• Views: 1,990
01-07-2015, 06:39 PM
44. ### Appropriate Statistical Method :: Nonlinear Dynamic System Identification

Hey, I should probably mention beforehand, that I am relatively new to statistics. My problem is the following: I am doing nonlinear dynamic...

• Replies: 0
• Views: 1,592
08-06-2011, 08:31 AM
45. ### Appropriate Statistical Test

just wondering what kind of test of statistical test i could do to test this: The data i have are all continuous variables (Coral Size (cm^2), Fish...

• Replies: 3
• Views: 2,409
07-22-2013, 01:23 PM
46. ### 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...

• Replies: 5
• Views: 2,412
09-01-2012, 10:54 AM
47. ### Appropriateness of semi-partial correlation squared when there are 10 predictors?

Hi all, I'm conducting multiple regression with a regression model consisting of 10 predictors (4 of which are key study variables, the remainder...

• Replies: 0
• Views: 1,156
10-10-2014, 12:39 AM
48. ### Approximating the probability of an event occuring from the output of a Poisson GLM

Hi all, I have some data that includes the output of a Poisson Log Link model, that aims to predict how many times an event will occur over the...

• Replies: 2
• Views: 1,570
10-10-2016, 11:15 AM
49. ### 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...

• Replies: 9
• Views: 2,202
09-05-2012, 06:17 PM
50. ### Are there model specification tests for Two Stage Least Squares (2SLS)?

Question. Are there model specification tests for Two Stage Least Squares (2SLS)? I am trying to estimate the parameters (B1, B2, B3) of the...

• Replies: 0
• Views: 1,322
08-21-2014, 01:23 AM
51. ### Are these models nested?

I have three logistic regression models. Model 1 is the reference model with covariates GA + BW. Model 2 is a quadratic model with GA + BW +...

• Replies: 9
• Views: 3,710
11-11-2012, 04:37 PM
52. ### 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...

• Replies: 0
• Views: 2,100
09-03-2012, 11:58 AM
53. ### ARIMA estimation technique

Hello, I am using SAS to forecast with ARIMA. I need to choose between two methods, conditional least Squares and MLE. Which technique do you...

• Replies: 8
• Views: 2,079
05-13-2017, 01:03 PM
54. ### ARIMA Modelling

I'm performing some ARIMA modelling on time series data for UK energy consumption for my dissertation at university. At a bit of a loss though. So...

• Replies: 10
• Views: 2,448
12-17-2013, 09:47 AM
55. ### 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...

• Replies: 2
• Views: 1,728
09-10-2012, 03:53 AM

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