Linked Questions

4
votes
2answers
643 views

Why my residual-fitted plot looks like this? [duplicate]

I'm using a glm poisson regression in R, and I did a model diagnostics after my model fitting, but the residual distribution is so wierd.
0
votes
0answers
908 views

Testing the goodness of fit for a Poisson model [duplicate]

I need help in calculating the goodness of fit for a Poisson model. The online literature on it is quite scarce, so if you have any useful articles and links I would appreciate it very much. Here is ...
19
votes
4answers
18k views

How to assess the fit of a binomial GLMM fitted with lme4 (> 1.0)?

I have a GLMM with a binomial distribution and a logit link function and I have the feeling that an important aspect of the data is not well represented in the model. To test this, I would like to ...
13
votes
2answers
694 views

Is there any statistical reason for diagonal lines in scatterplot on a log scale? [duplicate]

I'm perplexed by some vertical lines that show up in these scatter plots on a log scale. Population is on the y-axis and the proportion of the neighborhood with the attribute mentioned in the panel ...
8
votes
3answers
1k views

How should I interpret this residual plot?

I am unable to interpret this graph. My dependent variable is total number of movie tickets that will be sold for a show. The independent variables are the number of days left before the show, ...
3
votes
1answer
2k views

Diagonal lines in residuals vs fitted values plot for ANOVA

I'm experiencing strange patterns of residuals. The following chart is a scatterplot of Standard residuals (Sres) versus Fits. I'm interested in the diagonal lines that mean that a higher fit leads to ...
1
vote
1answer
2k views

decreasing trend in residual plot for linear regression

I am fitting a linear model with one dependent variable and 5 independent variables. All variables are continuous. The residual plot (plot of residuals vs. predicted values) appears to have a ...
0
votes
2answers
506 views

Analyzing bad lm plots in R (Two parallel lines in Residuals and Normal QQ)

I am working on some stock analysis that I picked up to help me learn more about modeling. I have become comfortable analyzing these plots when they are more as expected but I can't figure out why ...
0
votes
0answers
1k views

What causes bands/stripes in residual plots?

I ran a model and got the following residuals: I proceeded to log the fitted values to get an idea of what's happening at the lower end of my predicted values: It was then I saw on the left side ...
2
votes
1answer
575 views

Interpret this observed-vs-fitted plot

I have this OvF plot with the outcome being a ln-transformed continuous variable (length of stay in days). This plot is the result of a survey-adjusted weighted mixed-level (1 level random intercept),...
0
votes
0answers
888 views

Strong pattern on residual plot (simple linear regression in R) [duplicate]

I am a novice in R, and fitting a linear model with lm(). Here is a summary of my linear model. Here are some assumption checking plots The normal histogram and qqplot looks okay to me, but there ...
2
votes
1answer
411 views

Help Interpreting Residuals vs Fit Graph (multiple regression) [duplicate]

Can anyone advise how to interpret this resulting residuals vs fitted graph and what may be wrong with the model?
0
votes
0answers
283 views

Residual plot for simple linear regression

I'm trying to analyze a part of European Social Survey data. The outcome has to be treated as continuous, however it can take only discrete values from 1 to 6. The predictor variable is age. I fitted ...
1
vote
1answer
115 views

Residuals still zero inflated after running zero-inflated poisson mixed effect model with glmmTMB

I am working with observational data which has a right skew in the dependent variable. This is a mixed effect model with a poisson distribution as based on discrete data. After finding the residuals ...
1
vote
0answers
123 views

Why is it unacceptable to use binary or count dependent variables in OLS?

I know this is a basic question but I really want to make sure I fully understand the reason's why this is the case. If possible, can someone help explain to me as simply as possible why it is bad to ...

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