The validation tag has no wiki summary.
2
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0answers
83 views
Validation of data partitioning
I've some numerical sequence of data monitored over time $v(i)$, which belongs to one of two classes, 0 or 1. I monitor the variable several times, obtaining a sequence associated to 0 or 1.
I use ...
14
votes
4answers
8k views
What is the difference between test set and validation set?
I found this confusing when I use the neural network toolbox in Matlab.
It divided the raw data set into three parts:
training set
validation set
test set
I notice in many training or learning ...
4
votes
1answer
263 views
Compare modeled (fitted) paired data to actual data in forecasting problem (Excel sheet included)
In my endeavor to learn forecasting and improve my statistical knowledge, I've decided to forecast the population of a certain area. I've attached the excel file that I used. I know I'm using excel ...
1
vote
1answer
92 views
Difference between Step validation and Cross validation
I'm trying to model some chemical data from a series of spectra. I've gone through the preprocessing step and selected "autoscale" (I'm using Pirouette). And when it comes to validation I'm a little ...
1
vote
1answer
289 views
Why are most standard goodness of fit tests based only on continuous distributions?
I tried to search info regarding this fact but I don't really understand why most of the standard goodness of fit tests (e.g. Kolmogorov-Smirnov, Anderson-Darling, a part of the Chi-square test, ...
4
votes
1answer
673 views
Best practices for measuring and avoiding overfitting?
I am developing automated trading systems for the stock market. The big challenge has been overfitting. Can your recommend some resources describing methods for measuring and avoiding overfitting?
I ...
1
vote
1answer
243 views
Validating a predicted standard deviation
I would like to validate the standard deviation which a model reports, because I think it is underestimated, because in the procedure some model selection is involved.
After running the model on a ...
19
votes
4answers
418 views
As a reviewer, can I justify requesting data and code be made available even if the journal does not?
As science must be reproducible, by definition, there is increasing recognition that data and code are an essential component of the reproduciblity, as discussed by the Yale Roundtable for data and ...
2
votes
1answer
590 views
Weight variables for predictive model
I received a question today that I wasn't exactly sure how to answer.
I have built a predictive model using a fairly basic logistic regression that works pretty well and fits our business needs. ...
1
vote
1answer
501 views
How to plot AIC values when using the leaps package?
Does anybody know how to plot all AIC values for different size models, when using the command regsubsets from the package ...
3
votes
1answer
504 views
How to choose training and test sets
I would like to propose a single model (decision tree), that is very variable, and validate it. I have choosen parameters after I had obtained good quality measures with a cross-validation.
I could ...
4
votes
2answers
804 views
Variance explained of a mixed effects model in a new data set
I'm using the following function to calculate Edwards R^2 (formula 19 in Edwards et al. 2008) of a mixed effects model (I hope the implementation is correct):
...
2
votes
1answer
175 views
Validating a paper questionnaire in a web-based format
I would like to validate a commonly used questionnaire for internet-based administration. What statistical tests should I be using?
1
vote
0answers
140 views
Minimal number of samples/conversions for statistical validity
We are measuring conversion rates (% of visitors who bought) on an e-commerce site.
The test apply to a segment of visitors who meet specific criteria (for example people from a certain country).
...
5
votes
2answers
3k views
How to make representative sample set from a large overall dataset?
What are the statistical techniques to create a sample set, which is representative of the entire population (with a known confidence level)?
Also,
How to validate, if the sample fits the overall ...
2
votes
2answers
951 views
What is a consistency check?
I was asked such a question as "Did you do any consistency check in your daily work?" during a phone interview for a Biostatistician position. I don't know what to answer. Any information is ...
2
votes
1answer
174 views
What resources/methods exist for testing/validation or evaluation of Statistical Methods
I'm interested in the process of testing or validating a particular implementation of a statistical method, and what datasets and/or published analysis exist that could be used to do this in practice.
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