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Questions tagged [checking]

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Checking of Measurement in Grouped Data

My teacher uses the formula below when looking for the median and mode of a grouped data. $$ median = L_m + c\frac{\frac{n}{2} - F_{m-1}}{f_m} \\ mode = L_m +c\frac{f_m - f_{m-1}}{2f_m-f_{m-1}-f_{m+1}...
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1answer
65 views

Naive bayes computation of denominator

I'm wondering about the denominator in this computation : ...
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0answers
42 views

How to check the assumption of homogeneity of variance visually using box-plots

Can anyone confirm if APA no longer recommends using statistical tests for checking assumptions? If so, what are the alternatives? I have been told to check visually but I am unsure how to check ...
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2answers
112 views

Using statistics to check plausibility

I saw what seemed to be a crazy claim, that a certain parameter was small. I found a list of studies on the relevant subject and picked the one which appeared to measure the smallest value for that ...
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0answers
32 views

How to interpret a simple indirect effect obtained from two separate regressions

I have a simple question to check my math. Consider a logistic regression, Model 1, which I'll discuss in terms of probabilities rather than logits to make things simpler. All variables are binary ...
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1answer
57 views

Concerns about data for regression model

I'm building a model that predicts goals scored based on the defenses that a player faces. From the classes I've taken, you should normalize the response variable. Here is the issue I'm facing: the ...
4
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1answer
2k views

What is posterior predictive check, and how I can do that in R?

I am using Bayesian hierarchical modeling to predict an ordered categorical variable from a metric variable. For example, I want to regress Happiness (in 1-5 ratings) on Money (a metric variable): ...
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0answers
139 views

Model checking versus posterior predictive checks

I am interested in knowing if there are any difference in modeling checking versus posterior predictive checks in the Bayesian framework. Are posterior predictive checks a type of model checking?
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1answer
927 views

Is the linear probability model generalisable to ordered logit/probit regressions?

I have a set of data where the dependent variable is an ordered response with 7 levels and I've fitted an ordered logit model to the data, and now I want to conduct some robustness checks on the ...
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1answer
8k views

Most efficient way to check answers to exercises when learning from a statistics textbook?

There's a community wiki at: Free statistical textbooks that has a nice list of freely available textbooks on statistics. Many of the textbooks that people suggest have exercises at the end of each ...
4
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1answer
147 views

numerical measure for an ordered list

At the end of every semester I have to input my students' grades into a database. Typically this means I go one by one down my list of grades from my excel spreadsheet and manually fill the grade into ...
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1answer
394 views

Does a strong checksum provide reasonable assurance of absolute data integrity?

Does a checksum ensure absolute data integrity? That is, if a piece of data several gigabytes long changes a single bit, the odds are dependable that the checksum will be different, particularly with ...
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3answers
125 views

How to check a similar question in a survey

I have a survey in which I asked, "Would you be ready for a t-shirt shop in St Jean Avenue? [yes/no/don't know]". Then I asked many other questions, ultimately including, "Would you be ready for a t-...
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1answer
1k views

What is a good academic citation for cross-validation?

I performed a holdout cross-validation analysis on a multilevel model fit. The purpose of this was to show that we didn't have a problem with over-fitting, for which it worked just fine. Now we are ...
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0answers
94 views

What are some quick initial tests to check the quality of a new dataset? [duplicate]

Possible Duplicate: Essential data checking tests When you are presented with a dataset, what are some quick things you can look for to get a feel of how 'good' the dataset is. ('Good' in the ...
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2answers
8k views

How to find duplicate cases in a large dataset?

I have a large dataset which is made up of responses from 600 shoppers on 15 variables. When I tally the responses, it comes to 603. I know there were 600 respondents, so I must have recorded the ...
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2answers
2k views

How to calculate derivative of the contractive auto-encoder regularization term?

Setup I found a paper on that has a varient on normal auto-encoders (contractive) which for its gradient uses the following regularization penalty: $$\left|\left|J_f(x)\right|\right|^2_F = \sum_{ij}...
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6answers
7k views

Essential data checking tests

In my job role I often work with other people's datasets, non-experts bring me clinical data and I help them to summarise it and perform statistical tests. The problem I am having is that the ...