# Questions tagged [mean]

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### IoU when labels are different

The IoU focuses only on the bounding boxes. My predictions for one Image are (Yolo) e.g. label x y w h 0 0.1 0.2 0.3 0.3 1 0.9 0.9 0.05 0.05 And my ground truth is: label x y w h 1 0.1 0.2 0.3 0....
19 views

### Combination of groupby and mean methods

I am looking at the below csv file : We have the question : Display the mean of the variable gre by group of admitted/not admitted students, using the combination of groupby and mean methods. I would ...
140 views

### What should the target variable (y) look like here?

I am doing some data science problems for practice, and this is the question I'm currently tackling: Given a list of L values generated independently by some unknown process, we will use the mean of L ...
103 views

### Why mean and median are similar for well distributed dataset?

I've read that when considering well distributed variables, median and mean tend to be similar, but can't figure out why mathematically this is the case.
34 views

### Sampling a data based on average and variance of another data

I have a set of textual datasets that have the following average and variance tokens lengths: ...
32 views

### Compare standard deviations in different samples?

I have some data which you can group based on different variables. I know how to test if they have significantly different means. But what the deviation inside the samples?
272 views

### Find variance from 2 variances of 2 datasets with difference sizes

In an attempt to find the mean number of hours his tutorial classmates spent per day preparing for tutorials, John collected data from 10 of his friends in the tutorial group and found that the mean ...
96 views

### dividing Mean by standard Deviation meaning

I have played around with logistic regression a little using movement data intervals that are prelabeled as either resting or active. I now found that if I divide the mean movement of the individual ...
38 views

### mean and variance of a dataset

I have a simple question. Please see the below screenshot : It is from a midterm exam from a university : https://cedar.buffalo.edu/~srihari/CSE555/exams/midterm-solution-2006.pdf My questions is how ...
4k views

### finding the mean for each of the channels (RGB) across an array of images [closed]

How can I find the mean for each of the channels (RGB) across an array of images? For example train_dataset['image'].shape is ...