stochastic13
  • Member for 5 years, 8 months
  • Last seen more than a week ago
QQ plot and $x = y$ line
6 votes

The linearity of the QQ-plot only suggests that your sample follows a normal distribution (or more specifically, it's quantile function is the probit function). The slope is determined by the standard ...

View answer
Is sensitivity or specificity a function of prevalence?
Accepted answer
5 votes

Although @Tim♦'s and @gung♦'s answers pretty much cover everything, I'll try to synthesize them both into a single one and provide further clarifications. The context of the quoted lines might mostly ...

View answer
K-Means clustering visualization & evaluation
2 votes

You can look up Silhouette widths. These are indices of cluster validity, and can help you identify which data points have a poor fit, or which clusters are less cohesive. They also give out a ...

View answer
Coding Mahalanobis and Manhattan distance with R
Accepted answer
1 votes

It is not clear what a and b are in your code. But I am assuming that either are ordered pairs, and you need a distance between these two points. Euclidean: euclideanDist <- function(a, b){ d&...

View answer
Using measurements from different machines?
Accepted answer
1 votes

Normalizing the measurements is a good thing to do. You can normalize the weight, and therefore the ratio of these two quantities will then be free of the bias of having used different machines, as ...

View answer
Calculating 95% confidence interval for survey results
0 votes

I am not very sure what exactly is asked in this scenario, but I assume you want to know how confidence interval can be calculated in such a scenario. You first take the binary (yes/no) data for each ...

View answer