How deeply does Build Python Web Apps with Streamlit cover set difference?

Explains separate filtering, percentage calculation, formatting, and display, while stopping short of broader statistical interpretation.

Set difference

As explained in Build Python Web Apps with Streamlit

A delta is the difference between a metric's value in a main period and its value in a comparison period.

A delta shows how a metric changed between a main period and a comparison period. Calculate both periods separately, then display the difference beside the main value. section 7.4.2

Comparing monthly sales

If August sales are $5M and July sales are $4M, the difference is $1M. Expressed relative to July, the delta is 20%, so the dashboard can show “$5M, up 20% from the previous period.” section 7.4.2

Implement the comparison in two steps:

Filter the comparison dataframe using the same category, gender, and other filters as the main dataframe, but use the comparison dates. section 7.4.2

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Secrets of the JavaScript Ninja, Second EditionThe set of elements in one set that are not in another set.

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Related concepts

setuses · A set is a collection of unique elements in which membership is determined by whether an element is present, not by duplicate occurrences.
set intersectioncontrasts with · Set intersection is the set of elements that belong to every one of two or more sets.
setdiffimplemented by · setdiff is a Julia function that returns the elements present in one collection but absent from one or more other collections.
st.metricused by · st.metric is a Streamlit display function that presents a labeled metric value and optionally its change from a reference value.
set operationkind of · A set operation combines, compares, or transforms sets according to the membership of their elements.
disjalternative to · disj is a Clojure function that returns a set with one or more specified elements removed.

This explainer was generated by Manning's knowledge graph from the text of Build Python Web Apps with Streamlit. The section links point to the parts of the book it draws on.