Counting Stocks by Industry with a Conditional Group Sum

Summary

The document answers a brief question about counting stocks within each industry group in a quantitative data expression. Its example groups records by the first-level Shenwan industry field and sums a conditional value: one for rows whose amount is nonnegative and zero otherwise. This turns a grouped sum into a count of qualifying rows for each industry.

The example is concise and gives no broader discussion, dataset, output, or validation. The count depends on the condition used: amount at or above zero is serving as a proxy for whether a stock should be included. It therefore illustrates the mechanics of conditional aggregation rather than defining a universally appropriate stock universe or providing an investment signal. Users would need to confirm that the chosen field and eligibility condition match their data and intended count.

Key ideas

• A grouped sum can be used to count records within each industry.
• The example adds one for each row with a nonnegative amount and zero otherwise.
• The grouping field represents first-level Shenwan industry classifications.
• The result depends on whether the amount condition correctly identifies eligible stocks.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.