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How to Buy the Dip

"Buy the dip" only works if you buy the right dip. Here's a rules-based way to tell a healthy pullback from a falling knife — and the exact checklist st-ox scores for any stock.

The one rule that matters

Every good dip-buy comes down to a single idea: buy a pullback inside an intact uptrend — never a falling knife. A pullback is a strong stock taking a breather; a falling knife is a weak stock on its way down, where every "dip" just gets cheaper. Same red candles on the screen, completely different outcomes. The job is to tell them apart before you buy, not after.

st-ox turns that judgement into a repeatable checklist and boils it down to one verdict per stock: Buy, Hold or Caution. Here's exactly what's behind it.

The checklist: two questions

The signal asks two separate questions — not one long vote. First, is there a real pullback? Then, is it starting to stabilise? A stock has to clear both to earn a Buy. Any indicator that can't be computed is simply dropped from its group.

Setup

Is there a genuine pullback?

RSI below 40 — momentum has cooled off, not overbought.
Price within −10% to +5% of the 200-day average — a shallow dip, not a collapse and not extended.
In the bottom 40% of its 52-week range — actually pulled back, not near the highs.
Confirmation

Is it stabilising?

RVI turning bullish — short-term momentum starting to turn up.
Relative volatility ≥ 50 — the move has real energy behind it.
On-balance volume rising — buyers are quietly stepping back in.
30-day volatility below 90-day — the panic is fading, not building.

How the verdict is decided

The two groups are scored separately, and the combination sets the verdict:

BuyAt least 2 setup signals and at least 1 confirmation — in a rising 200-day trend, and not a falling knife.
HoldThere's a real dip, but confirmation is missing or partial — a watch, not yet a buy.
CautionNo genuine pullback, or a falling knife in a downtrend — stand aside.

Notice that a big drop on its own is never enough. Without a stabilisation signal, a falling stock stays Hold or Caution — the checklist refuses to call a knife a bargain.

Two safety gates

On top of the checklist sit two hard gates that can only downgrade a verdict, never upgrade it:

Regime gate. If the 200-day moving average is falling, a Buy is capped at Hold. Dips in broken downtrends are never labelled Buy — that's where falling knives live.
Falling-knife gate. If the price is more than 10% below its 200-day average, Buy is blocked outright. And if it's below that line and the trend is falling, the verdict is floored to Caution — because that combination is not neutral.

Know your exit before you enter

A dip-buy without an exit is just hope. On any Buy or Hold, st-ox shows two downside levels so you decide your risk up front:

They measure different things — one is risk management, the other is signal validity — so they're shown nearest-to-price first. When the setup would break before the stop is hit, st-ox flags it as a "fragile setup": a marginal buy, not a comfortable one.

When it doesn't apply

The whole thesis is built on mean reversion in a trending stock, so it simply doesn't fit leveraged or inverse ETFs. Those reset daily, decay over time and are path-dependent — a low reading isn't a bargain, it's often just the maths of the product. st-ox shows no verdict for them rather than a misleading one.

Using it in st-ox

Every stock in st-ox carries a coloured dip-buy dot, and opening its detail view shows the full verdict panel: which checklist rules passed, which gate (if any) fired, the suggested stop and the setup-break level. It's the same discipline applied consistently to every ticker — including names from the GARP screener, so you can find a quality business and then time a sensible entry.

Frequently asked questions

What does buying the dip mean?
Buying a stock after its price has fallen, expecting it to recover. It only works for a healthy pullback within a rising trend — not for a stock genuinely in decline. The skill is telling those apart before you commit money.
How do you tell a buyable dip from a falling knife?
A buyable dip is a shallow pullback inside an uptrend — price still near a rising 200-day average, momentum oversold but stabilising. A falling knife is a stock in a downtrend, well below a falling 200-day average, still dropping. st-ox blocks a Buy whenever price is more than 10% below its 200-day average or that average is falling.
What indicators does the dip-buy signal use?
RSI, the Relative Vigor Index (RVI), relative volatility, on-balance volume (OBV), 30-day vs 90-day historical volatility, the 200-day moving average and 52-week range position — split into a 'setup' group (is there a real pullback?) and a 'confirmation' group (is it stabilising?), then reduced to a single Buy / Hold / Caution verdict.
Does buying the dip actually work?
It can, for quality companies in uptrends bought with a predefined stop. What loses money is buying every drop indiscriminately — especially in downtrends, where dips keep getting cheaper. Discipline and a clear exit plan matter more than the entry.
Should I buy the dip on leveraged or inverse ETFs?
No — the approach is for ordinary stocks. Leveraged and inverse ETFs reset daily and are path-dependent, so they decay and a simple mean-reversion signal would mislead. st-ox shows no verdict for them.

See the live dip-buy signal in st-ox

Open any stock and get a Buy / Hold / Caution verdict with the full checklist, the gates, and a suggested stop — across US and European markets. Free, no ads.

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For information and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Technical signals can and do fail; always manage your own risk.