股票期货突破技术分析(英文原版)-第36章

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Thinking　in　Technical　Analysis。（Bloomberg　Press；　2000）。　Tower　suggests。that　the　length　of　the　moving　average　be　measured　in　columns　rather　than　in　days　or　weeks；　allowing　moving　averages。to　be　used　effectively　on　point　and　figure　charts。　The　purpose　of　using　moving　averages。on　point　and　figure　charts。is　to　assist　in　defining　the　trend　and　therefore　in　accepting　or　rejecting　point　and　figure　buy　and　sell　signals。　Because　signals。are　more　objective　on　3…box　charts；　the　use　of　moving　averages。tends。to　be　easier；　although　there　is。no　reason　why　1…box　charts。can't　be　used　just　as　effectively。　Trend　direction　is。best　defined　by　two　moving　averages。of　different　lengths。　When　the　shorter　length　crosses　above　the　longer　length；　the　chart　is。placed　on　a　buy　alert。　The　buy　signal　occurs。on　the　next　point　and　figure　double…top　signal。　
Determining　the　best　lengths。to　use　is。a　trial　and　error；　or　optimization　process。　A　good　rule　of　thumb　is。to　use　lengths。that　are　half　those　you　use　on　line　charts；　because　in　calculating　moving　averages。on　point　and　figure；　the　average　of　each　column　is。calculated　before　the　moving　average　is。calculated。　Average　lengths。can　be　close　to　one　another　because　a　crossover　is。not　a　signal　but　rather　an　alert。　Crossovers。have　to　be　reconfirmed　by　the　point　and　figure　signal。　
Panel　A　in　Figure　8。9　is。a　2％　x　3　log　scale　chart　of　the　Walt　Disney　Co。；　with　5…and　8…column　exponential　moving　averages。　When　the　5　crosses。below　the　8；　
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Panel　B　in　Figure　8。9　is。the　same　log　scale　chart　of　Walt　Disney　but　with　a　Wilder　parabolic。SAR　with　an　acceleration　factor　of　。02。　The　parabolic　is。a　stop…and…reverse　system；　in　which　the　parabolic。line　starts　away　from　the　price　but　then　accelerates。toward　it　as。the　trend　matures。　Its。use　with　point　and　figure　is。the　same　as。that　for　moving　averages：　The　parabolic。switch　from　long　to　short　places。you　on　alert；　and　the　next　double…bottom　sell　signal　is。taken　at　point　（c）。　The　parabolic。switch　to　long　places。you　on　alert　to　take　the　next　double…top　buy　at　point　（d）。　Notice　that　immediately　after　the　buy　at　point　（d）；　the　price　retraced　but　did　not　trigger　the　parabolic。　
Another　innovation　in　point　and　figure　charts。has。been　the　use　of　Bollinger　bands；　because　they　show　a　number　of　things。that　are　not　immediately　apparent　from　the　plain　point　and　figure　chart。　These　are　trend　strength；　overbought　and　oversold　situations；　as　well　as。areas。of　low　volatility。　The　standard　Bollinger　settings。are　20　days。and　2　standard　deviations；　but　with　point　and　figure　charts。it　is。suggested　that　10　columns。and　2　standard　deviations。be　used。　
Panel　C　in　Figure　8。9　shows。a　0。5％　x　3　log　scale　of　DuPont；　with　a　set　of　10…column　Bollinger　bands。　The　strength　of　the　uptrend　is。indicated　by　the　price　remaining　above　the　moving　average　and　continually　touching　the　upper　band。　In　the　same　way；　the　strength　of　the　downtrend　is。indicated　by　the　price　continually　touching　the　lower　band。　Failure　to　cling　to　the　outer　bands。is　a　signal　that　the　trend　is。weakening　as　seen　at　the　top　when　the　column　of　Xs。fails。to　reach　the　upper　band。　Point　and　figure　shows。accumulation　or　distribution　by　congesting　sideways。　The　Bollinger　bands。emphasize　this。by　converging　into　what　Bollinger　calls　〃the　squeeze；〃　indicating　very　low　volatility。and　the　probability　of　a　sharp　move。　The　width　of　the　bands　during　the　squeeze　is。easy　to　set　on　a　log　scale　point　and　figure　chart　because　the　number　of　boxes。between　the　bands。is。the　percentage　difference。　In　the　chart　in　panel　C；　you　can　clearly　see　the　squeeze　occurring　during　the　congestion　after　the　uptrend；　where　the　bands　converge　to　four　boxes；　or　2　percent　apart。　
Sometimes；　however；　the　squeeze　is。difficult　to　see　in　3…box　reversal　charts；　so　if　you　see　a　potential　congestion　pattern　and　you're　not　sure　whether　a　squeeze　is。taking　place；　it's。worth　looking　at　it　in　a　1…box　reversal　chart。　Panel　D　is。a　1％　x　1　chart　of　Medlmmune；　Inc。　The　squeeze　of　three　boxes；　or　3　percent；　before　the　sharp　uptrend　is。easy　to　see。　It's　worth　noting　that　1…box　reversal　charts。are　clearer　and　easier　to　analyze　if　they're　drawn　using　the　point　method　of　Xs。only。　

Indicators　of　Point　and　Figure　Charts　
One　of　the　traditional　disadvantages。of　point　and　figure　charts。is。that　they　can't　be　used　with　indicators。such　as　MACD；　stochastic；　or　OBV；　and　the　like；　because　they　don't　have　a　time　scale　and　consequently　won't　match　up　with　the　indicator。　If；　however；　the　indicator　is。calculated　based　on　columns　rather　than　time；　any　indicator　can　be　used　with　a　point　and　figure　chart。　In　fact；　the　indicator　bees。an　indicator　of　the　point　and　figure　chart；　not　of　the　raw　price　data。　The　difference　is　that　the　indicator　“period”　（length）　is。


based　not　only　on　the　indicator　length　in　columns。but　also　on　the　number　of　columns。in　the　chart；　and　that　varies。according　to　the　box　size　and　reversal　used。　An　RSI　calculated　on　a　length　of　14　columns。can　produc　
analogy　is。to　changing　the　time　frame　of　your　bar　charts。to　produce　different　RSIs。based　on　hourly；　daily；　or　weekly。data。　
Indicators。do　not　work。well　on　fixed　box　size　arith　
scale　percentage　box　charts。should；　therefore；　always。be　used。　Figure　8。10　is。a　1％　x　3　log　scale　point　and　figure　chart　of　Merck。&　Co。；　with　an　MACD　




buy　and　sell　signalse　from　the　point　and　figure　chart　itself；　the　MACD　signals。put　you　
on　alert　to　look。for　the　next　point　and　figure　signal。　***************　176；177　***************　
move　to　the　July　high。　The　price　then　corrected　sharply　followed　by　the　OBV。　In　December　2005；　it　rose　sharply；　but　although　the　OBV　followed；　it　did　not　have　the　same　impel　us。　The　price　consolidated　again　and　broke　out　to　a　new　high。　Notice　that　the　OBV　did　not　do　so。　Looking　at　the　OBV　of　a　point　and　figure　chart　helps。you　to　accept　or　reject　point　and　figure　signals。because　a　good　signal　should　have　volume　behind　it。　

Remember；　when　drawing　indicators。of　point　and　figure；　the　box　size；　the　reversal；　and　the　indicator　lengths。are　all　input　parameters。　In　the　examples。above；　the　standard　indicator　lengths。have　been　used　and　the　point　and　figure　chart　parameters　have　varied。　The　charts。demonstrate　what　an　important　point　and　figure　development　this　is。　In　most　cases；　the　traditional　periods。can　be　translated　into　columns；　although　there　is　a　fine　balance　between　the　sensitivity　of　the　point　and　figure　chart　and　the　column　length　of　the　indicator。　

Market　Breadth　Indicators　
Point　and　figure　also　has。its。own　measures。of　market　breadth。　The　most　mon　calculates。on　a　day…to…day　basis。the　percentage　of　stocks。in　an　index　for　which　the　last　signal　was。a　point　and　figure　double…top　buy　signal。　The　indicator　is。called　bullish　percent　and　has。been　in　use　for　some　fifty　years。　But　there　are　other　ways。to　calculate　point　and　figure…based　market　breadth　indicators；　for　example；　the　percentage　of　stocks。for　which　the　relative　strength　chart　against　the　index　is。on　a　buy　signal；　or　the　last　column　is。a　column　of　Xs；　or　the　last　plotted　box　is。above　a　chosen　column　moving　average。　These　indicators。are　normally　plotted　as　point　and　figure　charts。but　can　be　plotted　as。line　charts　as。well。　They　act　like　overbought/oversold　oscillators。and　put　you　in　the　right　frame　of　mind　when　assessing　whether　to　accumulate　or　distribute　stocks。in　the　index。　

Flipping　Point　and　Figure　Charts　
Technical　analysts。have　been　turning　printed　charts　upside　down　for　years。to　remove　any　subconscious。bias；　but　flipping　a　point　and　figure　chart　wasn't　as。effective　because　the　columns。of　Xs。and　Os。were　the　wrong　way　when　turned　upside　down。　puters。can；　however；　flip　the　chart　and　swap　the　Xs。for　Os。and　the　Os。for　Xs。to　provide　a　perfect　point　and　figure　chart　upside　down　and　“fool〃　the　brain　into　believing　the　chart　is。the　right　way　up。　
Most　who　analyze　a　chart　have　a　bias。　Some　are　constantly　bullish　and　can't　see　tops；　others。are　bearish　and　can't　see　bottoms。　No　matter　what　bias。you　have；　flipping　the　chart　tends。to　remove　that　bias。even　though　consciously　you　know　the　chart　is。upside　down。　It's。important　that　the　flipped　chart　look。as。natural　as　possible；　so　maintaining　the　original　price　scale—even　though　the　numbers。don't　matc