﻿ CrossingExtremeSignal(SeriesCollection,Double,Double,Int32,Int32,Int32) Method
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 dotnetCHARTING Namespace > FinancialEngine Class > CrossingExtremeSignal Method : CrossingExtremeSignal(SeriesCollection,Double,Double,Int32,Int32,Int32) Method

sc
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
extremeLow
This is the level at which the Stochastic is believed to indicate an oversold level. The Stochastic always lies between 0 and 100, and a suggested extreme low value to take is 20.
extremeHigh
This is the level at which the Stochastic is believed to indicate an over brought level. The Stochastic always lies between 0 and 100, and a suggested extreme high value is 80.
noOfPeriods
An integer which represents the number of periods used over which the closing price is compared.
method
Determines the methods used for the evaluation of the moving average in accordance with the following key:
1. 1 = Simple moving average
2. 2 = Geometric moving average
3. 3 = Linearly weighted moving average
4. 4 = Exponentially Weighted Moving average within smoothing fact set to be 0.5.

For further details concerning the definition of these moving averages please see the accompanying PDF documentation or the API documentation for SimpleMovingAverage.

.
lengthOfMA
The number of periods over which the moving average is considered.
This trading system combines the features of the crossing and extremum value trading systems by requiring that a signal will only be generated if the fast K Stochastic crosses the slow D Stochastic either above or below the extremal values.

# Syntax

Visual Basic (Declaration)
```Public Overloads Shared Function CrossingExtremeSignal( _
ByVal sc As SeriesCollection, _
ByVal extremeLow As Double, _
ByVal extremeHigh As Double, _
ByVal noOfPeriods As Integer, _
ByVal method As Integer, _
ByVal lengthOfMA As Integer _
) As SeriesCollection```
Visual Basic (Usage)Copy Code
``````Dim sc As SeriesCollection
Dim extremeLow As Double
Dim extremeHigh As Double
Dim noOfPeriods As Integer
Dim method As Integer
Dim lengthOfMA As Integer
Dim value As SeriesCollection

value = FinancialEngine.CrossingExtremeSignal(sc, extremeLow, extremeHigh, noOfPeriods, method, lengthOfMA)``````
C#
```public static SeriesCollection CrossingExtremeSignal(
SeriesCollection sc,
double extremeLow,
double extremeHigh,
int noOfPeriods,
int method,
int lengthOfMA
)```

#### Parameters

sc
A collection of series objects. For example, to evaluate this indicator for two series you will need to pass a series collection containing this two series.
extremeLow
This is the level at which the Stochastic is believed to indicate an oversold level. The Stochastic always lies between 0 and 100, and a suggested extreme low value to take is 20.
extremeHigh
This is the level at which the Stochastic is believed to indicate an over brought level. The Stochastic always lies between 0 and 100, and a suggested extreme high value is 80.
noOfPeriods
An integer which represents the number of periods used over which the closing price is compared.
method
Determines the methods used for the evaluation of the moving average in accordance with the following key:
1. 1 = Simple moving average
2. 2 = Geometric moving average
3. 3 = Linearly weighted moving average
4. 4 = Exponentially Weighted Moving average within smoothing fact set to be 0.5.

For further details concerning the definition of these moving averages please see the accompanying PDF documentation or the API documentation for SimpleMovingAverage.

.
lengthOfMA
The number of periods over which the moving average is considered.

#### Return Value

-1, 0, 1 - this method returns either -1, 0, 1 to indicate that either a sell, no action or buy signal was generated.

# Remarks

1. Buy Signal: When the fast K Stochastic crosses above the slow D Stochastic and this crossing takes place at a value lower than the `extremumLow`, then a buy signal is generated.
2. Sell Signal: When the fast K Stochastic crosses above the slow D Stochastic and this crossing takes place at a value higher than the `extremumHigh`, then a sell signal in generated.