statio

statio is a statistical Python libary geared towards running computations across a sliding window of values.

Download

http://pypi.python.org/pypi/statio/0.0.2

Source

https://github.com/TaylorTree/statio

Usage Model

Most statistical libraries are based on a single point in time. The -1 index of a list of values is the point in time in which the calculation is made.

statio is based on multiple points in time. Each index is considered a point in time in which the calculation is made.

• Useful for simulation application types.
• Useful for plotting or graphing applications types.

Overview

The major functions of statio:

• sum_values():

  Builds a list of Running Sums over a sliding list of values.

• sma_values():

  Builds a list of Simple Moving Averages over a sliding list of values.

• ema_values():

  Builds a list of Exponential Moving Averages over a sliding list of values.

• wwma_values():

  Builds a list of Welles Wilder Moving Averages over a sliding list of values.

• psa_values():

  Builds a list of Power Sum Averages over a sliding list of values.

• varp_values():

  Builds a list of Population Variances over a sliding list of values.

• var_values():

  Builds a list of Sample Variances over a sliding list of values.

• stdp_values():

  Builds a list of Population Standard Deviations over a sliding list of values.

• std_values():

  Builds a list of Sample Standard Deviations over a sliding list of values.

• max_values():

  Builds a list of the Maximum Values over a sliding list of values.

• min_values():

  Builds a list of the Minimum Values over a sliding list of values.

• top_values():

  Builds a list of the Top X Values over a sliding list of values.

• bottom_values():

  Builds a list of the Bottom X Values over a sliding list of values.

License

Made available under the MIT License.

Usage

Import the library:

>>> import statio

1. Build list of running sums using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> statio.sum_values(values, 3) [34, 64, 93, 93, 101, 97, 98]

2. Build list of Simple Moving Averages using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.sma_values(values, 3) >>> ["%.2f" % x for x in results] ['34.00', '32.00', '31.00', '31.00', '33.67', '32.33', '32.67']

3. Build list of Exponential Moving Averages using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.ema_values(values, 3) >>> ["%.2f" % x for x in results] ['34.00', '32.00', '31.00', '32.50', '35.25', '30.13', '32.56']

4. Build list of Welles Wilder Averages using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.wwma_values(values, 3) >>> ["%.2f" % x for x in results] ['34.00', '32.00', '31.00', '32.00', '34.00', '31.00', '32.33']

5. Build list of Population Variances using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.varp_values(values, 3) >>> ["%.2f" % x for x in results] ['0.00', '4.00', '4.67', '4.67', '13.56', '29.56', '30.89']

6. Build list of Sample Variances using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.var_values(values, 3) >>> ["%.2f" % x for x in results] ['0.00', '8.00', '7.00', '7.00', '20.33', '44.33', '46.33']

7. Build list of Population Standard Deviations using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.stdp_values(values, 3) >>> ["%.2f" % x for x in results] ['0.00', '2.00', '2.16', '2.16', '3.68', '5.44', '5.56']

8. Build list of Sample Standard Deviations using a 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.std_values(values, 3) >>> ["%.2f" % x for x in results] ['0.00', '2.83', '2.65', '2.65', '4.51', '6.66', '6.81']

9. Build list of the Maximum Value of 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> results = statio.max_values(values, 3) >>> ["%.2f" % x for x in results] ['34.00', '34.00', '34.00', '34.00', '38.00', '38.00', '38.00']

10. Build list of the Minimum Value of 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> statio.min_values(values, 3) [34, 30, 29, 29, 29, 25, 25]

11. Build list of the Top X Values of 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> statio.top_values(values, 3, 2) [[34], [30, 34], [30, 34], [30, 34], [34, 38], [34, 38], [35, 38]]

12. Build list of the Bottom X Values of 3 period window:

>>> values = [34, 30, 29, 34, 38, 25, 35] >>> statio.bottom_values(values, 3, 2) [[34], [30, 34], [29, 30], [29, 30], [29, 34], [25, 34], [25, 35]]

Roadmap

• Add median_values.
• Add recentmax_values: the index of the most recent max value.
• Add sincemax_values: the number of bars since recent max value.
• Add recentmin_values: the index of the most recent min value.
• Add sincemin_values: the number of bars since recent min value.
• Add covariance, correlation, alpha, beta computations.

For additional information, please email:

mike@taylortree.com