from collections import namedtuple
from urllib.parse import quote as url_parse
from enum import Enum
from .graph import Graph
from .transform import Transform
class ModelOrder(Enum):
"""Represents a full model order."""
LinearSquared = -1
Interaction = -2
PartialQuadratic = -2
SpecialCubic = -3
SpecialQuartic = -4
SpecialQuintic = -5
Mean = 0
Linear = 1
Quadratic = 2
Cubic = 3
Quartic = 4
Fifth = 5
Sixth = 6
MainEffects = 11
ModelOrder_2FI = 12
ModelOrder_3FI = 13
ModelOrder_4FI = 14
ModelOrder_5FI = 15
ModelOrder_6FI = 16
ModelOrder_7FI = 17
ModelOrder_8FI = 18
ModelOrder_9FI = 19
KCV = 101
[docs]class Analysis:
"""The Analysis class holds information about an Analysis in
Stat-Ease 360. Instances of this class are typically created by
:func:`statease.client.SEClient.get_analysis`.
"""
def __init__(self, client, name):
self.client = client
self.name = name
def __str__(self):
return self.name
def __repr__(self):
return self.__str__()
[docs] def predict(self, points, coded=False, **kwargs):
""" Makes predictions at one or more points."""
payload = {
"method": "POST",
"uri": "analysis/" + url_parse(self.name, safe='') + "/predict",
"points": points,
"coded": coded,
"prediction_only": True,
}
result = self.client.send_payload(payload)
if type(result['payload']) == list:
predictions = []
for p in result['payload']:
predictions.append(p)
return predictions
return result['payload']
[docs] def get_prediction(self, points, **kwargs):
""" Retrieves a Prediction object for one or more points. """
payload = {
"method": "POST",
"uri": "analysis/" + url_parse(self.name, safe='') + "/predict",
"points": points,
"prediction_only": False,
}
if kwargs.get("population", False):
payload["population"] = kwargs["population"]
if kwargs.get("alpha", False):
payload["alpha"] = kwargs["alpha"]
if kwargs.get("n", False):
payload["n"] = kwargs["n"]
if kwargs.get("interval_bound", False):
payload["interval_bound"] = kwargs["interval_bound"]
if kwargs.get("adjust_for_poe", None) != None:
payload["adjust_for_poe"] = kwargs["adjust_for_poe"]
if kwargs.get("second_order_poe", None) != None:
payload["second_order_poe"] = kwargs["second_order_poe"]
if kwargs.get("coded", None) != None:
payload["coded"] = kwargs["coded"]
result = self.client.send_payload(payload)
if type(result['payload']) == list:
predictions = []
for p in result['payload']:
pred = namedtuple('Prediction', iter(p.keys()))(**p)
predictions.append(pred)
return predictions
return namedtuple('Prediction', iter(result['payload'].keys()))(**result['payload'])
[docs] def set_model(self, model=None, **kwargs):
""" Sets the model used in the analysis. """
payload = {
"method": "POST",
"uri": "analysis/" + url_parse(self.name, safe='') + "/model",
}
key = ''
if model:
key = 'model'
value = model
else:
if kwargs.get('model'): # e.g. model='A,B,C'
key = 'model'
if kwargs.get('process_order'):
key = 'process_order'
if kwargs.get('mixture_order'):
key = 'mixture_order'
if kwargs.get('mixture1_order'):
key = 'mixture1_order'
if kwargs.get('mixture2_order'):
key = 'mixture2_order'
value = ''
order = kwargs.get(key)
if isinstance(order, str): #e.g. model_order='linear'
value = order
elif isinstance(order, ModelOrder): #e.g. model_order=ModelOrder.Linear
value = str(order)
payload[key] = value
result = self.client.send_payload(payload)
return result['payload']
def set_transform(self, transform : Transform, **kwargs):
payload = {
"method": "POST",
"uri": "analysis/" + self.name + "/transform",
"transform": str(transform),
}
if kwargs.get("Constant") or kwargs.get("constant"):
if kwargs.get("Constant"):
constant = kwargs.get("Constant")
if kwargs.get("constant"):
constant = kwargs.get("constant")
payload["constant"] = str(constant)
if kwargs.get("Lambda") or kwargs.get("lambda"):
if kwargs.get("Lambda"):
l = kwargs.get("Lambda")
if kwargs.get("lambda"):
l = kwargs.get("lambda")
payload["lambda"] = str(l)
if kwargs.get("Lower Bound") or kwargs.get("lower bound") or kwargs.get("lower_bound"):
if kwargs.get("Lower Bound"):
lower_bound = kwargs.get("Lower Bound")
if kwargs.get("lower bound"):
lower_bound = kwargs.get("lower bound")
if kwargs.get("lower_bound"):
lower_bound = kwargs.get("lower_bound")
payload["lower_bound"] = str(lower_bound)
if kwargs.get("Upper Bound") or kwargs.get("upper bound") or kwargs.get("upper_bound"):
if kwargs.get("Upper Bound"):
upper_bound = kwargs.get("Upper Bound")
if kwargs.get("upper bound"):
upper_bound = kwargs.get("upper bound")
if kwargs.get("upper_bound"):
upper_bound = kwargs.get("upper_bound")
payload["upper_bound"] = str(upper_bound)
result = self.client.send_payload(payload)
return result['payload']
[docs] def auto_select(self, initial_model, criterion, method, alpha=None, select_by_degree=False, **kwargs):
""" Performs an auto-selection on an initial model.
:param str initial_model: A model to auto-select a subset of terms from.
:param str criterion: The criterion used to evaluate each sub-model.
Valid options are "AICc", "BIC", "pValues",
or "AdjRSquared" (case-insensitive).
:param str method: The method used to select sub-models. Valid options
are "Forward", "Backward", "Stepwise", and
"AllHierarchical" (case-insensitive).
:param float alpha: This is the alpha used to either include or exclude
terms when using the "pValues" criterion. You can
also pass `alpha_in` and/or `alpha_out` to set
those values separately (setting both only has an
effect when using the "Stepwise" method).
:param bool select_by_degree: Restricts the sub-model comparisons to
lower order terms before considering
higher order terms.
:Example:
>>> result_model = analysis.auto_select('A+B+C+AB+BC+ABC', 'BICc', 'Backward')
>>> print(result_model)
>>> "A+B+AB"
"""
payload = {
"method": "POST",
"uri": "analysis/" + url_parse(self.name, safe='') + "/autoselect",
"model": initial_model,
"criterion": criterion,
"select_method": method,
"select_by_degree": select_by_degree,
}
if kwargs.get("alpha_in", alpha):
payload["alpha_in"] = kwargs.get("alpha_in", alpha)
if kwargs.get("alpha_out", alpha):
payload["alpha_out"] = kwargs.get("alpha_out", alpha)
result = self.client.send_payload(payload)
return result['payload']['selection_log']
[docs] def go_to_node(self, node):
""" Forces the Stat-Ease 360 GUI to display a particular node. """
self.client.send_payload({
"method": "POST",
"uri": "nodes",
"node": str(node),
"analysis": self.name,
})
[docs] def analyze(self):
""" Runs the analyses on the selected model. """
return self.get_anova()
[docs] def get_anova(self):
""" Retrieves an AnovaResults object for this analysis. """
return AnovaResults(self.client, self.name)
[docs] def get_diagnostics(self):
""" Retrieves an DiagnosticsResults object for this analysis. """
return DiagnosticsResults(self.client, self.name)
def plot_residuals(self, plot_type='normal', residual_type='external'):
result = self.client.send_payload({
"method": "GET",
"uri": "analysis/" + url_parse(self.name, safe='') + "/graph/residuals?plot_type={}&residual_type={}".format(plot_type, residual_type),
})
return Graph(result['payload'])
def plot_predicted_vs_actual(self):
result = self.client.send_payload({
"method": "GET",
"uri": "analysis/" + url_parse(self.name, safe='') + "/graph/pred_vs_actual",
})
return Graph(result['payload'])
class AnovaResults:
def __init__(self, client, analysis_name):
self.client = client
self.analysis_name = analysis_name
result = self.client.send_payload({
"method": "GET",
"uri": "analysis/" + url_parse(self.analysis_name, safe='') + "/anova",
})
self.terms = []
for k, v in result['payload'].items():
if k == 'terms':
for term_dict in v:
term = namedtuple('Term', iter(term_dict.keys()))(**term_dict)
self.terms.append(term)
else:
setattr(self, k, v)
def __str__(self):
return """R2: {r2}
Adj R2: {adjr2}
Pred R2: {predr2}
PRESS: {press}
BIC: {bic}
AICc: {aicc}
Terms: {terms}""".format(
r2=self.r2,
adjr2=self.adj_r2,
predr2=self.pred_r2,
press=self.press,
bic=self.bic,
aicc=self.aicc,
terms=self.terms,
)
class DiagnosticsResults:
def __init__(self, client, analysis_name):
self.client = client
self.analysis_name = analysis_name
result = self.client.send_payload({
"method": "GET",
"uri": "analysis/" + url_parse(self.analysis_name, safe='') + "/diagnostics",
})
for k, v in result['payload'].items():
setattr(self, k, v)
def __str__(self):
return """Actual: {actual}
Predicted: {predicted}
Residuals: {residuals}
""".format(
actual=self.actual,
predicted=self.predicted,
residuals=self.residuals,
)
