[英]statsmodels ARMA to predict out-of-sample
我想預測時間序列的返回,我首先擬合數據集但是當我預測明天的回報時它不起作用。 我的代碼是
date = datetime.datetime(2014,12,31)
todayDate = (date).strftime('%Y-%m-%d')
startdate = (date - timedelta(days = 1)).strftime('%Y-%m-%d')
enddate = (date + timedelta(days = 2)).strftime('%Y-%m-%d')
data = get_pricing([symbol],start_date= date1, end_date = todayDate, frequency='daily')
df = pd.DataFrame({"value": data.price.values.ravel()},index = data.major_axis.ravel())
result = df.pct_change().dropna()
degree = {}
for x in range(0,5):
for y in range(0,5):
try:
arma = ARMA(result, (x,y)).fit()
degree[str(x) +str(y)] = arma.aic
except:
continue
dic= sorted(degree.iteritems(), key = lambda d:d[1])
p = int(dic[0][0][0])
q = int(dic[0][0][1])
arma = ARMA(result, (p,q)).fit()
predicts = arma.predict()
exogx = np.array(range(1,4))
predictofs = arma.predict(startdate,enddate, exogx)
最后一行不起作用,它產生了一個錯誤
ValueError:如果未提供數據,則必須提供freq參數
我不明白。 有人遇到過同樣的問題嗎?
我遇到了同樣的問題,因為你的索引缺少Freq參數。 如果你打印data.index,你會看到類似的東西
DatetimeIndex(['2015-06-27','2015-06-29','2015-06-30','2015-07-01','2015-07-02','2015-07-03' ,'2015-07-04','2015-07-06','2015-07-07','2015-07-08','2015-07-09','2015-07-10',' 2015-07-11','2015-07-13','2015-07-14','2015-07-15','2015-07-16','2015-07-17','2015- 07-18','2015-07-20','2015-07-21','2015-07-22','2015-07-23','2015-07-24','2015-07- 25','2015-07-27','2015-07-28','2015-07-29','2015-07-30','2015-07-31'],dtype ='datetime64 [ns ]',name = u'Date',freq = None)]
注意'Freq = None'
你可以這樣做:
data = Series(data.values, data.index)
data = data.asfreq('D')
您也可以通過執行來硬指定頻率
data.index.freq = 'D'
如果這有點幫助,請告訴我。
如果這不起作用,您可以簡單地使用整數來進行預測,然后手動填充索引
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