=0:returnnp.std(x) / meanelse:returnnp.nan defvariance(x):returnnp.var(x) defskewness(x):ifnotisinstance(x, pd.Series):x = pd.Series(x)returnpd.Series.skew(x) defkurtosis(x):ifnotisinstance(x, pd.Series):x = pd.Series(x)returnpd...
4.3.3 Design a Simulation 4.4 拓展学习资源及参考目录 4.5 习题 5 线性回归模型及内生性问题 Linear Regression Models & Endogeneity Issues 5.1 Introduction 5.1.1 Motivations 5.1.2 Model Setup 5.2 OLS Estimation 5.2.1 Estimation of β 5.2.2 ...
importnumpyasnp# 从均值为50,方差为100的正态总体中,随机抽取10000个样本量为10的样本# 分别计算出10000个样本均值的均值、样本中位数的均值、样本方差的均值x, m, v = [], [], [] n =10foriinrange(1000):# loc表示均值,scale表示标准差,size表示生成随机数数量d = np.random.normal(loc=50, scal...
reset_graph() from functools import partial n_inputs = 28 * 28 n_hidden1 = 500 n_hidden2 = 500 n_hidden3 = 20 # codings n_hidden4 = n_hidden2 n_hidden5 = n_hidden1 n_outputs = n_inputs learning_rate = 0.001 initializer = tf.contrib.layers.variance_scaling_initializer() my_...
for_inrange(10):print(generate_code()) 说明:random模块的sample和choices函数都可以实现随机抽样,sample实现无放回抽样,这意味着抽样取出的字符是不重复的;choices实现有放回抽样,这意味着可能会重复选中某些字符。这两个函数的第一个参数代表抽样的总体,而参数k代表抽样的数量。
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-QsRlhoyY-1681961425704)(https://gitcode.net/apachecn/apachecn-cv-zh/-/raw/master/docs/handson-imgproc-py/img/ad15e7a2-2613-449f-a932-93a20c55063d.png)] 使用skimage.filters.rank中的maximum()和minimum()功能,实现灰度...
13 print("explained variance ratio:%s"%str(pca.explained_variance_ratio_)) 14 15 def plot_PCA(*data): 16 X,Y=data 17 pca=decomposition.PCA(n_components=2) 18 pca.fit(X) 19 X_r=pca.transform(X) 20 # print(X_r) 21 22 fig=plt.figure() ...
['Test Statistic','p-value','#Lags Used','NumberofObservations Used']) for key,value in dftest[4].items(): dfoutput['CriticalValue(%s)'%key] = value return dfoutput # 自相关和偏相关图,默认阶数为31阶 def draw_acf_pacf(ts, lags=31): f = plt.figure(facecolor='white')ax1=f....
['close']*2)ax=ma.plot(linewidth=0.8,fontsize=6)ax.set_xlabel('trade_date',fontsize=8)ax.set_ylabel('399300.SZ close from 2005-01-04 to 2019-07-04',fontsize=8)ax.set_title('Rolling mean and variance of 399300.SZ cloe from 2005-01-04 to 2019-07-04',fontsize=10)plt.show(...
代码2:在不同范围的种群树上演示pvariance()。 # Python code to demonstratepvariance()# on various range of population sets# importing statistics modulefromstatisticsimportpvariance# importing fractions module as FfromfractionsimportFractionasF# Population tree for a set of positive integerspop1 = (1...