1. According to Hou Jietai: the so-called centralization refers to subtracting the mean value of a variable from its expected value. For sample data, each observation value of a variable is subtracted from the sample average value of the variable, and the transformed variable is centralized
for your question, subtract the mean from each measurement.
2. Centralization is to subtract the mean and Z-score is to divide it by the standard deviation. Both of them are centralization methods.
3. Not necessarily, centralization is only for the convenience of explanation, and does not affect the regression coefficients Central treatment of regulatory effect of South Heart Network
4. 
bus line: Metro Line 2 → Metro Line 1, the whole journey is about 10.8km
1. Walk about 670m from Changsha meixihu international culture and Art Center to meixihu east station
2. Take Metro Line 2, pass 7 stops, reach Wuyi Square Station
3. Take Metro Line 1, pass 1 stop, reach peiyuanqiao station
4, walk about 1.2km, Reach POFU International Plaza
bus line: Metro Line 2 → 358, the whole journey is about 11.4km
1. Walk about 670m from Changsha meixihu international culture and Art Center to meixihu east station
2. Take Metro Line 2, pass 7 stops, and reach Wuyi Square Station
3, walk about 360m, Arrive at Huatu Ecation (taipingjiekou) station
4, take bus 358, pass 4 stops, arrive at provincial women and children station
5, walk about 200 meters to POFU International Plaza
5. Virtual currency can promote the development of some network virtual instries, such as online games, so as to promote the development of the tertiary instry and optimize the instrial structure.
6. It's more suitable for novices to start from virtual shop
because they don't need logistics, simple, suitable for novices who just learn Taobao
and can quickly earn credit
with credit, they can sell real things, so business is easy to start
I have been guiding novices to do virtual shop all the time
for those who don't know about virtual shop, you can consult me
answer Q name is contact information, hope to adopt it
7. Geomembrane is selected for fish pond excavation, which has low cost, simple construction and good anti-seepage effect. Generally, the depth is 2-3m
geomembrane manufacturers, answer for you
8. It depends on the personal situation. It's OK to dig by yourself. The cost of cement depends on the situation and the indivial decides whether or not to make porcelain tiles. The landscaping is not mentioned. The foundation of a single pool is digging and cement. Remember to figure out how to get out of the water and change the water... My family's is a single pool and hot cement. Open a hole at the bottom to drain water (usually plug it). Open a small hole in front of the top to prevent overflow. Add an oxygen pump
9. Dig the pool well, ground gas
