Sawl dyfyniad - er mwyn egluro'r pwnc, gobeithio:
Retail Prices Index - Frequently asked questions
Why are there several different versions of the RPI?
No single inflation measure can meet all users' needs, so in addition to
the main RPI figure (known as the 'headline rate'), the Office for National
Statistics also publishes other inflation measures based on the RPI. These
* RPIX, often called the 'underlying rate', which excludes mortgage
* RPIY, which excludes mortgage interest rates and indirect taxes (VAT,
council tax, duties vehicle excise duty, insurance tax and air passenger
* Quarterly Pensioner Indices, which use the same price data as RPI,
weighted for the typical spending of one and two-pensioner households and
excluding items such as school dinners, work place canteen meals and
housing; and the
* Tax and Price Index, which measures how much the average person's
gross income needs to change to purchase the RPI basket after allowing for
the average amount of income tax and national insurance paid on earnings.
UK Inflation History
Headline inflation = the 'all items' index;
Underlying inflation = the inflation rate excluding mortgage costs.
Consumer Price Index, Uganda May, 2002
Headline Inflation (All Items)
Underlying Inflation (Excluding Food Crops)