large data set Flashcards by Emily Buck

what are the 5 uk locations

leuchars - Scottish cost

leeming - North Yorkshire

heathrow - Greater London

hurn - south west

Camborne - cornwall

How well did you know this?

Not at all

Perfectly

what are the 3 international locations

beijing Perth Jacksonville

How well did you know this?

Not at all

Perfectly

what time periods is the large data set measured

may to October 1987

may to October 2015

How well did you know this?

Not at all

Perfectly

what are the large data set variables

daily mean air temp

daily total rainfall

daily total sunshine

daily maximum relative humidity

daily mean windspeed and direction

daily maximum gust and direction

cloud cover

daily mean visibility

daily mean pressure

How well did you know this?

Not at all

Perfectly

daily mean air temp

celcius, between 9am and 9pm

How well did you know this?

Not at all

Perfectly

daily total rainfall

mm, for the 24 hours starting 9am, tr is less than 0.05mm

How well did you know this?

Not at all

Perfectly

daily total sunshine

hours

How well did you know this?

Not at all

Perfectly

daily maximum relative humidity

%, above 95% is mist/fog

How well did you know this?

Not at all

Perfectly

daily mean windspeed and direction

knots, described using Beaufort conversion (calm, light etc) , direction is given as cardinal (north south east west)

How well did you know this?

Not at all

Perfectly

daily maximum gust and direction

maximum instantaneous speed over 24hrs

How well did you know this?

Not at all

Perfectly

cloud cover

okras ( 1/8’s of sky covered)

How well did you know this?

Not at all

Perfectly

daily mean visibility

decametres horizontally

How well did you know this?

Not at all

Perfectly

daily mean pressure

hectopascals

How well did you know this?

Not at all

Perfectly

what is unknown for first half of may in 1987 for uk cities

daily total sunshine, mean windspeed and max gust

How well did you know this?

Not at all

Perfectly

what do the international cities contain data for

mean temp, rainfall, pressure, windspeed

How well did you know this?

Not at all

Perfectly

what are near a coast

Jacksonville, Perth, cambrone, hurn, leuchars

How well did you know this?

Not at all

Perfectly

what is in south hemisphere

Perth

How well did you know this?

Not at all

Perfectly

what variable is discrete

cloud cover

How well did you know this?

Not at all

Perfectly

what should you replace tr with

0 or 0.025

what happened 15-16 October 1987

great storm

high wind speeds

south England affected

can skew wind/gust/rainfall

how many days does lds cover

184

what is a census

collects data about all members of a population

advantage of census

fully accurate results

disadvantage of census

time consuming, expensive

what is sampling

collecting data from a subset of the population

what is simple random sampling

every group within population has an equal probability of being selected for the sample uniquely number every member and randomly select numbers using a random number generator

what is systematic sampling

choose members of a population at regular intervals using a list choose every kth member where k= (size of population)/(size of sample)

what is stratified sampling

population divided into groups and random sample from each group % taken from each group reflects that groups prevalence in population

what is quota sampling

population split into groups and members of population chosen until quota selected (not random)

what is opportunity sampling

sample formed using available members at time of study who fit criteria

pros of systematic sampling

simple, quick, suitable for large samples/populations

disadvantages for systematic sampling

sampling frame needed, bias introduced if frame not random

pros for stratified sampling

accurately reflects population structure

disadvantages for stratified sampling

population must be clearly classified into groups (strata), same as simple random within group

pros of simple random sampling

free of bias, cheap

disadvantages of simple random sampling

not suitable for large samples, sampling frame needed

pros of quota sampling

allows small sample to represent population, np sampling frame, easy, quick, cheap

disadvantages of quota sampling

non random so can introduce bias, population must be divided into groups, non responses not recorded

pros of convenience sampling

easy, inexpensive

is the binomial distribution continuous or discrete

discrete

is the normal distribution continuous or discrete

continuous

convert p(x=a) in discrete distribution to continuous

p( a-0.5 < X < a + 0.5)

convert P(x

P(X< a - 0.5)

convert P(X>a) in discrete to continuous

P(X>a+0.5)

convert P( X <= a) in discrete to continuous

p( X <= a + 0.5)

covert p(x>= a) in discrete to continuous

p(x>= a - 0.5)

if X is coded with y = ax + B, what is the mean, SD

( mean of y) - B all divided by a MEAN SD sd y divided by a