Assignment $1$

Find the missing data mechanisms $($MCAR$,$ MAR and MNAR$)$ for each case.

Q$1)$ Upon reviewing a time series of a stock's price, it appears that the missing values randomly occur throughout the time period. Further investigation reveals $...$ nothing. $($The true reason may be related to magnetic storms from sunspots giving computers electronic spasms.$)$

Q$2)$ Upon reviewing a time series of a stock's price, one notices that missing data tend to occur when the previous day's stock price is in the high $$50$ s$.$ Further investigation reveals that the missing values occur only when the stock price is above $$60.$

Using ch$1$a dataset to answer the following questions.

Correct your answers to $2$ d$.$p$.$

Q$3)$ Find the mean of IQ scores.

Q$4)$ Find the S$.$D$.$ of IQ scores.

Q$5)$ Find the Min $+$ Max of IQ scores.

Q$6)$ How many missing data in Job performance?

Q$7)$ What is the percentage if Job performance are missing?