Question

What are the goals of data screening? How can you identify and remedy the following? Errors in data entry. Outliers. Missing data.

Answer #1

**Goals of
data** screening are as follows.

**Accuracy of data entry-**We have to cross check weather we have entered the data correctly or made any typing error, collection error or something like these.**Dealing with missing data-**We have to notice those data which are missed in our collected data. Based on that we have to analysis whether that number and effect are significant or not. If not significant, we can proceed for further computations. Otherwise we have to make arrangements to collect or estimate those data (all or partially as possible and as required) using different approaches.**Handling outliers-**Through overall view of the gathered data, we have to notice if there is any outlier and if possible we have to crosscheck those. If crosschecking is not possible, we have to assess the effect of those outliers in overall data and if required, we have to neglect those data for further computations.**Test of assumptions-**Earlier made assumptions like normality, linearity, uniformity, symmetricity and others are to be checked while data screening is performed.

**Errors in data
entry-**

We have to crosscheck data after entering and thus errors in data entry can be avoided (or reduced). Further observing any outlier value, we have to take special care to crosscheck whether those are entered correctly or not.

**Outliers-**

Outliers in a set of data can be identified by mere observation of the data values or through plots like scatter plot or histogram and so others. For those we have to check whether

- these occurred due to data entry error
- these are cases which are not at all part of the population
- these are the real cases which are practically different from others

For outliers we have to analysis its leverage, discrepancy and influence on the data set.

**Missing
data-**

We have to note the missing data and check whether missing data is random or not. Creating two groups one with missing data and other without missing data we have to perform t-test to examine whether there is any difference between groups. If difference is significant we have to proceed through any of following processes.

- Cases or variables related to missing data may be deleted.
- Missing values may be estimated during analysis. Replacements can be done using prior knowledge or by replacement of estimated mean (which does not change mean but reduces the standard deviation).
- Estimating using regression approach (though it is time consuming).

After reconstructing the data set we have to again perform analysis.

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future.
State what you have learned by analyzing your mistakes.
Why do we make mistakes? The old adage that
“nobody is perfect” is certainly true but we can LEARN from our
mistakes. Start to analyze your
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can only occur if you fail to reject H0. b. Type II errors can only
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making Type II errors can decrease. d. The level of significance is
the probability of making a Type II error.

can you identify any areas of structured or
unstructured data in your organization that need to be rectified,
and if so, what are they and how might you go about making this
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Identify errors and correct them of the following Java
program:
1. import java.utility.Random;
2.
3. public class Sequen
4.
5. private int stand
6. private int calc;
7.
8. public Sequen(int numStand)
9. {
10. stand = numStand;
11. skip;
12. }
13.
14. public void skip()
15. {
16. Random sit = new Random();
17. calc = sit.nextInt(stand) + 1;
18. }
19.
20. public getStand()
21. {
22. return stand;
23. }
24.
25. int getCalc()
26. {...

Identify errors and correct them of the following Java
program:
1. import java.utility.Random;
2.
3. public class Sequen
4.
5. private int stand
6. private int calc;
7.
8. public Sequen(int numStand)
9. {
10. stand =
numStand;
11. skip;
12. }
13.
14. public
void skip()
15. {
16. Random
sit = new Random();
17. calc =
sit.nextInt(stand) + 1;
18. }
19.
20. public
getStand()
21. {
22. return
stand;
23. }
24.
25. int
getCalc()
26. {
27. return
calc;
28. }
29. }
One error is already identified for you as shown below:...

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you explain to me
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When to figure out if it’s in
Cutoff
Active
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Discuss in 100–120 words.

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