Answer Posted / siva reddy

When a parameter is being estimated, the estimate can be
either a single number or it can be a range of scores. When
the estimate is a single number, the estimate is called a
"point estimate"; when the estimate is a range of scores,
the estimate is called an interval estimate. Confidence
intervals are used for interval estimates.

As an example of a point estimate, assume you wanted to
estimate the mean time it takes 12-year-olds to run 100
yards. The mean running time of a random sample of
12-year-olds would be an estimate of the mean running time
for all 12-year-olds. Thus, the sample mean, M, would be a
point estimate of the population mean, μ.

Often point estimates are used as parts of other statistical
calculations. For example, a point estimate of the standard
deviation is used in the calculation of a confidence
interval for μ. Point estimates of parameters are often used
in the formulas for significance testing.

Point estimates are not usually as informative as confidence
intervals. Their importance lies in the fact that many
statistical formulas are based on them.

What is the surrogate key?

1225

---

Why filter transformation is an active one?

962

---

What is blocking transformation?

1124

---

What are the uses of etl tools?

1108

---

What is the reusable transformation?

1031

---

What is the difference between informatica 7.0 and 8.0?

988

---

My source is delimited flat file Flat file data is H|Date D1|ravi|bangalore D2|raju|pune T|4 The data will be send to target if the fallowing two conditions satisfied 1.The first row Date column is equal to SYSDATE 2.Last record second port equal to number of records. How to achieve?

1909

---

hi real timers . iam waiting for ur reply regarding ETL TESTING

2254

---

Hi, I saw one mapping implemented by my seniors . In Expression transformation they implemented following logic. That is iif(is_date(in_UC_DATINV,'YYYYMMDD'),to_date(in_UC_DATINV,'Y YYYMMDD'),'Inventory Date is either invalid or null') Inventory_Date is validated only for is_date() But not validated for notisnull() . But error says “ either invalid or null “ why? Whether is_date() also check for not isnull() ? or in this logic something is different ? Please answer me . Advance thanks

1836

---

What is dynamic cache?

1014

---

Can we create multiple integration service on single repository?

1172

---

Have you worked with/created Parameter file

1648

---

Is it possible to define a single node as a Gateway node as well as worker node?

1103

---

Enlist the tasks for which source qualifier transformation is used.

1022

---

How do you load unique records into one target table and duplicate records into a different target table?

1203

---