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on 26-Jan-2020 (Sun)

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Flashcard 4872315211020

Tags
#DataScience
Question
In hypothesis testing, the proposed model is built on which dataset:
Answer
the training dataset.

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Flashcard 4872330415372

Tags
#DataScience #statistics
Question
Inferential analytics..
Answer

uses the probability theory to arrive at a conclusion.

Example:

Categorize height as “Tall,” “Medium,” and “Short”
Take a sample to study from the population.

z-test or t test?


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Flashcard 4872364494092

Tags
#DataScience
Question
Hypothesis Testing – Error Types
Answer

The null hypothesis corresponds to the position of the defendant: just as he is presumed to be innocent until proven guilty, so is the null hypothesis presumed to be true until the data provide convincing evidence against it.

Type I Error (α)
• Rejects the null hypothesis when it is true
• The probability of making Type I error is represented by α

(also known as a "false positive")

In terms of the courtroom example, a type I error corresponds to convicting an innocent defendant.

Type II Error (β)
• Fails to Reject the null hypothesis when it false
• The probability of making Type II error is represented by β

(also known as a "false negative" )

The alternative hypothesis corresponds to the position against the defendant.
In terms of the courtroom example, a type II error corresponds to acquitting a criminal.


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Flashcard 4872416136460

Tags
#python
Question

A tuple is:

  1. ? dimensional
  2. mutable/immutable
  3. ordered/unordered sequence of items
  4. single/mixed data types
Answer

A tuple is:

  1. 1 dimensional
  2. immutable
  3. ordered
  4. mixed data types

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Flashcard 4881236757772

Tags
#python
Question
What does the enumerate function do?
Answer

provides the index to the list, followed by the value.

example:

somelist = ['a','b','c']
for position, name in enumerate(somelist):
print position, name

will give:

0 a
1 b
2 c


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Flashcard 4881238592780

Tags
#python
Question
functions to sort
Answer
sorted, reversed

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Flashcard 4881240427788

Tags
#python
Question
What function is used to pair the data elements of lists. (Returns list of tuples.)
Answer
zip

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Flashcard 4881242262796

Tags
#python
Question
Pythons syntax for Exception Handling.
Answer

try:
except ValueError:

(check types of errors)


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Flashcard 4881244097804

Tags
#python
Question
Limitations of lists, vs numpy lists.
Answer
Cannot apply a mathematical operation over a normal list.

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Flashcard 4881245932812

Tags
#python
Question
what is ndarray.ndim used for?
Answer
It gives the number of axes (dimensions) of the array. It is also called the rank of the array.

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Flashcard 4881247767820

Tags
#python
Question
What is ndarray.shape
Answer

Returns a tuple of integers showing the size of the array in each dimension.

(4L,) -> 1 dimension array,4 items
(2L,4L) -> 2D array, 4 items each.


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Flashcard 4881249602828

Tags
#python
Question
ndarray.size ?
Answer
It gives the total number of elements in the array. It is equal to the product of the elements of the shape tuple.

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Flashcard 4881251437836

Tags
#python
Question
ndarray.dtype ?
Answer
Describes the type of the elements in the array.
sg S7 -> string, of longest length 7

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Flashcard 4881253272844

Tags
#python
Question
numpy logical condition syntax
Answer

np.logical_and(condition1,condition2)

np.logical_not(condition)


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Flashcard 4881255107852

Tags
#python
Question
numpy Accessing Array Elements.
Answer

np.array[0] eg first set

np.array[0][0]. eg first set, first element.

np.array[:,1:3] . slices all the rows, then columns 1:3 (1 to 2)


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Flashcard 4881256942860

Tags
#python
Question
Indexing with Boolean Arrays
Answer

filter = value>1

value(filter)


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Flashcard 4881258777868

Tags
#python
Question
python. view vs copy . Syntax and differences
Answer

array.view() . changes made to the new array will affect the original.

array.copy() . changes only made to the new array.


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Flashcard 4881260612876

Tags
#python
Question
Python shape manipulation functions
Answer
Flatten, Resize, Stack , Reshape, Split
Flatten: array.ravel()
Reshape: array.reshape(3,4) #3 rows, 4 columns
Resize: array.resize(2,6) #2 resizes again to 2rows, 6 columns
Split: np.hsplit(array,2) #splits array to 2
Stack: np.hstack((array1,array2,2))

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Flashcard 4881262447884

Tags
#python
Question
Linear Algebra functions. transpose, inverse, trace.
Answer

array=np.array([[1,2,3,4],[5,6,7,8]])

array.transpose()
np.linalg.inv(array) #eg 1/value
np.trace(array) #sum of diagonals left to right only


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Flashcard 4881264282892

Tags
#python
Question
A NumPy ndarray can hold single/multiple data type?
Answer
A NumPy ndarray can hold single data type = homogenous.

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Flashcard 4881298623756

Tags
#python
Question
Why Pandas ?
Answer
Easy data aggregation and transformation. Tools for reading/ writing data.
Fast and efficient data wrangling.
Intelligent and automated data alignment.
High performance merging and joining of data sets.
Functions for handling missing data.
Data standardization functions.

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Flashcard 4883816254732

Tags
#python
Question

create a panda series.

from which type of data?

Answer

import pandas as pd

someSeries = pd.Series(list/nd.array)
someSeries = pd.Series(5. , index['a','b','c'])
someSeries = pd.Series([1,2,3] , index['a','b','c']) #like a dictionary


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#anki #learning #spaced_repitition
One day in the mid-1920s, a Moscow newspaper reporter named Solomon Shereshevsky entered the laboratory of the psychologist Alexander Luria. Shereshevsky's boss at the newspaper had noticed that Shereshevsky never needed to take any notes, but somehow still remembered all he was told, and had suggested he get his memory checked by an expert.
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Augmenting Long-term Memory
emory Michael Nielsen | Y Combinator Research | July 2018 Related Resources Michael Nielsen on Twitter Michael Nielsen's project announcement mailing list cognitivemedium.com By Michael Nielsen <span>One day in the mid-1920s, a Moscow newspaper reporter named Solomon Shereshevsky entered the laboratory of the psychologist Alexander Luria. Shereshevsky's boss at the newspaper had noticed that Shereshevsky never needed to take any notes, but somehow still remembered all he was told, and had suggested he get his memory checked by an expert. Luria began testing Shereshevsky's memory. He began with simple tests, short strings of words and of numbers. Shereshevsky remembered these with ease, and so Luria gradually increased t




Flashcard 4884388515084

Question
MCB 150 Spring 2020
Answer
[default - edit me]

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