Hi, welcome to the course of Statistics and Probability for DS, ML and DL. The whole playlist here you can download the code including the PPT Slides that was used in the video session.
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Tutorial 01:
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Tutorial 02:
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Tutorial 03:
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Tutorial 04:
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sample(1:10,3)
sample(1:10, replace=T)
sample(c("red","green"),10,replace=T,prob=c(0.6,0.4))
# Systematic sampling
install.packages("TeachingSampling")
library(TeachingSampling)
P <- c("Mon-8", "Tues-4", "Wed-4", "Thurs-6", "Fri-7","Sat-45","Sun-34","Mon-21", "Tues-11","Wed-34","Thurs-16","Fri-10","Sat-17","Sun-19")
systematic_sample <- S.SY(14,2)
systematic_sample
P[systematic_sample]
# Stratified Samplinglibrary(dplyr)
set.seed(1)
iris %>%
group_by (Species) %>%
sample_n(., 3)
install.packages("sampling")
library(sampling)
stratas = strata(iris, c("Species"),size = c(3,3,3), method = "srswor")
stratas
# Cluster Sampling
set.seed(1)
df <- data.frame(tour = rep(1:10, each=20),
experience = rnorm(200, mean=7, sd=1))
head(df)
#randomly choose 4 tour groups out of the 10
clusters <- sample(unique(df$tour), size=4, replace=F)
#define sample as all members who belong to one of the 4 tour groups
cluster_sample <- df[df$tour %in% clusters, ]
table(cluster_sample$tour)
Tutorial 05:
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Tutorial 06:
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Tutorial 07:
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Tutorial 08:
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Tutorial 09:
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Tutorial 10:
Here is the code of R, excel will be upload in the above link [Soon] if applicable in this tutorial, For better understanding watch the video.
# Arithmetic Mean
x <- c(3, 7, 5, 13, 20, 23, 39, 23, 40, 23, 14, 12, 56, 23)
print(mean(x))
# Geometric Mean
x <- c(1, 5, 9, 19, 25)
print(prod(x)^(1 / length(x)))
# Harmonic Mean
x <- c(1, 5, 8, 10)
print(1 / mean(1 / x))
# Median
x <- c(3, 7, 5, 13, 20, 23, 39,
23, 40, 23, 14, 12, 56, 23)
median(x)
# Mode
x <- c(3, 7, 5, 13, 20, 23, 39,
23, 40, 23, 14, 12, 56,
23, 29, 56, 37, 45, 1, 8)
# Generate frequency table
y <- table(x)
print(y)
# Mode of x
m <- names(y)[which(y == max(y))]
# Print mode
print(m)
#Range
x <- c(1,2,3,4,5)
print(max(x)-min(x))
#weighted mean
x1 <- c(9, 5, 2, 7, 3, 6, 4, 5)
w1 <- c(2, 3, 1, 5, 7, 1, 3, 7)
print(weighted.mean(x1, w1))
# RMS
x <- 1:10
print(sqrt(sum(x^2)/length(x)))
Tutorial 11:
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Tutorial 12:
Here is the code of R, excel will be upload in the above link [Soon] if applicable in this tutorial, For better understanding watch the video.
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data <- c(1,2,3,4,5)
var(data)
# Variance for Sample
#determine length of data
n <- length(data)
#calculate population variance
var(data) * (n-1)/n
# SD for Population
data <- c(1,2,3,4,5)
sd(data)
# SD for Sample
#determine length of data
n <- length(data)
sqrt((n-1)/n) * sd(data) # pop
# COV (Sample and Pop)
data <- c(88, 85, 82, 97, 67, 77, 74, 86)
#calculate CV
cv <- sd(data) / mean(data) * 100
#display CV
cv
Tutorial 13:
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Tutorial 14:
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Tutorial 15:
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Tutorial 16:
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Tutorial 17:
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Tutorial 18:
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Tutorial 19:
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Tutorial 20:
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Tutorial 21:
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Tutorial 22:
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Tutorial 23:
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Tutorial 24:
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Tutorial 25:
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Tutorial 26:
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Tutorial 27:
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Tutorial 28:
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Tutorial 29:
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Tutorial 30:
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Tutorial 31:
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Tutorial 32:
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Tutorial 33:
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Tutorial 34:
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Tutorial 35:
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For Tutorial 36 to 88 [Final video]
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